TW202343057A - Lens assembly - Google Patents

Abstract

A lens assembly includes a first lens group, a second lens group, a third lens group, and a fourth lens group, all of which are arranged in order from an object side to an image side along an optical axis. The first lens group is with positive refractive power. The second lens group is with negative refractive power and includes at least two lenses which are with negative refractive power. The third lens group is with positive refractive power and includes a 3-1 lens, a 3-2 lens, and a 3-3 lens, wherein the 3-1 lens is with positive refractive power and the 3-3 lens includes a concave surface facing the object side. The fourth lens group is with positive refractive power. The 3-1 lens, the 3-2 lens, and the 3-3 lens are arranged in order from the object side to the image side along the optical axis and these lenses are adjacent to each other.

Description

Imaging lens(66)

The invention relates to an imaging lens.

Most of the conventional surveillance cameras do not have zoom function, but with the development of industrial automation and the Internet of Things, people have more and more requirements for surveillance cameras, especially for miniaturization, high resolution, low cost and high zoom ratio. The requirements are getting higher and higher. The conventional imaging lens can no longer meet the requirements of today's surveillance cameras. An imaging lens with another new architecture is needed to meet the requirements of miniaturization, high resolution, low cost and high zoom magnification at the same time to meet the requirements of surveillance cameras. needs.

In view of this, the main purpose of the present invention is to provide an imaging lens with a shorter overall length, higher resolution, lower cost, and higher zoom magnification, but still has good optical performance.

The imaging lens of the present invention includes a first lens group, a second lens group, a third lens group and a fourth lens group. The first lens group has positive refractive power. The second lens group has negative refractive power, and the second lens group includes at least two lenses with negative refractive power. The third lens group has positive refractive power. The third lens group includes a 3-1 lens, a 3-2 lens and a 3-3 lens. The 3-1 lens has positive refractive power. The 3-3 lens includes a concave surface facing One thing side. The fourth lens group has positive Refractive power. The first lens group, the second lens group, the third lens group and the fourth lens group are arranged in sequence from the object side to an image side along an optical axis. The 3-1 lens, the 3-2 lens and the 3-3 lens are arranged in sequence from the object side to the image side along the optical axis, and these lenses are adjacent to each other. When the imaging lens of the present invention meets the above characteristics and does not require other additional features or conditions, the basic functions of the imaging lens of the present invention can be achieved.

The first lens group includes a 1-1 lens and a 1-2 lens. 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 has a positive refractive power. refractive power, and includes a convex surface facing the object side. The second lens group includes a 2-1 lens and a 2-2 lens. The 2-1 lens has negative refractive power and includes a concave surface facing the image side. The 2-2 lens has negative refractive power and includes a concave surface facing the object side. The third lens group may further include a 3-4 lens disposed between the 3-3 lens and the fourth lens group. The 3-1 lens is a biconvex lens and includes a convex surface facing the object side and another convex surface facing the image side. 3 -2 lens has positive refractive power and includes a convex surface facing the object side, 3-3 lens is a biconcave lens with negative refractive power, and may further include another concave surface facing the image side, 3-4 lens is a meniscus lens with negative refractive power, and It includes a convex surface facing the object side and a concave surface facing the image side. The fourth lens group includes a 4-1 lens. The 4-1 lens has positive refractive power and includes a convex surface facing the object side. The 1-1 lens and the 1-2 lens 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 fourth lens group may further include a 4-2 lens disposed between the third lens group and the 4-1 lens, wherein the 1-2 lens is a meniscus lens and may further include a concave surface facing the image side. The 2-1 lens is a meniscus lens and may further include a convex surface facing the object side. The 2-2 lens is a meniscus lens and may further include a convex surface facing the image side. The 3-2 lens is a meniscus lens and may further include a concave surface facing the image side. The 4-1 lens is a biconvex lens and may further include another convex surface facing the image side. The 4-2 lens is a meniscus lens with negative refractive power and includes a concave surface facing the object side and a convex surface facing the image side.

The first lens group may further include a 1-3 lens disposed between the object side and the 1-1 lens, wherein the 3-2 lens is a biconvex lens, and may further include another convex surface facing the image side. The 4-1 lens is a meniscus lens and may further include a concave surface facing the image side. Lens 1-3 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 1-2 lens is a biconvex lens and may further include another convex surface facing the image side. The 2-1 lens is a biconcave lens and may further include another concave surface facing the object side. The 2-2 lens is a biconcave lens and may further include another concave surface facing the image side.

The second lens group may further include a 2-3 lens disposed between the 2-2 lens and the third lens group, wherein the 1-2 lens is a meniscus lens and may further include a concave surface facing the image side. The 2-1 lens is a meniscus lens and may further include a convex surface facing the object side. The 2-2 lens is a meniscus lens and may further include a convex surface facing the image side. The 2-3 lens is a meniscus lens with positive refractive power and includes a convex surface facing the object side and a concave surface facing the image side.

The third lens group may further include an aperture disposed between the second lens group and the 3-1 lens.

The distance between these lens groups can be changed along the optical axis, so that the imaging lens can zoom from a wide-angle end to an intermediate end and then to a telephoto end to change the focal length. The fourth lens group can move along the optical axis to focus.

FOV/f1

0.49度/mm；-0.36

fG1/f1

0.68；-0.13

fG2/fG23

0.55；18

TTL/TG34

74；其中，FOV為成像鏡頭之一最大視場，f1為最靠近物側之一透鏡之一有效焦距，fG1為第一透鏡群之一有效焦距，fG2為第二透鏡群之一有效焦距，fG23為第二透鏡群中最靠近像側之一透鏡之一有效焦距， TTL為第一透鏡群中最靠近物側之一透鏡之一物側面至一成像面沿著光軸之一間距，TG34為第三透鏡群中最靠近像側之一透鏡沿著光軸之一厚度。 The imaging lens meets at least one of the following conditions: -0.34 degrees/mm

FOV/f1

0.49 degrees/mm; -0.36

fG1/f1

0.68;-0.13

fG2/fG23

0.55;18

TTL/TG34

74; where FOV is the maximum field of view of one of the imaging lenses, f1 is the effective focal length of one of the lenses closest to the object side, fG1 is the effective focal length of one of the first lens groups, fG2 is the effective focal length of one of the second lens groups, fG23 is the effective focal length of the lens closest to the image side in the second lens group, TTL is the distance along the optical axis from the object side of the lens closest to the object side in the first lens group to an imaging surface, TG34 It is the thickness of the lens closest to the image side in the third lens group along the optical axis.

VdG1+VdG3

107；-3.9

(L1R1×L1R2)/(L2R1×L2R2)

-0.05；65

VdG31+VdG34

100；其中，VdG1為第一透鏡群之全部透鏡之一平均阿貝係數，VdG3為第三透鏡群之全部透鏡之一平均阿貝係數，L1R1為最靠近物側之一透鏡之一物側面之一曲率半徑，L1R2為最靠近物側之透鏡之一像側面之一曲率半徑，L2R1為第二靠近物側之一透鏡之一物側面之一曲率半徑，L2R2為第二靠近物側之透鏡之一像側面之一曲率半徑，VdG31為第三透鏡群中最靠近物側之一透鏡之一阿貝係數，VdG34為第三透鏡群中最靠近像側之一透鏡之一阿貝係數。 The imaging lens meets at least one of the following conditions: 90

VdG1+VdG3

107;-3.9

(L1R1×L1R2)/(L2R1×L2R2)

-0.05;65

VdG31+VdG34

100; where VdG1 is the average Abbe coefficient of all the lenses in the first lens group, VdG3 is the average Abbe coefficient of all the lenses in the third lens group, and L1R1 is the object side of the lens closest to the object side. A radius of curvature, L1R2 is the radius of curvature of the image side of the lens closest to the object side, L2R1 is the radius of curvature of the object side of the lens closest to the object side, L2R2 is the radius of curvature of the image side of the lens closest to the object side The radius of curvature of an image side, VdG31 is the Abbe coefficient of one of the lenses closest to the object side in the third lens group, and VdG34 is the Abbe coefficient of one of the lenses closest to the image side in the third lens group.

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

LG11, LG21, LG31: First lens group

LG12, LG22, LG32: Second lens group

LG13, LG23, LG33: Third lens group

LG14, LG24, LG34: Fourth lens group

OF1, OF2, OF3: optical filter

CG1, CG2, CG3: Protective glass

IMA1, IMA2, IMA3: imaging surface

L11, L21, L31 1-1: Lens

L12, L22, L32 1-2: Lens

L13, L23, L33 2-1: Lens

L14, L24, L34 2-2: Lens

L15, L25, L35 3-1: Lens

L16, L26, L36 3-2: Lens

L17, L27, L37 3-3: Lens

L18, L28, L38 3-4: Lens

L19, L29, L39 4-1: Lens

L110, L310 1-3: Lens

L210 4-2: Lens

L111 2-3: Lens

ST1, ST2, ST3: Aperture

OA1, OA2, OA3: optical axis

S13, S21, S33 1-1: Lens object side

S14, S22, S34 1-1: Lens image side

S15, S23, S35 1-2: Lens object side

S16, S24, S36 1-2: Lens image side

S17, S25, S37 2-1: Lens object side

S18, S26, S38 2-1: Lens image side

S19, S27, S39 2-2: Lens object side

S110, S28, S310 2-2: Lens image side

S113, S29, S311: Aperture surface

S114, S210, S312 3-1: Lens object side

S115, S211, S313 3-1: Lens image side

S116, S212, S314 3-2: Lens object side

S117, S213, S315 3-2: Lens image side

S118, S214, S316 3-3: Lens object side

S119, S215, S317 3-3: Lens image side

S120, S216, S318 3-4: Lens object side

S121, S217, S319 3-4: Lens image side

S122, S220, S320 4-1: Lens object side

S123, S221, S321 4-1: Lens image side

S11, S31 1-3: Lens object side

S12, S32 1-3: Lens image side

S218 4-2: Lens object side

S219 4-2: Lens image side

S111 2-3: Lens object side

S112 2-3: Lens image side

S124, S222, S322: filter side

S125, S223, S323: filter image side

S126, S224, S324: Protect the sides of glass objects

S127, S225, S325: Protective glass like side

Figures 1A, 1B, and 1C are schematic diagrams of the lens configuration and optical path of the first embodiment of the imaging lens according to the present invention at a wide-angle end, an intermediate end, and a telephoto end.

Figures 2A, 2B, and 2C are longitudinal aberration (Longitudinal Aberration), field curvature (Field Curvature), and distortion (Distortion) diagrams at the wide-angle end of the first embodiment of the imaging lens according to the present invention.

Figures 3A, 3B, and 3C are longitudinal aberration diagrams, field curvature diagrams, and distortion diagrams at the intermediate end of the first embodiment of the imaging lens according to the present invention.

Figures 4A, 4B, and 4C are longitudinal aberration diagrams, field curvature diagrams, and distortion diagrams at the telephoto end of the first embodiment of the imaging lens according to the present invention.

Figures 5A, 5B, and 5C are schematic diagrams of the lens configuration and optical path at a wide-angle end, an intermediate end, and a telephoto end of the second embodiment of the imaging lens according to the present invention.

Figures 6A, 6B, and 6C are longitudinal aberration diagrams, field curvature diagrams, and distortion diagrams at the wide-angle end of the imaging lens according to the second embodiment of the present invention.

Figures 7A, 7B, and 7C are longitudinal aberration diagrams, field curvature diagrams, and distortion diagrams at the intermediate end of the imaging lens according to the second embodiment of the present invention.

Figures 8A, 8B, and 8C are longitudinal aberration diagrams, field curvature diagrams, and distortion diagrams at the telephoto end of the imaging lens according to the second embodiment of the present invention.

Figures 9A, 9B, and 9C are schematic diagrams of the lens configuration and optical path at a wide-angle end, an intermediate end, and a telephoto end of the third embodiment of the imaging lens according to the present invention.

Figures 10A, 10B, and 10C are longitudinal aberration diagrams, field curvature diagrams, and distortion diagrams at the wide-angle end of the imaging lens according to the third embodiment of the present invention.

Figures 11A, 11B, and 11C are longitudinal aberration diagrams, field curvature diagrams, and distortion diagrams at the intermediate end of the third embodiment of the imaging lens according to the present invention.

Figures 12A, 12B, and 12C are longitudinal aberration diagrams, field curvature diagrams, and distortion diagrams at the telephoto end of the imaging lens according to the third embodiment of the present invention.

The invention provides an imaging lens, including: a first lens group with positive refractive power; a second lens group with negative refractive power; the second lens group includes at least two lenses with negative refractive power. Lens; a third lens group, this third lens group has With positive refractive power, the third lens group includes a 3-1 lens, a 3-2 lens and a 3-3 lens, the 3-1 lens has positive refractive power, and the 3-3 lens includes a concave surface facing an object side; And a fourth lens group, this fourth lens group has positive refractive power; wherein the first lens group, the second lens group, the third lens group and the fourth lens group are sequentially along an optical axis from the object side to an image side. Arranged; the 3-1 lens, 3-2 lens and 3-3 lens are arranged in sequence from the object side to the image side along the optical axis, and these lenses are adjacent to each other. When the imaging lens of the present invention meets the above characteristics, it is a preferred embodiment of the present invention.

The imaging lens of the present invention is a variable focal length lens. The first lens group is fixed, and the second lens group, the third lens group and the fourth lens can move along the optical axis to change the distance between each lens group, so that the imaging lens can be changed from Zoom from a wide-angle end to a mid-range end and then zoom to a telephoto end. The zoom magnification of each embodiment of the imaging lens from the wide-angle end to the telephoto end is approximately 3 times.

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

Figures 1A, 1B, and 1C are schematic diagrams of the lens configuration and optical path of the first embodiment of the imaging lens according to the present invention at a wide-angle end, an intermediate end, and a telephoto end. Figures 5A, 5B, and 5C are schematic diagrams of the imaging lens according to the present invention. A schematic diagram of the lens configuration and optical path of the second embodiment of the imaging lens at a wide-angle end, an intermediate end, and a telephoto end. Figures 9A, 9B, and 9C show the third embodiment of the imaging lens according to the present invention at a wide-angle end, Schematic diagram of the lens configuration and optical path of one intermediate end and one telephoto end. The imaging lens 1 includes a first lens group LG11, a second lens group LG12, a third lens group LG13 and a fourth lens group LG14. The first lens group LG11 has positive refractive power and includes a 1-3 lens L110, a 1-1 lens L11 and a 1-2 lens L12, the second lens group LG12 has negative refractive power and includes a 2-1 lens L13, a 2-2 lens L14 and a 2-3 lens L111, The third lens group LG13 has positive refractive power and includes an aperture ST1, a 3-1 lens L15, a 3-2 lens L16, a 3-3 lens L17 and a 3-4 lens L18. The fourth lens group LG14 has positive refractive power. Also includes a 4-1 lens L19. The imaging lens 2 includes a first lens group LG21, a second lens group LG22, a third lens group LG23 and a fourth lens group LG24. The first lens group LG21 has positive refractive power and includes a 1-1 lens L21 and a 1-2 lens L22, the second lens group LG22 has negative refractive power and includes a 2-1 lens L23 and a 2-2 lens L24, and the third lens group LG23 has positive refractive power and includes an aperture ST2 and a 3-1 lens L25 , a 3-2 lens L26, a 3-3 lens L27 and a 3-4 lens L28. The fourth lens group LG24 has positive refractive power and includes a 4-2 lens L210 and a 4-1 lens L29. The imaging lens 3 includes a first lens group LG31, a second lens group LG32, a third lens group LG33 and a fourth lens group LG34. The first lens group LG31 has positive refractive power and includes a 1-3 lens L310, a 1-1 lens L31 and a 1-2 lens L32, the second lens group LG32 has negative refractive power and includes a 2-1 lens L33 and a 2-2 lens L34, and the third lens group LG33 has positive refractive power and includes an aperture ST3 , a 3-1 lens L35, a 3-2 lens L36, a 3-3 lens L37 and a 3-4 lens L38. The fourth lens group LG34 has positive refractive power and includes a 4-1 lens L39.

1-1 lenses L11, L21, and L31 are biconvex lenses with positive refractive power and are made of glass. The object side surfaces S13, S21, and S33 are convex surfaces, the image side surfaces S14, S22, and S34 are convex surfaces, and the object side surfaces S13, S21, and S33 are convex surfaces. The image side surfaces S14, S22 and S34 are all spherical surfaces. 1-2 lenses L12, L22, and L32 have positive refractive power and are made of glass. The object side surfaces S15, S23, and S35 are convex surfaces, and the object side surfaces S15, S23, and S35 and the image side surfaces S16, S24, and S36 are all spherical surfaces. 2-1 lenses L13, L23, and L33 have negative refractive power and are made of glass. The image side surfaces S18, S26, and S38 are concave surfaces, and the object side surfaces S17, S25, and S37 and the image side surfaces S18, S26, and S38 are all spherical surfaces. 2-2 lenses L14, L24, and L34 have negative refractive power and are made of glass. The object side surfaces S19, S27, and S39 are concave surfaces, and the object side surfaces S19, S27, and S39 and the image side surfaces S110, S28, and S310 are all spherical surfaces. 3-1 Lenses L15, L25, and L35 are biconvex lenses with positive refractive power and are made of glass. The object side surfaces S114, S210, and S312 are convex surfaces, the image side surfaces S115, S211, and S313 are convex surfaces, and the object side surfaces S114, S210, and S312 are convex surfaces. The image side surfaces S115, S211 and S313 are all spherical surfaces. 3-2 lenses L16, L26, and L36 have positive refractive power and are made of glass. The object side surfaces S116, S212, and S314 are convex surfaces, and the object side surfaces S116, S212, and S314 and the image side surfaces S117, S213, and S315 are all spherical surfaces. 3-3 Lenses L17, L27, and L37 are biconcave lenses with negative refractive power and are made of glass. The object side surfaces S118, S214, and S316 are concave surfaces, the image side surfaces S119, S215, and S317 are concave surfaces, and the object side surfaces S118, S214, and S316 are concave surfaces. The image sides S119, S215 and S317 are all spherical surfaces. 3-4 lenses L18, L28, and L38 are meniscus lenses with negative refractive power and are made of glass. The object side surfaces S120, S216, and S318 are convex surfaces, the image side surfaces S121, S217, and S319 are concave surfaces, and the object side surfaces S120 and S216 , S318 and image side surfaces S121, S217 and S319 are all spherical surfaces. 4-1 lenses L19, L29, and L39 have positive refractive power and are made of glass. The object side surfaces S122, S220, and S320 are convex surfaces. The object side surfaces S122, S220, and S320 and the image side surfaces S123, S221, and S321 are all spherical surfaces.

In addition, the imaging lenses 1, 2, and 3 at least satisfy the following conditions (1) to (7). The first condition is a preferred embodiment of the present invention:

Wherein, FOV is the maximum field of view of one of the imaging lenses 1, 2, and 3 in the first to third embodiments, f1 is the lens L110, one of the lenses closest to the object side in the first to third embodiments. The effective focal length of L21 and L310, fG2 is the effective focal length of the second lens group LG12, LG22, and LG32 in the first to third embodiments, and fG23 is the second effective focal length of the second lens group LG12, LG22, and LG32 in the first to third embodiments. One of the effective focal lengths of the lenses L111, L24, and L34 closest to the image side in the lens group LG12, LG22, and LG32, TTL is the lens group LG11, LG21, and LG31 closest to the object in the first to third embodiments. The distance between the object side surfaces S11, S21 and S31 of the lenses L110, L21 and L310 and the imaging planes IMA1, IMA2 and IMA3 along the optical axes OA1, OA2 and OA3, TG34 is the distance between the first to third embodiments, The thickness of the lenses L18, L28 and L38 closest to the image side in the third lens group LG13, LG23 and LG33 along the optical axes OA1, OA2 and OA3, VdG1 is the thickness of the first lens in the first to third embodiments. The average Abbe coefficient of all the lenses in the third lens group LG11, LG21, and LG31, VdG3, is the average Abbe coefficient of all the lenses in the third lens group LG13, LG23, and LG33 in the first to third embodiments, and L1R1 is In the first to third embodiments, the curvature radius of the object side surfaces S11, S21, and S31 of the lenses L110, L21, and L310 closest to the object side, L1R2 is the closest to the object side in the first to third embodiments. The curvature radius of the image side surfaces S12, S22, and S32 of the object-side lenses L110, L21, and L310, L2R1 is the object-side surface of the second object-side lens L11, L22, and L31 in the first to third embodiments. The radius of curvature of S13, S23, and S33, L1R2 is the radius of curvature of the image side surfaces S14, S24, and S34 of the second lens L11, L22, and L31 close to the object side in the first to third embodiments, and VdG31 is In the first to third embodiments, the third lens group LG13, LG23, and LG33 is the closest to The Abbe coefficient of the object-side lenses L15, L25, and L35, VdG34, is the one of the lenses L18, L28, and L38 closest to the image side in the third lens group LG13, LG23, and LG33 in the first to third embodiments. - Abbe coefficient. The imaging lenses 1, 2, and 3 can effectively shorten the total length of the lens, effectively improve the resolution, effectively correct aberrations, and realize the optical zoom function.

FOV/f1

0.49度/mm時，可避免最靠近物側的透鏡屈光力過大，有利於最靠近物側的透鏡製作。當滿足條件(2)：-0.36

fG1/f1

0.68時，可有效降低製造敏感度，以提升影像品質。當滿足條件(3)：-0.13

fG2/fG23

0.55時，可提升成像鏡頭之相對照度。當滿足條件(4)：18

TTL/TG34

74時，可有效縮短成像鏡頭總長度。當滿足條件(5)：90

VdG1+VdG3

107時，可有效降低色差，提升影像品質。當滿足條件(6)：-3.9

(L1R1×L1R2)/(L2R1×L2R2)

-0.05時，可有效降低製造敏感度，有利於成像鏡頭製作。當滿足條件(7)：65

VdG31+VdG34

100時，可有效降低成像鏡頭色散值。當同時滿足條件(1)、(5)及(7)：-0.34度/mm

FOV/f1

0.49度/mm；90

VdG1+VdG3

107；及65

VdG31+VdG34

100時，可有效降低色散，提高影像品質。 When condition (1) is met: -0.34 degrees/mm

FOV/f1

At 0.49 degrees/mm, it can avoid the refractive power of the lens closest to the object side being too large, which is beneficial to the production of the lens closest to the object side. When condition (2) is met: -0.36

fG1/f1

At 0.68, the manufacturing sensitivity can be effectively reduced to improve image quality. When condition (3) is met: -0.13

fG2/fG23

At 0.55, the relative illumination of the imaging lens can be increased. When condition (4) is met: 18

TTL/TG34

74 hours, which can effectively shorten the total length of the imaging lens. When condition (5) is met: 90

VdG1+VdG3

At 107, it can effectively reduce chromatic aberration and improve image quality. When condition (6) is met: -3.9

(L1R1×L1R2)/(L2R1×L2R2)

When -0.05, the manufacturing sensitivity can be effectively reduced, which is beneficial to the production of imaging lenses. When condition (7) is met: 65

VdG31+VdG34

When 100, it can effectively reduce the dispersion value of the imaging lens. When conditions (1), (5) and (7) are met at the same time: -0.34 degrees/mm

FOV/f1

0.49 degrees/mm; 90

VdG1+VdG3

107; and 65

VdG31+VdG34

At 100, it can effectively reduce dispersion and improve image quality.

The first embodiment of the imaging lens of the present invention will now be described in detail. Please refer to Figure 1A, Figure 1B and Figure 1C. The imaging lens 1 includes a first lens group LG11, a second lens group LG12, a third lens group LG13, a fourth lens group LG14, and a filter. OF1 and a protective glass CG1. The first lens group LG11, the second lens group LG12, the third lens group LG13, the fourth lens group LG14, the filter OF1 and the protective glass CG1 are arranged in sequence from an object side to an image side along an optical axis OA1. The first lens group LG11 includes a 1-3 lens L110, a 1-1 lens L11 and a 1-2 lens L12. The 1-3 lens L110, the 1-1 lens L11 and the 1-2 lens L12 are along the optical axis. OA1 is arranged in order from the object side to the image side. The second lens group LG12 includes a 2-1 lens L13, a 2-2 lens L14 and a 2-3 lens L111. The 2-1 lens L13, 2-2 lens L14 and 2-3 lens L111 extend from the optical axis OA1 along the optical axis OA1. Arranged in order from object side to image side. The third lens group LG13 includes an aperture ST1, a 3-1 lens L15, a 3-2 lens L16, a 3-3 lens L17 and a 3-4 lens L18. The aperture ST1, 3-1 lens L15, 3-2 Lens L16, 3-3 lens L17, and 3-4 lens L18 are arranged in sequence from the object side to the image side along the optical axis OA1. The fourth lens group LG14 includes a 4-1 lens L19. During imaging, the light from the object side is finally imaged on an imaging plane IMA1.

When the imaging lens 1 zooms from the wide-angle end (as shown in Figure 1A) to the middle end (as shown in Figure 1B) and then to the telephoto end (as shown in Figure 1C), the first lens group LG11 is fixed. The second lens group LG12 moves toward the image side along the optical axis OA1, the third lens group LG13 moves toward the object side along the optical axis OA1, and the fourth lens group LG14 moves toward the image side along the optical axis OA1, so that the first lens group LG11 The distance between the second lens group LG12 and the second lens group LG12 becomes larger, the distance between the second lens group LG12 and the third lens group LG13 becomes smaller, and the distance between the third lens group LG13 and the fourth lens group LG14 becomes larger. The above distance increases with the imaging lens 1 The changes in zooming from the wide-angle end to the middle end and then to the telephoto end can be clearly seen in Figures 1A, 1B and 1C. When the imaging lens 1 of the first embodiment is zoomed from the wide-angle end (as shown in Figure 1A) to the telephoto end (as shown in Figure 1C), its zoom magnification is approximately 3 times (71.95221mm/24.04484mm≒2.99). The fourth lens group LG14 can move along the optical axis OA1 to focus the imaging lens 1 . According to the first to fifth paragraphs of [Embodiment], wherein: 1-3 lens L110 is a meniscus lens with negative refractive power and is made of glass. Its object side S11 is a convex surface, and the image side S12 is a concave surface. The object side S11 and The image side S12 is a spherical surface; 1-2 lens L12 is a meniscus lens, and its image side S16 is concave; 2-1 lens L13 is a meniscus lens, and its object side S17 is convex; 2-2 lens L14 is Meniscus lens with side image S110 It is concave; 2-3 Lens L111 is a meniscus lens with positive refractive power and is made of glass. Its object side S111 is convex, the image side S112 is concave, and both the object side S111 and the image side S112 are spherical surfaces; 3- 2 Lens L16 is a biconvex lens with a convex image side S117; 4-1 lens L19 is a meniscus lens with a concave image side S123; filter OF1 has a flat object side S124 and image side S125; protective glass The object side S126 and the image side S127 of CG1 are both flat surfaces; using the above-mentioned lens, aperture ST1 and a design that satisfies at least one of conditions (1) to (7), the imaging lens 1 can effectively shorten the total length of the lens and effectively Improved resolution, effective correction of aberrations and optical zoom function.

Table 1 is a table of relevant parameters of each lens when the imaging lens 1 in Figure 1A, Figure 1B, and Figure 1C is at the wide-angle end, the intermediate end, and the telephoto end respectively.

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

In addition, the optical performance of the imaging lens 1 of the first embodiment can also meet the requirements. It can be seen from Figure 2A that the longitudinal aberration of the imaging lens 1 of the first embodiment at the wide-angle end is between -0.005mm and 0mm. It can be seen from Figure 2B that the field curvature of the imaging lens 1 of the first embodiment at the wide-angle end is between -0.04mm and 0.01mm. As can be seen from Figure 2C, the first embodiment The distortion of the imaging lens 1 at the wide-angle end is between -2% and 0%. It can be seen from Figure 3A that the imaging lens 1 of the first embodiment has a longitudinal aberration between -0.005mm and 0.01mm at the middle end. It can be seen from Figure 3B that the field curvature of the imaging lens 1 of the first embodiment is between -0.02mm and 0.01mm at the middle end. It can be seen from Figure 3C that the distortion of the imaging lens 1 of the first embodiment is between 0% and 2% at the middle end. It can be seen from Figure 4A that the longitudinal aberration of the imaging lens 1 of the first embodiment at the telephoto end is between -0.025mm and -0.005mm. It can be seen from Figure 4B that the field curvature of the imaging lens 1 of the first embodiment is between -0.01mm and 0.02mm at the telephoto end. It can be seen from Figure 4C that the distortion of the imaging lens 1 of the first embodiment at the telephoto end is between 0% and 2%0. It is obvious that the longitudinal aberration, field curvature and distortion of the imaging lens 1 of the first embodiment can be effectively corrected, thereby obtaining better optical performance.

The second embodiment of the imaging lens of the present invention will now be described in detail. Please refer to Figure 5A, Figure 5B and Figure 5C. The imaging lens 2 includes a first lens group LG21, a second lens group LG22, a third lens group LG23, a fourth lens group LG24, and a filter. OF2 and a protective glass CG2. The first lens group LG21, the second lens group LG22, the third lens group LG23, the fourth lens group LG24, the filter OF2 and the protective glass CG2 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 and a 1-2 lens L22. The 1-1 lens L21 and the 1-2 lens L22 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 L23 and a 2-2 lens L24. The 2-1 lens L23 and the 2-2 lens L24 are arranged in sequence from the object side to the image side along the optical axis OA2. The third lens group LG23 includes an aperture ST2, a 3-1 lens L25, a 3-2 lens L26, a 3-3 lens L27 and a 3-4 lens L28. The aperture ST2, 3-1 lens L25, 3-2 Lens L26, 3-3 lens L27, and 3-4 lens L28 are arranged in sequence from the object side to the image side along the optical axis OA2. The fourth lens group LG24 includes a 4-2 lens L210 and A 4-1 lens L29, a 4-2 lens L210 and a 4-1 lens L29 are arranged in sequence from the object side to the image side along the optical axis OA2. During imaging, the light from the object side is finally imaged on an imaging plane IMA2.

When the imaging lens 2 zooms from the wide-angle end (as shown in Figure 5A) to the middle end (as shown in Figure 5B) and then to the telephoto end (as shown in Figure 5C), the first lens group LG21 is fixed. The second lens group LG22 moves toward the image side along the optical axis OA2, the third lens group LG23 moves toward the object side along the optical axis OA2, and the fourth lens group LG24 moves toward the image side along the optical axis OA2, so that the first lens group LG21 The distance between the second lens group LG22 and the second lens group LG22 becomes larger, the distance between the second lens group LG22 and the third lens group LG23 becomes smaller, and the distance between the third lens group LG23 and the fourth lens group LG24 becomes larger. The above distance increases with the imaging lens 2 The change in zooming from the wide-angle end to the middle end and then to the telephoto end can be clearly seen in Figures 5A, 5B and 5C. When the imaging lens 2 of the second embodiment is zoomed from the wide-angle end (as shown in Figure 5A) to the telephoto end (as shown in Figure 5C), its zoom magnification is approximately 3 times (71.9346mm/24.07183mm≒2.99). The fourth lens group LG24 can move along the optical axis OA2 to focus the imaging lens 2 . According to the first to fifth paragraphs of [Embodiment], wherein: 1-2 lens L22 is a meniscus lens, and its image side S24 is a concave surface; 2-1 lens L23 is a meniscus lens, and its object side S25 is a convex surface; 2 -2 lens L24 is a meniscus lens, and its image side S28 is convex; 3-2 lens L26 is a meniscus lens, and its image side S213 is concave; 4-2 lens L210 is a meniscus lens with negative refractive power. Made of glass material, its object side S218 is concave, image side S219 is convex, both object side S218 and image side S219 are spherical surfaces; 4-1 lens L29 is a biconvex lens, and its image side S221 is convex; filter OF2 The object side S222 and the image side S223 are both flat; the object side S224 and the image side S225 of the protective glass CG2 are both flat; use the above lens, aperture ST2 and a design that satisfies at least one of the conditions (1) to (7) , so that the imaging lens 2 can effectively shorten the total length of the lens, effectively improve the resolution, and effectively repair the lens. Positive aberration and realize optical zoom function.

Table 3 is a table of relevant parameters of each lens when the imaging lens 2 in Figure 5A, Figure 5B, and Figure 5C is at the wide-angle end, the intermediate end, and the telephoto end respectively.

Table 4 shows the relevant parameter values of the imaging lens 2 of the second embodiment and the calculated values corresponding to conditions (1) to (7). From Table 4, it can be seen that the imaging lens 2 of the second embodiment can all satisfy the condition (1). ) to the requirements of condition (7).

In addition, the optical performance of the imaging lens 2 of the second embodiment can also meet the requirements. It can be seen from Figure 6A that the longitudinal aberration of the imaging lens 2 of the second embodiment at the wide-angle end is between -0.005mm and 0.025mm. It can be seen from Figure 6B that the field curvature of the imaging lens 2 of the second embodiment is between 0mm and 0.02mm at the wide-angle end. It can be seen from Figure 6C that the distortion of the imaging lens 2 of the second embodiment is between -1% and 0% at the wide-angle end. It can be seen from Figure 7A that the longitudinal aberration of the imaging lens 2 of the second embodiment at the middle end is between -0.01mm and 0.015mm. It can be seen from Figure 7B that the field curvature of the imaging lens 2 of the second embodiment is between -0.01mm and 0.01mm at the middle end. It can be seen from Figure 7C that the distortion of the imaging lens 2 of the second embodiment is between 0% and 1% at the middle end. It can be seen from Figure 8A that the longitudinal aberration of the imaging lens 2 of the second embodiment at the telephoto end is between -0.015mm and 0.03mm. It can be seen from Figure 8B that the field curvature of the imaging lens 2 of the second embodiment is between -0.02mm and 0.01mm at the telephoto end. Depend on It can be seen from Figure 8C that the distortion of the imaging lens 2 of the second embodiment is between 0% and 1% at the telephoto end. It is obvious that the longitudinal aberration, field curvature, and distortion of the imaging lens 2 of the second embodiment can be effectively corrected, thereby obtaining better optical performance.

The third embodiment of the imaging lens of the present invention will now be described in detail. Please refer to Figure 9A, Figure 9B and Figure 9C. The imaging lens 3 includes a first lens group LG31, a second lens group LG32, a third lens group LG33, a fourth lens group LG34, and a filter. OF3 and a protective glass CG3. The first lens group LG31, the second lens group LG32, the third lens group LG33, the fourth lens group LG34, the filter OF3 and the protective glass CG3 are arranged in sequence from an object side to an image side along an optical axis OA3. The first lens group LG21 includes a 1-3 lens L310, a 1-1 lens L31 and a 1-2 lens L32. The 1-3 lens L310, the 1-1 lens L31 and the 1-2 lens L32 extend from the optical axis OA3 along the optical axis OA3. Arranged in order from object side to image side. The second lens group LG32 includes a 2-1 lens L33 and a 2-2 lens L34. The 2-1 lens L33 and the 2-2 lens L34 are arranged in sequence from the object side to the image side along the optical axis OA3. The third lens group LG33 includes an aperture ST3, a 3-1 lens L35, a 3-2 lens L36, a 3-3 lens L37 and a 3-4 lens L38. The aperture ST3, 3-1 lens L35, 3-2 Lens L36, 3-3 lens L37 and 3-4 lens L38 are arranged in sequence from the object side to the image side along the optical axis OA3. The fourth lens group LG34 includes a 4-1 lens L39. During imaging, the light from the object side is finally imaged on an imaging plane IMA3.

When the imaging lens 3 zooms from the wide-angle end (as shown in Figure 9A) to the middle end (as shown in Figure 9B) and then to the telephoto end (as shown in Figure 9C), the first lens group LG31 is fixed. The second lens group LG32 moves toward the image side along the optical axis OA3, the third lens group LG33 moves toward the object side along the optical axis OA3, and the fourth lens group LG34 moves toward the image side along the optical axis OA3, so that the first lens group LG31 The distance between the second lens group LG32 and the second lens group LG32 becomes larger, and the distance between the second lens group LG32 and the third lens group LG32 becomes larger. The distance between the lens group LG33 becomes smaller, and the distance between the third lens group LG33 and the fourth lens group LG34 becomes larger. The above distance changes as the imaging lens 3 zooms from the wide-angle end to the middle end and then to the telephoto end. This is clearly seen in Figure 9A, Figure 9B and Figure 9C. When the imaging lens 3 of the third embodiment zooms from the wide-angle end (as shown in Figure 9A) to the telephoto end (as shown in Figure 9C), its zoom magnification is approximately 3 times (71.9813mm/24.03277mm≒3.00). The fourth lens group LG34 can move along the optical axis OA3 to focus the imaging lens 3 . According to the first to fifth paragraphs of [Embodiment], wherein: 1-3 lens L310 is a meniscus lens with negative refractive power and is made of glass material. The object side S31 is a convex surface, the image side S32 is a concave surface, and the object side S31 and The image side S32 is a spherical surface; the 1-2 lens L32 is a biconvex lens, and its image side S36 is a convex surface; the 2-1 lens L33 is a biconcave lens, and its object side S37 is a concave surface; the 2-2 lens L34 is a biconcave lens, and its object side S37 is a concave surface. The image side S310 is a concave surface; the 3-2 lens L36 is a biconvex lens, and its image side S315 is a convex surface; the 4-1 lens L39 is a meniscus lens, and its image side S321 is a concave surface; the object side S322 of the filter OF3 is in line with the image side. The side S323 of the protective glass CG3 is both flat; the object side S324 and the image side S325 of the protective glass CG3 are both flat; using the above lens, aperture ST3 and a design that meets 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 correct aberrations and realize the optical zoom function.

Table 5 is a table of relevant parameters of each lens when the imaging lens 3 in Figures 9A, 9B, and 9C is at the wide-angle end, the intermediate end, and the telephoto end respectively.

Table 6 shows the relevant parameter values of the imaging lens 3 of the third embodiment and the calculated values corresponding to conditions (1) to (7). From Table 6, it can be seen that the imaging lens 3 of the third embodiment can satisfy the condition (1). ) to the requirements of condition (7).

In addition, the optical performance of the imaging lens 3 of the third embodiment can also meet the requirements. It can be seen from Figure 10A that the longitudinal aberration of the imaging lens 3 of the third embodiment at the wide-angle end is between -0.015mm and 0.02mm. It can be seen from Figure 10B that the field curvature of the imaging lens 3 of the third embodiment is between -0.01mm and 0.03mm at the wide-angle end. It can be seen from Figure 10C that the distortion of the imaging lens 3 of the third embodiment is between 0% and 1% at the wide-angle end. It can be seen from Figure 11A that the longitudinal aberration of the imaging lens 3 of the third embodiment at the middle end is between -0.015mm and 0.02mm. It can be seen from Figure 11B that the field curvature of the imaging lens 3 of the third embodiment is between -0.05mm and 0.01mm at the middle end. It can be seen from Figure 11C that the distortion of the imaging lens 3 of the third embodiment is between 0% and 2% at the middle end. It can be seen from Figure 12A that the longitudinal aberration of the imaging lens 3 of the third embodiment at the telephoto end is between -0.03mm and 0.01mm. It can be seen from Figure 12B that the field curvature of the imaging lens 3 of the third embodiment is between -0.03mm and -0.01mm at the telephoto end. It can be seen from Figure 12C that the distortion of the imaging lens 3 of the third embodiment is between 0% and 2% at the telephoto end. It is obvious that the longitudinal aberration, field curvature, and distortion of the imaging lens 3 of the third embodiment can be effectively corrected, thereby obtaining better optical performance.

In addition to being used in surveillance cameras, the above-mentioned imaging lenses can also be used in automobile advanced driving assistance systems. Especially in environments with poor visibility at night or on rainy days, clear images of the outside of the car can still be captured for driver reference to improve driving safety. . In addition, a sight is generally composed of an objective lens group, an upright lens group and an eyepiece group. The above-mentioned imaging lens can also be used directly as a sight to capture clear images of distant targets, or as an objective lens group in combination with other upright lenses. lens group and the eyepiece group forming a sight should also fall within the scope of the present invention.

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

LG11: First lens group

LG12: Second lens group

LG13: Third lens group

LG14: Fourth lens group

OF1: filter

CG1: Protective glass

IMA1: Imaging plane

OA1: optical axis

L11 1-1: Lens

L12 1-2: Lens

L13 2-1: Lens

L14 2-2: Lens

L15 3-1: Lens

L16 3-2: Lens

L17 3-3: Lens

L18 3-4: Lens

L19 4-1: Lens

L110 1-3: Lens

L111 2-3: Lens

ST1: Aperture

S11 1-3: Lens object side

S12 1-3: Lens image side

S13 1-1: Lens object side

S14 1-1: Lens image side

S15 1-2: Lens object side

S16 1-2: Lens image side

S17 2-1: Lens object side

S18 2-1: Lens image side

S19 2-2: Lens object side

S110 2-2: Lens image side

S111 2-3: Lens object side

S112 2-3: Lens image side

S113: Aperture surface

S114 3-1: Lens object side

S115 3-1: Lens image side

S116 3-2: Lens object side

S117 3-2: Lens image side

S118 3-3: Lens object side

S119 3-3: Lens image side

S120 3-4: Lens object side

S121 3-4: Lens image side

S122 4-1: Lens object side

S123 4-1: Lens image side

S124: Filter object side

S125: Filter image side

S126: Protect the sides of glass objects

S127: Protective glass side

Claims (10)

An imaging lens including: a first lens group, the first lens group has positive refractive power; a second lens group, the second lens group has negative refractive power, and the second lens group includes at least two lenses with negative refractive power; A third lens group, the third lens group has positive refractive power, the third lens group includes a 3-1 lens, a 3-2 lens and a 3-3 lens, the 3-1 lens has positive refractive power, the 3 -3 The lens includes a concave surface facing an object side; and a fourth lens group, the fourth lens group has positive refractive power; The first lens group, the second lens group, the third lens group and the fourth lens group are arranged in sequence along an optical axis from the object side to an image side; The 3-1 lens, the 3-2 lens and the 3-3 lens are arranged in sequence from the object side to the image side along the optical axis, and the lenses are adjacent to each other. The imaging lens as described in item 1 of the patent application scope, wherein: The first lens group includes a 1-1 lens and a 1-2 lens. 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 1-1 lens is a biconvex lens with positive refractive power. 2. The lens has positive refractive power and includes a convex surface facing the object side; The second lens group includes a 2-1 lens and a 2-2 lens. The 2-1 lens has negative refractive power and includes a concave surface facing the image side. The 2-2 lens has negative refractive power and includes a concave surface facing the object. side; side The third lens group further includes a 3-4 lens disposed between the 3-3 lens and the fourth lens group. The 3-1 lens is a biconvex lens and includes a convex surface facing the object side and another convex surface facing the object side. the On the image side, the 3-2 lens has positive refractive power and includes a convex surface facing the object side. The 3-3 lens is a biconcave lens with negative refractive power and further includes another concave surface facing the image side. The 3-4 lens is curved. The moon-shaped lens has negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side; The fourth lens group includes a 4-1 lens, the 4-1 lens has positive refractive power and includes a convex surface facing the object side; The 1-1 lens and the 1-2 lens are arranged sequentially along the optical axis from the object side to the image side; 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. As for the imaging lens described in item 2 of the patent application, the fourth lens group further includes a 4-2 lens disposed between the third lens group and the 4-1 lens, wherein: The 1-2 lens is a meniscus lens, and further includes a concave surface facing the image side; The 2-1 lens is a meniscus lens and further includes a convex surface facing the object side; The 2-2 lens is a meniscus lens and further includes a convex surface facing the image side; The 3-2 lens is a meniscus lens and further includes a concave surface facing the image side; The 4-1 lens is a biconvex lens and further includes another convex surface facing the image side; and The 4-2 lens is a meniscus lens with negative refractive power and includes a concave surface facing the object side and a convex surface facing the image side. As for the imaging lens described in item 2 of the patent application, the first lens group further includes a 1-3 lens disposed between the object side and the 1-1 lens, wherein: The 3-2 lens is a biconvex lens and further includes another convex surface facing the image side; The 4-1 lens is a meniscus lens and further includes a concave surface facing the image side; and The 1-3 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 imaging lens as described in item 4 of the patent application scope, wherein: The 1-2 lens is a biconvex lens and further includes another convex surface facing the image side; The 2-1 lens is a biconcave lens and further includes another concave surface facing the object side; and The 2-2 lens is a biconcave lens and further includes another concave surface facing the image side. As for the imaging lens described in item 4 of the patent application, the second lens group further includes a 2-3 lens disposed between the 2-2 lens and the third lens group, wherein: The 1-2 lens is a meniscus lens and further includes a concave surface facing the image side; The 2-1 lens is a meniscus lens and further includes a convex surface facing the object side; The 2-2 lens is a meniscus lens and further includes a convex surface facing the image side; and The 2-3 lens is a meniscus lens with positive refractive power and includes a convex surface facing the object side and a concave surface facing the image side. In the imaging lens described in claim 1 of the patent application, the third lens group further includes an aperture disposed between the second lens group and the 3-1 lens. The imaging lens as described in Item 1 of the patent application, wherein the distance between the lens groups can be changed along the optical axis, so that the imaging lens can zoom from a wide-angle end to an intermediate end and then to a telephoto end to change the focal length. , the fourth lens group can move along the optical axis to focus. The imaging lens as described in item 1 of the patent application scope, wherein the imaging lens meets at least one of the following conditions: -0.34 degrees/mm

FOV/f1

0.49 degrees/mm; -0.36

fG1/f1

0.68; -0.13

fG2/fG23

0.55; 18

TTL/TG34

74; Among them, FOV is the maximum field of view of one of the imaging lenses, f1 is the effective focal length of one of the lenses closest to the object side, fG1 is the effective focal length of one of the first lens groups, and fG2 is the effective focal length of one of the second lens groups. Focal length, fG23 is the effective focal length of the lens in the second lens group closest to the image side, TTL is the object side of the lens in the first lens group closest to the object side to an imaging plane along the The distance between the optical axis, TG34, is the thickness of the lens closest to the image side in the third lens group along the optical axis. The imaging lens as described in item 1 of the patent application scope, wherein the imaging lens meets at least one of the following conditions: 90

VdG1+VdG3

107; -3.9

(L1R1×L1R2)/(L2R1×L2R2)

-0.05; 65

VdG31+VdG34

100; Among them, VdG1 is the average Abbe coefficient of all the lenses in the first lens group, VdG3 is the average Abbe coefficient of all the lenses in the third lens group, and L1R1 is the object side of the lens closest to the object side. A radius of curvature, L1R2 is the radius of curvature of the image side of the lens closest to the object side, L2R1 is the radius of curvature of the object side of the lens second closest to the object side, L2R2 is the radius of curvature of the object side of the lens second closest to the object side The radius of curvature of an image side of the lens on the object side, VdG31 is the Abbe coefficient of the lens closest to the object side in the third lens group, VdG34 is the Abbe coefficient of the lens closest to the image side in the third lens group The Abbe coefficient of a lens.

Images