TWI861883B - Wide-angle lens assembly - Google Patents

Abstract

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

Description

Wide-angle lens (forty-six)

The present invention relates to a wide-angle lens.

The current development trend of wide-angle lenses is not only to develop towards a larger field of view, but also to have the characteristics of large aperture, high resolution and resistance to ambient temperature changes in accordance with different application requirements. The conventional wide-angle lenses can no longer meet the current needs. A new wide-angle lens structure is needed to simultaneously meet the needs of large field of view, large aperture, high resolution and resistance to ambient temperature changes.

In view of this, the main purpose of the present invention is to provide a wide-angle lens with a larger field of view, a smaller aperture value, a higher resolution, and resistance to ambient temperature changes, but still having good optical performance.

HFOV/f

71.4度/mm；-4.6

(R71+R72)/f7

-3.5；0.61

R11/R21

1.27；0.26

R11/R31

0.78；1.2

R11/R71

2.5；其中，HFOV為廣角鏡頭之一水平視場角，f為廣角鏡頭之一有效焦距，f7為第七透鏡之一有效焦距，R11為第一透鏡之一物側面之一曲率半徑，R21為第二透鏡之一物側面之一曲率半徑，R31為第三透鏡之一物側面之一曲率半徑，R71為第七透鏡之一物側面之一曲率半徑，R72為第七透鏡之一像側面之一曲率半徑。當本發明之廣角鏡頭滿足上述特徵及其中至少一條件且不需其他額外的特徵或條件，即可達成本發明之廣角鏡頭之基本功能。 The present invention provides a wide-angle 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, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are arranged in sequence from an object side to an image side along an optical axis. The first lens has a refractive power. The second lens has a negative refractive power, and the second lens includes a concave surface facing the image side. The third lens has a refractive power. The fourth lens has a positive refractive power, and the fourth lens is a biconvex lens, and includes a convex surface facing the object side and another convex surface facing the image side. The fifth lens has a refractive power. The sixth lens has a refractive power. The seventh lens has positive refractive power, is a biconvex lens, and includes a convex surface facing the object side and another convex surface facing the image side. The wide-angle lens meets at least one of the following conditions: 64.9 degrees/mm

HFOV/f

71.4 degrees/mm; -4.6

(R71+R72)/f7

-3.5; 0.61

R11/R21

1.27; 0.26

R11/R31

0.78; 1.2

R11/R71

2.5; wherein HFOV is a horizontal field of view of the wide-angle lens, f is an effective focal length of the wide-angle 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, R21 is a radius of curvature of an object side surface of the second lens, R31 is a radius of curvature of an object side surface of the third lens, R71 is a radius of curvature of an object side surface of the seventh lens, and R72 is a radius of curvature of an image side surface of the seventh lens. When the wide-angle lens of the present invention meets the above characteristics and at least one of the conditions and does not require other additional characteristics or conditions, the basic function of the wide-angle lens of the present invention can be achieved.

The first lens has negative refractive power, the third lens has positive refractive power, the fifth lens has positive refractive power, and the sixth lens has negative refractive power.

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

The fifth lens and the sixth lens are glued together.

The wide-angle lens of the present invention may further include an eighth lens and a ninth lens, wherein the eighth lens is disposed between the second lens and the third lens, and the ninth lens is disposed between the sixth lens and the seventh lens.

The eighth lens has negative refractive power, and the ninth lens has positive refractive power.

The eighth lens is a biconcave lens, and includes a concave surface facing the object side and another concave surface facing the image side. The ninth lens is a biconvex lens, and includes a convex surface facing the object side and another convex surface facing the image side.

The eighth lens and the third lens are glued together.

The wide-angle lens of the present invention may further include an aperture disposed between the third lens and the fifth lens.

｜f1/f｜

14.4；1.7

｜f2/f｜

3.8；3.3

｜f3/f｜

11.1；2.8

｜f4/f｜

5.3；2.1

｜f5/f｜

3.6；1.2

｜f6/f｜

2.0；0.05

BFL/TTL

0.20；1.6

R11/R51

2.7；其中，f為該廣角鏡頭之該有效焦距，f1為該第一透鏡之一有效焦距，f2為該第二透鏡之一有效焦距，f3為該第三透鏡之一有效焦距，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，R11為該第一透鏡之該物側面之該曲率半徑，R51為該第五透鏡之一物側面之一曲率半徑，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為該第七透鏡之該像側面至該成像面於該光軸上之一間距。 The wide-angle lens meets at least one of the following conditions: 3.4

｜f1/f｜

14.4; 1.7

｜f2/f｜

3.8; 3.3

｜f3/f｜

11.1; 2.8

｜f4/f｜

5.3;2.1

｜f5/f｜

3.6;1.2

｜f6/f｜

2.0; 0.05

BFL/TTL

0.20; 1.6

R11/R51

2.7; wherein f is the effective focal length of the wide-angle lens, f1 is an effective focal length of the first lens, f2 is an effective focal length of the second lens, f3 is an effective focal length of the third 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, R11 is the radius of curvature of the object side surface of the first lens, R51 is the radius of curvature of an object side surface of the fifth lens, TTL is a distance from the object side surface of the first lens to an imaging plane on the optical axis, and BFL is a distance from the image side surface of the seventh lens to the imaging plane on the optical axis.

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

1, 2, 3: Wide-angle lens

L11, L21, L31: First lens

L12, L22, L32: Second lens

L13, L23, L33: Third lens

L14, L24, L34: Fourth lens

L15, L25, L35: Fifth lens

L16, L26, L36: Sixth lens

L17, L27, L37: Seventh lens

L28, L38: Eighth lens

L29, L39: Ninth lens

ST1, ST2, ST3: Aperture

OF1, OF2, OF3: Filters

CG1, CG2, CG3: Protective glass

IMA1, IMA2, IMA3: Imaging surface

OA1, OA2, OA3: optical axis

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

S12, S22, S32: first lens image side

S13, S23, S33: Second lens object side

S14, S24, S34: Second lens image side

S15, S26, S36: Third lens object side

S16, S27, S37: Third lens image side

S18, S28, S38: fourth lens object side

S19, S29, S39: Fourth lens image side

S110, S211, S311: Fifth lens object side

S111, S212, S312: Fifth lens image side

S111, S212, S312: sixth lens object side

S112, S213, S313: Sixth lens image side

S113, S216, S316: seventh lens object side

S114, S217, S317: Side view of the seventh lens

S25, S35: The object side of the eighth lens

S26, S36: Eighth lens image side

S214, S314: The ninth lens object side

S215, S315: Ninth lens image side

S17, S210, S310: aperture surface

S115, S218, S318: Object side of filter

S116, S219, S319: filter image side

S117, S220, S320: Protect the side of the glass

S118, S221, S321: Protective glass image side

Figure 1 is a schematic diagram of the lens configuration of the first embodiment of the wide-angle lens of the present invention.

Figures 2, 3, 4, 5, 6, 7, and 8 are respectively the Longitudinal Aberration diagram, Field Curvature diagram, Distortion diagram, Lateral Color diagram, Relative Illumination diagram, Modulation Transfer Function diagram, and Through Focus Modulation Transfer Function diagram of the first embodiment of the wide-angle lens of the present invention.

Figure 9 is a schematic diagram of the lens configuration of the second embodiment of the wide-angle lens of the present invention.

Figures 10, 11, 12, 13, 14, 15, and 16 are respectively longitudinal aberration diagrams, field curvature diagrams, distortion diagrams, lateral chromatic aberration diagrams, relative illumination diagrams, modulation transfer function diagrams, and defocus modulation transfer function diagrams of the second embodiment of the wide-angle lens of the present invention.

Figure 17 is a schematic diagram of the lens configuration of the third embodiment of the wide-angle lens of the present invention.

Figures 18, 19, 20, 21, 22, 23, and 24 are respectively longitudinal aberration diagrams, field curvature diagrams, distortion diagrams, lateral chromatic aberration diagrams, relative illumination diagrams, modulation transfer function diagrams, and defocus modulation transfer function diagrams of the third embodiment of the wide-angle lens of the present invention.

HFOV/f

71.4度/mm；-4.6

(R71+R72)/f7

-3.5；0.61

R11/R21

1.27；0.26

R11/R31

0.78；1.2

R11/R71

2.5；其中，HFOV為該廣角鏡頭之一水平視場角(Horizontal Field of View)，f為該廣角鏡頭之一有效焦距，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，R21為該第二透鏡之一物側面之一曲率半徑，R31為該第三透鏡之一物側面之一曲率半徑，R71為該第七透鏡之一物側面之一曲率半徑，R72為該第七透鏡之一像側面之一曲率半徑。當本發明之廣角鏡頭滿足上述特徵及其中至少一條件，為本發明之一較佳實施例。 The present invention provides a wide-angle lens, comprising: a first lens having refractive power; a second lens having negative refractive power, the second lens including a concave surface facing an image side; a third lens having refractive power; a fourth lens having positive refractive power, the fourth lens being a biconvex lens and including a convex surface facing an object side and another convex surface facing the image side; a fifth lens having refractive power; a sixth lens having refractive power; and A seventh lens has positive refractive power, the seventh lens is a biconvex lens, and includes a convex surface facing the object side and another 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; wherein the wide-angle lens meets at least one of the following conditions: 64.9 degrees/mm

HFOV/f

71.4 degrees/mm; -4.6

(R71+R72)/f7

-3.5; 0.61

R11/R21

1.27; 0.26

R11/R31

0.78; 1.2

R11/R71

2.5; wherein HFOV is a horizontal field of view of the wide-angle lens, f is an effective focal length of the wide-angle 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, R21 is a radius of curvature of an object side surface of the second lens, R31 is a radius of curvature of an object side surface of the third lens, R71 is a radius of curvature of an object side surface of the seventh lens, and R72 is a radius of curvature of an image side surface of the seventh lens. When the wide-angle lens of the present invention meets the above characteristics and at least one of the conditions, it is a preferred embodiment of the present invention.

Please refer to Table 1, Table 2, Table 4, Table 5, Table 7 and Table 8 below, wherein Table 1, Table 4 and Table 7 are respectively tables of relevant parameters of each lens of the first embodiment to the third embodiment of the wide-angle lens according to the present invention, and Table 2, Table 5 and Table 8 are respectively tables of relevant parameters of the aspherical surface of the aspherical lens in Table 1, Table 4 and Table 7. 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 , 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~E are aspheric coefficients, and the aspheric coefficients can be expressed in scientific notations, for example, 2E-03 represents 2×10 ^-3 .

Figures 1, 9, and 17 are schematic diagrams of lens configurations of the first, second, and third embodiments of the wide-angle lens of the present invention, respectively. The first lens L11, L21, and L31 are meniscus lenses with negative refractive power, made of glass, and their object side surfaces S11, S21, and S31 are convex, and the image side surfaces S12, S22, and S32 are concave. The object side surfaces S11, S21, and S31 and the image side surfaces S12, S22, and S32 are all spherical surfaces.

The second lenses L12, L22, and L32 have negative refractive power and are made of glass. Their object side surfaces S13, S23, and S33 are convex, and their image side surfaces S14, S24, and S34 are concave.

The third lens L13, L23, and L33 are biconvex lenses with positive refractive power, made of glass, and their object side surfaces S15, S26, and S36 are convex, and their image side surfaces S16, S27, and S37 are convex. The object side surfaces S15, S26, and S36 and the image side surfaces S16, S27, and S37 are all spherical surfaces.

The fourth lens L14, L24, and L34 are biconvex lenses with positive refractive power, made of glass, and their object side surfaces S18, S28, and S38 are convex, and their image side surfaces S19, S29, and S39 are convex.

The fifth lens L15, L25, and L35 are biconvex lenses with positive refractive power, made of glass, and their object side surfaces S110, S211, and S311 are convex surfaces, and their image side surfaces S111, S212, and S312 are convex surfaces. The object side surfaces S110, S211, and S311 and the image side surfaces S111, S212, and S312 are all spherical surfaces.

The sixth lens L16, L26, and L36 are biconcave lenses with negative refractive power, made of glass, and their object side surfaces S111, S212, and S312 are concave surfaces, and their image side surfaces S112, S213, and S313 are concave surfaces. The object side surfaces S111, S212, and S312 and the image side surfaces S112, S213, and S313 are all spherical surfaces.

The fifth lens L15, L25, L35 is glued with the sixth lens L16, L26, L36.

The seventh lens L17, L27, and L37 are biconvex lenses with positive refractive power, made of glass, and their object side surfaces S114, S216, and S316 are convex, and their image side surfaces S115, S217, and S317 are convex. The object side surfaces S114, S216, and S316 and the image side surfaces S115, S217, and S317 are all aspherical surfaces.

In addition, wide-angle lenses 1, 2, and 3 satisfy at least one of the following conditions (1) to (13):

Wherein, HFOV is one of the horizontal field of view angles of the wide-angle lenses 1, 2, and 3 in the first to third embodiments, f is one of the effective focal lengths of the wide-angle lenses 1, 2, and 3 in the first to third embodiments, f1 is one of the effective focal lengths of the first lens L11, L21, and L31 in the first to third embodiments, f2 is one of the effective focal lengths of the second lens L12, L22, and L32 in the first to third embodiments, f3 is one of the effective focal lengths of the third lens L13, L23, and L33 in the first to third embodiments, and f4 is one of the effective focal lengths of the fourth lens L14, L24, and L35 in the first to third embodiments. f5 is an effective focal length of the fifth lens L15, L25, L35 in the first to third embodiments, f6 is an effective focal length of the sixth lens L16, L26, L36 in the first to third embodiments, f7 is an effective focal length of the seventh lens L17, L27, L37 in the first to third embodiments, R11 is a curvature radius of the object side S11, S21, S31 of the first lens L11, L21, L31 in the first to third embodiments, R21 is a curvature radius of the second lens L12, L22, L3 2 is a radius of curvature of the object side surface S13, S23, S33 of the third lens L13, L23, L33 in the first to third embodiments, R31 is a radius of curvature of the object side surface S15, S26, S36 of the third lens L13, L23, L33 in the first to third embodiments, R51 is a radius of curvature of the object side surface S110, S211, S311 of the fifth lens L15, L25, L35 in the first to third embodiments, R71 is a radius of curvature of the object side surface S113, S216, S316 of the seventh lens L17, L27, L37 in the first to third embodiments, and R72 is a radius of curvature of the object side surface S113, S216, S316 of the seventh lens L17, L27, L37 in the first to third embodiments. The image side surfaces S114, S217, S317 of the lenses L17, L27, L37 have a radius of curvature. TTL is a distance between the object side surfaces S11, S21, S31 of the first lenses L11, L21, L31 and the imaging surfaces IMA1, IMA2, IMA3 on the optical axes OA1, OA2, OA3 in the first to third embodiments. BFL is a distance between the image side surfaces S114, S217, S317 of the seventh lenses L17, L27, L37 and the imaging surfaces IMA1, IMA2, IMA3 on the optical axes OA1, OA2, OA3 in the first to third embodiments. This allows wide-angle lenses 1, 2, and 3 to effectively reduce the aperture value, effectively increase the field of view, effectively increase the resolution, effectively resist environmental temperature changes, and effectively correct aberrations.

HFOV/f

71.4度/mm時，可有效提高解析度、降低場曲、減少色散及減少鬼影發生。當滿足條件(9)：-4.6

(R71+R72)/f7

-3.5時，可有效提高解析度、降低場曲、減少色散及減少鬼影發生。當滿足條件(10)：0.61

R11/R21

1.27時，可有效提高解析度、降低場曲、減少色散及減少鬼影發生。當滿足條件(11)：0.26

R11/R31

0.78 時，可有效提高解析度、降低場曲、減少色散及減少鬼影發生。當滿足條件(12)：1.6

R11/R51

2.7時，可有效提高解析度、降低場曲、減少色散及減少鬼影發生。當滿足條件(13)：1.2

R11/R71

2.5時，可有效提高解析度、降低場曲、減少色散及減少鬼影發生。 When condition (8) is met: 64.9 degrees/mm

HFOV/f

71.4 degrees/mm, it can effectively improve resolution, reduce field curvature, reduce dispersion and reduce ghosting. When condition (9) is met: -4.6

(R71+R72)/f7

-3.5 can effectively improve resolution, reduce field curvature, reduce dispersion and reduce ghosting. When condition (10) is met: 0.61

R11/R21

When the value is 1.27, it can effectively improve the resolution, reduce the field curvature, reduce the dispersion and reduce the occurrence of ghosting. When the condition (11) is met: 0.26

R11/R31

When the value is 0.78, it can effectively improve the resolution, reduce the field curvature, reduce the dispersion and reduce the occurrence of ghosting. When the condition (12) is met: 1.6

R11/R51

2.7 can effectively improve resolution, reduce field curvature, reduce dispersion and reduce ghosting. When condition (13) is met: 1.2

R11/R71

When the value is 2.5, it can effectively improve the resolution, reduce the field curvature, reduce the dispersion and reduce the occurrence of ghosting.

The first embodiment of the wide-angle lens of the present invention is described in detail. The wide-angle 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, a filter OF1 and a protective glass CG1 along an optical axis OA1 from an object side to an image side. The fifth lens L15 and the sixth lens L16 are glued together, and their combined effective focal length is equal to -13.712 mm. When imaging, the light from the object side is finally imaged on an imaging surface IMA1. According to the first to tenth paragraphs of [Implementation Method], the object side surface S13 and the image side surface S14 of the second lens L12 are both aspherical surfaces; the object side surface S18 and the image side surface S19 of the fourth lens L14 are both spherical surfaces; the object side surface S115 and the image side surface S116 of the filter OF1 are both planes; the object side surface S117 and the image side surface S118 of the protective glass CG1 are both planes; by using the above-mentioned lens, aperture ST1 and the design that satisfies at least one of the conditions (1) to (13), the wide-angle lens 1 can effectively reduce the aperture value, effectively improve the field of view, effectively improve the resolution, effectively resist the change of ambient temperature, and effectively correct the aberration.

Table 1 is a table of relevant parameters of each lens of the wide-angle lens 1 in Figure 1.

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

Table 3 shows the relevant parameter values of the wide-angle lens 1 of the first embodiment and the calculated values of the corresponding conditions (1) to (13). It can be seen from Table 3 that the wide-angle lens 1 of the first embodiment can meet the requirements of conditions (1) to (13).

In addition, the optical performance of the wide-angle lens 1 of the first embodiment can also meet the requirements. As shown in Figure 2, the longitudinal aberration of the wide-angle lens 1 of the first embodiment is between -0.030mm and 0.035mm. As shown in Figure 3, the field curvature of the wide-angle lens 1 of the first embodiment is between -0.08mm and 0.15mm. As shown in Figure 4, the distortion of the wide-angle lens 1 of the first embodiment is between -9% and 0%. As shown in Figure 5, the lateral chromatic aberration of the wide-angle lens 1 of the first embodiment is between 0μm and 22μm. As can be seen from Figure 6, the wide-angle lens 1 of the first embodiment has a relative illumination of 0.48 to 1.0 for light with a wavelength of 0.53μm when the Y field of view is between 0mm and 3.38mm. As can be seen from Figure 7, the modulation transfer function value of the wide-angle lens 1 of the first embodiment is between 0.35 and 1.0. As can be seen from Figure 8, the modulation transfer function value of the wide-angle lens 1 of the first embodiment is between 0.0 and 0.78 when the focus offset is between -0.05mm and 0.05mm. It is obvious that the longitudinal aberration, field curvature, distortion, lateral chromatic aberration, and relative illumination of the wide-angle 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 wide-angle lens of the present invention is described in detail. The wide-angle lens 2 includes a first lens L21, a second lens L22, an eighth lens L28, a third lens L23, a fourth lens L24, an aperture ST2, a fifth lens L25, a sixth lens L26, a ninth lens L29, a seventh lens L27, a filter OF2 and a protective glass CG2 in order from an object side to an image side along an optical axis OA2. The eighth lens L28 is glued to the third lens L23, and the combined effective focal length is equal to 65.145 mm. The fifth lens L25 and the sixth lens L26 are glued together, and their combined effective focal length is equal to -19.619 mm. When imaging, the light from the object side is finally imaged on an imaging surface IMA2. According to the first to tenth paragraphs of [Implementation Method], the object side surface S23 and the image side surface S24 of the second lens L22 are both spherical surfaces; the eighth lens L28 is a biconcave lens with negative refractive power, its object side surface S25 is concave, and the image side surface S26 is concave, and the object side surface S25 and the image side surface S26 are both spherical surfaces; the eighth lens L28 is glued to the third lens L23; the object side surface S28 and the image side surface S29 of the fourth lens L24 are both aspherical surfaces; the ninth lens L29 is a biconvex lens with positive refractive power, and its object side surface S214 is convex. The image side surface S215 is a convex surface, and the object side surface S214 and the image side surface S215 are both spherical surfaces; the object side surface S218 and the image side surface S219 of the filter OF2 are both planes; the object side surface S220 and the image side surface S221 of the protective glass CG2 are both planes; by using the above-mentioned lens, aperture ST2 and the design that meets at least one of the conditions (1) to (13), the wide-angle lens 2 can effectively reduce the aperture value, effectively improve the field of view, effectively improve the resolution, effectively resist the change of environmental temperature, and effectively correct the aberration.

Table 4 is a table of relevant parameters of each lens of the wide-angle lens 2 in Figure 9.

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 wide-angle lens 2 of the second embodiment and the calculated values of the corresponding conditions (1) to (13). It can be seen from Table 6 that the wide-angle lens 2 of the second embodiment can meet the requirements of conditions (1) to (13).

In addition, the optical performance of the wide-angle lens 2 of the second embodiment can also meet the requirements. As shown in FIG. 10, the longitudinal aberration of the wide-angle lens 2 of the second embodiment is between -0.030 mm and 0.025 mm. As shown in FIG. 11, the field curvature of the wide-angle lens 2 of the second embodiment is between -0.04 mm and 0.08 mm. As shown in FIG. 12, the distortion of the wide-angle lens 2 of the second embodiment is between -9% and 0%. As shown in FIG. 13, the lateral chromatic aberration of the wide-angle lens 2 of the second embodiment is between -1 μm and 6.5 μm. As shown in FIG. 14, the wide-angle lens 2 of the second embodiment has a relative illumination of 0.58 to 1.0 for light with a wavelength of 0.53 μm when the Y field of view is between 0 mm and 3.38 mm. As shown in FIG. 15, the modulation transfer function value of the wide-angle lens 2 of the second embodiment is between 0.44 and 1.0. As shown in FIG. 16, the modulation transfer function value of the wide-angle lens 2 of the second embodiment is between 0.0 and 0.82 when the focus offset is between -0.05 mm and 0.05 mm. It is obvious that the longitudinal aberration, field curvature, distortion, lateral chromatic aberration, and relative illumination of the wide-angle lens 2 of the second embodiment can be effectively corrected, and the lens resolution and depth of focus can also meet the requirements, thereby obtaining better optical performance.

The third embodiment of the wide-angle lens of the present invention is now described in detail. The wide-angle lens 3 includes a first lens L31, a second lens L32, an eighth lens L38, a third lens L33, a fourth lens L34, an aperture ST3, a fifth lens L35, a sixth lens L36, a ninth lens L39, a seventh lens L37, a filter OF3 and a protective glass CG3 in order from an object side to an image side along an optical axis OA3. The eighth lens L38 is glued to the third lens L33, and the combined effective focal length is equal to 57.206 mm. The fifth lens L35 and the sixth lens L36 are glued together, and their combined effective focal length is equal to -18.504mm. When imaging, the light from the object side is finally imaged on an imaging surface IMA3. According to the first to tenth paragraphs of [Implementation Method], the object side surface S33 and the image side surface S34 of the second lens L32 are both spherical surfaces; the eighth lens L38 is a biconcave lens with negative refractive power, its object side surface S35 is concave, and the image side surface S36 is concave, and the object side surface S35 and the image side surface S36 are both spherical surfaces; the eighth lens L38 is glued to the third lens L33; the object side surface S38 and the image side surface S39 of the fourth lens L34 are both aspherical surfaces; the ninth lens L39 is a biconvex lens with positive refractive power, and its object side surface S314 is convex. The image side surface S315 is a convex surface, and the object side surface S314 and the image side surface S315 are both spherical surfaces; the object side surface S318 and the image side surface S319 of the filter OF3 are both planes; the object side surface S320 and the image side surface S321 of the protective glass CG3 are both planes; by using the above-mentioned lens, aperture ST3 and the design that meets at least one of the conditions (1) to (13), the wide-angle lens 3 can effectively reduce the aperture value, effectively improve the field of view, effectively improve the resolution, effectively resist the change of ambient temperature, and effectively correct the aberration.

Table 7 is a table of relevant parameters of each lens of the wide-angle lens 3 in Figure 17.

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 wide-angle lens 3 of the third embodiment and the calculated values corresponding to conditions (1) to (13). It can be seen from Table 9 that the wide-angle lens 3 of the third embodiment can meet the requirements of conditions (1) to (13).

In addition, the optical performance of the wide-angle lens 3 of the third embodiment can also meet the requirements. As shown in FIG. 18, the longitudinal aberration of the wide-angle lens 3 of the third embodiment is between -0.03mm and 0.03mm. As shown in FIG. 19, the field curvature of the wide-angle lens 3 of the third embodiment is between -0.03mm and 0.09mm. As shown in FIG. 20, the distortion of the wide-angle lens 3 of the third embodiment is between 0% and 2%. As shown in FIG. 21, the lateral chromatic aberration of the wide-angle lens 3 of the third embodiment is between -1.5μm and 5.5μm. As can be seen from FIG. 22, the wide-angle lens 3 of the third embodiment has a relative illumination of 0.78 to 1.0 for light with a wavelength of 0.53 μm when the Y field of view is between 0 mm and 3.38 mm. As can be seen from FIG. 23, the modulation transfer function value of the wide-angle lens 3 of the third embodiment is between 0.42 to 1.0. As can be seen from FIG. 24, the modulation transfer function value of the wide-angle lens 3 of the third embodiment is between 0.0 to 0.80 when the focus offset is between -0.05 mm and 0.05 mm. It is obvious that the longitudinal aberration, field curvature, distortion, lateral chromatic aberration, and relative illumination of the wide-angle lens 3 of the third 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: Wide-angle lens

L11: First lens

L12: Second lens

L13: Third lens

ST1: Aperture

L14: The fourth lens

L15: Fifth lens

L16: Sixth lens

L17: Seventh lens

OF1: Filter

CG1: Protective glass

IMA1: Imaging surface

OA1: optical axis

S11: Object side of the first lens

S12: Side view of the first lens

S13: Second lens object side

S14: Second lens image side

S15: 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

S111: Object side of the sixth lens

S112: Sixth lens image side

S113: seventh lens object side

S114: Side view of the seventh lens

S115: Object side of filter

S116: filter image side

S117: Protect the side of the glass

S118: Protective glass image side

Claims (10)

A wide-angle lens comprises: a first lens having refractive power; a second lens having negative refractive power, the second lens comprising a concave surface facing an image side; a third lens having refractive power; a fourth lens having positive refractive power, the fourth lens being a biconvex lens and comprising a convex surface facing an object side and another convex surface facing the image side; a fifth lens having refractive power; a sixth lens having refractive power; and A seventh lens has positive refractive power, the seventh lens is a biconvex lens, and includes a convex surface facing the object side and another 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 from the object side to the image side along an optical axis; wherein the wide-angle lens meets the following conditions: 64.9 degrees/mm

HFOV/f

71.4 degrees/mm; wherein HFOV is a horizontal field of view of the wide-angle lens, and f is an effective focal length of the wide-angle lens. The wide-angle lens as described in item 1 of the patent application, wherein the first lens has negative refractive power, the third lens has positive refractive power, the fifth lens has positive refractive power, and the sixth lens has negative refractive power. The wide-angle lens as described in item 2 of the patent application, wherein: The first lens is a meniscus lens, the first lens includes a convex surface facing the object side and a concave surface facing the image side; the second lens is a meniscus lens, the second lens further includes a convex surface facing the object side; the third lens is a biconvex lens, the third lens includes a convex surface facing the object side and another convex surface facing the image side; the fifth lens is a biconvex lens, the fifth lens includes a convex surface facing the object side and another convex surface facing the image side; and the sixth lens is a biconcave lens, the sixth lens includes a concave surface facing the object side and another concave surface facing the image side. The wide-angle lens as described in Item 3 of the patent application, wherein the fifth lens and the sixth lens are glued together. The wide-angle lens described in Item 3 of the patent application further includes an eighth lens and a ninth lens, wherein the eighth lens is disposed between the second lens and the third lens, and the ninth lens is disposed between the sixth lens and the seventh lens. The wide-angle lens as described in Item 5 of the patent application, wherein the eighth lens has negative refractive power and the ninth lens has positive refractive power. As described in item 6 of the patent application scope, the eighth lens is a biconcave lens, 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, and includes a convex surface facing the object side and another convex surface facing the image side. The wide-angle lens as described in Item 5 of the patent application, wherein the eighth lens and the third lens are glued together. The wide-angle lens described in item 3 of the patent application further includes an aperture disposed between the third lens and the fifth lens. A wide-angle lens as claimed in any one of claims 1 to 9 of the patent application, wherein the wide-angle lens satisfies at least one of the following conditions: 3.4

｜f1/f｜

14.4; 1.7

｜f2/f｜

3.8; 3.3

｜f3/f｜

11.1; 2.8

｜f4/f｜

5.3;2.1

｜f5/f｜

3.6;1.2

｜f6/f｜

2.0; 0.05

BFL/TTL

0.20; 1.6

R11/R51

2.7; -4.6

(R71+R72)/f7

-3.5; 0.61

R11/R21

1.27; 0.26

R11/R31

0.78; 1.2

R11/R71

2.5; wherein f is the effective focal length of the wide-angle lens, f1 is an effective focal length of the first lens, f2 is an effective focal length of the second lens, f3 is an effective focal length of the third 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, R11 is a radius of curvature of an object side surface of the first lens, R51 is a radius of curvature of an object side surface of the fifth lens, TT L 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 seventh lens to the imaging plane on the optical axis, f7 is an effective focal length of the seventh lens, R21 is a curvature radius of an object side surface of the second lens, R31 is a curvature radius of an object side surface of the third lens, R71 is a curvature radius of an object side surface of the seventh lens, and R72 is a curvature radius of the image side surface of the seventh lens.

Images