TW202011072A - 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, a seventh lens, an eighth lens, and a ninth lens. The first lens is a meniscus with negative refractive power. The second lens is a meniscus with negative refractive power. The third lens is with refractive power and includes a concave surface facing an object side. The fourth lens is with positive refractive power and includes a convex surface facing an image side. The fifth lens is with refractive power. The sixth lens is a biconvex lens with positive refractive power. The seventh lens is with refractive power. The eighth lens is with positive refractive power. The ninth lens is with positive refractive power. The first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth lenses are arranged in order from the object side to the image side along an optical axis.

Description

Wide-angle lens (19)

The invention relates to a wide-angle lens.

The current development trend of wide-angle lenses, in addition to the continuous development of large angles of view and large apertures, with different application requirements, the need for short total lens length and high resolution capabilities, the conventional wide-angle lens has been unable to meet today's needs, Another wide-angle lens with a new architecture is needed to meet the needs of a large angle of view, a large aperture, a short total lens length, and high resolution.

In view of this, the main purpose of the present invention is to provide a wide-angle lens with a larger angle of view, a smaller aperture value, a shorter overall lens length, and a higher resolution, but still having 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, a sixth lens, a seventh lens, an eighth lens, and a ninth 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 negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side. The third lens has negative refractive power. The fourth lens has positive refractive power. The fifth lens has positive refractive power. The sixth lens has positive refractive power. The seventh lens has negative refractive power. The eighth lens has positive refractive power. The ninth lens has positive refractive power. The first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth lenses are arranged in order from the object side to the image side along an optical axis.

According to the present invention, a wide-angle lens is further provided, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a The ninth lens. The first lens has refractive power and is a meniscus lens. The second lens has refractive power and is a meniscus lens. The third lens has refractive power and includes a concave surface facing an object side. The fourth lens has positive refractive power and includes a convex surface facing the image side. The fifth lens has refractive power. The sixth lens has positive refractive power and is a biconvex lens. The seventh lens has refractive power. The eighth lens has positive refractive power. The ninth lens has positive refractive power. The first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth lenses are sequentially arranged along the optical axis from the object side to the image side.

The wide-angle lens satisfies the following conditions: 1.55<TTL/R ₁₁ <1.75; where TTL is the distance between the object side of the first lens and an imaging plane on the optical axis, and R ₁₁ is the curvature of the object side of the first lens radius.

The wide-angle lens satisfies the following conditions: 12.7<TTL/f<12.9; where TTL is the distance between the object side of the first lens and an imaging plane on the optical axis, and f is the effective focal length of the wide-angle lens.

The wide-angle lens satisfies the following conditions: -0.4<f ₁₂₃ /f ₄₅ <-0.3; where f ₁₂₃ is the effective focal length of a combination of the first lens, the second lens, and the third lens, and f ₄₅ is the fourth lens and the first lens One of the five lens combinations combines the effective focal length.

The wide-angle lens satisfies the following condition: Vd ₂ >30; where, Vd ₂ is one of the Abbe coefficients of the second lens.

The wide-angle lens satisfies the following conditions: 19.5<Vd ₂ /Nd ₂ <22.5; where Vd ₂ is the Abbe coefficient of one of the second lenses, and Nd ₂ is the refractive index of one of the second lenses.

The wide-angle lens satisfies the following conditions: -2.8<f ₃ /f<-1.5; where f ₃ is one of the effective focal lengths of the third lens, and f is one of the effective focal lengths of the wide-angle lens.

The sixth lens and the seventh lens are cemented.

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

The first lens has negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side, the second lens has negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side, and the third lens has negative refractive power and is double Concave lens, fourth lens is biconvex lens, fifth lens has positive refractive power and is biconvex lens, sixth lens is biconvex lens, seventh lens has negative refractive power and biconcave lens, eighth lens is biconvex lens, ninth lens is biconvex lens Convex lens.

Formula 12.7<TTL/f<12.9, which can help the lens to achieve miniaturization. The formula 19.5<Vd ₂ /Nd ₂ <22.5 can make achromatic performance better. The formula -2.8<f ₃ /f<-1.5 can provide a sufficiently strong diopter.

In order to make the above objects, features, and advantages of the present invention more comprehensible, preferred embodiments are described in detail below in conjunction 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

L18, L28, L38‧Eighth lens

L19, L29, L39 ‧‧‧ ninth lens

ST1, ST2, ST3 ‧‧‧ aperture

OF1, OF2, OF3 ‧‧‧ filter

OA1, OA2, OA3 ‧‧‧ optical axis

IMA1, IMA2, IMA3 ‧‧‧ imaging surface

S11, S12, S13, S14, S15, S16, S17

S18, S19, S110, S111, S112, S113

S114, S115, S116, S117, S118

S119, S120

S21, S22, S23, S24, S25, S26, S27

S28, S29, S210, S211, S212, S213

S214, S215, S216, S217, S218

S219, S220

S31, S32, S33, S34, S35, S36, S37

S38, S39, S310, S311, S312, S313

S314, S315, S316, S317, S318

S319, S320

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

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

FIG. 2B is a field curvature 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. 2D is a Lateral Color diagram of the first embodiment of the wide-angle lens according to the present invention.

FIG. 2E is a modulation transfer function 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 of the second embodiment of the wide-angle lens according to the present invention.

FIG. 4A is a longitudinal aberration diagram of the second embodiment of the wide-angle lens according to the present invention.

FIG. 4B is a field curvature 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. 4D is a Lateral Color diagram of the second embodiment of the wide-angle lens according to the present invention.

FIG. 4E is a modulation transfer function diagram of the second embodiment of the wide-angle lens according to the present invention.

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

FIG. 6A is a longitudinal aberration diagram of the third embodiment of the wide-angle lens according to the present invention.

FIG. 6B is a field curvature 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. 6D is a Lateral Color diagram of the third embodiment of the wide-angle lens according to the present invention.

FIG. 6E is a modulation transfer function diagram of the third embodiment of the wide-angle lens according to the present invention.

Please refer to FIG. 1, which is a schematic diagram of a lens configuration of a first embodiment of a wide-angle lens according to the present invention. The wide-angle lens 1 includes a first lens L11, a second lens L12, a third lens L13, a fourth lens L14, a fifth lens L15, a lens in order from an object side to an image side along an optical axis OA1 Aperture ST1, a sixth lens L16, a seventh lens L17, an eighth lens L18, a ninth lens L19 and a filter OF1. When imaging, the light from the object side is finally imaged on an imaging surface IMA1.

The first lens L11 is a meniscus lens with negative refractive power, its object side S11 is convex, the image side S12 is concave, and both the object side S11 and the image side S12 are spherical surfaces.

The second lens L12 is a meniscus lens with negative refractive power, its object side S13 is convex, the image side S14 is concave, and both the object side S13 and the image side S14 are spherical surfaces.

The third lens L13 is a biconcave lens with negative refractive power, its object side S15 is concave, the image side S16 is concave, and both the object side S15 and the image side S16 are spherical surfaces.

The fourth lens L14 is a biconvex lens with positive refractive power, its object side S17 is convex, the image side S18 is convex, and both the object side S17 and the image side S18 are spherical surfaces.

The fifth lens L15 is a biconvex lens with positive refractive power, its object side S19 is convex, the image side S110 is convex, and both the object side S19 and the image side S110 are spherical surfaces.

The sixth lens L16 is a biconvex lens with positive refractive power, its object side S112 is convex, the image side S113 is convex, and both the object side S112 and the image side S113 are spherical surfaces.

The seventh lens L17 is a biconcave lens with negative refractive power, its object side S113 is concave, the image side S114 is concave, and both the object side S113 and the image side S114 are spherical surfaces.

The sixth lens L16 and the seventh lens L17 are cemented.

The eighth lens L18 is a biconvex lens with positive refractive power, its object side S115 is convex, the image side S116 is convex, and both the object side S115 and the image side S116 are spherical surfaces.

The ninth lens L19 is a biconvex lens with positive refractive power, its object side S117 is convex, the image side S118 is convex, and both the object side S117 and the image side S118 are spherical surfaces.

The object side S119 and the image side S120 of the filter OF1 are both flat.

In addition, the wide-angle lens 1 in the first embodiment satisfies at least one of the following conditions: 1.55<TTL1/R1 ₁₁ <1.75 (1)

12.7<TTL1/f1<12.9 (2)

-0.4<f1 ₁₂₃ /f1 ₄₅ <-0.3 (3)

Vd1 ₂ >30 (4)

19.5<Vd1 ₂ /Nd1 ₂ <22.5 (5)

-2.8<f1 ₃ /f1<-1.5 (6)

Among them, TTL1 is the distance between the object side S11 of the first lens L11 and the imaging plane IMA1 on the optical axis OA1, R1 ₁₁ is the radius of curvature of the object side S11 of the first lens L11, and f1 is the effective focal length of the wide-angle lens 1, f1 ₃ is an effective focal length of the third lens L13, f1 ₁₂₃ is a combined effective focal length of a combination of the first lens L11, the second lens L12, and the third lens L13, and f1 ₄₅ is a combination of the fourth lens L14 and the fifth lens L15 one combination of the effective focal length, Vd1 ₂ is Abbe number of the second lens L12 one, Nd1 ₂ as one of the refractive index of the second lens L12.

By using the lens, the aperture ST1, and the design satisfying at least one of the conditions (1) to (6), the wide-angle lens 1 can effectively increase the angle of view, effectively correct aberrations, effectively correct chromatic aberrations, and effectively improve resolution.

Among them, if the value of condition (2) TTL1/f1 is greater than 12.9, it is difficult to achieve the purpose of lens miniaturization. Therefore, the value of TTL1/f1 must be at least less than 12.9, so the best effect range is 12.7<TTL1/f1<12.9, which meets the conditions for optimal lens miniaturization.

Table 1 is a table of related parameters of the lenses of the wide-angle lens 1 in FIG. 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 1.42 mm, the aperture value is equal to 2.80, the total lens length is equal to 18.2 mm, and the angle of view is equal to 200 degrees.

Table 2 is the parameter values in condition (1) to condition (6) and the calculated values of condition (1) to condition (6). As can be seen from Table 2, the wide-angle lens 1 of the first embodiment can satisfy the conditions (1) to 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 2E. FIG. 2A is a longitudinal aberration (Longitudinal Aberration) diagram of the wide-angle lens 1 of the first embodiment. FIG. 2B is a field curvature diagram of the wide-angle lens 1 of the first embodiment. Shown in FIG. 2C is a distortion diagram of the wide-angle lens 1 of the first embodiment. FIG. 2D is a lateral chromatic aberration (Lateral Color) diagram of the wide-angle lens 1 of the first embodiment. Shown in FIG. 2E is a modulation transfer function diagram of the wide-angle lens 1 of the first embodiment.

As can be seen from FIG. 2A, the wide-angle lens 1 of the first embodiment has a longitudinal aberration value between -0.02 mm and 0.02 mm for light rays with wavelengths of 0.436 μm, 0.486 μm, 0.546 μm, 0.587 μm, and 0.656 μm. between.

As can be seen from FIG. 2B, the wide-angle lens 1 of the first embodiment has a field of 0.436 μm, 0.486 μm, 0.546 μm, 0.587 μm, and 0.656 μm in the meridian (Tangential) direction and sagittal (Sagittal) direction. The curve is between -0.03mm and 0.02mm.

It can be seen from Figure 2C (the five lines in the figure almost overlap, so that there seems to be almost only one line), the wide-angle lens 1 of the first embodiment has a pair of wavelengths of 0.436 μm, 0.486 μm, 0.546 μm, 0.587 μm, 0.656 The distortion produced by μm light is between -100% and 0%.

As can be seen from the 2D graph, the wide-angle lens 1 of the first embodiment produces a lateral chromatic aberration at a maximum field angle equal to 100.0000 degrees for light with wavelengths of 0.436 μm, 0.486 μm, 0.546 μm, 0.587 μm, and 0.656 μm. The value is between -1.0 μm and 3.5 μm.

As can be seen from FIG. 2E, the wide-angle lens 1 of the first embodiment pairs the light with a wavelength ranging from 0.4360 μm to 0.6560 μm in the meridional (Tangential) direction and sagittal (Sagittal) direction, and the field of view angles are respectively 0.00 degrees , 9.50 degrees, 38.00 degrees, 47.50 degrees, 57.00 degrees, 66.50 degrees, 76.00 degrees, 85.50 degrees, 95.00 degrees, 100.00 degrees, the spatial frequency is between 0 lp/mm to 160 lp/mm, and its modulation conversion function value is between Between 0.24 and 1.0.

It is obvious that the longitudinal aberration, field curvature, distortion, and lateral chromatic aberration of the wide-angle lens 1 of the first embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.

Please refer to FIG. 3, which is a schematic diagram of a lens configuration of a second embodiment of a wide-angle lens according to the present invention. The wide-angle lens 2 includes a first lens L21, a second lens L22, a third lens L23, a fourth lens L24, a fifth lens L25, a lens in order from an object side to an image side along an optical axis OA2 A stop ST2, a sixth lens L26, a seventh lens L27, an eighth lens L28, a ninth lens L29 and a filter OF2. When imaging, the light from the object side is finally imaged on an imaging surface IMA2.

The first lens L21 is a meniscus lens with negative refractive power, the object side surface S21 is convex, the image side surface S22 is concave, and both the object side surface S21 and the image side surface S22 are spherical surfaces.

The second lens L22 is a meniscus lens with negative refractive power, its object side S23 is convex, the image side S24 is concave, and both the object side S23 and the image side S24 are spherical surfaces.

The third lens L23 is a biconcave lens with negative refractive power, its object side S25 is concave, the image side S26 is concave, and both the object side S25 and the image side S26 are spherical surfaces.

The fourth lens L24 is a biconvex lens with positive refractive power, its object side S27 is convex, the image side S28 is convex, and both the object side S27 and the image side S28 are spherical surfaces.

The fifth lens L25 is a biconvex lens with positive refractive power, its object side S29 is convex, the image side S210 is convex, and both the object side S29 and the image side S210 are spherical surfaces.

The sixth lens L26 is a biconvex lens with positive refractive power, its object side S212 is convex, the image side S213 is convex, and both the object side S212 and the image side S213 are spherical surfaces.

The seventh lens L27 is a biconcave lens with negative refractive power, its object side S213 is concave, the image side S214 is concave, and both the object side S213 and the image side S214 are spherical surfaces.

The sixth lens L26 and the seventh lens L27 are cemented.

The eighth lens L28 is a biconvex lens with positive refractive power, its object side S215 is convex, the image side S216 is convex, and both the object side S215 and the image side S216 are spherical surfaces.

The ninth lens L29 is a biconvex lens with positive refractive power, its object side S217 is convex, the image side S218 is convex, and both the object side S217 and the image side S218 are spherical surfaces.

The object side S219 and the image side S220 of the filter OF2 are both flat.

In addition, the wide-angle lens 2 in the second embodiment satisfies at least one of the following conditions: 1.55<TTL2/R2 ₁₁ <1.75 (7)

12.7<TTL2/f2<12.9 (8)

-0.4<f2 ₁₂₃ /f2 ₄₅ <-0.3 (9)

Vd2 ₂ >30 (10)

19.5<Vd2 ₂ /Nd2 ₂ <22.5 (11)

-2.8<f2 ₃ /f2<-1.5 (12)

The above definitions of f2 ₃ , f2 ₄₅ , f2 ₁₂₃ , f2, TTL2, R2 ₁₁ , Vd2 ₂ and Nd2 _{2 are} the same as f1 ₃ , f1 ₄₅ , f1 ₁₂₃ , f1 TTL1, R1 ₁₁ , Vd1 ₂ and Nd1 in the first embodiment The definitions of _{2 are} the same and will not be repeated here.

By using the lens, the aperture ST2, and the design satisfying at least one of the conditions (7) to (12), the wide-angle lens 2 can effectively increase the angle of view, effectively correct aberrations, effectively correct chromatic aberrations, and effectively improve resolution.

Among them, if the value of the condition (11) Vd2 ₂ /Nd2 ₂ is greater than 22.5, the achromatic function is poor. Therefore, the value of Vd2 ₂ /Nd2 ₂ must be at least less than 22.5, so the best effect range is 19.5<Vd2 ₂ /Nd2 ₂ <22.5, and the best achromatic condition is within this range.

Table 3 is a table of related parameters of each lens of the wide-angle lens 2 in FIG. 3. The data in Table 3 shows that the effective focal length of the wide-angle lens 2 of the second embodiment is equal to 1.43 mm, the aperture value is equal to 2.80, the total lens length is equal to 18.2 mm, and the angle of view is equal to 200 degrees.

Table 4 shows the parameter values in Condition (7) to Condition (12) and the calculated values of Condition (7) to Condition (12). As can be seen from Table 4, the wide-angle lens 2 of the second embodiment can satisfy 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 4E. FIG. 4A is a longitudinal aberration (Longitudinal Aberration) diagram of the wide-angle lens 2 of the second embodiment. FIG. 4B is a field curvature diagram of the wide-angle lens 2 of the second embodiment. Shown in FIG. 4C is a distortion diagram of the wide-angle lens 2 of the second embodiment. FIG. 4D is a lateral chromatic aberration (Lateral Color) diagram of the wide-angle lens 2 of the second embodiment. Shown in FIG. 4E is a modulation transfer function diagram of the wide-angle lens 2 of the second embodiment.

As can be seen from FIG. 4A, the wide-angle lens 2 of the second embodiment has a longitudinal aberration value between -0.01 mm and 0.015 mm for light rays with wavelengths of 0.436 μm, 0.486 μm, 0.546 μm, 0.587 μm, and 0.656 μm. between.

As can be seen from FIG. 4B, the wide-angle lens 2 of the second embodiment has a field of 0.436 μm, 0.486 μm, 0.546 μm, 0.587 μm, and 0.656 μm in the meridian (Tangential) direction and sagittal (Sagittal) direction. The curve is between -0.03mm and 0.015mm.

It can be seen from Figure 4C (the five lines in the figure almost coincide so that there is almost only one line), the wide-angle lens 2 of the second embodiment has a pair of wavelengths of 0.436 μm, 0.486 μm, 0.546 μm, 0.587 μm, 0.656 The distortion produced by μm light is between -100% and 0%.

As can be seen from Figure 4D, the wide-angle lens 2 of the second embodiment produces a lateral chromatic aberration for light rays with wavelengths of 0.436 μm, 0.486 μm, 0.546 μm, 0.587 μm, and 0.656 μm at a maximum field angle equal to 100.0000 degrees The value is between -1.0 μm and 3.5 μm.

As can be seen from FIG. 4E, the wide-angle lens 2 of the second embodiment pairs of light with a wavelength range of 0.4360 μm to 0.6560 μm, respectively in the meridional (Tangential) direction and sagittal (Sagittal) direction, the field of view angles are 0.00 degrees , 9.50 degrees, 38.00 degrees, 47.50 degrees, 57.00 degrees, 66.50 degrees, 76.00 degrees, 85.50 degrees, 95.00 degrees, 100.00 degrees, the spatial frequency is between 0 lp/mm to 160 lp/mm, and its modulation conversion function value is between Between 0.25 and 1.0.

It is obvious that the longitudinal aberration, field curvature, distortion, and lateral chromatic aberration of the wide-angle lens 2 of the second embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.

Please refer to FIG. 5, which is a schematic diagram of a lens configuration of a third embodiment of a wide-angle lens according to the present invention. The wide-angle lens 3 includes a first lens L31, a second lens L32, a third lens L33, a fourth lens L34, a fifth lens L35, a lens in order from an object side to an image side along an optical axis OA3 A stop ST3, a sixth lens L36, a seventh lens L37, an eighth lens L38, a ninth lens L39 and a filter OF3. When imaging, the light from the object side is finally imaged on an imaging surface IMA3.

The first lens L31 is a meniscus lens with negative refractive power, the object side surface S31 is convex, the image side surface S32 is concave, and both the object side surface S31 and the image side surface S32 are spherical surfaces.

The second lens L32 is a meniscus lens with negative refractive power, its object side S33 is convex, the image side S34 is concave, and both the object side S33 and the image side S34 are spherical surfaces.

The third lens L33 is a biconcave lens with negative refractive power, its object side S35 is concave, the image side S36 is concave, and both the object side S35 and the image side S36 are spherical surfaces.

The fourth lens L34 is a biconvex lens with positive refractive power, its object side S37 is convex, the image side S38 is convex, and both the object side S37 and the image side S38 are spherical surfaces.

The fifth lens L35 is a biconvex lens with positive refractive power, its object side S39 is convex, the image side S310 is convex, and both the object side S39 and the image side S310 are spherical surfaces.

The sixth lens L36 is a biconvex lens with positive refractive power, its object side S312 is convex, the image side S313 is convex, and both the object side S312 and the image side S313 are spherical surfaces.

The seventh lens L37 is a biconcave lens with negative refractive power, its object side S313 is concave, the image side S314 is concave, and both the object side S313 and the image side S314 are spherical surfaces.

The sixth lens L36 and the seventh lens L37 are cemented.

The eighth lens L38 is a biconvex lens with positive refractive power, its object side S315 is convex, the image side S316 is convex, and both the object side S315 and the image side S316 are spherical surfaces.

The ninth lens L39 is a biconvex lens with positive refractive power, its object side S317 is convex, the image side S318 is convex, and both the object side S317 and the image side S318 are spherical surfaces.

The object side S319 and the image side S320 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: 1.55<TTL3/R3 ₁₁ <1.75 (13)

12.7<TTL3/f3<12.9 (14)

-0.4<f3 ₁₂₃ /f3 ₄₅ <-0.3 (15)

Vd3 ₂ >30 (16)

19.5<Vd3 ₂ /Nd3 ₂ <22.5 (17)

-2.8<f3 ₃ /f3<-1.5 (18)

The above definitions of f3 ₃ , f3 ₄₅ , f3 ₁₂₃ , f3, TTL3, R3 ₁₁ , Vd3 ₂ and Nd3 _{2 are} the same as f1 ₃ , f1 ₄₅ , f1 ₁₂₃ , f1 TTL1, R1 ₁₁ , Vd1 ₂ and Nd1 in the first embodiment The definitions of _{2 are} the same and will not be repeated here.

By using the lens, the aperture ST3, and the design satisfying at least one of the conditions (13) to (18), the wide-angle lens 3 can effectively increase the angle of view, effectively correct aberrations, effectively correct chromatic aberrations, and effectively improve resolution.

However, if the value of the condition (18) f3 ₃ /f3 is greater than -1.5, it is difficult to provide a sufficiently strong diopter. Therefore, the value of f3 ₃ /f3 must be at least less than -1.5, so the best effect range is -2.8<f3 ₃ /f3<-1.5, and if it meets this range, it can provide a sufficiently strong diopter.

Table 5 is a table of related parameters of each lens of the wide-angle lens 3 in FIG. 5. The data in Table 5 shows that the effective focal length of the wide-angle lens 3 of the third embodiment is equal to 1.42 mm, the aperture value is equal to 2.80, the total lens length is equal to 18.2 mm, and the angle of view is equal to 200 degrees.

Table 6 is the parameter values in Condition (13) to Condition (18) and the calculated values of Condition (13) to Condition (18). From Table 6, it can be seen that the wide-angle lens 3 of the third embodiment can satisfy the conditions (13) to 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 6E. FIG. 6A shows a longitudinal aberration (Longitudinal Aberration) diagram of the wide-angle lens 3 of the third embodiment. Shown in FIG. 6B is a field curvature diagram of the wide-angle lens 3 of the third embodiment. Shown in FIG. 6C is a distortion diagram of the wide-angle lens 3 of the third embodiment. FIG. 6D is a lateral chromatic aberration (Lateral Color) diagram of the wide-angle lens 3 of the third embodiment. Shown in FIG. 6E is a modulation transfer function diagram of the wide-angle lens 3 of the third embodiment.

As can be seen from FIG. 6A, the wide-angle lens 3 of the third embodiment has a longitudinal aberration value between -0.025 mm and 0.02 mm for light rays with wavelengths of 0.436 μm, 0.486 μm, 0.546 μm, 0.587 μm, and 0.656 μm. between.

As can be seen from FIG. 6B, the wide-angle lens 3 of the third embodiment has a field of 0.436 μm, 0.486 μm, 0.546 μm, 0.587 μm, and 0.656 μm in the meridian (Tangential) direction and sagittal (Sagittal) direction. The curve is between -0.03mm and 0.02mm.

As can be seen from Figure 6C (the five lines in the figure almost coincide so that there is almost only one line), the wide-angle lens 3 of the third embodiment has a pair of wavelengths of 0.436 μm, 0.486 μm, 0.546 μm, 0.587 μm, 0.656 The distortion produced by μm light is between -100% and 0%.

It can be seen from Figure 6D that the wide-angle lens 3 of the third embodiment produces a lateral chromatic aberration for light rays with wavelengths of 0.436 μm, 0.486 μm, 0.546 μm, 0.587 μm, and 0.656 μm at a maximum field angle equal to 100.0000 degrees The value is between -0.6μm and 3.5μm.

As can be seen from FIG. 6E, the wide-angle lens 3 of the third embodiment pairs of light with a wavelength range of 0.4360 μm to 0.6560 μm, respectively in the meridian (Tangential) direction and sagittal (Sagittal) direction, the field of view angles are 0.00 degrees , 9.50 degrees, 38.00 degrees, 47.50 degrees, 57.00 degrees, 66.50 degrees, 76.00 degrees, 85.50 degrees, 95.00 degrees, 100.00 degrees, the spatial frequency is between 0 lp/mm to 160 lp/mm, and its modulation conversion function value is between Between 0.24 and 1.0.

It is obvious that the longitudinal aberration, field curvature, distortion, and lateral chromatic aberration of the wide-angle lens 3 of the third embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.

The formulas conforming to the present invention are centered on 12.7<TTL/f<12.9, 19.5<Vd ₂ /Nd ₂ <22.5, -2.8<f ₃ /f<-1.5, and the values of the embodiments of the present invention also fall within the scope of the remaining formulas Inside. Formula 12.7<TTL/f<1 2 can help the lens to achieve miniaturization. Formula 19.5<Vd ₂ /Nd ₂ <2 2 can make achromatic performance better. The formula -2.8<f ₃ /f<-1.5 can provide a sufficiently strong diopter.

Although the present invention has been disclosed as above in an embodiment, it is not intended to limit the present invention. Anyone who is familiar with this art can make various changes and modifications without departing from the spirit and scope of the present invention, so the protection of the present invention The scope shall be determined by the scope of the attached patent application.

1‧‧‧wide-angle lens

L11‧‧‧First lens

L12‧‧‧Second lens

L13‧‧‧third lens

L14‧‧‧Fourth lens

L15‧‧‧fifth lens

L16‧‧‧Sixth lens

L17‧‧‧Seventh lens

L18‧‧‧Eighth lens

L19‧‧‧Ninth lens

ST1‧‧‧Aperture

OF1‧‧‧filter

OA1‧‧‧Optical axis

IMA1‧‧‧Imaging surface

S11, S12, S13, S14, S15, S16, S17

S18, S19, S110, S111, S112, S113

S114, S115, S116, S117, S118

S119, S120

Claims (10)

A wide-angle lens includes: a first lens having refractive power, the first lens is a meniscus lens; a second lens having refractive power, the second lens is a meniscus lens; a third lens having refractive power, the third lens It includes a concave surface facing an object side; a fourth lens has a positive refractive power, the fourth lens includes a convex surface facing an image side; a fifth lens has a refractive power; a sixth lens has a positive refractive power, and the sixth lens is a biconvex lens ,; a seventh lens has refractive power; an eighth lens has positive refractive power; and a ninth lens has positive refractive power; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth The lens, the sixth lens, the seventh lens, the eighth lens, and the ninth lens are sequentially arranged along the optical axis from the object side to the image side. The wide-angle lens as described in item 1 of the patent application scope, wherein the wide-angle lens satisfies the following conditions: 1.55<TTL/R ₁₁ <1.75; wherein, TTL is the object side of the first lens to an imaging plane on the optical axis At a pitch, R _{11 is a} radius of curvature of the object side of the first lens. The wide-angle lens as described in item 1 of the patent scope, wherein the wide-angle lens satisfies the following conditions: 12.7<TTL/f<12.9; wherein, TTL is one of the object side of the first lens to an imaging plane on the optical axis Pitch, f is one of the effective focal lengths of the wide-angle lens. The wide-angle lens as described in item 1 of the patent application scope, wherein the wide-angle lens satisfies the following conditions: -0.4<f ₁₂₃ /f ₄₅ <-0.3; where f _{123 is} the first lens, the second lens, and the third lens One of the combinations has an effective focal length, and f _{45 is a} combined effective focal length of the fourth lens and the fifth lens. The wide-angle lens as described in item 1 of the patent application scope, wherein the wide-angle lens satisfies the following condition: Vd ₂ >30; wherein, Vd _{2 is} one of the Abbe coefficients of the second lens. The wide-angle lens as described in item 5 of the patent application range, wherein the wide-angle lens satisfies the following conditions: 19.5<Vd ₂ /Nd ₂ <22.5; wherein, Vd _{2 is} one of the Abbe coefficients of the second lens, and Nd _{2 is} the second The refractive index of one of the lenses. The wide-angle lens as described in item 1 of the patent application scope, wherein the wide-angle lens satisfies the following conditions: -2.8<f ₃ /f<-1.5; wherein, f _{3 is} the effective focal length of one of the third lenses, and f is one of the wide-angle lenses Effective focal length. The wide-angle lens as described in item 1 of the patent application scope, wherein the sixth lens and the seventh lens are cemented. The wide-angle lens described in item 1 or 8 of the patent application scope further includes an aperture disposed between the fifth lens and the seventh lens. The wide-angle lens as described in item 1 of the patent application scope, wherein: the first lens has negative refractive power and includes a convex surface toward the object side and a concave surface toward the image side; the second lens has negative refractive power and includes a convex surface toward the The object side and a concave surface face the image side; the third lens has negative refractive power and includes a concave surface facing the image side; the fourth lens includes a convex surface toward the object side; the fifth lens has positive refractive power and is a biconvex lens; The seventh lens has negative refractive power and is a biconcave lens; the eighth lens is a biconvex lens; and the ninth lens is a biconvex lens.

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