TWI815459B - Lens assembly - Google Patents

Abstract

A lens assembly includes a first lens group, a second lens group, and a third lens group. The first lens group is with positive refractive power and includes at least four lenses, wherein the lenses are arranged in order from an object side to an image side along an optical axis, the lens closest to the object side among the lenses includes a convex surface facing the object side, and the lens closest to the image side among the lenses includes a convex surface facing the image side. The second lens group is with negative refractive power and includes a 2-1 lens and a 2-2 lens, wherein the 2-2 lens includes a convex surface facing the image side. The third lens group is with negative refractive power and includes a 3-1 lens, wherein the 3-1 lens is a meniscus lens with negative refractive power. The first lens group, the second lens group, and the third lens group are arranged in order from the object side to the image side along the optical axis.

Description

Imaging lens(68)

The invention relates to an imaging lens.

The total length of the conventional long-focal-length imaging lens is usually longer, and as the focal length becomes longer, the impact of jitter on the image quality will become greater and greater, so an anti-shake function is needed to effectively eliminate jitter. Improve image quality. Conventional imaging lenses with long focal lengths usually do not have anti-shake function and are no longer able to meet today's needs. An imaging lens with a new architecture is needed to simultaneously meet the needs of long focal length, miniaturization, high resolution, and anti-shake. .

In view of this, the main purpose of the present invention is to provide an imaging lens with a short overall length, high resolution, and anti-shake function, but still has good optical performance.

The imaging lens of the present invention includes a first lens group, a second lens group and a third lens group. The first lens group has positive refractive power. The first lens group includes at least four lenses. The lenses are arranged sequentially along an optical axis from an object side to an image side, and the lenses are closest to the object. The lens on the side includes a convex surface facing the object side, and the lens closest to the image side includes a convex surface facing the image side. The second lens group has negative refractive power. The second lens group includes a 2-1 lens and a 2-2 lens, wherein the 2-2 lens includes a convex surface facing the image side. The third The lens group has negative refractive power. The third lens group includes a 3-1 lens. The 3-1 lens is a meniscus lens with negative refractive power. The first lens group, the second lens group and the third lens group are arranged in sequence from the object side to the image side along the optical axis. The 2-1 lens and the 2-2 lens are arranged in sequence from the object side to the image side along the optical axis.

The second lens group can move along the direction perpendicular to the optical axis to achieve optical anti-shake, and the third lens group can move along the optical axis direction to focus the imaging lens.

Wherein at least three lenses in the first lens group have positive refractive power, the refractive power of the 2-1 lens and the refractive power of the 2-2 lens are opposite, and when the first lens group includes two meniscus lenses , then the second lens group includes a meniscus lens.

The first lens group includes a 1-1 lens, a 1-2 lens, a 1-3 lens, a 1-4 lens and a 1-5 lens, the 1-1 lens, the 1-2 lens, the The 1-3 lens, the 1-4 lens and the 1-5 lens are arranged in sequence from the object side to the image side along the optical axis, the 1-4 lens has negative refractive power, and the 2-1 lens object side The concave and convex surface of lens 1-3 is different from the concave and convex surface of the image side of lens 1-3. When the surface of the object side of lens 2-1 is convex, then the surface of the image side of lens 1-3 is concave. When 2-1 When the surface shape of the object side of the lens is concave, the surface shape of the image side of lens 1-3 is convex.

The first lens group includes a 1-1 lens, a 1-2 lens, a 1-3 lens, a 1-4 lens and a 1-5 lens. The 3-1 lens includes a convex surface facing the object side and A concave surface faces the image side, and the 1-1 lens, the 1-2 lens, the 1-3 lens, the 1-4 lens and the 1-5 lens are along the optical axis from the object side to the image side Arrange in order.

The 1-3 lens has positive refractive power, and the 2-1 lens has negative refractive power, When the 1-3 lens is a biconvex lens and includes a convex surface facing the object side and another convex surface facing the image side, then the 2-1 lens is a biconcave lens and includes a concave surface facing the object side and another concave surface facing the image side. On the image side, and when the 1-3 lens is a meniscus lens, the 2-1 lens is also a meniscus lens.

When the 1-3 lens is a meniscus lens, the 1-3 lens includes a convex surface facing the object side and a concave surface facing the image side, and when the 2-1 lens is a meniscus lens, then The 2-1 lens includes a convex surface facing the object side and a concave surface facing the image side.

The 1-1 lens is a biconvex lens with positive refractive power and includes a convex surface facing the object side and another convex surface facing the image side. The 1-2 lens is a biconcave lens with negative refractive power and includes a concave surface facing the object side. And another concave surface faces the image side. The 1-4 lens is a meniscus lens with negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side. The 1-5 lens is a biconvex lens with positive refractive power. , and includes a convex surface facing the object side and another convex surface facing the image side, and the 2-2 lens is a biconvex lens with positive refractive power, and further includes a convex surface facing the object side.

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

fG1/f

0.45；-1.2

fG2/f

-0.85；-0.5

fG3/f

-0.4；Vd4>Vd5；-0.92

(1-β)×βr

-0.7；2

f/BFL

4；2.8

TTL/LG1L

3.9；其中，fG1為該第一透鏡群之一有效焦距，fG2為該第二透鏡群之一有效焦距，fG3為該第三透鏡群之一有效焦距，f為該成像鏡頭之一有效焦距，Vd4為該1-4透鏡之一阿貝係數，Vd5為該1-5透鏡之一阿貝係數，β為該第二透鏡群之一放大率，βr為該第三透鏡群之一放大率，BFL為該第三透鏡群中最靠近該像側之一透鏡之 一像側面至一成像面沿著該光軸之一間距，TTL為該第一透鏡群中最靠近該物側之一透鏡之一物側面至該成像面沿著該光軸之一間距，LG1L為該第一透鏡群中最靠近該物側之該透鏡之該物側面至該第一透鏡群中最靠近該像側之一透鏡之一像側面沿著該光軸之一間距。 The imaging lens meets at least one of the following conditions: 0.35

fG1/f

0.45;-1.2

fG2/f

-0.85;-0.5

fG3/f

-0.4; Vd4>Vd5; -0.92

(1-β)×βr

-0.7;2

f/BFL

4;2.8

TTL/LG1L

3.9; Among them, fG1 is the effective focal length of one of the first lens group, fG2 is the effective focal length of one of the second lens group, fG3 is the effective focal length of one of the third lens group, f is the effective focal length of one of the imaging lenses, Vd4 is the Abbe coefficient of one of the 1-4 lenses, Vd5 is the Abbe coefficient of one of the 1-5 lenses, β is the magnification of one of the second lens group, βr is the magnification of one of the third lens group, BFL is the distance between the image side of the lens closest to the image side in the third lens group and an imaging plane along the optical axis, and TTL is the distance between the image side of the lens closest to the object side in the first lens group. The distance between an object side and the imaging surface along the optical axis, LG1L is one of the object side of the lens closest to the object side in the first lens group to the closest to the image side in the first lens group One of the image sides of the lens is spaced along the optical axis.

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

1, 2, 3: Imaging lens

LG12, LG22, LG32: Second lens group

IMA1, IMA2, IMA3: imaging surface

L11, L21, L31:1-1 lens

L13, L23, L33:1-3 lens

L15, L25, L35:1-5 lens

L17, L27, L37:2-2 lens

ST1, ST2, ST3: Aperture

LG11, LG21, LG31: First lens group

LG13, LG23, LG33: Third lens group

OA1, OA2, OA3: optical axis

L12, L22, L32:1-2 lens

L14, L24, L34:1-4 lens

L16, L26, L36:2-1 lens

L18, L28, L38:3-1 lens

S11, S21, S31:1-1 lens object side

S12, S22, S32:1-1 lens image side

S13, S23, S33:1-2 lens image side

S15, S25, S35: 1-3 lens image side

S17, S27, S37: 1-4 lens image side

S19, S29, S39: 1-5 lens image side

S111, S211, S311:2-1 lens object side

S113, S213, S313: 2-2 lens object side

S115, S215, S315:3-1 lens object side

S12, S22, S32:1-2 lens object side

S14, S24, S34: 1-3 lens object side

S16, S26, S36: 1-4 lens object side

S18, S28, S38: 1-5 lens object side

S110, S210, S310: Aperture surface

S112, S212, S312: 2-1 lens image side

S114, S214, S314: 2-2 lens image side

S116, S216, S316: 3-2 lens image side

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

Figure 2 is a longitudinal aberration (Longitudinal Aberration) diagram of the first preferred embodiment of the imaging lens of the present invention.

Figure 3 is a Field Curvature diagram of the first preferred embodiment of the imaging lens of the present invention.

Figure 4 is a distortion diagram of the first preferred embodiment of the imaging lens of the present invention.

Figure 5 is a lateral color diagram of the first preferred embodiment of the imaging lens of the present invention.

Figure 6 is a Transverse Ray Fan Plot of the first preferred embodiment of the imaging lens of the present invention.

Figure 7 is a schematic diagram of the lens configuration and optical path of the second preferred embodiment of the imaging lens of the present invention.

Figure 8 is a longitudinal aberration diagram of the second preferred embodiment of the imaging lens of the present invention.

Figure 9 is a field curvature diagram of the second preferred embodiment of the imaging lens of the present invention.

Figure 10 is a distortion diagram of the second preferred embodiment of the imaging lens of the present invention.

Figure 11 is a lateral chromatic aberration diagram of the second preferred embodiment of the imaging lens of the present invention.

Figure 12 is a transverse light fan diagram of the second preferred embodiment of the imaging lens of the present invention.

Figure 13 is a schematic diagram of the lens configuration and optical path of the third preferred embodiment of the imaging lens of the present invention.

Figure 14 is a longitudinal aberration diagram of the third preferred embodiment of the imaging lens of the present invention.

Figure 15 is a field curvature diagram of the third preferred embodiment of the imaging lens of the present invention.

Figure 16 is a distortion diagram of the third preferred embodiment of the imaging lens of the present invention.

Figure 17 is a lateral chromatic aberration diagram of the third preferred embodiment of the imaging lens of the present invention.

Figure 18 is a transverse light fan diagram of the third embodiment of the imaging lens of the present invention.

The present invention provides an imaging lens. The imaging lens of the first embodiment includes: a first lens group. The first lens group has positive refractive power and includes at least four lenses. The at least four lenses can have positive refractive power or negative refractive power. However, they cannot all have negative refractive power. The at least four lenses are arranged sequentially along an optical axis from an object side to an image side; the lens closest to the object side among the at least four lenses includes a convex surface facing the object side, with Helps ensure imaging quality, and includes a concave surface, a convex surface, or a flat surface facing the image side; the lens closest to the image side among at least four lenses includes a convex surface facing the image side, helps ensure imaging quality, and includes A concave surface, a convex surface or a plane facing the object side; the remaining two lenses among the four can be biconvex, biconcave, meniscus, planoconvex or planoconcave lenses; a second lens group, this second lens group has a negative The refractive power includes two 2-1 lenses with negative refractive power or positive refractive power and a 2-2 lens, but not both with positive refractive power; the 2-2 lens includes a convex surface facing the image side, which helps To ensure imaging quality, and including a concave surface, a convex surface or a flat surface facing the object side, the 2-1 lens can be a biconvex, biconcave, meniscus, plano-convex or plano-concave lens; and a third lens group, this third lens The lens group has negative refractive power; the third lens group includes a 3-1 lens, this 3-1 lens is a meniscus lens with negative refractive power; the first lens group, the second lens group, and the third lens group are sequentially along an optical axis from an object side to an image side. arrangement. The above-described embodiment can achieve basic operation.

The present invention provides an imaging lens of a second embodiment. The difference from the first embodiment is that the second lens group can move along the direction of the vertical optical axis to perform optical anti-shake function, and because the second lens group includes two lenses, This helps maintain better image quality when preventing hand shake. The third lens group can move along the optical axis for focusing, and because the third lens group has negative refractive power, it helps control the overall length of the reduced lens when focusing.

The present invention provides an imaging lens of a third embodiment. The difference from the second embodiment is that the first lens group has at least three lenses with positive refractive power and at least one lens with negative refractive power; 2-1 lens and 2-2 lens The refractive power is opposite; when the first lens group includes two meniscus lenses, then the second lens group includes one meniscus lens.

The present invention provides an imaging lens of a fourth embodiment. The difference from the first embodiment is that the first lens group includes a 1-1 lens, a 1-2 lens, a 1-3 lens, a 1-4 lens and a 1- 5 lens, the surface shape of the image side of lens 1-3 is different from that of the object side of lens 2-1. When the surface shape of the object side of lens 2-1 is convex, then the surface shape of the image side of lens 1-3 is concave. , when the surface shape of the object side of the 2-1 lens is concave, then the surface shape of the image side of the 1-3 lens is convex.

The present invention provides an imaging lens according to a fifth embodiment. Please refer to Table 1, Table 2, Table 4, Table 5, Table 7 and Table 8 below. Table 1, Table 4 and Table 7 are respectively the imaging lenses of this embodiment. Table 2, Table 5 and Table 8 are the relevant parameter tables of the aspherical surfaces of the aspheric lenses in Tables 1, 4 and 7 respectively.

Figures 1, 7, and 13 respectively show the first, second, and third comparisons of the imaging lens of the present invention. Schematic diagram of the lens configuration and optical path of the preferred embodiment. The imaging lens 1 includes a first lens group LG11, an aperture ST1, a second lens group LG12 and a third lens group LG13. The first lens group LG11, aperture ST1, second lens group LG12 and third lens group LG13 Arranged sequentially from an object side to an image side along an optical axis OA1, the first lens group LG11 has positive refractive power and includes a 1-1 lens L11, a 1-2 lens L12, a 1-3 lens L13, A 1-4 lens L14 and a 1-5 lens L15. The second lens group LG12 has negative refractive power and includes a 2-1 lens L16 and a 2-2 lens L17. The third lens group LG13 has negative refractive power and includes A 3-1 lens L18. The imaging lens 2 includes a first lens group LG21, an aperture ST2, a second lens group LG22 and a third lens group LG23. The first lens group LG21, the aperture ST2, the second lens group LG22 and the third lens group LG23 are located along the Arranged sequentially from an object side to an image side along an optical axis OA2, the first lens group LG21 has positive refractive power and includes a 1-1 lens L21, a 1-2 lens L22, a 1-3 lens L23, a 1-4 lens L24 and a 1-5 lens L25, the second lens group LG22 has negative refractive power and includes a 2-1 lens L26 and a 2-2 lens L27, and the third lens group LG23 has negative refractive power and includes a 3-1 Lens L28. The imaging lens 3 includes a first lens group LG31, an aperture ST3, a second lens group LG32 and a third lens group LG33. The first lens group LG31, the aperture ST3, the second lens group LG32 and the third lens group LG33 are arranged along the Arranged sequentially from an object side to an image side along an optical axis OA3, the first lens group LG31 has positive refractive power and includes a 1-1 lens L31, a 1-2 lens L32, a 1-3 lens L33, a 1-4 lens L34 and a 1-5 lens L35, the second lens group LG32 has negative refractive power and includes a 2-1 lens L36 and a 2-2 lens L37, and the third lens group LG33 has negative refractive power and includes a 3-1 Lens L38.

1-1 lenses L11, L21, and L31 are biconvex lenses with positive refractive power and are made of glass. The object side surfaces S11, S21, S31, and the image side surfaces S12, S22, and S32 are all convex surfaces, and All are spherical surfaces. 1-2 Lenses L12, L22, and L32 are biconcave lenses with negative refractive power and are made of glass. The object side surfaces S12, S22, S32, and the image side surfaces S13, S23, and S33 are all concave and spherical surfaces. 1-3 lenses L13, L23, and L33 have positive refractive power and are made of glass. The object side surfaces S14, S24, and S34 are convex surfaces, and the object side surfaces S14, S24, and S34 and the image side surfaces S15, S25, and S35 are all spherical surfaces. 1-4 lenses L14, L24, and L34 are meniscus lenses with negative refractive power. The object side surfaces S16, S26, and S36 are convex and aspherical surfaces, and the image side surfaces S17, S27, and S37 are concave and spherical surfaces. Lenses 1-5 L15, L25, and L35 are biconvex lenses with positive refractive power and are made of plastic material. The object side surfaces S18, S28, and S38 are convex and aspherical, and the image side surfaces S19, S29, and S39 are convex and spherical. surface. 2-1 lenses L16, L26, and L36 have negative refractive power and are made of plastic material. The image side surfaces S112, S212, and S312 are concave and spherical surfaces, and the object side surfaces S111, S211, and S311 are aspherical surfaces. 2-2 Lenses L17, L27, and L37 are biconvex lenses with positive refractive power and are made of plastic material. The object side surfaces S113, S213, and S313 are convex and aspherical surfaces, and the image side surfaces S114, S214, and S314 are convex and spherical surfaces. surface. 3-1 Lenses L18, L28, and L38 are meniscus lenses with negative refractive power. The object side surfaces S115, S215, and S315 are convex surfaces, and the image side surfaces S116, S216, and S316 are concave surfaces. The object side surfaces S115, S215, S315, and the image side surfaces S116 , S216 and S316 are all spherical surfaces. The 1-1 lenses L11, L21, and L31 are respectively cemented with the 1-2 lenses L12, L22, and L32 or there is no air gap between the two lenses. In other embodiments, the cemented lens can also be a single positive refractive power lens. Among them, the second lens group LG12 can move along the direction of the vertical optical axis OA1 to perform optical anti-shake function, and the lenses of the second lens group LG12 are made of plastic lenses to help reduce weight and improve response speed. The third lens group LG13 is movable along the optical axis OA1 for focusing. The object side shape of the 1-1 lens and the image side shape of the 1-5 lens can effectively ensure imaging quality. The image side shape of the 1-1 lens can effectively improve chromatic aberration. The 2-1 lens The object side shape and the image side shape of the 2-2 lens can effectively ensure the anti-shake function. The image side shape of the 1-3 lens is different from the object side shape of the 2-1 lens, which contributes to image quality.

The above design can effectively shorten the total length of the lens, effectively improve the resolution, effectively correct chromatic aberration and aberration, and prevent hand shake. In addition, the imaging lens of the present invention can satisfy the following conditions (1) to (7), among which At least one condition is required to optimize the above effects:

Vd4>Vd5; (4)

Among them, fG1 is one of the effective focal lengths of the first lens group LG11, LG21, and LG31 in the first to third preferred embodiments, and fG2 is the effective focal length of the second lens group LG12, LG22, An effective focal length of LG32, fG3 is an effective focal length of the third lens group LG13, LG23, LG33 in the first to third preferred embodiments, f is the imaging lens group 1 in the first to third preferred embodiments , one of the effective focal lengths of 2 and 3, Vd4 is the Abbe coefficient of the 1-4 lenses L14, L24, and L34 in the first to third preferred embodiments, and Vd5 is the Abbe coefficient of the first to third preferred embodiments, The Abbe coefficient of the 1-5 lenses L15, L25, and L35, β is the magnification of the second lens group LG12, LG22, and LG32 in the first to third preferred embodiments, and βr is the first to third preferred embodiments. In the preferred embodiment, the magnification of the third lens group LG13, LG23, and LG33 is one, and BFL is the 3-1 of the third lens group LG13, LG23, and LG33 closest to the image side in the first to third preferred embodiments. Lens L18, L28, The distance between the image sides S116, S216, S316 of L38 and the imaging planes IMA1, IMA2, IMA3 along the optical axes OA1, OA2, OA3, TTL is the first lens group LG11, LG21 in the first to third preferred embodiments. , the distance from the object side S11, S21, S31 of the 1-1 lenses L11, L21, and L31 closest to the object side in LG31 to the imaging plane IMA1, IMA2, IMA3 along the optical axis OA1, OA2, OA3, LG1L is the first In the third preferred embodiment, the object side S11, S21, S31 of the 1-1 lens L11, L21, L31 closest to the object side in the first lens group LG11, LG21, LG31 to the first lens group LG11, LG21, The spacing between the image sides S19, S29 and S39 of the 1-5 lenses L15, L25 and L35 closest to the image side in LG31 along the optical axes OA1, OA2 and OA3. The above magnification refers to the tangent Tan (θ1) of the incident beam angle divided by the tangent Tan (θ2) of the outgoing beam angle. Taking the magnification of the second lens group as an example, Tan (θ1) is measured by passing the collimated light first. A lens group in front of the second lens group. The lens group is provided with a light shield (or aperture) with a radius of a predetermined length on the other side of the lens group relative to the collimated light. Then measure the focus point of the light after passing through the light shield to the light shield. The distance between the plates, then Tan (θ1) is equal to the radius of the light shield divided by the distance from the focus point to the light shield; the measurement method of Tan (θ2) is the same as above, except that the light shield is set at the second lens group relative to the collimated light. On the other side, that is, the collimated light will first pass through the lens group in front of the second lens group and then pass through the second lens group and the light shield. Then the distance from the focus point to the light shield is measured, then Tan (θ2) is equal to the light shield. The radius is divided by the distance from the focus point to the bezel.

fG1/f

0.45時，可有效達到小型化之目的。當滿足條件(2)：-1.2

fG2/f

-0.85時，可有效精準控制防手震透鏡群的移動量。當滿足條件(3)：-0.5

fG3/f

-0.4時，可有效精準控制對焦透鏡群的移動量。當滿足條件(4)：Vd4>Vd5時，可有效減少色差。當滿足條件(5)：-0.92

(1-β)×βr

-0.7時，可有效提升防手震功能。當滿足條件(6)： 2

f/BFL

4時，可有效減少鬼影。當滿足條件(7)：2.8

TTL/LG1L

3.9時，可有效縮短成像鏡頭總長度。 When condition (1) is met: 0.35

fG1/f

When 0.45, the purpose of miniaturization can be effectively achieved. When condition (2) is met: -1.2

fG2/f

-0.85, it can effectively and accurately control the movement amount of the anti-shake lens group. When condition (3) is met: -0.5

fG3/f

-0.4 can effectively and accurately control the movement of the focus lens group. When condition (4) is met: Vd4>Vd5, chromatic aberration can be effectively reduced. When condition (5) is met: -0.92

(1-β)×βr

-0.7 can effectively improve the anti-shake function. When condition (6) is met: 2

f/BFL

At 4, ghosting can be effectively reduced. When condition (7) is met: 2.8

TTL/LG1L

3.9, the total length of the imaging lens can be effectively shortened.

The first preferred embodiment of the imaging lens of the present invention will now be described in detail. Referring to Figure 1, the imaging lens 1 includes a first lens group LG11, an aperture ST1, a second lens group LG12 and a third lens group LG13. The first lens group LG11, the aperture ST1, the second lens group LG12 and the third lens group LG13 are arranged in sequence from an object side to an image side along an optical axis OA1. The first lens group LG11 includes a 1-1 lens L11, a 1-2 lens L12, a 1-3 lens L13, a 1-4 lens L14 and a 1-5 lens L15, 1-1 lenses L11, 1-2 Lens L12, 1-3 lens L13, 1-4 lens L14, and 1-5 lens L15 are arranged in sequence from the object side to the image side along the optical axis OA1. The second lens group LG12 includes a 2-1 lens L16 and a 2-2 lens L17. The 2-1 lens L16 and the 2-2 lens L17 are arranged in sequence from the object side to the image side along the optical axis OA1. The third lens group LG13 includes a 3-1 lens L18. During imaging, the light from the object side is finally imaged on an imaging plane IMA1.

According to the fifth to eighth paragraphs of [Embodiment], wherein: 1-3 lens L13 is a biconvex lens, and its image side S15 is a convex surface; 1-4 lens L14 is made of plastic material; 2-1 lens L16 is a biconcave lens, and its image side S15 is a convex surface; The object side S111 is concave; the 3-1 lens L18 is made of glass; using the above lens design, the imaging lens 1 can effectively shorten the total length of the lens, effectively improve the resolution, effectively correct aberrations, and effectively correct Color difference. 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 ² +Bh ⁴ +Ch ⁶ +Dh ⁸

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

Table 2 is a table of relevant parameters of the aspheric surface of the aspheric 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 preferred embodiment and the calculated values corresponding to conditions (1) to (7).

In addition, the optical performance of the imaging lens 1 of the first preferred embodiment can meet the required requirements. beg. It can be seen from Figure 2 that the longitudinal aberration is between -0.02mm and 0.03mm. It can be seen from Figure 3 that the field curvature is between -0.04mm and 0.03mm. It can be seen from Figure 4 that the distortion is between 0% and 1.5%. It can be seen from Figure 5 that the lateral color difference is between -1μm and 0μm. It can be seen from Figure 6 that the lateral aberration value ranges from -8μm to 8μm. It is obvious that the longitudinal aberration, field curvature, distortion, lateral chromatic aberration, and lateral aberration of the imaging lens 1 of the first preferred embodiment can be effectively corrected, thereby obtaining better optical performance.

The second preferred embodiment of the imaging lens of the present invention will now be described in detail. Please refer to Figure 7. The imaging lens 2 includes a first lens group LG21, an aperture ST2, a second lens group LG22 and a third lens group LG23. The first lens group LG21, the aperture ST2, the second lens group LG22 and the third lens group LG23 are arranged in sequence from an object side to an image side along an optical axis OA2. The first lens group LG21 includes a 1-1 lens L21, a 1-2 lens L22, a 1-3 lens L23, a 1-4 lens L24 and a 1-5 lens L25, 1-1 lenses L21, 1-2 Lens L22, 1-3 lens L23, 1-4 lens L24, and 1-5 lens L25 are arranged in sequence from the object side to the image side along the optical axis OA2. The second lens group LG22 includes a 2-1 lens L26 and a 2-2 lens L27. The 2-1 lens L26 and the 2-2 lens L27 are arranged in sequence from the object side to the image side along the optical axis OA2. The third lens group LG23 includes a 3-1 lens L28. During imaging, the light from the object side is finally imaged on an imaging plane IMA2.

According to the fifth to eighth paragraphs of [Embodiment], wherein: 1-3 lens L23 is a meniscus lens, and its image side S25 is concave; 1-4 lens L24 is made of glass material; 2-1 lens L26 is a meniscus lens. Type lens, the object side S211 is a convex surface; the 3-1 lens L28 is made of plastic material; using the design of the above lens, the imaging lens 2 can effectively shorten the total length of the lens, effectively improve the resolution, and effectively correct aberrations , effectively correct chromatic aberration. Table 4 is a table of relevant parameters of each lens of the imaging lens 2 in Figure 7.

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, and will not be repeated here. Table 5 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 4.

Table 6 shows the relevant parameter values of the imaging lens 2 of the second embodiment and the calculated values corresponding to conditions (1) to (7).

In addition, the optical performance of the imaging lens 2 of the second preferred embodiment can meet the requirements. It can be seen from Figure 8 that the longitudinal aberration is between -0.01mm and 0.04mm. It can be seen from Figure 9 that the field curvature is between -0.03mm and 0.04mm. It can be seen from Figure 10 that the distortion is between 0% and 1.5%. It can be seen from Figure 11 that the lateral color difference is between -1μm and 0μm. It can be seen from Figure 12 that the lateral aberration value ranges from -8μm to 8μm. It is obvious that the longitudinal aberration, field curvature, distortion, lateral chromatic aberration, and lateral aberration of the imaging lens 2 of the second preferred embodiment can be effectively corrected, thereby obtaining better optical performance.

The third preferred embodiment of the imaging lens of the present invention will now be described in detail. Please refer to Figure 13. The imaging lens 3 includes a first lens group LG31, an aperture ST3, a second lens group LG32 and a third lens group LG33. The first lens group LG31, the aperture ST3, the second lens group LG32 and the third lens group LG33 are arranged in sequence from an object side to an image side along an optical axis OA3. The first lens group LG31 includes a 1-1 lens L31, a 1-2 lens L32, a 1-3 lens L33, a 1-4 lens L34 and a 1-5 lens L35, 1-1 lenses L31, 1-2 Lens L32, 1-3 lens L33, 1-4 lens L34, and 1-5 lens L35 are arranged in sequence from the object side to the image side along the optical axis OA3. The second lens group LG32 includes a 2-1 lens L36 and a 2-2 lens L37. The 2-1 lens L36 and the 2-2 lens L37 are arranged in sequence from the object side to the image side along the optical axis OA3. The third lens group LG33 includes a 3-1 lens L38. During imaging, the light from the object side is finally imaged on an imaging plane IMA3.

According to the fifth to eighth paragraphs of [Embodiment], wherein: 1-3 lens L33 is a meniscus lens, and its image side S35 is concave; 1-4 lens L34 is made of plastic material; 2-1 lens L36 is a meniscus lens. Type lens, the object side S311 is a convex surface; the 3-1 lens L38 is made of glass material; using the design of the above lens, the imaging lens 3 can effectively shorten the total length of the lens, effectively improve the resolution, and effectively correct aberrations , effectively correct chromatic aberration. Table 7 shows the imaging in Figure 13 Relevant parameter table of each lens of Lens 3.

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, and will not be repeated here. Table 8 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 7.

Table 9 shows the relevant parameter values of the imaging lens 3 of the third embodiment and the calculated values corresponding to conditions (1) to (7).

In addition, the optical performance of the imaging lens 3 of the third preferred embodiment can also meet the requirements. It can be seen from Figure 14 that the longitudinal aberration is between -0.01mm and 0.03mm. It can be seen from Figure 15 that the field curvature is between -0.02mm and 0.03mm. It can be seen from Figure 16 that the distortion is between 0% and 1.5%. It can be seen from Figure 17 that the lateral color difference is between -1μm and 0μm. It can be seen from Figure 18 that the lateral aberration value ranges from -8μm to 8μm. It is obvious that the longitudinal aberration, field curvature, distortion, lateral chromatic aberration, and lateral aberration of the imaging lens 3 of the third preferred embodiment can be effectively corrected, 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 modifications and modifications without departing from the spirit and scope of the present invention. Therefore, the protection of the present invention is The scope shall be determined by the appended patent application scope.

1: Imaging lens

LG12: Second lens group

IMA1: Imaging plane

L11:1-1 lens

L13:1-3 lens

L15:1-5 lens

L17:2-2 lens

ST1: Aperture

S12:1-1 lens image side

S13:1-2 lens image side

S15:1-3 lens image side

LG11: First lens group

LG13: Third lens group

OA1: optical axis

L12:1-2 lens

L14:1-4 lens

L16:2-1 lens

L18:3-1 lens

S11:1-1 lens object side

S12:1-2 lens object side

S14:1-3 lens object side

S16:1-4 lens object side

S17:1-4 lens image side

S18:1-5 lens object side

S19:1-5 lens image side

S110: Aperture surface

S111:2-1 lens object side

S112:2-1 lens image side

S113:2-2 lens object side

S114:2-2 lens image side

S115:3-1 lens object side

S116:3-2 lens image side

Claims (10)

An imaging lens, including: a first lens group, the first lens group has positive refractive power, the first lens group includes at least four lenses, wherein the lenses are arranged along an optical axis from an object side to an image side. Arranged in sequence, wherein the lens closest to the object side includes a convex surface facing the object side, and the lens closest to the image side includes a convex surface facing the image side; a second lens group, the second lens group has Negative refractive power, the second lens group includes a 2-1 lens and a 2-2 lens, wherein the 2-2 lens includes a convex surface facing the image side; and a third lens group, the third lens group has negative refractive power , the third lens group includes a 3-1 lens, the 3-1 lens is a meniscus lens with negative refractive power; wherein the first lens group, the second lens group and the third lens group are along the optical axis Arranged in sequence from the object side to the image side; wherein the 2-1 lens and the 2-2 lens are arranged in sequence from the object side to the image side along the optical axis; wherein the second lens group can be arranged along the optical axis. Move perpendicular to the optical axis direction; wherein the third lens group can move along the optical axis direction. An imaging lens, including: a first lens group, the first lens group has positive refractive power, the first lens group includes at least four lenses, wherein the lenses are arranged along an optical axis from an object side to an image side. Arranged in sequence, wherein the lens closest to the object side includes a convex surface facing the object side, and the lens closest to the image side includes a convex surface facing the image side; a second lens group, the second lens group has Negative refractive power, the second lens group includes a 2-1 lens and a 2-2 lens, wherein the 2-2 lens includes a convex surface facing the image side; and A third lens group, the third lens group has negative refractive power, the third lens group includes a 3-1 lens, the 3-1 lens is a meniscus lens with negative refractive power; wherein the first lens group, the third lens group The two lens groups and the third lens group are arranged in sequence from the object side to the image side along the optical axis; wherein the 2-1 lens and the 2-2 lens are arranged along the optical axis from the object side to the image side. The sides are arranged in order; wherein the first lens group includes a 1-1 lens, a 1-2 lens, a 1-3 lens, a 1-4 lens and a 1-5 lens, the 1-1 lens, the 1 The -2 lens, the 1-3 lens, the 1-4 lens and the 1-5 lens are arranged in sequence from the object side to the image side along the optical axis. An imaging lens, including: a first lens group, the first lens group has positive refractive power, the first lens group includes at least four lenses, wherein the lenses are arranged along an optical axis from an object side to an image side. Arranged in sequence, wherein the lens closest to the object side includes a convex surface facing the object side, and the lens closest to the image side includes a convex surface facing the image side; a second lens group, the second lens group has Negative refractive power, the second lens group includes a 2-1 lens and a 2-2 lens, wherein the 2-2 lens includes a convex surface facing the image side; and a third lens group, the third lens group has negative refractive power , the third lens group includes a 3-1 lens, the 3-1 lens is a meniscus lens with negative refractive power; wherein the first lens group, the second lens group and the third lens group are along the optical axis Arranged in sequence from the object side to the image side; wherein the 2-1 lens and the 2-2 lens are arranged in sequence from the object side to the image side along the optical axis; wherein the first lens group includes a 1 -1 lens, one 1-2 lens, one 1-3 lens, one 1-4 lens and one 1-5 lens; The 3-1 lens includes a convex surface facing the object side and a concave surface facing the image side; wherein the 1-1 lens, the 1-2 lens, the 1-3 lens, the 1-4 lens and the 1-5 The lenses are arranged sequentially from the object side to the image side along the optical axis. Such as the imaging lens described in item 2 or 3 of the patent application scope, wherein: the 1-3 lens has positive refractive power; the 2-1 lens has negative refractive power; when the 1-3 lens is a biconvex lens and includes a convex surface When the 2-1 lens is facing the object side and the other convex surface is facing the image side, the 2-1 lens is a biconcave lens and includes a concave surface facing the object side and another concave surface facing the image side; and when the 1-3 lens is a meniscus type lens, the 2-1 lens is also a meniscus type lens. The imaging lens described in item 4 of the patent application, wherein: when the 1-3 lens is a meniscus lens, the 1-3 lens includes a convex surface facing the object side and a concave surface facing the image side; and When the 2-1 lens is a meniscus lens, the 2-1 lens includes a convex surface facing the object side and a concave surface facing the image side. An imaging lens, including: a first lens group, the first lens group has positive refractive power, the first lens group includes at least four lenses, wherein the lenses are arranged along an optical axis from an object side to an image side. Arranged in sequence, wherein the lens closest to the object side includes a convex surface facing the object side, and the lens closest to the image side includes a convex surface facing the image side; a second lens group, the second lens group has Negative refractive power, the second lens group includes a 2-1 lens and a 2-2 lens, wherein the 2-2 lens includes a convex surface facing the image side; and A third lens group, the third lens group has negative refractive power, the third lens group includes a 3-1 lens, the 3-1 lens is a meniscus lens with negative refractive power; wherein the first lens group, the third lens group The two lens groups and the third lens group are arranged in sequence from the object side to the image side along the optical axis; wherein the 2-1 lens and the 2-2 lens are arranged along the optical axis from the object side to the image side. The sides are arranged in sequence; wherein the first lens group includes a 1-1 lens, a 1-2 lens, a 1-3 lens, a 1-4 lens and a 1-5 lens; wherein the 3-1 lens includes a A convex surface faces the object side and a concave surface faces the image side; wherein the 1-1 lens, the 1-2 lens, the 1-3 lens, the 1-4 lens and the 1-5 lens are oriented along the optical axis from the Arranged in order from the object side to the image side; wherein the 1-3 lens has positive refractive power; wherein the 2-1 lens has negative refractive power; when the 1-3 lens is a biconvex lens and includes a convex surface facing the object side and another When the convex surface faces the image side, the 2-1 lens is a biconcave lens and includes a concave surface facing the object side and another concave surface facing the image side; when the 1-3 lens is a meniscus lens, then the 2- Lens 1 is also a meniscus lens; wherein lens 1-1 is a biconvex lens with positive refractive power and includes a convex surface facing the object side and another convex surface facing the image side; lens 1-2 is a biconcave lens with negative refractive power. The refractive power includes a concave surface facing the object side and another concave surface facing the image side; wherein the 1-4 lens is a meniscus lens with negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side; The 1-5 lens is a biconvex lens with positive refractive power, and includes a convex surface facing the object side and another convex surface facing the image side; wherein the 2-2 lens is a biconvex lens with positive refractive power, and further includes a convex surface facing the object side. An imaging lens, including: a first lens group, the first lens group has positive refractive power, the first lens group includes at least four lenses, wherein the lenses are arranged along an optical axis from an object side to an image side. Arranged in sequence, wherein the lens closest to the object side includes a convex surface facing the object side, and the lens closest to the image side includes a convex surface facing the image side; a second lens group, the second lens group has Negative refractive power, the second lens group includes a 2-1 lens and a 2-2 lens, wherein the 2-2 lens includes a convex surface facing the image side; and a third lens group, the third lens group has negative refractive power , the third lens group includes a 3-1 lens, the 3-1 lens is a meniscus lens with negative refractive power; wherein the first lens group, the second lens group and the third lens group are along the optical axis Arranged in sequence from the object side to the image side; wherein the 2-1 lens and the 2-2 lens are arranged in sequence from the object side to the image side along the optical axis; wherein the imaging lens satisfies at least one of the following Condition: 0.35

fG1/f

0.45;-0.5

fG3/f

-0.4; Vd4>Vd5; -0.92

(1-β)×βr

-0.7;2

f/BFL

4;2.8

TTL/LG1L

3.9; Among them, fG1 is the effective focal length of one of the first lens groups, fG3 is the effective focal length of one of the third lens groups, f is the effective focal length of one of the imaging lenses, and Vd4 is the Abbe coefficient of one of the 1-4 lenses. , Vd5 is the Abbe coefficient of one of the 1-5 lenses, β is the magnification of one of the second lens group, βr is the magnification of one of the third lens group, and BFL is the closest to the image in the third lens group The distance from the image side of one side lens to an imaging surface along the optical axis, TTL is the distance from the object side of the lens closest to the object side in the first lens group to the imaging surface along the optical axis A distance, LG1L is one of the distances along the optical axis from the object side of the lens closest to the object side in the first lens group to the image side of the lens closest to the image side in the first lens group spacing. For example, the imaging lens described in Item 1, Item 2, Item 3, Item 6 or Item 7 of the patent application further includes an aperture disposed between the first lens group and the second lens group, The imaging lens meets the following conditions: -1.2

fG2/f

-0.85; where fG2 is the effective focal length of one of the second lens groups, and f is the effective focal length of one of the imaging lenses. For example, the imaging lens described in Item 1, Item 2, Item 3, Item 6 or Item 7 of the patent application scope, wherein: at least three of the lenses in the first lens group have positive refractive power; The refractive power of the 2-1 lens is opposite to that of the 2-2 lens; and when the first lens group includes two meniscus lenses, the second lens group includes one meniscus lens. For example, in the imaging lens described in item 2 or 3 of the patent application, the 1-4 lens has negative refractive power, and the object-side surface shape of the 2-1 lens is different from the image-side surface shape of the 1-3 lens, when When the surface shape of the object side of lens 2-1 is convex, then the surface shape of the image side of lens 1-3 is concave. When the surface shape of the object side of lens 2-1 is concave, then the surface shape of the image side of lens 1-3 is concave. The surface shape is convex.

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