TWI861361B - 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 positive refractive power and includes a convex surface facing an object side. The second lens is with negative refractive power. The third lens is a biconvex lens with positive refractive power and includes a convex surface facing the object side and another convex surface facing an image side. The fourth lens is with negative refractive power. The fifth lens is with positive refractive power and includes a convex surface facing the image side. The sixth lens is with positive refractive power and includes a convex surface facing the image 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 lenses with refractive power are no more than eight.

Description

Imaging lens

The present invention relates to an imaging lens.

The development trend of imaging lenses today is not only towards miniaturization and high resolution, but also requires the ability to resist changes in ambient temperature to meet different application requirements. Conventional imaging lenses can no longer meet today's requirements. Another imaging lens with a new structure is needed to simultaneously meet the requirements of miniaturization, high resolution and resistance to changes in ambient temperature.

In view of this, the main purpose of the present invention is to provide an imaging lens with a shorter total length, a smaller aperture value, a higher resolution, and resistance to ambient 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 positive refractive power and includes a convex surface facing an object side. The second lens has negative refractive power. The third lens is a biconvex lens with positive refractive power and includes a convex surface facing the object side and another convex surface facing an image side. The fourth lens has negative refractive power. The fifth lens has positive refractive power and includes a convex surface facing the image side. The sixth lens has positive refractive power and includes a convex surface facing the image side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are arranged in sequence from the object side to the image side along an optical axis. The number of lenses with refractive power is not more than eight.

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

The fourth lens is glued to the fifth lens, and the sixth lens is an aspherical lens.

The imaging lens of the present invention may further include a seventh lens disposed between the sixth lens and the image side, wherein the first lens is a meniscus lens and may further include a concave surface facing the image side, the second lens includes a concave surface facing the image side, the fourth lens is a biconcave lens and includes a concave surface facing the object side and another concave surface facing the image side, the fifth lens is a biconvex lens and may further include another convex surface facing the object side, and the seventh lens is a biconcave lens having negative refractive power and includes a concave surface facing the object side and another concave surface facing the image side.

The second lens is a meniscus lens and may further include a convex surface facing the object side, and the sixth lens is a biconvex lens and may further include another convex surface facing the object side.

The lens may further include an eighth lens disposed between the seventh lens and the image side, wherein the second lens is a biconcave lens and may further include another concave surface facing the object side, the sixth lens is a meniscus lens and may further include a concave surface facing the object side, and the eighth lens is a meniscus lens having positive refractive power and including a convex surface facing the object side and a concave surface facing the image side.

The fifth lens and the eighth lens are aspherical lenses.

The imaging lens satisfies at least one of the following conditions: 2.50<TTL/f<4.75;3<TTL/BFL<6.8;-9.3<(R ₁₁ +R ₁₂ )/(R ₁₁ -R ₁₂ )<-0.2;2<|f ₄₅ /f|<6.5;-1<f ₄ /f ₅ <0;20<Vd5-Vd4<40;-7<R ₃₂ /R ₃₁ <-0.2; wherein TTL is a distance from an object side surface of a first lens to an imaging plane on the optical axis, BFL is a distance from an image side surface of a lens closest to the image side to an imaging plane on the optical axis, f is an effective focal length of the imaging lens, f ₄ is an effective focal length of a fourth lens, f ₅ is an effective focal length of a fifth lens, and f ₄₅ is a combined effective focal length of the fourth lens and the fifth lens, R ₁₁ is a curvature radius of the object side surface of the first lens, R ₁₂ is a curvature radius of the image side surface of the first lens, R ₃₁ is a curvature radius of the object side surface of the third lens, R ₃₂ is a curvature radius of the image side surface of the third lens, Vd4 is an Abbe coefficient of the fourth lens, and Vd5 is an Abbe coefficient of the fifth lens.

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

The imaging lens meets at least one of the following conditions: 1.0<Vd7/Vd6<1.5; 0.25<Nd6/Nd7<0.33; wherein Vd6 is an Abbe coefficient of the sixth lens, Vd7 is an Abbe coefficient of the seventh lens, Nd6 is a refractive index of the sixth lens, and Nd7 is a refractive index of the seventh lens.

In order to make the above-mentioned purposes, features, and advantages of the present invention more clearly understood, the following specifically cites a preferred embodiment and provides a detailed description with the accompanying drawings.

1, 2, 3, 4, 5, 6, 7, 8: Imaging lenses

L11, L21, L31, L41, L51, L61, L71, L81: First lens

L12, L22, L32, L42, L52, L62, L72, L82: Second lens

ST1, ST2, ST3, ST4, ST5, ST6, ST7, ST8: Aperture

L13, L23, L33, L43, L53, L63, L73, L83: Third lens

L14, L24, L34, L44, L54, L64, L74, L84: Fourth lens

L15, L25, L35, L45, L55, L65, L75, L85: Fifth lens

L16, L26, L36, L46, L56, L66, L76, L86: Sixth lens

L77, L87: Seventh lens

L88: The eighth lens

OF7, OF8: filter

CG1, CG2, CG3, CG4, CG5, CG6, CG7, CG8: Protective glass

IMA1, IMA2, IMA3, IMA4, IMA5, IMA6, IMA7, IMA8: Imaging surface

OA1, OA2, OA3, OA4, OA5, OA6, OA7, OA8: optical axis

S11, S21, S31, S41, S51, S61, S71, S81: first lens object side

S12, S22, S32, S42, S52, S62, S72, S82: first lens image side

S13, S23, S33, S43, S53, S63, S73, S83: Second lens object side

S14, S24, S34, S44, S54, S64, S74, S84: Second lens image side

S15, S25, S35, S45, S55, S65, S77, S87: aperture surface

S16, S26, S36, S46, S56, S66, S75, S85: Third lens object side

S17, S27, S37, S47, S57, S67, S76, S86: Third lens image side

S18, S28, S38, S48, S58, S68, S78, S88: Fourth lens object side

S19, S29, S39, S49, S59, S69, S79, S89: Fourth lens image side

S19, S29, S39, S49, S59, S69, S710, S810: Fifth lens object side

S110, S210, S310, S410, S510, S610, S711, S811: Fifth lens image side

S111, S211, S311, S411, S511, S611, S712, S812: Object side of the sixth lens

S112, S212, S312, S412, S512, S612, S713, S813: Sixth lens image side

S714, S814: seventh lens object side

S715, S815: Side view of the seventh lens

S816: Eighth lens object side

S817: Side view of the eighth lens

S716, S818: Object side of filter

S717, S819: filter image side

S113, S213, S313, S413, S513, S613, S718, S820: Protect the side of the glass

S114, S214, S314, S414, S514, S614, S719, S821: Protective glass image side

Figure 1 is a schematic diagram of the lens configuration and optical path of the first embodiment of the imaging lens of the present invention.

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

Figure 2B is a distortion diagram of the first embodiment of the imaging lens of the present invention.

Figure 2C is a spot diagram of the first embodiment of the imaging lens of the present invention.

Figure 2D is a diagram of the modulation transfer function of the first embodiment of the imaging lens of the present invention.

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

Figure 4 is a schematic diagram of the lens configuration and optical path of the third embodiment of the imaging lens of the present invention.

Figure 5A is a field curvature diagram of the third embodiment of the imaging lens of the present invention.

Figure 5B is a distortion diagram of the third embodiment of the imaging lens of the present invention.

Figure 5C is a light spot diagram of the third embodiment of the imaging lens of the present invention.

Figure 5D is a modulation transfer function diagram of the third embodiment of the imaging lens of the present invention.

Figure 6 is a schematic diagram of the lens configuration of the fourth embodiment of the imaging lens of the present invention.

Figure 7 is a schematic diagram of the lens configuration of the fifth embodiment of the imaging lens of the present invention.

Figure 8 is a schematic diagram of the lens configuration of the sixth embodiment of the imaging lens of the present invention.

Figure 9 is a schematic diagram of the lens configuration of the seventh embodiment of the imaging lens of the present invention.

Figure 10A is a field curvature diagram of the seventh embodiment of the imaging lens of the present invention.

Figure 10B is a distortion diagram of the seventh embodiment of the imaging lens of the present invention.

Figure 10C is a modulation transfer function diagram of the seventh embodiment of the imaging lens of the present invention.

Figure 11 is a schematic diagram of the lens configuration of the eighth embodiment of the imaging lens of the present invention.

Figure 12A is a field curvature diagram of the eighth embodiment of the imaging lens of the present invention.

Figure 12B is a distortion diagram of the eighth embodiment of the imaging lens of the present invention.

Figure 12C is a modulation transfer function diagram of the eighth embodiment of the imaging lens of the present invention.

The present invention provides an imaging lens, comprising: a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens; wherein the first lens has positive refractive power and includes a convex surface facing an object side; wherein the second lens has negative refractive power; wherein the third lens is a biconvex lens with positive refractive power and includes a convex surface facing the object side and Another convex surface faces an image side; wherein the fourth lens has negative refractive power; wherein the fifth lens has positive refractive power and includes a convex surface facing the image side; wherein the sixth lens has positive refractive power and includes a convex surface facing the image side; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are arranged in sequence from the object side to the image side along an optical axis. The number of lenses with refractive power is not more than eight.

Please refer to Table 1, Table 2, Table 4, Table 5, Table 7, Table 8, Table 10, Table 11, Table 13, Table 14, Table 16, Table 17, Table 19, Table 21 and Table 22 below, wherein Table 1, Table 4, Table 7, Table 10, Table 13, Table 16, Table 19 and Table 21 are respectively tables of relevant parameters of each lens of the first embodiment to the eighth embodiment of the imaging lens according to the present invention, and Table 2, Table 5, Table 8, Table 11, Table 14, Table 17 and Table 22 are respectively tables of relevant parameters of the aspherical surface of the aspherical lens in Table 1, Table 4, Table 7, Table 10, Table 13, Table 16 and Table 21.

Figures 1, 3, 4, 6, 7, 8, 9, and 11 are respectively schematic diagrams of lens configuration and optical paths of the first, second, third, fourth, fifth, sixth, seventh, and eighth embodiments of the imaging lens of the present invention, wherein the first lens L11, L21, L31, L41, L51, L61, L71, and L81 have positive refractive power and are made of glass material, and their object side surfaces S11, S21, S31, S41, S51, S61, S71, and S81 are convex surfaces, and the object side surfaces S11, S21, S31, S41, S51, S61, S71, and S81 and the image side surfaces S12, S22, S32, S42, S52, S62, S72, and S82 are all spherical surfaces.

The second lenses L12, L22, L32, L42, L52, L62, L72, and L82 have negative refractive power and are made of glass. Their image side surfaces S14, S24, S34, S44, S54, S64, S74, and S84 are concave surfaces, and the object side surfaces S13, S23, S33, S43, S53, S63, S73, and S83 and the image side surfaces S14, S24, S34, S44, S54, S64, S74, and S84 are all spherical surfaces.

The third lens L13, L23, L33, L43, L53, L63, L73, L83 is a biconvex lens with positive refractive power, made of glass material, and its object side surfaces S16, S26, S36, S46, S56, S66, S75, S85 are convex surfaces, and the image side surfaces S17, S27, S37, S47, S57, S67, S76, S86 are convex surfaces. The object side surfaces S16, S26, S36, S46, S56, S66, S75, S85 and the image side surfaces S17, S27, S37, S47, S57, S67, S76, S86 are all spherical surfaces.

The fourth lens L14, L24, L34, L44, L54, L64, L74, and L84 are biconcave lenses with negative refractive power and are made of glass. The object side surfaces S18, S28, S38, S48, S58, S68, S78, and S88 are concave surfaces, and the image side surfaces S19, S29, S39, S49, S59, S69, S79, and S89 are concave surfaces. The object side surfaces S18, S28, S38, S48, S58, S68, S78, and S88 and the image side surfaces S19, S29, S39, S49, S59, S69, S79, and S89 are all spherical surfaces.

The fifth lens L15, L25, L35, L45, L55, L65, L75, and L85 are biconvex lenses with positive refractive power and are made of glass. The object side surfaces S19, S29, S39, S49, S59, S69, S710, and S810 are convex surfaces, and the image side surfaces S110, S210, S310, S410, S510, S610, S711, and S811 are convex surfaces.

The sixth lenses L16, L26, L36, L46, L56, L66, L76, and L86 have positive refractive power and are made of glass. The image side surfaces S112, S212, S312, S412, S512, S612, S713, and S813 are convex.

In addition, imaging lenses 1, 2, 3, 4, 5, and 6 meet at least one of the following conditions (1) to (7), and imaging lenses 7 and 8 meet at least one of the following conditions (1) to (9): 2.50<TTL/f<4.75; (1)

3<TTL/BFL<6.8; (2)

-9.3<(R ₁₁ +R ₁₂ )/(R ₁₁ -R ₁₂ )<-0.2; (3)

2<｜f ₄₅ /f｜<6.5； (4)

-1<f ₄ /f ₅ <0; (5)

20<Vd5-Vd4<40; (6)

-7<R ₃₂ /R ₃₁ <-0.2; (7)

1.0<Vd7/Vd6<1.5; (8)

0.25<Nd6/Nd7<0.33; (9)

Wherein, TTL is a distance between the object side S11, S21, S31, S41, S51, S61, S71, S81 of the first lens L11, L21, L31, L41, L51, L61, L71, L81 and the imaging surface IMA1, IMA2, IMA3, IMA4, IMA5, IMA6, IMA7, IMA8 on the optical axis OA1, OA2, OA3, OA4, OA5, OA6, OA7, OA8 in the first to eighth embodiments, and BFL is a distance between the lens closest to the image side in the first to eighth embodiments. The image side surfaces S112, S212, S312, S412, S512, S612, S715, S817 of L16, L26, L36, L46, L56, L66, L77, L88 are respectively spaced from the image planes IMA1, IMA2, IMA3, IMA4, IMA5, IMA6, IMA7, IMA8 on the optical axes OA1, OA2, OA3, OA4, OA5, OA6, OA7, OA8, f is an effective focal length of the imaging lenses 1, 2, 3, 4, 5, 6, 7, 8 in the first to eighth embodiments, and f _f4 is an effective focal length of one of the fourth lenses L14, L24, L34, L44, L54, L64, L74, L84 in the first to eighth embodiments, _f5 is an effective focal length of one of the fifth lenses L15, L25, L35, L45, L55, L65, L75, L85 in the first to eighth embodiments, _f45 is a combined effective focal length of one of the fourth lenses L14, L24, L34, L44, L54, L64, L74, L84 and the fifth lenses L15, L25, L35, L45, L55, L65, L75, L85 in the first to eighth embodiments, and R ₁₁ is a radius of curvature of one of the object-side surfaces S11, S21, S31, S41, S51, S61, S71, S81 of the first lens L11, L21, L31, L41, L51, L61, L71, L81 in the first to eighth embodiments, R ₁₂ is a radius of curvature of one of the image-side surfaces S12, S22, S32, S42, S52, S62, S72, S82 of the first lens L11, L21, L31, L41, L51, L61, L71, L81 in the first to eighth embodiments, R ₃₁ is a radius of curvature of one of the object-side surfaces S16, S26, S36, S46, S56, S66, S75, S85 of the third lenses L13, L23, L33, L43, L53, L63, L73, L83 in the first to eighth embodiments, R ₃₂ is a curvature radius of one of the image side surfaces S17, S27, S37, S47, S57, S67, S76, S86 of the third lens L13, L23, L33, L43, L53, L63, L73, L83 in the first to eighth embodiments, Vd4 is an Abbe coefficient of one of the fourth lens L14, L24, L34, L44, L54, L64, L74, L84 in the first to eighth embodiments, Vd5 is a curvature radius of one of the fifth lens L 15, L25, L35, L45, L55, L65, L75, L85 are Abbe coefficients, Vd6 is an Abbe coefficient of the sixth lens L76 and L86 in the seventh to eighth embodiments, Vd7 is an Abbe coefficient of the seventh lens L77 and L87 in the seventh to eighth embodiments, Nd6 is a refractive index of the sixth lens L76 and L86 in the seventh to eighth embodiments, and Nd7 is a refractive index of the seventh lens L77 and L87 in the seventh to eighth embodiments. The imaging lenses 1, 2, 3, 4, 5, 6, 7, and 8 can effectively shorten the total length of the lens, effectively improve the resolution, effectively resist the change of ambient temperature, effectively correct aberrations, and effectively correct chromatic aberrations.

When condition (1) is met: 2.50<TTL/f<4.75, the total length of the lens can be effectively shortened.

When condition (2) is met: 3<TTL/BFL<6.8, the back focal length can be effectively increased to facilitate the assembly of the imaging lens, and space can be reserved for the installation of additional reflective elements or other application components.

When condition (3) is satisfied: -9.3<(R ₁₁ +R ₁₂ )/(R ₁₁ -R ₁₂ )<-0.2, it can be ensured that the first lens has positive refractive power and is a biconvex lens.

When condition (4) is met: 2<| _f45 /f|<6.5, chromatic aberration can be effectively reduced and image quality can be greatly improved.

When condition (5) is met: -1<f ₄ /f ₅ <0, the processing sensitivity can be effectively reduced and the image quality can be improved.

When condition (6) is met: 20<Vd5-Vd4<40, chromatic aberration can be effectively reduced and image quality can be improved.

When condition (7) is met: -7<R ₃₂ /R ₃₁ <-0.2, the sensitivity of the third lens can be effectively reduced and the image quality can be improved.

When condition (8) is met: 1.0<Vd7/Vd6<1.5, chromatic aberration can be effectively reduced and image quality can be improved.

When the condition (9) is met: 0.25<Nd6/Nd7<0.33, the image quality can be effectively improved.

When the first lens has positive refractive power and is a biconvex lens, the optical path can be effectively adjusted so that it is not prone to large bends.

When the second lens has negative refractive power and is a biconcave lens, the spherical aberration caused by the first lens being a biconvex lens can be effectively reduced to achieve the purpose of reducing aberration. In addition, the first lens has positive refractive power and the second lens has negative refractive power, which can effectively reduce the distortion of the imaging lens.

When the third lens is a biconvex lens with positive refractive power, the overall length of the lens can be effectively shortened.

When the fourth lens and the fifth lens are bonded together, the axial chromatic aberration and lateral chromatic aberration can be effectively eliminated and the imaging lens resolution can be improved.

When the sixth lens is an aspherical lens with positive refractive power, it can effectively adjust the incident angle of the main light and effectively increase the back focal length, which is convenient for imaging lens assembly.

The first embodiment of the imaging lens of the present invention is described in detail. Referring to FIG. 1 , 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 fifth lens L15, a sixth lens L16 and a protective glass CG1 along an optical axis OA1 from an object side to an image side. When imaging, the light from the object side is finally imaged on an imaging surface IMA1. According to the first to eighth paragraphs of [Implementation Method], the first lens L11 is a biconvex lens, and its image side surface S12 is a convex surface; the second lens L12 is a biconcave lens, and its object side surface S13 is a concave surface; the fifth lens L15, its object side surface S19 and image side surface S110 are both spherical surfaces; the sixth lens L16 is a biconvex lens, its object side surface S111 is a convex surface, and the object side surface S111 and image side surface S112 are both aspherical surfaces. surface; the fourth lens L14 and the fifth lens L15 are glued together; the object side surface S113 and the image side surface S114 of the protective glass CG1 are both flat surfaces; by utilizing 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, effectively improve the resolution, effectively resist environmental temperature changes, effectively correct aberrations, and effectively correct chromatic aberrations.

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

The aspheric surface concavity z of the aspheric 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 +Fh ¹⁴ +Gh ¹⁶

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

Table 2 is a table of related parameters of the aspherical surface of the aspherical lens in Table 1, where k is the cone constant and A~G are the aspherical 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). It can be seen from Table 3 that the imaging lens 1 of the first embodiment can meet the requirements of conditions (1) to (7).

In addition, the optical performance of the imaging lens 1 of the first embodiment can also meet the requirements. As shown in FIG. 2A, the field curvature of the imaging lens 1 of the first embodiment is between -0.04 mm and 0.04 mm. As shown in FIG. 2B, the distortion of the imaging lens 1 of the first embodiment is between -5% and 0%. As shown in FIG. 2C, when the image height of the imaging lens 1 of the first embodiment is 0.000 mm, the root mean square (Root Mean Square) of the light spot is 0.000 mm. Square) radius is 2.816μm, the geometrical radius of the spot is 6.097μm, when the image height is 2.184mm, the root mean square radius of the spot is 3.706μm, the geometrical radius of the spot is 10.970μm, when the image height is 3.277mm, the root mean square radius of the spot is 3 .454μm, the geometric radius of the light spot is 10.177μm, when the image height is 4.369mm, the root mean square radius of the light spot is 2.511μm, the geometric radius of the light spot is 8.086μm, when the image height is 5.461mm, the root mean square radius of the light spot is 4.233μm, the geometric radius of the light spot is 12.837μm. It can be seen from Figure 2D that the modulation conversion function value of the wide-angle lens 1 of the first embodiment is between 0.67 and 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 lens resolution can also meet the requirements, thereby obtaining better optical performance.

Please refer to FIG. 3 , the imaging lens 2 includes a first lens L21, a second lens L22, an aperture ST2, a third lens L23, a fourth lens L24, a fifth lens L25, a sixth lens L26 and a protective glass CG2 in sequence from an object side to an image side along an optical axis OA2. When imaging, the light from the object side is finally imaged on an imaging surface IMA2. According to the first to eighth paragraphs of [Implementation Method], the first lens L21 is a biconvex lens, and its image side surface S22 is a convex surface; the second lens L22 is a biconcave lens, and its object side surface S23 is a concave surface; the fifth lens L25, its object side surface S29 and image side surface S210 are both spherical surfaces; the sixth lens L26 is a biconvex lens, its object side surface S211 is a convex surface, and the object side surface S211 and image side surface S212 are both aspherical surfaces. surface; the fourth lens L24 and the fifth lens L25 are glued together; the object side surface S213 and the image side surface S214 of the protective glass CG2 are both flat; by 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 improve the resolution, effectively resist the change of ambient temperature, effectively correct the aberration, and effectively correct the chromatic aberration.

Table 4 is a table of relevant parameters of each lens of the imaging lens 2 in Figure 3.

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

Table 5 is a table of related parameters of the aspherical surface of the aspherical lens in Table 4, where k is the cone constant and A~G are the aspherical 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). It can be seen from Table 6 that the imaging lens 2 of the second embodiment can meet the requirements of conditions (1) to (7).

In addition, the optical performance of the imaging lens 2 of the second embodiment can also meet the requirements, and its field curvature diagram, distortion diagram, light spot diagram, and modulation transfer function diagram are similar to those of the imaging lens 1 of the first embodiment, so their legends are omitted.

Please refer to FIG. 4 , the imaging lens 3 includes a first lens L31, a second lens L32, an aperture ST3, a third lens L33, a fourth lens L34, a fifth lens L35, a sixth lens L36 and a protective glass CG3 along an optical axis OA3 from an object side to an image side. When imaging, the light from the object side is finally imaged on an imaging surface IMA3. According to the first to eighth paragraphs of [Implementation Method], the first lens L31 is a biconvex lens, and its image side surface S32 is a convex surface; the second lens L32 is a biconcave lens, and its object side surface S33 is a concave surface; the fifth lens L35, its object side surface S39 and image side surface S310 are both spherical surfaces; the sixth lens L36 is a biconvex lens, its object side surface S311 is a convex surface, and the object side surface S311 and image side surface S312 are both aspherical surfaces. surface; the fourth lens L34 and the fifth lens L35 are glued together; the object side surface S313 and the image side surface S314 of the protective glass CG3 are both flat; by using the above-mentioned lens, aperture ST3 and a design that satisfies at least one of the conditions (1) to (7), the imaging lens 3 can effectively shorten the total length of the lens, effectively improve the resolution, effectively resist environmental temperature changes, effectively correct aberrations, and effectively correct chromatic aberrations.

Table 7 is a table of relevant parameters of each lens of imaging lens 3 in Figure 4.

The definition of the aspheric surface concavity z of the aspheric lens in Table 7 is the same as the definition of the aspheric surface concavity z of the aspheric lens in Table 1 of the first embodiment, and will not be elaborated here.

Table 8 is a table of related parameters of the aspherical surface of the aspherical lens in Table 7, where k is the cone constant and A~G are the aspherical coefficients.

Table 9 shows the relevant parameter values of the imaging lens 3 of the third embodiment and the calculated values of the corresponding conditions (1) to (7). It can be seen from Table 9 that the imaging lens 3 of the third embodiment can meet the requirements of conditions (1) to (7).

In addition, the optical performance of the imaging lens 3 of the third embodiment can also meet the requirements. As can be seen from FIG. 5A, the field curvature of the imaging lens 3 of the third embodiment is between -0.04mm and 0.05mm. As can be seen from FIG. 5B, the distortion of the imaging lens 3 of the third embodiment is between -5% and 0%. As can be seen from FIG. 5C, when the image height of the imaging lens 3 of the third embodiment is 0.000mm, the root mean square radius of the light spot is 1.489μm, and the geometric radius of the light spot is 3.613μm. When the image height is 2.184mm, the root mean square radius of the light spot is 2.292μm, and the geometric radius of the light spot is 6.685μm. When the image height is 3.277mm, The root mean square radius of the light spot is 2.264μm, and the geometric radius of the light spot is 6.491μm. When the image height is 4.369mm, the root mean square radius of the light spot is 2.263μm, and the geometric radius of the light spot is 6.113μm. When the image height is 5.461mm, the root mean square radius of the light spot is 4.647μm, and the geometric radius of the light spot is 14.046μm. It can be seen from Figure 5D that the modulation transfer function value of the imaging lens 3 of the third embodiment is between 0.68 and 1.0.

It is obvious that the field curvature and distortion of the imaging lens 3 of the third embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.

Please refer to FIG. 6 , the imaging lens 4 includes a first lens L41, a second lens L42, an aperture ST4, a third lens L43, a fourth lens L44, a fifth lens L45, a sixth lens L46 and a protective glass CG4 in sequence from an object side to an image side along an optical axis OA4. When imaging, the light from the object side is finally imaged on an imaging surface IMA4. According to the first to eighth paragraphs of [Implementation Method], the first lens L41 is a biconvex lens, and its image side surface S42 is a convex surface; the second lens L42 is a biconcave lens, and its object side surface S43 is a concave surface; the fifth lens L45, its object side surface S49 and image side surface S410 are both spherical surfaces; the sixth lens L46 is a biconvex lens, its object side surface S411 is a convex surface, and the object side surface S411 and image side surface S412 are both aspherical surfaces. surface; the fourth lens L44 and the fifth lens L45 are glued together; the object side surface S413 and the image side surface S414 of the protective glass CG4 are both flat; by using the above-mentioned lens, aperture ST4 and a design that satisfies at least one of the conditions (1) to (7), the imaging lens 4 can effectively shorten the total length of the lens, effectively improve the resolution, effectively resist the change of ambient temperature, effectively correct the aberration, and effectively correct the chromatic aberration.

Table 10 is a table of relevant parameters of each lens of the imaging lens 4 in Figure 6.

The definition of the aspheric surface concavity z of the aspheric lens in Table 10 is the same as the definition of the aspheric surface concavity z of the aspheric lens in Table 1 of the first embodiment, and will not be elaborated here.

Table 11 is a table of related parameters of the aspherical surface of the aspherical lens in Table 10, where k is the cone constant and A~G are the aspherical coefficients.

Table 12 shows the relevant parameter values of the imaging lens 4 of the fourth embodiment and the calculated values of the corresponding conditions (1) to (7). It can be seen from Table 12 that the imaging lens 4 of the fourth embodiment can meet the requirements of conditions (1) to (7).

In addition, the optical performance of the imaging lens 4 of the fourth embodiment can also meet the requirements, and its field curvature diagram, distortion diagram, light spot diagram, and modulation transfer function diagram are similar to those of the imaging lens 1 of the first embodiment, so its legend is omitted.

Please refer to FIG. 7 , the imaging lens 5 includes a first lens L51, a second lens L52, an aperture ST5, a third lens L53, a fourth lens L54, a fifth lens L55, a sixth lens L56 and a protective glass CG5 in sequence from an object side to an image side along an optical axis OA5. When imaging, the light from the object side is finally imaged on an imaging surface IMA5. According to the first to eighth paragraphs of [Implementation Method], the first lens L51 is a biconvex lens, and its image side surface S52 is a convex surface; the second lens L52 is a biconcave lens, and its object side surface S53 is a concave surface; the fifth lens L55, its object side surface S59 and image side surface S510 are both spherical surfaces; the sixth lens L56 is a biconvex lens, its object side surface S511 is a convex surface, and the object side surface S511 and image side surface S512 are both aspherical surfaces. surface; the fourth lens L54 and the fifth lens L55 are glued together; the object side surface S513 and the image side surface S514 of the protective glass CG5 are both flat; by using the above-mentioned lens, aperture ST5 and a design that satisfies at least one of the conditions (1) to (7), the imaging lens 5 can effectively shorten the total length of the lens, effectively improve the resolution, effectively resist the change of ambient temperature, effectively correct the aberration, and effectively correct the chromatic aberration.

Table 13 is a table of relevant parameters of each lens of the imaging lens 5 in Figure 7.

The definition of the aspheric surface concavity z of the aspheric lens in Table 13 is the same as the definition of the aspheric surface concavity z of the aspheric lens in Table 1 of the first embodiment, and will not be elaborated here.

Table 14 is a table of related parameters of the aspherical surface of the aspherical lens in Table 13, where k is the cone constant and A~G are the aspherical coefficients.

Table 15 shows the relevant parameter values of the imaging lens 5 of the fifth embodiment and the calculated values of the corresponding conditions (1) to (7). It can be seen from Table 15 that the imaging lens 5 of the fifth embodiment can meet the requirements of conditions (1) to (7).

In addition, the optical performance of the imaging lens 5 of the fifth embodiment can also meet the requirements, and its field curvature diagram, distortion diagram, light spot diagram, and modulation transfer function diagram are similar to those of the imaging lens 1 of the first embodiment, so its legend is omitted.

Please refer to FIG. 8 , the imaging lens 6 includes a first lens L61, a second lens L62, an aperture ST6, a third lens L63, a fourth lens L64, a fifth lens L65, a sixth lens L66 and a protective glass CG6 in sequence from an object side to an image side along an optical axis OA6. When imaging, the light from the object side is finally imaged on an imaging surface IMA6. According to the first to eighth paragraphs of [Implementation Method], the first lens L61 is a biconvex lens, and its image side surface S62 is a convex surface; the second lens L62 is a biconcave lens, and its object side surface S63 is a concave surface; the fifth lens L65, its object side surface S69 and image side surface S610 are both spherical surfaces; the sixth lens L66 is a biconvex lens, its object side surface S611 is a convex surface, and the object side surface S611 and image side surface S612 are both aspherical surfaces. surface; the fourth lens L64 and the fifth lens L65 are glued together; the object side surface S613 and the image side surface S614 of the protective glass CG6 are both flat; by using the above-mentioned lens, aperture ST6 and a design that satisfies at least one of the conditions (1) to (7), the imaging lens 6 can effectively shorten the total length of the lens, effectively improve the resolution, effectively resist the change of ambient temperature, effectively correct the aberration, and effectively correct the chromatic aberration.

Table 16 is a table of relevant parameters of each lens of the imaging lens 6 in Figure 8.

The definition of the aspheric surface concavity z of the aspheric lens in Table 16 is the same as the definition of the aspheric surface concavity z of the aspheric lens in Table 1 of the first embodiment, and will not be elaborated here.

Table 17 is a table of related parameters of the aspherical surface of the aspherical lens in Table 16, where k is the cone constant and A~G are the aspherical coefficients.

Table 18 shows the relevant parameter values of the imaging lens 6 of the sixth embodiment and the calculated values of the corresponding conditions (1) to (7). It can be seen from Table 18 that the imaging lens 6 of the sixth embodiment can meet the requirements of conditions (1) to (7).

In addition, the optical performance of the imaging lens 6 of the sixth embodiment can also meet the requirements, and its field curvature diagram, distortion diagram, light spot diagram, and modulation transfer function diagram are similar to those of the imaging lens 1 of the first embodiment, so its legend is omitted.

Please refer to FIG. 9 , the imaging lens 7 includes a first lens L71, a second lens L72, a third lens L73, an aperture ST7, a fourth lens L74, a fifth lens L75, a sixth lens L76, a seventh lens L77, a filter OF7 and a protective glass CG7 along an optical axis OA7 from an object side to an image side. When imaging, the light from the object side is finally imaged on an imaging surface IMA7. According to the first to eighth paragraphs of [Implementation Method], among them: The first lens L71 is a meniscus lens, and its image side surface S72 is a concave surface; the second lens L72 is a meniscus lens, and its object side surface S73 is a convex surface; the fifth lens L75, its object side surface S710 and image side surface S711 are both spherical surfaces; the sixth lens L76 is a biconvex lens, its object side surface S712 is a convex surface, and the object side surface S712 and image side surface S713 are both spherical surfaces; the seventh lens L77 is a biconcave lens with negative refractive power, made of glass material, and its object side surface S714 is Concave surface, image side surface S715 is concave, object side surface S714 and image side surface S715 are both spherical surfaces; the object side surface S716 and image side surface S717 of filter OF7 are both planes; the object side surface S718 and image side surface S719 of protective glass CG7 are both planes; by using the above-mentioned lens, aperture ST7 and the design that satisfies at least one of conditions (1) to (9), the imaging lens 7 can effectively shorten the total length of the lens, effectively improve the resolution, effectively resist the change of ambient temperature, effectively correct the aberration, and effectively correct the chromatic aberration.

Table 19 is a table of relevant parameters of each lens of imaging lens 7 in Figure 9.

Table 20 shows the relevant parameter values of the imaging lens 7 of the seventh embodiment and the calculated values of the corresponding conditions (1) to (9). It can be seen from Table 20 that the imaging lens 7 of the seventh embodiment can meet the requirements of conditions (1) to (9).

In addition, the optical performance of the imaging lens 7 of the seventh embodiment can also meet the requirements. As shown in Figure 10A, the field curvature of the imaging lens 7 of the seventh embodiment is between -0.03mm and 0.04mm. As shown in Figure 10B, the distortion of the imaging lens 7 of the seventh embodiment is between -12% and 0%. As shown in Figure 10C, the modulation transfer function value of the imaging lens 7 of the seventh embodiment is between 0.14 and 1.0.

It is obvious that the field curvature and distortion of the imaging lens 7 of the seventh embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.

Please refer to FIG. 11 , the imaging lens 8 includes a first lens L81, a second lens L82, a third lens L83, an aperture ST8, a fourth lens L84, a fifth lens L85, a sixth lens L86, a seventh lens L87, an eighth lens L88, a filter OF8 and a protective glass CG8 in order from an object side to an image side along an optical axis OA8. When imaging, the light from the object side is finally imaged on an imaging surface IMA8. According to the first to eighth paragraphs of [Implementation Method], the first lens L81 is a meniscus lens, and its image side surface S82 is a concave surface; the second lens L82 is a biconcave lens, and its object side surface S83 is a concave surface; the fifth lens L85, its object side surface S810 and image side surface S811 are both aspherical surfaces; the sixth lens L86 is a meniscus lens. The seventh lens L87 is a double concave lens with negative refractive power, made of glass material, and its object side surface S814 is concave, and its image side surface S815 is concave, and the object side surface S814 and the image side surface S815 are both spherical surfaces; the The eight-lens L88 is a meniscus lens with positive refractive power, made of glass, with its object side surface S816 being convex and its image side surface S817 being concave. Both the object side surface S816 and the image side surface S817 are aspherical surfaces; the object side surface S818 and the image side surface S819 of the filter OF8 are both planes; the object side surface S820 and the image side surface S821 of the protective glass CG8 are both planes; by using the above-mentioned lens, aperture ST8 and the design that satisfies at least one of the conditions (1) to (9), the imaging lens 8 can effectively shorten the total length of the lens, effectively improve the resolution, effectively resist the change of ambient temperature, effectively correct the aberration, and effectively correct the chromatic aberration.

Table 21 is a table of relevant parameters of each lens of the imaging lens 8 in Figure 11.

The definition of the aspheric surface concavity z of the aspheric lens in Table 21 is the same as the definition of the aspheric surface concavity z of the aspheric lens in Table 1 of the first embodiment, and will not be elaborated here.

Table 22 is a table of related parameters of the aspherical surface of the aspherical lens in Table 21, where k is the cone constant and A~G are the aspherical coefficients.

Table 23 shows the relevant parameter values of the imaging lens 8 of the eighth embodiment and the calculated values of the corresponding conditions (1) to (9). It can be seen from Table 23 that the imaging lens 8 of the eighth embodiment can meet the requirements of conditions (1) to (9).

In addition, the optical performance of the imaging lens 8 of the eighth embodiment can also meet the requirements. As shown in Figure 12A, the field curvature of the imaging lens 8 of the eighth embodiment is between -0.035mm and 0.035mm. As shown in Figure 12B, the distortion of the imaging lens 8 of the eighth embodiment is between -10% and 0%. As shown in Figure 12C, the modulation transfer function value of the imaging lens 8 of the eighth embodiment is between 0.21 and 1.0.

It is obvious that the field curvature and distortion of the imaging lens 8 of the eighth embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.

Although the present invention has been disclosed in the form of implementation as above, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of the attached patent application.

1: Imaging lens

L11: First lens

L12: Second lens

ST1: Aperture

L13: Third lens

L14: The fourth lens

L15: Fifth lens

L16: Sixth lens

CG1: Protective glass

IMA1: Imaging surface

OA1: optical axis

S11: Object side of the first lens

S12: Side view of the first lens

S13: Second lens object side

S14: Second lens image side

S15: Aperture surface

S16: Third lens object side

S17: Third lens image side

S18: Fourth lens object side

S19: Fourth lens image side

S19: Fifth lens object side

S110: Fifth lens image side

S111: Object side of the sixth lens

S112: Sixth lens image side

S113: Protect the side of the glass

S114: Protective glass image side

Claims (10)

An imaging lens comprises: a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens; wherein the first lens has positive refractive power and comprises a convex surface facing an object side; wherein the second lens has negative refractive power; wherein the third lens is a biconvex lens with positive refractive power and comprises a convex surface facing the object side and another convex surface facing an image side; wherein the fourth lens has negative refractive power; wherein the fifth lens has positive refractive power; wherein the sixth lens has positive refractive power and comprises a convex surface facing the image side; wherein the number of lenses with refractive power is not more than eight; wherein the imaging lens satisfies at least one of the following conditions: 2.50<TTL/f<4.75;2<|f ₄₅ /f｜<6.5;20<Vd5-Vd4<40; wherein TTL is a distance from an object side of the first lens to an imaging plane on an optical axis, f is an effective focal length of the imaging lens, _f45 is a combined effective focal length of the fourth lens and the fifth lens, Vd4 is an Abbe coefficient of the fourth lens, and Vd5 is an Abbe coefficient of the fifth lens; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are arranged in sequence from the object side to the image side along the optical axis. An imaging lens comprises: a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens; wherein the first lens has positive refractive power and comprises a convex surface facing an object side and another convex surface facing an image side; wherein the second lens has negative refractive power; wherein the third lens is a biconvex lens having positive refractive power and comprises a convex surface facing the object side and another convex surface facing the image side. The fourth lens has a negative refractive power; the fifth lens has a positive refractive power; the sixth lens has a positive refractive power and includes a convex surface facing the image side; the number of lenses with refractive power is no more than eight; the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are arranged in sequence from the object side to the image side along an optical axis. As described in any one of claim items 1 to 2 of the patent application scope, the fourth lens is glued to the fifth lens, and the sixth lens is an aspherical lens. The imaging lens as described in item 1 of the patent application further includes a seventh lens disposed between the sixth lens and the image side, wherein: the first lens is a meniscus lens and further includes a concave surface facing the image side; and the seventh lens is a biconcave lens having negative refractive power and includes a concave surface facing the object side and another concave surface facing the image side. The imaging lens as described in item 4 of the patent application, wherein: The second lens is a meniscus lens and further includes a convex surface facing the object side; and the sixth lens is a biconvex lens and further includes another convex surface facing the object side. The imaging lens as described in item 4 of the patent application further includes an eighth lens disposed between the seventh lens and the image side, wherein: the sixth lens is a meniscus lens and further includes a concave surface facing the object side; and the eighth lens is a meniscus lens having positive refractive power and includes a convex surface facing the object side and a concave surface facing the image side. An imaging lens as described in item 1, item 2, item 4, item 5 or item 6 of the patent application, wherein: the second lens includes a concave surface facing the image side; the fourth lens is a biconcave lens and includes a concave surface facing the object side and another concave surface facing the image side; and the fifth lens is a biconvex lens and includes a convex surface facing the object side and another convex surface facing the image side. An imaging lens as described in item 1, item 2, item 4, item 5 or item 6 of the patent application, wherein the imaging lens satisfies at least one of the following conditions: 3<TTL/BFL<6.8;-9.3<(R ₁₁ +R ₁₂ )/(R ₁₁ -R ₁₂ )<-0.2;-1<f ₄ /f ₅ <0;-7<R ₃₂ /R ₃₁ <-0.2; wherein TTL is a distance from an object side surface of the first lens to an imaging plane on the optical axis, BFL is a distance from an image side surface of the lens closest to the image side to the imaging plane on the optical axis, f ₄ is an effective focal length of the fourth lens, f ₅ is an effective focal length of the fifth lens, R _R11 is a curvature radius of the object side surface of the first lens, _R12 is a curvature radius of an image side surface of the first lens, _R31 is a curvature radius of an object side surface of the third lens, and _R32 is a curvature radius of an image side surface of the third lens. The imaging lens as described in item 1, item 2, item 4 or item 5 of the patent application scope further includes an aperture disposed between the second lens and the fourth lens, wherein the sixth lens is a biconvex lens and further includes another convex surface facing the object side. An imaging lens as described in any one of claims 4 to 6 of the patent application, wherein the imaging lens satisfies at least one of the following conditions: 1.0<Vd7/Vd6<1.5; 0.25<Nd6-Nd7<0.33; wherein Vd6 is an Abbe coefficient of the sixth lens, Vd7 is an Abbe coefficient of the seventh lens, Nd6 is a refractive index of the sixth lens, and Nd7 is a refractive index of the seventh lens.

Images