TWI874174B - Lens assembly - Google Patents

Abstract

A lens assembly includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth length, and a seventh lens. The first lens is with positive refractive power. The second lens is with refractive power. The third lens is with negative refractive power. The fourth lens is with positive refractive power and includes a convex surface facing an image side. The fifth lens is with refractive power and includes a concave surface facing an object side. The sixth lens is with refractive power. The seventh lens is with refractive power and includes a convex surface facing the object side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are arranged in order from the object side to the image side along an optical axis.

Description

Imaging lens (80)

The present invention relates to an imaging lens.

The development trend of imaging lenses today is not only continuously developing towards high resolution, but also needs to have low distortion characteristics in line with different application requirements. Conventional imaging lenses can no longer meet current requirements, and another imaging lens with a new structure is needed to meet the requirements of high resolution and low distortion at the same time.

In view of this, the main purpose of the present invention is to provide an imaging lens with higher resolution and lower distortion, but still with good optical performance.

The present invention provides an imaging lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The first lens has positive refractive power. The second lens has refractive power. The third lens has negative refractive power. The fourth lens has positive refractive power and includes a convex surface facing an image side. The fifth lens has refractive power and includes a concave surface facing an object side. The sixth lens has refractive power. The seventh lens has refractive power and includes a convex surface facing the object side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence along an optical axis from the object side to the image side. When the imaging lens of the present invention meets the above characteristics and does not require other additional characteristics or conditions, the basic function of the imaging lens of the present invention can be achieved.

The present invention provides another imaging lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The first lens has positive refractive power. The second lens has refractive power. The third lens has negative refractive power. The fourth lens has positive refractive power and includes a convex surface facing an image side. The fifth lens has refractive power and includes a concave surface facing an object side. The sixth lens has refractive power and includes a convex surface facing the object side. The seventh lens has refractive power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence along an optical axis from the object side to the image side. When the imaging lens of the present invention meets the above characteristics and does not require other additional characteristics or conditions, the basic function of the imaging lens of the present invention can be achieved.

The present invention provides another imaging lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The first lens has positive refractive power. The second lens has refractive power. The third lens has negative refractive power. The fourth lens has positive refractive power and includes a convex surface facing an image side. The fifth lens has refractive power and includes a concave surface facing an object side. The sixth lens has refractive power and includes a convex surface facing the image side. The seventh lens has refractive power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence along an optical axis from the object side to the image side. When the imaging lens of the present invention meets the above characteristics and does not require other additional characteristics or conditions, the basic function of the imaging lens of the present invention can be achieved.

The present invention provides another imaging lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The first lens has positive refractive power. The second lens has refractive power and includes a convex surface facing an object side. The third lens has negative refractive power. The fourth lens has positive refractive power and includes a convex surface facing an image side. The fifth lens has refractive power and includes a concave surface facing the object side. The sixth lens has refractive power. The seventh lens has refractive power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence along an optical axis from the object side to the image side. When the imaging lens of the present invention meets the above characteristics and does not require other additional characteristics or conditions, the basic function of the imaging lens of the present invention can be achieved.

The present invention provides another imaging lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The first lens has positive refractive power. The second lens has refractive power. The third lens has refractive power and includes a concave surface facing an image side. The fourth lens has positive refractive power and includes a convex surface facing the image side. The fifth lens has refractive power and includes a concave surface facing an object side. The sixth lens has positive refractive power. The seventh lens has refractive power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence along an optical axis from the object side to the image side. When the imaging lens of the present invention meets the above characteristics and does not require other additional characteristics or conditions, the basic function of the imaging lens of the present invention can be achieved.

The present invention provides another imaging lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The first lens has positive refractive power. The second lens has refractive power. The third lens has refractive power. The fourth lens has positive refractive power and includes a convex surface facing an image side. The fifth lens is a meniscus lens with refractive power, and includes a concave surface facing an object side and a convex surface facing the image side. The sixth lens has positive refractive power. The seventh lens has refractive power. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence along an optical axis from the object side to the image side. When the imaging lens of the present invention meets the above characteristics and does not require other additional characteristics or conditions, the basic function of the imaging lens of the present invention can be achieved.

The present invention provides another imaging lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens. The first lens has positive refractive power. The second lens has refractive power. The third lens has refractive power. The fourth lens has positive refractive power and includes a convex surface facing an image side. The fifth lens has refractive power and includes a concave surface facing an object side. The sixth lens has positive refractive power. The seventh lens has refractive power and includes a convex surface facing the image side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence along an optical axis from the object side to the image side. When the imaging lens of the present invention meets the above characteristics and does not require other additional characteristics or conditions, the basic function of the imaging lens of the present invention can be achieved.

The first lens is a meniscus lens and includes a convex surface facing the object side and a concave surface facing the image side. The second 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 third lens is a meniscus lens and includes a convex surface facing the object side and a concave surface facing the image side. The fourth lens is a double convex lens and can be changed to The fifth lens is a meniscus lens with negative refractive power and may further include a convex surface facing the image side. The sixth 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 seventh 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 imaging lens of the present invention may further include an eighth lens and a ninth lens disposed between the seventh lens and the image side, wherein the first lens is a meniscus lens and includes a convex surface facing the object side and a concave surface facing the image side, the second lens is a meniscus lens having negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side, the third lens is a meniscus lens and includes a convex surface facing the object side and a concave surface facing the image side, the fourth lens is a meniscus lens and may further include a concave surface facing the object side, the fifth lens is a meniscus lens The type lens has positive refractive power and may further include a convex surface facing the image side, the sixth 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 seventh 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 eighth lens is a biconcave lens with negative refractive power and includes a concave surface facing the object side and another concave surface facing the image side, and the ninth 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.

f7/f

1.94；0.8

|f4/f5|

1.2；0.4

|f6/f5|

1.3；4.8

R12/T1

6.2；-4.9

R62/T6

-4.3；3

|R41/R42|

5.7；0.6

(R12-R11)/(R21-R22)

2.2；-0.27

(R11-R12)/TTL

-0.16；5

TTL/BFL

10；0.2

Vd4/Vd5

3.1；其中f為該成像鏡頭之一有效焦距，f4為該第四透鏡之一有效焦距，f5為該第五透鏡之一有效焦距，f6為該第六透鏡之一有效焦距，f7為該第七透鏡之一有效焦距，R11為該第一透鏡之一物側面之一曲率半徑，R12為該第一透鏡之一像側面之一曲率半徑，R21為該第二透鏡之一物側面之一曲率半徑，R22為該第二透鏡之一像側面之一曲率半徑，R41為該第四透鏡之一物側面之一曲率半徑，R42為該第四透鏡之一像側面之一曲率半徑，R62為該第六透鏡之一像側面之一曲率半徑，T1為該第一透鏡之該物側至該第一透鏡之該像側面於該光軸上之一間距，T6為該第六透鏡之一物側至該第六透鏡之該像側 面於該光軸上之一間距，TTL為該第一透鏡之該物側面至一成像面於該光軸上之一間距，BFL為最靠近該成像面的透鏡之一像側面至該成像面於該光軸上之一間距，Vd4為該第四透鏡之一阿貝係數，Vd5為該第五透鏡之一阿貝係數。 The imaging lens satisfies at least one of the following conditions: 1.56

f7/f

1.94; 0.8

|f4/f5|

1.2; 0.4

|f6/f5|

1.3; 4.8

R12/T1

6.2; -4.9

R62/T6

-4.3; 3

|R41/R42|

5.7; 0.6

(R12-R11)/(R21-R22)

2.2; -0.27

(R11-R12)/TTL

-0.16;5

TTL/BFL

10; 0.2

Vd4/Vd5

3.1; wherein f is an effective focal length of the imaging lens, f4 is an effective focal length of the fourth lens, f5 is an effective focal length of the fifth lens, f6 is an effective focal length of the sixth lens, f7 is an effective focal length of the seventh lens, R11 is a radius of curvature of an object side surface of the first lens, R12 is a radius of curvature of an image side surface of the first lens, R21 is a radius of curvature of an object side surface of the second lens, R22 is a radius of curvature of an image side surface of the second lens, R41 is a radius of curvature of an object side surface of the fourth lens, and R42 is a radius of curvature of the fourth lens. R62 is a radius of curvature of an image side surface of the sixth lens, T1 is a distance from the object side of the first lens to the image side surface of the first lens on the optical axis, T6 is a distance from an object side of the sixth lens to the image side surface of the sixth lens on the optical axis, TTL is a distance from the object side surface of the first lens to an imaging plane on the optical axis, BFL is a distance from an image side surface of the lens closest to the imaging plane to the imaging plane on the optical axis, Vd4 is an Abbe coefficient of the fourth lens, and Vd5 is an Abbe coefficient of the fifth lens.

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

1, 2, 3, 4: Imaging lenses

L11, L21, L31, L41: First lens

L12, L22, L32, L42: Second lens

L13, L23, L33, L43: Third lens

L14, L24, L34, L44: Fourth lens

L15, L25, L35, L45: Fifth lens

L16, L26, L36, L46: Sixth lens

L17, L27, L37, L47: Seventh lens

L48: Eighth lens

L49: Ninth lens

ST1, ST2, ST3, ST4: aperture

IMA1, IMA2, IMA3, IMA4: imaging surface

OA1, OA2, OA3, OA4: optical axis

S11, S21, S31, S41: Object side of the first lens

S12, S22, S32, S42: first lens image side

S13, S23, S33, S43: Second lens object side

S14, S24, S34, S44: Second lens image side

S15, S25, S35, S45: Third lens object side

S16, S26, S36, S46: Third lens image side

S17, S27, S37, S49: aperture surface

S18, S28, S38, S47: fourth lens object side

S19, S29, S39, S48: Fourth lens image side

S110, S210, S310, S410: Fifth lens object side

S111, S211, S311, S411: Fifth lens image side

S112, S212, S312, S412: sixth lens object side

S113, S213, S313, S413: Sixth lens image side

S114, S214, S314, S414: seventh lens object side

S115, S215, S315, S415: seventh lens image side

S416: Eighth lens object side

S417: Side view of the eighth lens

S418: Object side of the ninth lens

S419: Ninth lens image side view

S116, S216, S316, S420: Object side of filter

S117, S217, S317, S421: filter image side

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

Figures 2, 3, 4, and 5 are respectively the field curvature diagram, distortion diagram, modulation transfer function diagram, and through focus modulation transfer function diagram of the first embodiment of the imaging lens of the present invention.

Figure 6 is a schematic diagram of the lens configuration and optical path of the second embodiment of the imaging lens of the present invention.

Figures 7, 8, 9, and 10 are respectively the field curvature diagram, distortion diagram, modulation transfer function diagram, and defocus modulation transfer function diagram of the second embodiment of the imaging lens of the present invention.

Figure 11 is a schematic diagram of the lens configuration and optical path of the third embodiment of the imaging lens of the present invention.

Figure 12 is a schematic diagram of the lens configuration and optical path of the fourth embodiment of the imaging lens of the present invention.

Figures 13, 14, 15, and 16 are respectively field curvature diagrams, distortion diagrams, modulation transfer function diagrams, and defocus modulation transfer function diagrams of the fourth embodiment of the imaging lens of the present invention.

The present invention provides an imaging lens, comprising: a first lens having positive refractive power; a second lens having refractive power; a third lens having negative refractive power; a fourth lens having positive refractive power, the fourth lens including a convex surface facing an image side; a fifth lens having refractive power, the fifth lens including a concave surface facing an object side; a sixth lens having refractive power; and a seventh lens having refractive power, the seventh lens including a convex surface facing the object side; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence along an optical axis from the object side to the image side. When the imaging lens of the present invention satisfies the above characteristics, it is a preferred embodiment of the present invention.

The present invention provides another imaging lens, comprising: a first lens having positive refractive power; a second lens having refractive power; a third lens having negative refractive power; a fourth lens having positive refractive power, the fourth lens including a convex surface facing an image side; a fifth lens having refractive power, the fifth lens including a concave surface facing an object side; a sixth lens having refractive power, the sixth lens including a convex surface facing the object side; and a seventh lens having refractive power; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence from the object side to the image side along an optical axis. When the imaging lens of the present invention satisfies the above characteristics, it is a preferred embodiment of the present invention.

The present invention provides another imaging lens, comprising: a first lens having positive refractive power; a second lens having refractive power; a third lens having negative refractive power; a fourth lens having positive refractive power, the fourth lens including a convex surface facing an image side; a fifth lens having refractive power, the fifth lens including a concave surface facing an object side; a sixth lens having refractive power, the sixth lens including a convex surface facing the image side; and a seventh lens having refractive power; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence from the object side to the image side along an optical axis. When the imaging lens of the present invention satisfies the above characteristics, it is a preferred embodiment of the present invention.

The present invention provides another imaging lens, comprising: a first lens having positive refractive power; a second lens having refractive power, the second lens including a convex surface facing an object side; a third lens having negative refractive power; a fourth lens having positive refractive power, the fourth lens including a convex surface facing an image side; a fifth lens having refractive power, the fifth lens including a concave surface facing the object side; a sixth lens having refractive power; and a seventh lens having refractive power; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence along an optical axis from the object side to the image side. When the imaging lens of the present invention satisfies the above characteristics, it is a preferred embodiment of the present invention.

The present invention provides another imaging lens, comprising: a first lens having positive refractive power; a second lens having refractive power; a third lens having refractive power, the third lens including a concave surface facing an image side; a fourth lens having positive refractive power, the fourth lens including a convex surface facing the image side; a fifth lens having refractive power, the fifth lens including a concave surface facing an object side; a sixth lens having positive refractive power; and a seventh lens having refractive power; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence along an optical axis from the object side to the image side. When the imaging lens of the present invention satisfies the above characteristics, it is a preferred embodiment of the present invention.

The present invention provides another imaging lens, comprising: a first lens having positive refractive power; a second lens having refractive power; a third lens having refractive power; a fourth lens having positive refractive power, the fourth lens including a convex surface facing an image side; a fifth lens having refractive power, the fifth lens being a meniscus lens and including a concave surface facing an object side and a convex surface facing the image side; a sixth lens having positive refractive power; and a seventh lens having refractive power; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence from the object side to the image side along an optical axis. When the imaging lens of the present invention satisfies the above characteristics, it is a preferred embodiment of the present invention.

The present invention provides another imaging lens, comprising: a first lens having positive refractive power; a second lens having refractive power; a third lens having refractive power; a fourth lens having positive refractive power, the fourth lens including a convex surface facing an image side; a fifth lens having refractive power, the fifth lens including a concave surface facing an object side; a sixth lens having positive refractive power; and a seventh lens having refractive power, the seventh lens including a convex surface facing the image side; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence along an optical axis from the object side to the image side. When the imaging lens of the present invention satisfies the above characteristics, it is a preferred embodiment of the present invention.

Please refer to Table 1, Table 2, Table 4, Table 5, Table 7, Table 8, Table 10 and Table 11 below, wherein Table 1, Table 4, Table 7 and Table 10 are respectively tables of relevant parameters of each lens of the first embodiment to the fourth embodiment of the imaging lens according to the present invention, and Table 2, Table 5, Table 8 and Table 11 are respectively tables of relevant parameters of the aspherical surface of the aspherical lens in Table 1, Table 4, Table 7 and Table 10. In the following embodiments, the aspheric surface concavity z of the aspheric lens is obtained by the following formula: z=ch ² /{1+[1-(k+1)c ² h ² ] ^1/2 }+Ah ⁴ +Bh ⁶ +Ch 8 +Dh ¹⁰ +Eh ¹² +Fh ¹⁴ , wherein: c is the curvature, h is the vertical distance from any point on the lens surface to ^the optical axis, k is the conic constant, A~F are the aspheric coefficients, and the aspheric coefficients can be expressed in scientific notations, for example, 2.00E-03 represents 2.00×10 ^-3 .

Figures 1, 6, 11, and 12 are respectively schematic diagrams of the lens configuration and optical path of the first, second, third, and fourth embodiments of the imaging lens of the present invention. The first lens L11, L21, L31, and L41 are meniscus lenses with positive refractive power, and their object side surfaces S11, S21, S31, and S41 are convex surfaces, and the image side surfaces S12, S22, S32, and S42 are concave surfaces. The object side surfaces S11, S21, S31, and S41 and the image side surfaces S12, S22, S32, and S42 are all spherical surfaces.

The second lenses L12, L22, L32, and L42 are meniscus lenses with negative refractive power. The object side surfaces S13, S23, S33, and S43 are convex, and the image side surfaces S14, S24, S34, and S44 are concave. The object side surfaces S13, S23, S33, and S43 and the image side surfaces S14, S24, S34, and S44 are all spherical surfaces.

The third lenses L13, L23, L33, and L43 are meniscus lenses with negative refractive power, and their object side surfaces S15, S25, S35, and S45 are convex, and their image side surfaces S16, S26, S36, and S46 are concave.

The fourth lens L14, L24, L34, L44 has positive refractive power, and its image side surfaces S19, S29, S39, S48 are convex surfaces, and the object side surfaces S18, S28, S38, S47 and the image side surfaces S19, S29, S39, S48 are all spherical surfaces.

The fifth lenses L15, L25, L35, and L45 are meniscus lenses, whose object side surfaces S110, S210, S310, and S410 are concave surfaces, and image side surfaces S111, S211, S311, and S411 are convex surfaces.

The sixth lens L16, L26, L36, L46 is a biconvex lens with positive refractive power, and its object side surfaces S112, S212, S312, S412 are convex surfaces, and the image side surfaces S113, S213, S313, S413 are convex surfaces. The object side surfaces S112, S212, S312, S412 and the image side surfaces S113, S213, S313, S413 are all spherical surfaces.

The seventh lens L17, L27, L37, L47 is a biconvex lens with positive refractive power, and its object side surfaces S114, S214, S314, S414 are convex, and the image side surfaces S115, S215, S315, S415 are convex. The object side surfaces S114, S214, S314, S414 and the image side surfaces S115, S215, S315, S415 are all aspherical surfaces.

In addition, imaging lenses 1, 2, 3, and 4 satisfy at least one of the following conditions (1) to (10):

Among them, the important parameters in the first to fourth embodiments are defined as follows: f is an effective focal length of the imaging lenses 1, 2, 3, 4, f4 is an effective focal length of the fourth lens L14, L24, L34, L44, f5 is an effective focal length of the fifth lens L15, L25, L35, L45, f6 is an effective focal length of the sixth lens L16, L26, L36, L46, f7 is an effective focal length of the seventh lens L17, L27, L37, L47, R11 is a curvature radius of the object side surface S11, S21, S31, S41 of the first lens L11, L21, L31, L41, R12 is a curvature radius of the image side surface S12, S22, S31 of the first lens L11, L21, L31, L41, 2, S42, R21 is a curvature radius of the object side S13, S23, S33, S43 of the second lens L12, L22, L32, L42, R22 is a curvature radius of the image side S14, S24, S34, S44 of the second lens L12, L22, L32, L42, R41 is a curvature radius of the image side S14, S24, S34, S44 of the fourth lens L14, L R42 is a curvature radius of one of the object side surfaces S18, S28, S38, S47 of the fourth lens L14, L24, L34, L44, R62 is a curvature radius of one of the image side surfaces S19, S29, S39, S48 of the sixth lens L16, L26, L36, L46, 13, S413 is a radius of curvature, T1 is a distance between the object side surface S11, S21, S31, S41 of the first lens L11, L21, L31, L41 and the image side surface S12, S22, S32, S42 of the first lens L11, L21, L31, L41 on the optical axis OA1, OA2, OA3, OA4, T6 is a distance between the sixth lens The distance between the object side surface S112, S212, S312, S412 of the lens L16, L26, L36, L46 and the image side surface S113, S213, S313, S413 of the sixth lens L16, L26, L36, L46 on the optical axis OA1, OA2, OA3, OA4 is TTL. 1. The object side surfaces S11, S21, S31, S41 of L41 are the distances to the imaging surfaces IMA1, IMA2, IMA3, IMA4 on the optical axes OA1, OA2, OA3, OA4; BFL is the distances to the image side surfaces S115, S215, S315, S419 of the lenses L17, L27, L37, L49 closest to the imaging surfaces IMA1, IMA2, IMA3, IMA4 on the optical axes OA1, OA2, OA3, OA4; Vd4 is the Abbe coefficient of the fourth lens L14, L24, L34, L44; and Vd5 is the Abbe coefficient of the fifth lens L15, L25, L35, L45. This enables imaging lenses 1, 2, 3, and 4 to effectively improve resolution, effectively reduce distortion, and effectively correct aberrations.

f7/f

1.94，可有效縮短鏡頭總長度。當滿足條件(2)：0.8

|f4/f5|

1.2，可有效提升收光能力。當滿足條件(3)：0.4

|f6/f5|

1.3，可有效修正畸變。當滿足條件(4)：4.8

R12/T1

6.2，可有效修正畸變。當滿足條件(5)：-4.9

R62/T6

-4.3，可有效修正場曲。當滿足條件(6)：3

|R41/R42|

5.7，可有效修正場曲。當滿足條件(7)：0.6

(R12-R11)/(R21-R22)

2.2，可有效修正場曲。當滿足條件(8)：-0.27

(R11-R12)/TTL

-0.16，可有效縮短鏡頭總長度。當滿足條件(9)：5

TTL/BFL

10，可有效控制後焦距長度以提高鏡頭製造良率。當滿足條件(10)：0.2

Vd4/Vd5

3.1，可有效修正色差、提升解析度。當第二透鏡物側為凸面、第三透鏡具有負屈光力或像側為凹面、第五透鏡像側為凸面、第六透鏡具有正屈光力、第六透鏡物側或像側為凸面、第七透鏡物側或像側為凸面，可有效修正畸變，降低影像變形。 When condition (1) is met: 1.56

f7/f

1.94, which can effectively shorten the total length of the lens. When condition (2) is met: 0.8

|f4/f5|

1.2, can effectively improve the light collection ability. When condition (3) is met: 0.4

|f6/f5|

1.3, which can effectively correct distortion. When condition (4) is met: 4.8

R12/T1

6.2, which can effectively correct distortion. When condition (5) is met: -4.9

R62/T6

-4.3, which can effectively correct field curvature. When condition (6) is met: 3

|R41/R42|

5.7, which can effectively correct field curvature. When condition (7) is met: 0.6

(R12-R11)/(R21-R22)

2.2, which can effectively correct field curvature. When condition (8) is met: -0.27

(R11-R12)/TTL

-0.16, which can effectively shorten the total length of the lens. When condition (9) is met: 5

TTL/BFL

10, can effectively control the back focal length to improve the lens manufacturing yield. When condition (10) is met: 0.2

Vd4/Vd5

3.1, can effectively correct chromatic aberration and improve resolution. When the object side of the second lens is convex, the third lens has negative refractive power or the image side is concave, the image side of the fifth lens is convex, the sixth lens has positive refractive power, the object side or image side of the sixth lens is convex, and the object side or image side of the seventh lens is convex, it can effectively correct distortion and reduce image deformation.

The first embodiment of the imaging lens of the present invention is described in detail. Referring to FIG. 1 , the imaging lens 1 includes a first lens L11, a second lens L12, a third lens L13, an aperture ST1, a fourth lens L14, a fifth lens L15, a sixth lens L16, a seventh lens L17 and a filter OF1 in sequence from an object side to an image side along an optical axis OA1. When imaging, the light from the object side is finally imaged on an imaging surface IMA1. According to the first to fifteenth paragraphs of [Implementation Method], the object side surface S15 and the image side surface S16 of the third lens L13 are both aspherical surfaces; the fourth lens L14 is a biconvex lens, and its object side surface S18 is a convex surface; the fifth lens L15 has a negative refractive power, and its object side surface S110 and image side surface S111 are both spherical surfaces; the object side surface S116 and the image side surface S117 of the filter OF1 are both planes; by using the above-mentioned lens, aperture ST1 and the design that satisfies at least one of the conditions (1) to (10), the imaging lens 1 can effectively improve the resolution, effectively reduce the distortion, and effectively correct the aberration.

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

Table 2 is a table of relevant parameters of the aspherical surface of the aspherical lens in Table 1.

Table 3 shows the relevant parameter values of the imaging lens 1 of the first embodiment and the calculated values of the corresponding conditions (1) to (10). It can be seen from Table 3 that the imaging lens 1 of the first embodiment can meet the requirements of conditions (1) to (10).

In addition, the optical performance of the imaging lens 1 of the first embodiment can also meet the requirements. As can be seen from Figure 2, the field curvature of the imaging lens 1 of the first embodiment is between -0.04mm and 0.035mm. As can be seen from Figure 3, the distortion of the imaging lens 1 of the first embodiment is between -1.2% and 0%. As can be seen from Figure 4, the modulation transfer function value of the imaging lens 1 of the first embodiment is between 0.52 and 1.0. As can be seen from Figure 5, the modulation transfer function value of the imaging lens 1 of the first embodiment is between 0.0 and 0.81 when the focus offset is between -0.05mm and 0.05mm. It is obvious that the field curvature and distortion of the imaging lens 1 of the first embodiment can be effectively corrected, and the lens resolution and focal depth can also meet the requirements, thereby obtaining better optical performance.

The second embodiment of the imaging lens of the present invention is now described in detail. Referring to FIG. 6 , the imaging lens 2 includes a first lens L21, a second lens L22, a third lens L23, an aperture ST2, a fourth lens L24, a fifth lens L25, a sixth lens L26, a seventh lens L27 and a filter OF2 in sequence from an object side to an image side along an optical axis OA2. When imaging, the light from the object side is finally imaged on an imaging surface IMA2. According to the first to fifteenth paragraphs of [Implementation Method], the object side surface S25 and the image side surface S26 of the third lens L23 are both aspherical surfaces; the fourth lens L24 is a biconvex lens, and its object side surface S28 is a convex surface; the fifth lens L25 has a negative refractive power, and its object side surface S210 and image side surface S211 are both spherical surfaces; the object side surface S216 and the image side surface S217 of the filter OF2 are both planes; by using the above-mentioned lens, aperture ST2 and the design that satisfies at least one of the conditions (1) to (10), the imaging lens 2 can effectively improve the resolution, effectively reduce the distortion, and effectively correct the aberration.

Table 4 is a table of relevant parameters of each lens of imaging lens 2 in Figure 6.

Table 5 is a table of relevant parameters of the aspherical surface of the aspherical 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 (10). It can be seen from Table 6 that the imaging lens 2 of the second embodiment can meet the requirements of conditions (1) to (10).

In addition, the optical performance of the imaging lens 2 of the second embodiment can also meet the requirements. As shown in Figure 7, the field curvature of the imaging lens 2 of the second embodiment is between -0.035mm and 0.035mm. As shown in Figure 8, the distortion of the imaging lens 2 of the second embodiment is between -1.4% and 0.2%. As shown in Figure 9, the modulation transfer function value of the imaging lens 2 of the second embodiment is between 0.58 and 1.0. As shown in Figure 10, the modulation transfer function value of the imaging lens 2 of the second embodiment is between 0.0 and 0.82 when the focus offset is between -0.05mm and 0.05mm. It is obvious that the field curvature and distortion of the imaging lens 2 of the second embodiment can be effectively corrected, and the lens resolution and focal depth can also meet the requirements, thereby obtaining better optical performance.

The third embodiment of the imaging lens of the present invention is now described in detail. Referring to FIG. 11 , the imaging lens 3 includes a first lens L31, a second lens L32, a third lens L33, an aperture ST3, a fourth lens L34, a fifth lens L35, a sixth lens L36, a seventh lens L37 and a filter OF3 in sequence from an object side to an image side along an optical axis OA3. When imaging, the light from the object side is finally imaged on an imaging surface IMA3. According to the first to fifteenth paragraphs of [Implementation Method], the object side surface S35 and the image side surface S36 of the third lens L33 are both aspherical surfaces; the fourth lens L34 is a biconvex lens, and its object side surface S38 is a convex surface; the fifth lens L35 has a negative refractive power, and its object side surface S310 and image side surface S311 are both spherical surfaces; the object side surface S316 and the image side surface S317 of the filter OF3 are both planes; by using the above-mentioned lens, aperture ST3 and the design that satisfies at least one of the conditions (1) to (10), the imaging lens 3 can effectively improve the resolution, effectively reduce the distortion, and effectively correct the aberration.

Table 7 is a table of relevant parameters of each lens of imaging lens 3 in Figure 11.

Table 8 is a table of relevant parameters of the aspherical surface of the aspherical 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 (10). It can be seen from Table 9 that the imaging lens 3 of the third embodiment can meet the requirements of conditions (1) to (10).

The fourth embodiment of the imaging lens of the present invention is now described in detail. Referring to FIG. 12, the imaging lens 4 includes a first lens L41, a second lens L42, a third lens L43, a fourth lens L44, an aperture ST4, a fifth lens L45, a sixth lens L46, a seventh lens L47, an eighth lens L48, a ninth lens L49 and a filter OF4 in sequence from an object side to an image side along an optical axis OA4. When imaging, the light from the object side is finally imaged on an imaging surface IMA4. According to the first to fifteenth paragraphs of [Implementation Method], the object side surface S45 and the image side surface S46 of the third lens L43 are both spherical surfaces; the fourth lens L44 is a meniscus lens, and its object side surface S47 is a concave surface; the fifth lens L45 has positive refractive power, and its object side surface S410 and image side surface S411 are both aspherical surfaces; the eighth lens L48 is a biconcave lens with negative refractive power, and its object side surface S416 is a concave surface, and the image side surface S417 is a concave surface, and the object side surface S416 and the image side surface S417 are both aspherical surfaces. The ninth lens L49 is a biconvex lens with positive refractive power, and its object side surface S418 is convex, and its image side surface S419 is convex. Both the object side surface S418 and the image side surface S419 are aspherical surfaces; the object side surface S420 and the image side surface S421 of the filter OF4 are both planes; by using the above-mentioned lens, aperture ST4 and the design that satisfies at least one of the conditions (1) to (10), the imaging lens 4 can effectively improve the resolution, effectively reduce the distortion, and effectively correct the aberration.

Table 10 is a table of relevant parameters of each lens of the imaging lens 4 in Figure 12.

Table 11 is a table of relevant parameters of the aspherical surface of the aspherical lens in Table 10.

Table 12 shows the relevant parameter values of the imaging lens 4 of the fourth embodiment and the calculated values corresponding to conditions (1) to (10). It can be seen from Table 12 that the imaging lens 4 of the fourth embodiment can meet the requirements of conditions (1) to (10).

In addition, the optical performance of the imaging lens 4 of the fourth embodiment can also meet the requirements. As shown in FIG. 13, the field curvature of the imaging lens 4 of the fourth embodiment is between -0.035 mm and 0.045 mm. As shown in FIG. 14, the distortion of the imaging lens 4 of the fourth embodiment is between -2% and 0%. As shown in FIG. 15, the modulation transfer function value of the imaging lens 4 of the fourth embodiment is between 0.52 and 1.0. As shown in FIG. 16, the modulation transfer function value of the imaging lens 4 of the fourth embodiment is between 0.0 and 0.78 when the focus offset is between -0.05 mm and 0.05 mm. It is obvious that the field curvature and distortion of the imaging lens 4 of the fourth embodiment can be effectively corrected, and the lens resolution and focal depth can also meet the requirements, thereby obtaining better optical performance.

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

1: Imaging lens

L11: First lens

L12: Second lens

L13: Third lens

L14: The fourth lens

L15: Fifth lens

L16: Sixth lens

L17: Seventh lens

ST1: Aperture

IMA1: Imaging surface

OA1: optical axis

S11: Object side of the first lens

S12: Side view of the first lens

S13: Second lens object side

S14: Second lens image side

S15: Third lens object side

S16: Third lens image side

S17: Aperture surface

S18: Fourth lens object side

S19: Fourth lens image side

S110: Fifth lens object side

S111: Fifth lens image side

S112: Object side of the sixth lens

S113: Sixth lens image side

S114: seventh lens object side

S115: Side view of the seventh lens

S116: Object side of filter

S117: Filter image side

Claims (10)

An imaging lens comprises: a first lens having positive refractive power; a second lens having refractive power; a third lens having negative refractive power; a fourth lens having positive refractive power, the fourth lens including a convex surface facing an image side; a fifth lens having refractive power, the fifth lens including a concave surface facing an object side; a sixth lens having positive refractive power; and a seventh lens having refractive power, the seventh lens including a convex surface facing the object side; wherein the number of lenses having refractive power is no more than nine; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence along an optical axis from the object side to the image side. An imaging lens comprises: a first lens having positive refractive power; a second lens having refractive power; a third lens having negative refractive power; a fourth lens having positive refractive power, the fourth lens including a convex surface facing an image side; a fifth lens having refractive power, the fifth lens including a concave surface facing an object side; a sixth lens having positive refractive power, the sixth lens including a convex surface facing the object side; and a seventh lens having refractive power; The number of lenses having refractive power is no more than nine; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence along an optical axis from the object side to the image side. An imaging lens comprises: a first lens having positive refractive power; a second lens having refractive power; a third lens having negative refractive power; a fourth lens having positive refractive power, the fourth lens including a convex surface facing an image side; a fifth lens having refractive power, the fifth lens including a concave surface facing an object side; a sixth lens having positive refractive power, the sixth lens including a convex surface facing the image side; and a seventh lens having refractive power; wherein the number of lenses having refractive power is no more than nine; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence from the object side to the image side along an optical axis. An imaging lens comprises: a first lens having positive refractive power; a second lens having refractive power, the second lens including a convex surface facing an object side; a third lens having negative refractive power; a fourth lens having positive refractive power, the fourth lens including a convex surface facing an image side; a fifth lens having refractive power, the fifth lens including a concave surface facing the object side; a sixth lens having positive refractive power; and a seventh lens having refractive power; wherein the number of lenses having refractive power is no more than nine; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence along an optical axis from the object side to the image side. An imaging lens comprises: a first lens having positive refractive power; a second lens having refractive power; a third lens having refractive power, the third lens including a concave surface facing an image side; a fourth lens having positive refractive power, the fourth lens including a convex surface facing the image side; a fifth lens having refractive power, the fifth lens including a concave surface facing an object side; a sixth lens having positive refractive power; and a seventh lens having refractive power; wherein the number of lenses having refractive power is no more than nine; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence along an optical axis from the object side to the image side. An imaging lens comprises: a first lens having positive refractive power; a second lens having refractive power; a third lens having refractive power; a fourth lens having positive refractive power, the fourth lens comprising a convex surface facing an image side; a fifth lens having refractive power, the fifth lens being a meniscus lens and comprising a concave surface facing an object side and a convex surface facing the image side; a sixth lens having positive refractive power; and a seventh lens having refractive power; wherein the number of lenses having refractive power is no more than nine; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence along an optical axis from the object side to the image side. An imaging lens comprises: a first lens having positive refractive power; a second lens having refractive power; a third lens having refractive power; a fourth lens having positive refractive power, the fourth lens including a convex surface facing an image side; a fifth lens having refractive power, the fifth lens including a concave surface facing an object side; a sixth lens having positive refractive power; and a seventh lens having refractive power, the seventh lens including a convex surface facing the image side; wherein the number of lenses having refractive power is no more than nine; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence along an optical axis from the object side to the image side. An imaging lens as claimed in any one of claims 1 to 7 of the patent application, wherein: the first lens is a meniscus lens and includes a convex surface facing the object side and a concave surface facing the image side; the second 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 third lens is a meniscus lens and includes a convex surface facing the object side and a concave surface facing the image side. ; The fourth lens is a biconvex lens, and further includes another convex surface facing the object side; The fifth lens is a meniscus lens with negative refractive power, and further includes a convex surface facing the image side; The sixth 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 seventh 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. An imaging lens as described in any one of claims 1 to 7 of the patent application scope, further comprising an eighth lens and a ninth lens disposed between the seventh lens and the image side, the eighth lens and the ninth lens being arranged in sequence from the object side to the image side along the optical axis; wherein: the first lens is a meniscus lens, and comprises a convex surface facing the object side and a concave surface facing the image side; the second lens is a meniscus lens having negative refractive power, and comprises a convex surface facing the object side and a concave surface facing the image side; the third lens is a meniscus lens, and comprises a convex surface facing the object side and a concave surface facing the image side; the fourth lens is a meniscus lens The fifth lens is a meniscus lens having positive refractive power and further comprising a convex surface facing the image side; the sixth lens is a biconvex lens having positive refractive power and comprising a convex surface facing the object side and another convex surface facing the image side; the seventh lens is a biconvex lens having positive refractive power and comprising a convex surface facing the object side and another convex surface facing the image side; the eighth lens is a biconcave lens having negative refractive power and comprising a concave surface facing the object side and another concave surface facing the image side; and the ninth lens is a biconvex lens having positive refractive power and comprising a convex surface facing the object side and another convex surface facing the image side. An imaging lens as claimed in any one of claims 1 to 7 of the patent application, wherein the imaging lens satisfies at least one of the following conditions: 1.56

f7/f

1.94; 0.8

｜f4/f5｜

1.2; 0.4

｜f6/f5｜

1.3; 4.8

R12/T1

6.2; -4.9

R62/T6

-4.3; 3

｜R41/R42｜

5.7; 0.6

(R12-R11)/(R21-R22)

2.2; -0.27

(R11-R12)/TTL

-0.16;5

TTL/BFL

10; 0.2

Vd4/Vd5

3.1; wherein f is an effective focal length of the imaging lens, f4 is an effective focal length of the fourth lens, f5 is an effective focal length of the fifth lens, f6 is an effective focal length of the sixth lens, f7 is an effective focal length of the seventh lens, R11 is a radius of curvature of an object side surface of the first lens, R12 is a radius of curvature of an image side surface of the first lens, R21 is a radius of curvature of an object side surface of the second lens, R22 is a radius of curvature of an image side surface of the second lens, R41 is a radius of curvature of an object side surface of the fourth lens, and R42 is a radius of curvature of the fourth lens. R62 is a radius of curvature of an image side surface of the sixth lens, T1 is a distance from the object side of the first lens to the image side surface of the first lens on the optical axis, T6 is a distance from an object side of the sixth lens to the image side surface of the sixth lens on the optical axis, TTL is a distance from the object side surface of the first lens to an imaging plane on the optical axis, BFL is a distance from an image side surface of the lens closest to the imaging plane to the imaging plane on the optical axis, Vd4 is an Abbe coefficient of the fourth lens, and Vd5 is an Abbe coefficient of the fifth lens.

Images