TWI752152B - 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 and a sixth lens. The first lens is a meniscus lens with negative refractive power. The second lens is a meniscus lens with positive refractive power. The third lens is a biconvex lens with positive refractive power. The fourth lens is with refractive power and includes a convex surface facing the object side. The fifth lens is with refractive power and includes a concave surface facing the image side. The sixth lens is with negative refractive power and includes a concave surface facing the object side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are arranged in order from the object side to the image side along an optical axis.

Description

Wide-angle lens (16)

The present invention relates to a wide-angle lens.

The development trend of today's wide-angle lens, in addition to the continuous development of miniaturization, large field of view and high resolution, with different application requirements, it is also necessary to have the ability to resist environmental temperature changes. In order to meet the requirements of miniaturization, large field of view, high resolution and resistance to environmental temperature changes at the same time, an imaging lens with a new architecture is required.

In view of this, the main purpose of the present invention is to provide a wide-angle lens, which has a short overall lens length, a large field of view, a high resolution, and is resistant to environmental temperature changes, but still has good optical performance.

The wide-angle lens of the present invention includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. The first lens has negative refractive power and includes a convex surface facing an object side and a concave surface facing an image side. The second lens has positive refractive power and includes a convex surface facing the object side and a concave surface facing the image side. The third lens is a biconvex lens with positive refractive power. The fourth lens has refractive power and includes a convex surface facing the object side. The fifth lens has refractive power and includes a concave surface facing the image side. The sixth lens has negative refractive power and includes a concave surface facing the object side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are along the An optical axis is arranged sequentially from the object side to the image side.

The fourth lens has a positive refractive power and includes a convex surface facing the image side, and the fifth lens has a negative refractive power and includes a concave surface facing the object side.

The fourth lens has a negative refractive power and includes a concave surface facing the image side, and the fifth lens has a positive refractive power and includes a convex surface facing the object side.

(R₃₁-R₃₂)/(R₃₁+R₃₂)×(R₄₁-R₄₂)/(R₄₁+R₄₂)×(R₅₁-R₅₂)/(R₅₁+R₅₂)×(R₆₁-R₆₂)/(R₆₁+R₆₂)

-2.8；其中，R₃₁為第三透鏡之一物側面之一曲率半徑，R₃₂為第三透鏡之一像側面之一曲率半徑，R₄₁為第四透鏡之一物側面之一曲率半徑，R₄₂為第四透鏡之一像側面之一曲率半徑，R₅₁為第五透鏡之一物側面之一曲率半徑，R₅₂為第五透鏡之一像側面之一曲率半徑，R₆₁為第六透鏡之一物側面之一曲率半徑，R₆₂為第六透鏡之一像側面之一曲率半徑。 Among them, the wide-angle lens meets the following conditions: -70

(R ₃₁ -R ₃₂ )/(R ₃₁ +R ₃₂ )×(R ₄₁ -R ₄₂ )/(R ₄₁ +R ₄₂ )×(R ₅₁ -R ₅₂ )/(R ₅₁ +R ₅₂ )×(R ₆₁ -R ₆₂ )/(R ₆₁ +R ₆₂ )

-2.8; wherein, R ₃₁ is a radius of curvature of an object side of the third lens, R ₃₂ is a radius of curvature of an image side of the third lens, R ₄₁ is a radius of curvature of an object side of the fourth lens, R ₄₂ is a radius of curvature of an image side of the fourth lens, R ₅₁ is a radius of curvature of an object side of the _{fifth lens, R 52} is a radius of curvature of an image side of the fifth lens, and R ₆₁ is the sixth A radius of curvature of one of the object sides of the lens, R ₆₂ is a radius of curvature of one of the image sides of the sixth lens.

100；其中，R₁₁為第一透鏡之一物側面之一曲率半徑，R₁₂為第一透鏡之一像側面之一曲率半徑。 The wide-angle lens satisfies the following conditions: 4<R ₁₁ /R ₁₂

100; wherein, R ₁₁ is a curvature radius of an object side surface of the _{first lens, and R 12} is a curvature radius of an image side surface of the first lens.

R₆₁/R₆₂<0.1；其中，R₆₁為第六透鏡之一物側面之一曲率半徑，R₆₂為第六透鏡之一像側面之一曲率半徑。 Among them, the wide-angle lens meets the following conditions: -100

R ₆₁ /R ₆₂ <0.1; wherein, R ₆₁ is a curvature radius of an object side surface of the _{sixth lens, and R 62} is a curvature radius of an image side surface of the sixth lens.

Vd₁/Nd₁

32；其中，Vd₁為第一透鏡之一阿貝係數，Nd₁為第一透鏡之一折射率。 Among them, the wide-angle lens meets the following conditions: 10

Vd ₁ /Nd ₁

32; wherein, Vd ₁ is an Abbe coefficient _{of the first lens, and Nd 1} is a refractive index of the first lens.

f/TTL

1；其中，f為廣 角鏡頭之一有效焦距，TTL為第一透鏡之一物側面至一成像側面於光軸上之一間距。 Among them, the wide-angle lens meets the following conditions: 0.2

f/TTL

1; wherein, f is an effective focal length of the wide-angle lens, and TTL is the distance on the optical axis from an object side of the first lens to an imaging side.

f₃/f

2；其中，f₃為第三透鏡之一有效焦距，f為廣角鏡頭之一有效焦距。 The wide-angle lens meets the following conditions: 1

f ₃ /f

2; wherein, f ₃ is an effective focal length of one of the third lenses, and f is an effective focal length of one of the wide-angle lenses.

The fourth lens and the fifth lens are cemented together.

The sixth lens includes a concave surface facing the image side.

The sixth lens includes a convex surface facing the image side.

The wide-angle lens of the present invention may further include a diaphragm disposed between the second lens and the third lens.

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

1, 2, 3, 4‧‧‧Wide-angle lens

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

ST1, ST2, ST3, ST4‧‧‧Aperture

OF1, OF2, OF3, OF4‧‧‧Filters

OA1, OA2, OA3, OA4‧‧‧optical axis

IMA1, IMA2, IMA3, IMA4‧‧‧Imaging plane

S11, S12, S13, S14, S15‧‧‧

S16, S17, S18, S19, S110‧‧‧face

S111, S112, S113, S114‧‧‧face

S21, S22, S23, S24, S25‧‧‧face

S26, S27, S28, S29, S210‧‧‧face

S211, S212, S213, S214‧‧‧face

S31, S32, S33, S34, S35‧‧‧surface

S36, S37, S38, S39, S310‧‧‧face

S311, S312, S313, S314‧‧‧face

S41, S42, S43, S44, S45: face

S46, S47, S48, S49, S410: Surface

S411, S412, S413, S414: Surface

FIG. 1 is a schematic diagram of the lens configuration and optical path of the first embodiment of the wide-angle lens according to the present invention.

FIG. 2A is a longitudinal spherical aberration (Longitudinal Spherical Aberration) diagram of the first embodiment of the wide-angle lens according to the present invention.

FIG. 2B is an Astigmatic Field Curves diagram of the first embodiment of the wide-angle lens according to the present invention.

FIG. 2C is a distortion diagram of the first embodiment of the wide-angle lens according to the present invention.

FIG. 3 is a schematic diagram of the lens configuration and optical path of the second embodiment of the wide-angle lens according to the present invention.

FIG. 4A is a longitudinal spherical aberration (Longitudinal Spherical Aberration) diagram of the second embodiment of the wide-angle lens according to the present invention.

FIG. 4B is an Astigmatic Field Curves diagram of the second embodiment of the wide-angle lens according to the present invention.

FIG. 4C is a distortion diagram of the second embodiment of the wide-angle lens according to the present invention.

FIG. 5 is a schematic diagram of the lens configuration and optical path of the third embodiment of the wide-angle lens according to the present invention.

FIG. 6A is a longitudinal spherical aberration (Longitudinal Spherical Aberration) diagram of the third embodiment of the wide-angle lens according to the present invention.

FIG. 6B is an Astigmatic Field Curves diagram of the third embodiment of the wide-angle lens according to the present invention.

FIG. 6C is a distortion diagram of the third embodiment of the wide-angle lens according to the present invention.

FIG. 7 is a schematic diagram of the lens configuration and optical path of the fourth embodiment of the wide-angle lens according to the present invention.

FIG. 8A is a longitudinal spherical aberration (Longitudinal Spherical Aberration) diagram of the fourth embodiment of the wide-angle lens according to the present invention.

FIG. 8B is an Astigmatic Field Curves diagram of the fourth embodiment of the wide-angle lens according to the present invention.

FIG. 8C is a distortion diagram of the fourth embodiment of the wide-angle lens according to the present invention.

Please refer to FIG. 1. FIG. 1 is a schematic diagram of the lens configuration and optical path of the first embodiment of the wide-angle lens according to the present invention. The wide-angle lens 1 is along an optical axis OA1 from an object side to an The image side sequentially includes a first lens L11, a second lens L12, an aperture ST1, a third lens L13, a fourth lens L14, a fifth lens L15, a sixth lens L16 and a filter OF1 . During imaging, the light from the object side is finally imaged on an imaging plane IMA1.

The first lens L11 is a meniscus lens with negative refractive power and is made of glass material. The object side S11 is convex, the image side S12 is concave, and both the object side S11 and the image side S12 are aspheric surfaces.

The second lens L12 is a meniscus lens with positive refractive power and is made of glass material. The object side S13 is convex, the image side S14 is concave, and both the object side S13 and the image side S14 are aspheric surfaces.

The third lens L13 is a biconvex lens with positive refractive power and is made of glass material. The object side S16 is convex, the image side S17 is convex, and both the object side S16 and the image side S17 are spherical surfaces.

The fourth lens L14 is a biconvex lens with positive refractive power and is made of glass material. The object side S18 is convex, the image side S19 is convex, and both the object side S18 and the image side S19 are spherical surfaces.

The fifth lens L15 is a biconcave lens with negative refractive power and is made of glass material. The object side S19 is concave, the image side S110 is concave, and both the object side S19 and the image side S110 are spherical surfaces.

The above-mentioned fourth lens L14 is cemented with the fifth lens L15.

The sixth lens L16 is a biconcave lens with negative refractive power and is made of glass material. The object side S111 is concave, the image side S112 is concave, and both the object side S111 and the image side S112 are aspheric surfaces.

The object side S113 and the image side S114 of the filter OF1 are both flat surfaces.

In addition, the wide-angle lens 1 in the first embodiment satisfies at least one of the following conditions:

Wherein, R1 ₁₁ is one of object-side surface S11 radius of curvature of the first lens L11, R1 ₁₂ of the first lens L11 is a radius of curvature of the image side surface of one of S12, R1 ₃₁ is one of a curvature radius of the object side S16 L13 of the third lens, R1 ₃₂ is a curvature radius of the image side S17 of the third lens L13, R1 ₄₁ is a curvature radius of the object side S18 of the _{fourth lens L14, R1 42} is a curvature radius of the image side S19 of the fourth lens L14, R1 ₅₁ is a radius of curvature of the object side S19 of the _{fifth lens L15, R1 52} is a curvature radius of the image side S110 of the fifth lens L15, R1 ₆₁ is a curvature radius of the object side S111 of the sixth lens L16, and R1 ₆₂ is the first A curvature radius of the image side S112 of the six lens L16, Vd1 ₁ is an Abbe coefficient _{of the first lens L11, Nd1 1} is a refractive index of the first lens L11, f1 is an effective focal length of the wide-angle lens 1, and f1 ₃ is the first An effective focal length of the three lenses L13, and TTL1 is a distance on the optical axis OA1 from the object side S11 of the first lens L11 to the imaging side IMA1.

Using the above-mentioned lens, aperture ST1 and satisfying at least conditions (1) to (6) wherein The design of one condition enables the wide-angle lens 1 to effectively shorten the total length of the lens, effectively increase the field of view, effectively increase the resolution, effectively correct aberrations, and resist changes in ambient temperature.

f1/TTL1

1，符合該範圍則具有最佳擴大視場角之條件。 If the value of condition (5) f1/TTL1 is greater than 1, it is difficult to achieve the purpose of expanding the viewing angle. Therefore, the value of f1/TTL1 must be at least less than 1, so the best effect range is 0.2

f1/TTL1

1. If it meets this range, it has the best conditions for expanding the field of view.

Table 1 is a table of relevant parameters of each lens of the wide-angle lens 1 in Figure 1. The data in Table 1 shows that the effective focal length of the wide-angle lens 1 of the first embodiment is equal to 5.078mm, the aperture value is equal to 2.0, the total length of the lens is equal to 22.000mm, and the field of view is equal to 22.000mm. Equal to 75.000 degrees.

The aspheric surface concavity z of each lens in Table 1 is obtained by the following formula: z=ch ² /{1+[1-(k+1)c ² h ² ] ^1/2 }+Ah ⁴ +Bh ⁶ + Ch ⁸

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

Table 2 is a table of relevant parameters of the aspheric surfaces of each lens in Table 1, where k is the Conic Constant, and A~C are the aspheric coefficients.

Table 3 shows the parameter values in the conditions (1) to (6) and the calculated values of the conditions (1) to (6). It can be seen from Table 3 that the wide-angle lens 1 of the first embodiment can meet the conditions (1) to the requirements of condition (6).

In addition, the optical performance of the wide-angle lens 1 of the first embodiment can also meet the requirements, which can be seen from Figs. 2A to 2C. FIG. 2A shows a longitudinal spherical aberration (Longitudinal Spherical Aberration) diagram of the wide-angle lens 1 of the first embodiment. FIG. 2B shows an Astigmatic Field Curves diagram of the wide-angle lens 1 of the first embodiment. FIG. 2C shows a distortion diagram of the wide-angle lens 1 of the first embodiment.

It can be seen from FIG. 2A that the longitudinal spherical aberration value of the wide-angle lens 1 of the first embodiment for light with wavelengths of 470.0000 nm, 555.0000 nm, and 650.0000 nm is between -0.015 mm and 0.015 mm.

It can be seen from Fig. 2B that the astigmatic field curvature of the wide-angle lens 1 of the first embodiment for light with a wavelength of 555.0000 nm in the meridional (Tangential) direction and the sagittal (Sagittal) direction is between -0.030mm and 0.030mm. .

It can be seen from FIG. 2C that the distortion caused by the wide-angle lens 1 of the first embodiment to light with a wavelength of 555.0000 nm is between -1.0% and 2.0%.

It is obvious that the longitudinal spherical aberration, astigmatic field curvature and distortion of the wide-angle lens 1 of the first embodiment can be effectively corrected, thereby obtaining better optical performance.

Please refer to FIG. 3 . FIG. 3 is a schematic diagram of the lens configuration and optical path of the second embodiment of the wide-angle lens according to the present invention. The wide-angle lens 2 includes a first lens L21 , a second lens L22 , an aperture ST2 , a third lens L23 , a fourth lens L24 , a fifth lens L24 and a fifth lens in sequence along an optical axis OA2 from an object side to an image side. Lens L25, a sixth lens L26 and a filter OF2. During imaging, the light from the object side is finally imaged on an imaging plane IMA2.

The first lens L21 is a meniscus lens with negative refractive power and is made of glass material Therefore, the object side S21 is convex, the image side S22 is concave, and both the object side S21 and the image side S22 are aspherical surfaces.

The second lens L22 is a meniscus lens with positive refractive power and is made of glass material. The object side S23 is convex, the image side S24 is concave, and both the object side S23 and the image side S24 are aspherical surfaces.

The third lens L23 is a biconvex lens with positive refractive power and is made of glass material. The object side S26 is convex, the image side S27 is convex, and both the object side S26 and the image side S27 are spherical surfaces.

The fourth lens L24 is a biconvex lens with positive refractive power and is made of glass material. The object side S28 is convex, the image side S29 is convex, and both the object side S28 and the image side S29 are spherical surfaces.

The fifth lens L25 is a biconcave lens with negative refractive power and is made of glass material. The object side S29 is concave, the image side S210 is concave, and both the object side S29 and the image side S210 are spherical surfaces.

The above-mentioned fourth lens L24 is cemented with the fifth lens L25.

The sixth lens L26 is a biconcave lens with negative refractive power and is made of glass material. The object side S211 is concave, the image side S212 is concave, and both the object side S211 and the image side S212 are aspheric surfaces.

The object side S213 and the image side S214 of the filter OF2 are both flat surfaces.

(R2₃₁-R2₃₂)/(R2₃₁+R2₃₂)×(R2₄₁-R2₄₂)/(R2₄₁+R2₄₂)×

In addition, the wide-angle lens 2 in the second embodiment satisfies at least one of the following conditions: -70

(R2 ₃₁ -R2 ₃₂ )/(R2 ₃₁ +R2 ₃₂ )×(R2 ₄₁ -R2 ₄₂ )/(R2 ₄₁ +R2 ₄₂ )×

The above-mentioned definitions of R2 ₁₁ , R2 ₁₂ , R2 ₃₁ , R2 ₃₂ , R2 ₄₁ , R2 ₄₂ , R2 ₅₁ , R2 ₅₂ , R2 ₆₁ , R2 ₆₂ , Vd2 ₁ , Nd2 ₁ , f2 , f2 ₃ and TTL1 and the first embodiment The definitions of R1 ₁₁ , R1 ₁₂ , R1 ₃₁ , R1 ₃₂ , R1 ₄₁ , R1 ₄₂ , R1 ₅₁ , R1 ₅₂ , R1 ₆₁ , R1 ₆₂ , Vd1 ₁ , Nd1 ₁ , f1 , f1 ₃ and TTL1 are the same, and they are all defined here I won't go into details.

Using the above-mentioned lens, aperture ST2 and the design that satisfies at least one of the conditions (7) to (12), the wide-angle lens 2 can effectively shorten the total length of the lens, effectively increase the field of view, effectively increase the resolution, and effectively correct Aberrations, resistance to ambient temperature changes.

f2₃/f2

2，符合該範圍則可有效控制第三透鏡L23形狀，同時約束第三透鏡L23之屈光力強度，並強化第三透鏡L23修正像差能力。 Condition (12) If _{the value of f2 3} /f2 is less than 1, the aberration correction capability of the third lens L23 is reduced, and the shape of the third lens L23 cannot be effectively controlled. Therefore, _{the value of f2 3} /f2 must be at least greater than 1, so the best effect range is 1

f2 ₃ /f2

2. Within this range, the shape of the third lens L23 can be effectively controlled, the refractive power of the third lens L23 is restricted, and the ability of the third lens L23 to correct aberrations is enhanced.

Table 4 is the relevant parameter table of each lens of the wide-angle lens 2 in Figure 3. The data in Table 4 shows that the effective focal length of the wide-angle lens 2 of the second embodiment is equal to 4.785mm, the aperture value is equal to 2.0, the total length of the lens is equal to 22.000mm, and the field of view is equal to 22.000mm. Equal to 77.387 degrees.

The aspheric surface concavity z of each lens in Table 4 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

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

Table 5 is a table of relevant parameters of the aspheric surfaces of each lens in Table 4, where k is the Conic Constant, and A~C are the aspheric coefficients.

Table 6 shows the parameter values in the conditions (7) to (12) and the calculated values of the conditions (7) to (12). It can be seen from Table 6 that the wide-angle lens 2 of the second embodiment can meet the conditions (7) to Requirements of Condition (12).

In addition, the optical performance of the wide-angle lens 2 of the second embodiment can also meet the requirements, which can be seen from FIGS. 4A to 4C . FIG. 4A shows a longitudinal spherical aberration (Longitudinal Spherical Aberration) diagram of the wide-angle lens 2 of the second embodiment. FIG. 4B shows an Astigmatic Field Curves diagram of the wide-angle lens 2 of the second embodiment. FIG. 4C shows a distortion diagram of the wide-angle lens 2 of the second embodiment.

It can be seen from FIG. 4A that the longitudinal spherical aberration value of the wide-angle lens 2 of the second embodiment for light with wavelengths of 470.0000 nm, 555.0000 nm, and 650.0000 nm is between -0.015 mm and 0.015 mm.

It can be seen from Fig. 4B that the astigmatic field curvature of the wide-angle lens 2 of the second embodiment for light with a wavelength of 555.0000 nm in the meridional (Tangential) direction and the sagittal (Sagittal) direction is between -0.020mm and 0.020mm. .

It can be seen from FIG. 4C that the distortion caused by the wide-angle lens 2 of the second embodiment to light with a wavelength of 555.0000 nm is between -1.0% and 2.0%.

It is obvious that the longitudinal spherical aberration, astigmatic field curvature and distortion of the wide-angle lens 2 of the second embodiment can be effectively corrected, thereby obtaining better optical performance.

Please refer to FIG. 5. FIG. 5 is a schematic diagram of the lens configuration and optical path of the third embodiment of the wide-angle lens according to the present invention. The wide-angle lens 3 includes a first lens L31 , a second lens L32 , an aperture ST3 , a third lens L33 , a fourth lens L34 , a fifth lens L34 , and a fifth lens in sequence along an optical axis OA3 from an object side to an image side Lens L35, a sixth lens L36 and a filter OF3. During imaging, the light from the object side is finally imaged on an imaging plane IMA3.

The first lens L31 is a meniscus lens with negative refractive power and is made of glass material. The object side S31 is convex, the image side S32 is concave, and both the object side S31 and the image side S32 are aspheric surfaces.

The second lens L32 is a meniscus lens with positive refractive power and is made of glass material. The object side S33 is convex, the image side S34 is concave, and both the object side S33 and the image side S34 are aspheric surfaces.

The third lens L33 is a biconvex lens with positive refractive power and is made of glass material. The object side S36 is convex, the image side S37 is convex, and both the object side S36 and the image side S37 are spherical surfaces.

The fourth lens L34 is a meniscus lens with negative refractive power and is made of glass material Therefore, the object side S38 is convex, the image side S39 is concave, and both the object side S38 and the image side S39 are spherical surfaces.

The fifth lens L35 is a meniscus lens with positive refractive power and is made of glass material. The object side S39 is convex, the image side S310 is concave, and both the object side S39 and the image side S310 are spherical surfaces.

The above-mentioned fourth lens L34 is cemented with the fifth lens L35.

The sixth lens L36 is a biconcave lens with negative refractive power and is made of glass material. The object side S311 is concave, the image side S312 is concave, and both the object side S311 and the image side S312 are aspheric surfaces.

The object side S313 and the image side S314 of the filter OF3 are both flat.

In addition, the wide-angle lens 3 in the third embodiment satisfies at least one of the following conditions:

The above-mentioned definitions of R3 ₁₁ , R3 ₁₂ , R3 ₃₁ , R3 ₃₂ , R3 ₄₁ , R3 ₄₂ , R3 ₅₁ , R3 ₅₂ , R3 ₆₁ , R3 ₆₂ , Vd3 ₁ , Nd3 ₁ , f3 , f3 ₃ and TTL3 and the first embodiment The definitions of R1 ₁₁ , R1 ₁₂ , R1 ₃₁ , R1 ₃₂ , R1 ₄₁ , R1 ₄₂ , R1 ₅₁ , R1 ₅₂ , R1 ₆₁ , R1 ₆₂ , Vd1 ₁ , Nd1 ₁ , f1 , f1 ₃ and TTL1 are the same, and they are all defined here I won't go into details.

Using the above-mentioned lens, aperture ST3 and the design that satisfies at least one of the conditions (13) to (18), the wide-angle lens 3 can effectively shorten the total length of the lens, effectively increase the field of view, effectively increase the resolution, and effectively correct Aberrations, resistance to ambient temperature changes.

100，符合該範圍則可有效控制第一透鏡L31形狀，同時約束第一透鏡L31之屈光力強度，並強化第一透鏡L31修正像差能力。 Condition (12) If _{the value of R3 11} /R3 ₁₂ is less than 4, the aberration correction capability of the first lens L31 is reduced, and the shape of the first lens L31 cannot be effectively controlled. Therefore, _{the value of R3 11} /R3 ₁₂ must be at least greater than 4, so the best effect range is 4<R3 ₁₁ /R3 ₁₂

100, within this range, the shape of the first lens L31 can be effectively controlled, the refractive power of the first lens L31 is restricted, and the aberration correction ability of the first lens L31 is enhanced.

Table 7 is a table of relevant parameters of each lens of the wide-angle lens 3 in Figure 5. The data in Table 7 shows that the effective focal length of the wide-angle lens 3 of the third embodiment is equal to 4.715mm, the aperture value is equal to 2.0, the total length of the lens is equal to 23.501mm, and the field of view is equal to 23.501mm. Equal to 78.209 degrees.

The aspheric surface concavity z of each lens in Table 7 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

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

Table 8 is a table of relevant parameters of the aspheric surfaces of each lens in Table 7, where k is the Conic Constant, and A~C are the aspheric coefficients.

Table 9 shows the parameter values in the conditions (13) to (18) and the calculated values of the conditions (13) to (18). It can be seen from Table 9 that the wide-angle lens 3 of the third embodiment can meet the conditions (13) to the requirements of condition (18).

In addition, the optical performance of the wide-angle lens 3 of the third embodiment can also meet the requirements, which can be seen from FIGS. 6A to 6C. FIG. 6A shows a longitudinal spherical aberration (Longitudinal Spherical Aberration) diagram of the wide-angle lens 3 of the third embodiment. FIG. 6B shows an Astigmatic Field Curves diagram of the wide-angle lens 3 of the third embodiment. FIG. 6C shows a distortion diagram of the wide-angle lens 3 of the third embodiment.

It can be seen from FIG. 6A that the longitudinal spherical aberration of the wide-angle lens 3 of the third embodiment to light with wavelengths of 470.0000 nm, 555.0000 nm, and 650.0000 nm is between -0.015 mm and 0.015 mm.

It can be seen from Fig. 6B that the astigmatic field curvature of the wide-angle lens 3 of the third embodiment for light with a wavelength of 555.0000 nm in the meridional (Tangential) direction and the sagittal (Sagittal) direction is between -0.030mm and 0.030mm. .

It can be seen from FIG. 6C that the distortion caused by the wide-angle lens 3 of the third embodiment to light with a wavelength of 555.0000 nm is between 0% and 2.0%.

It is obvious that the longitudinal spherical aberration, astigmatic field curvature, and distortion of the wide-angle lens 3 of the third embodiment can be effectively corrected, thereby obtaining better optical performance.

Please refer to FIG. 7. FIG. 7 is a schematic diagram of the lens configuration and optical path of the fourth embodiment of the wide-angle lens according to the present invention. The wide-angle lens 4 is along an optical axis OA4 from an object side to an The image side sequentially includes a first lens L41, a second lens L42, an aperture ST4, a third lens L43, a fourth lens L44, a fifth lens L45, a sixth lens L46 and a filter OF4 . During imaging, the light from the object side is finally imaged on an imaging plane IMA4.

The first lens L41 is a meniscus lens with negative refractive power and is made of glass material. The object side S41 is convex, the image side S42 is concave, and both the object side S41 and the image side S42 are aspherical surfaces.

The second lens L42 is a meniscus lens with positive refractive power and is made of glass material. The object side S43 is convex, the image side S44 is concave, and both the object side S43 and the image side S44 are aspheric surfaces.

The third lens L43 is a biconvex lens with positive refractive power and is made of glass material. The object side S46 is convex, the image side S47 is convex, and both the object side S46 and the image side S47 are spherical surfaces.

The fourth lens L44 is a biconvex lens with positive refractive power and is made of glass material. The object side S48 is convex, the image side S49 is convex, and both the object side S48 and the image side S49 are spherical surfaces.

The fifth lens L45 is a double concave lens with negative refractive power and is made of glass material. The object side S49 is concave, the image side S410 is concave, and both the object side S49 and the image side S410 are spherical surfaces.

The above-mentioned fourth lens L44 is cemented with the fifth lens L45.

The sixth lens L46 is a meniscus lens with negative refractive power and is made of glass material. The object side S411 is concave, the image side S412 is convex, and both the object side S411 and the image side S412 are aspheric surfaces.

The object side S413 and the image side S414 of the filter OF4 are both flat.

In addition, the wide-angle lens 4 in the fourth embodiment satisfies at least one of the following conditions:

The above-mentioned definitions of R4 ₁₁ , R4 ₁₂ , R4 ₃₁ , R4 ₃₂ , R4 ₄₁ , R4 ₄₂ , R4 ₅₁ , R4 ₅₂ , R4 ₆₁ , R4 ₆₂ , Vd4 ₁ , Nd4 ₁ , f4 , f4 ₃ and TTL4 and the first embodiment The definitions of R1 ₁₁ , R1 ₁₂ , R1 ₃₁ , R1 ₃₂ , R1 ₄₁ , R1 ₄₂ , R1 ₅₁ , R1 ₅₂ , R1 ₆₁ , R1 ₆₂ , Vd1 ₁ , Nd1 ₁ , f1 , f1 ₃ and TTL1 are the same, and they are all defined here I won't go into details.

Using the above-mentioned lens, aperture ST4 and the design that satisfies at least one of the conditions (19) to (24), the wide-angle lens 4 can effectively shorten the total length of the lens, effectively increase the field of view, effectively increase the resolution, and effectively correct Aberrations, resistance to ambient temperature changes.

R4₆₁/R4₆₂<0.1，符合該範圍則可有效控制第六透鏡L46形狀，同時約束第六透鏡L46之屈光力強度， 並強化第六透鏡L46修正像差能力。 If the value of the condition (21) R4 ₆₁ /R4 ₆₂ is greater than 0.1, the aberration correction capability of the sixth lens L46 is reduced, and the shape of the sixth lens L46 cannot be effectively controlled. Therefore, _{the value of R4 61} /R4 ₆₂ must be at least less than 0.1, so the best effect range is -100

R4 ₆₁ /R4 ₆₂ <0.1, within this range, the shape of the sixth lens L46 can be effectively controlled, the refractive power of the sixth lens L46 is restricted, and the aberration correction ability of the sixth lens L46 is strengthened.

Table 10 is a table of relevant parameters of each lens of the wide-angle lens 4 in Figure 7. The data in Table 10 shows that the effective focal length of the wide-angle lens 4 of the fourth embodiment is equal to 4.795mm, the aperture value is equal to 2.0, the total lens length is equal to 22.000mm, and the field of view is equal to 22.000mm. Equal to 77.278 degrees.

The aspheric surface concavity z of each lens in Table 10 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

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

Table 11 is a table of relevant parameters of the aspheric surfaces of each lens in Table 10, where k is the Conic Constant, and A~C are the aspheric coefficients.

Table 12 shows the parameter values from conditions (19) to (24) and conditions (19) to conditions For the calculated value of (24), it can be seen from Table 12 that the wide-angle lens 4 of the fourth embodiment can all meet the requirements of conditions (19) to (24).

In addition, the optical performance of the wide-angle lens 4 of the fourth embodiment can also meet the requirements, which can be seen from FIGS. 8A to 8C . FIG. 8A shows a longitudinal spherical aberration (Longitudinal Spherical Aberration) diagram of the wide-angle lens 4 of the fourth embodiment. FIG. 8B shows an Astigmatic Field Curves diagram of the wide-angle lens 4 of the fourth embodiment. FIG. 8C shows a distortion diagram of the wide-angle lens 4 of the fourth embodiment.

It can be seen from FIG. 8A that the longitudinal spherical aberration value of the wide-angle lens 4 of the fourth embodiment for light with wavelengths of 470.0000 nm, 555.0000 nm, and 650.0000 nm is between -0.015 mm and 0.015 mm.

It can be seen from FIG. 8B that the astigmatic field curvature of the wide-angle lens 4 of the fourth embodiment for light with a wavelength of 555.0000 nm in the meridional (Tangential) direction and the sagittal (Sagittal) direction is between -0.030mm and 0.030mm. .

It can be seen from FIG. 8C that the distortion caused by the wide-angle lens 4 of the fourth embodiment to light with a wavelength of 555.0000 nm is between -1.0% and 2.5%.

It is obvious that the longitudinal spherical aberration, astigmatic field curvature and distortion of the wide-angle lens 4 of the fourth embodiment can be effectively corrected, thereby obtaining better optical performance.

f/TTL

1、1

f₃/f

2、4<R₁₁/R₁₂

100、-100

R₆₁/R₆₂<0.1為中心，本發明實施例的數值也落入其餘公式的範圍內。公式1

f₃/f

2，可助於光學特性與鏡頭製造性間取得較好的平衡。公式0.2

f/TTL

1，可助於鏡頭達到小型化。公式4<R₁₁/R₁₂

100，可助於控制第一透鏡形狀，同時約束第一透鏡之屈光力強度，並強化第一透鏡修正像差能力。公式-100

R₆₁/R₆₂<0.1，可助於控制第六透鏡形狀，同時約束第六透鏡之屈光力強度，並強化第六透鏡修正像差能力。 The formula that the present invention conforms to is 0.2

f/TTL

1.1

f ₃ /f

2. 4<R ₁₁ /R ₁₂

100, -100

R ₆₁ /R ₆₂ <0.1 is the center, and the numerical values of the embodiments of the present invention also fall within the scope of the remaining formulas. Formula 1

f ₃ /f

2. It can help to achieve a better balance between optical characteristics and lens manufacturability. Formula 0.2

f/TTL

1. It can help the lens to achieve miniaturization. Equation 4<R ₁₁ /R ₁₂

100 , which can help control the shape of the first lens, constrain the refractive power of the first lens, and strengthen the ability of the first lens to correct aberrations. formula-100

R ₆₁ /R ₆₂ <0.1, which can help control the shape of the sixth lens, constrain the refractive power of the sixth lens, and strengthen the ability of the sixth lens to correct aberrations.

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 changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection of the present invention The scope shall be determined by the scope of the appended patent application.

1‧‧‧Wide-angle lens

L11‧‧‧First Lens

L12‧‧‧Second Lens

L13‧‧‧Third Lens

L14‧‧‧fourth lens

L15‧‧‧Fifth Lens

L16‧‧‧Sixth Lens

ST1‧‧‧Aperture

OF1‧‧‧Filter

OA1‧‧‧optical axis

IMA1‧‧‧Imaging Surface

S11, S12, S13, S14, S15‧‧‧

S16, S17, S18, S19, S110‧‧‧face

S111, S112, S113, S114‧‧‧face

Claims (10)

A wide-angle lens, comprising: a first lens having negative refractive power, the first lens being a meniscus lens; a second lens having positive refractive power, the second lens being a meniscus lens; a third lens having positive refractive power, the The third lens is a biconvex lens; a fourth lens has refractive power, the fourth lens includes a convex surface facing an object side; a fifth lens has refractive power, and the fifth lens includes a concave surface facing an image side; and a sixth lens With negative refractive power, the sixth lens includes a concave surface facing the object side; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are along a light The axes are arranged in order from the object side to the image side; wherein the wide-angle lens satisfies the following conditions: -70

(R ₃₁ -R ₃₂ )/(R ₃₁ +R ₃₂ )×(R ₄₁ -R ₄₂ )/(R ₄₁ +R ₄₂ )×(R ₅₁ -R ₅₂ )/(R ₅₁ +R ₅₂ )×(R ₆₁ -R ₆₂ )/(R ₆₁ +R ₆₂ )

-2.8; wherein, R _{31 is a} radius of curvature of one of the object sides of _{the third lens, R 32 is a} radius of curvature of an image side of the third lens, and R _{41 is} one of the object sides of the fourth lens Radius of curvature, R _{42 is a} radius of curvature of an image side of the fourth lens, R _{51 is a} radius of curvature of an object side of _{the fifth lens, R 52 is a} radius of curvature of an image side of the fifth lens , R _{61 is a} curvature radius of an object side surface of _{the sixth lens, and R 62 is a} curvature radius of an image side surface of the sixth lens. A wide-angle lens, comprising: a first lens having negative refractive power, the first lens being a meniscus lens; a second lens having positive refractive power, the second lens being a meniscus lens; a third lens having positive refractive power, the The third lens is a biconvex lens; a fourth lens has refractive power, the fourth lens includes a convex surface facing an object side; a fifth lens has refractive power, and the fifth lens includes a concave surface facing an image side; and a sixth lens With negative refractive power, the sixth lens includes a concave surface facing the object side; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are along a light The axes are arranged in order from the object side to the image side; wherein the wide-angle lens satisfies the following conditions: 10

Vd ₁ /Nd ₁

32; wherein, Vd _{1 is an} Abbe coefficient of _{the first lens, and Nd 1 is a} refractive index of the first lens. A wide-angle lens, comprising: a first lens having negative refractive power, the first lens being a meniscus lens; a second lens having positive refractive power, the second lens being a meniscus lens; a third lens having positive refractive power, the The third lens is a biconvex lens; a fourth lens has refractive power, the fourth lens includes a convex surface facing an object side; a fifth lens has refractive power, and the fifth lens includes a concave surface facing an image side; and a sixth lens With negative refractive power, the sixth lens includes a concave surface facing the object side; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are along a light The axes are arranged in sequence from the object side to the image side; wherein the sixth lens includes a convex surface facing the image side. The wide-angle lens of any one of claims 1 to 3, wherein the fourth lens has a positive refractive power and includes a convex surface facing the image side, and the fifth lens has a negative refractive power and includes a concave surface facing the object side . The wide-angle lens according to any one of claims 1 to 3, wherein the fourth lens has a negative refractive power and includes a concave surface facing the image side, and the fifth lens has a positive refractive power and includes a convex surface facing the object side . The wide-angle lens according to claim 1 or claim 2, wherein the sixth lens includes a convex surface facing the image side. The wide-angle lens of any one of claims 1 to 3, wherein the sixth lens includes a concave surface facing the image side. The wide-angle lens according to any one of claims 1 to 3, further comprising an aperture, disposed between the second lens and the third lens. The wide-angle lens according to any one of claims 1 to 3, wherein the fourth lens and the fifth lens are cemented. The wide-angle lens according to any one of claims 1 to 3 of the scope of application, wherein the wide-angle lens satisfies the following conditions: 0.2

f/TTL

_{1; 4 <R 11 / R} 12

100;-100

R ₆₁ /R ₆₂ <0.1; 1

f ₃ /f

2; wherein, f is an effective focal length of the wide-angle lens, TTL is a spacing on the optical axis from an object side surface of the first lens to an imaging side surface, and R ₁₁ is a curvature of an object side surface of the first lens Radius, R _{12 is a} curvature radius of an image side surface of the first lens, R _{61 is a} curvature radius of an object side surface of _{the sixth lens, R 62 is a} curvature radius of an image side surface of the sixth lens, f is one of the effective focal lengths of the wide-angle lens.

Images