TWI671566B - Wide-angle lens assembly - Google Patents

Abstract

A wide-angle lens 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 a refractive power and is a meniscus lens. The second lens has a 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 a positive refractive power and includes a convex surface facing an image side. The fifth lens has refractive power. The sixth lens has positive refractive power and is a lenticular lens. The seventh lens has refractive power. The eighth lens has a positive refractive power. The ninth lens has a 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.

Description

Wide-angle lens (nineteen)

The invention relates to a wide-angle lens.

The current development trend of wide-angle lenses, in addition to the continuous development of large viewing angles and large apertures, with different application requirements, also needs to have the ability of the total length of the lens to be short and high resolution. A wide-angle lens with another new architecture is needed to meet the needs of a large viewing angle, a large aperture, a short total lens length, and high resolution.

In view of this, the main object of the present invention is to provide a wide-angle lens with a larger viewing angle, a smaller aperture value, a shorter total lens length, and a higher resolution, 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, 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 a positive refractive power. The sixth lens has a positive refractive power. The seventh lens has negative refractive power. The eighth lens has a positive refractive power. The ninth lens has a positive refractive power. Number one, two, three, four, five, six, seven, eight The nine lenses are sequentially arranged along the optical axis from the object side to the image side.

According to the present invention, a wide-angle lens is further provided, including 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 lens. Ninth lens. The first lens has a refractive power and is a meniscus lens. The second lens has a 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 lenticular lens. The seventh lens has refractive power. The eighth lens has a positive refractive power. The ninth lens has a 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 a distance from an object side of the first lens to an imaging plane on the optical axis, and R ₁₁ is a 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 a distance on the optical axis from an object side of the first lens to an imaging surface, and f is an effective focal length of the wide-angle lens.

The wide-angle lens meets the following conditions: -0.4 <f ₁₂₃ / f ₄₅ <-0.3; where f ₁₂₃ is the effective focal length of one of the 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 conditions: Vd ₂ >30; where Vd ₂ is an Abbe coefficient of the second lens.

The wide-angle lens satisfies the following conditions: 19.5 <Vd ₂ / Nd ₂ <22.5; wherein Vd ₂ is an Abbe coefficient of one of the second lenses, and Nd ₂ is a 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 an effective focal length of the third lens and f is an effective focal length 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 toward the image side. The second lens has negative refractive power and includes a convex surface facing the object side and a concave surface toward the image side. The third lens has negative refractive power and is double. Concave lens, the fourth lens is a biconvex lens, the fifth lens has a positive refractive power and is a biconvex lens, the sixth lens is a biconvex lens, the seventh lens has a negative refractive power and is a biconcave lens, the eighth lens is a biconvex lens, and the ninth lens is double Convex lens.

The formula 12.7 <TTL / f <12.9 can help reduce the size of the lens. The formula 19.5 <Vd ₂ / Nd ₂ <22.5 can make achromatic performance better. The formula -2.8 <f ₃ /f<-1.5 provides a sufficiently strong diopter.

In order to make the above-mentioned 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‧‧‧ filters

OA1, OA2, OA3 ‧‧‧ Optical axis

IMA1, IMA2, IMA3‧‧‧ imaging surface

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

S18, S19, S110, S111, S112, S113‧‧‧ faces

S114, S115, S116, S117, S118‧‧‧ faces

S119, S120‧‧‧ faces

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

S28, S29, S210, S211, S212, S213‧‧‧ faces

S214, S215, S216, S217, S218‧‧‧ faces

S219, S220‧‧‧face

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

S38, S39, S310, S311, S312, S313‧‧‧ faces

S314, S315, S316, S317, S318‧‧‧ faces

S319, S320‧‧‧ faces

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

FIG. 2D is a lateral color aberration 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 a lens configuration of a second embodiment of a wide-angle lens according to the present invention.

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

Fig. 4D is a lateral color aberration (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 a second embodiment of a wide-angle lens according to the present invention.

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

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

FIG. 6B is a Field Curvature diagram of a third embodiment of a wide-angle lens according to the present invention.

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

FIG. 6D is a lateral color aberration (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 a third embodiment of a 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, and a lens along an optical axis OA1 in order from an object side to an image side. The aperture ST1, a sixth lens L16, a seventh lens L17, an eighth lens L18, a ninth lens L19, and a filter OF1. During 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. The 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. The 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. The object side surface S15 is a concave surface, the image side surface S16 is a concave surface, and both the object side surface S15 and the image side surface S16 are spherical surfaces.

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

The fifth lens L15 is a biconvex lens with positive refractive power. The 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. The 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, and its object side S113 is The concave side, the image side S114 is a concave surface, and the object side S113 and the image side S114 are both spherical surfaces.

The sixth lens L16 is cemented with the seventh lens L17.

The eighth lens L18 is a biconvex lens with positive refractive power. The 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 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 a distance from the object side S11 of the first lens L11 to the imaging surface IMA1 on the optical axis OA1, R1 ₁₁ is a curvature radius of the object side S11 of the first lens L11, and f1 is an 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 fourth lens L14 and a fifth lens L15 One of the combinations is the effective focal length, Vd1 ₂ is an Abbe coefficient of the second lens L12, and Nd1 ₂ is a refractive index of the second lens L12.

Use the above lens, aperture ST1, and at least meet conditions (1) to (6) A conditional design enables the wide-angle lens 1 to 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. If it meets this range, it has the conditions of optimal lens miniaturization.

Table 1 is the relevant parameter table 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 1.42 mm, the aperture value is equal to 2.80, the total lens length is equal to 18.2 mm, and the viewing angle is 200 degrees.

Table 2 shows the parameter values in the conditions (1) to (6) and the calculated values of the conditions (1) to (6). As can be seen from Table 2, the wide-angle lens 1 of the first embodiment can satisfy the conditions (1) to Requirement 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 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. FIG. 2C is a distortion view of the wide-angle lens 1 of the first embodiment. 2D is a lateral color aberration diagram of the wide-angle lens 1 of the first embodiment. FIG. 2E shows a Modulation Transfer Function diagram of the wide-angle lens 1 of the first embodiment.

As can be seen in Figure 2A, the wide-angle lens 1 of the first embodiment produces longitudinal aberration values between -0.02mm and 0.02mm for light having a wavelength of 0.436μm, 0.486μm, 0.546μm, 0.587μm, and 0.656μm. between.

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

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

As can be seen from the 2D diagram, the wide-angle lens 1 of the first embodiment has a lateral chromatic aberration at a maximum field angle equal to 100.0000 degrees for a pair of light having a wavelength of 0.436 μm, 0.486 μm, 0.546 μm, 0.587 μm, and 0.656 μm. Values range from -1.0 μm to 3.5 μm.

As can be seen from Figure 2E, the wide-angle lens 1 of the first embodiment has a pair of rays with a wavelength ranging from 0.4360 μm to 0.6560 μm, respectively in the Tangential direction and the Sagittal direction, and the field 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 0.24 to 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 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, and a lens along an optical axis OA2 in order from an object side to an image side. The aperture ST2, a sixth lens L26, a seventh lens L27, an eighth lens L28, a ninth lens L29, and a filter OF2. During 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 S21 is convex, the image side S22 is concave, and both the object side S21 and the image side S22 are spherical surfaces.

The second lens L22 is a meniscus lens with negative refractive power. The 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. The object side surface S25 is a concave surface, the image side surface S26 is a concave surface, and the object side surface S25 and the image side surface S26 are spherical surfaces.

The fourth lens L24 is a biconvex lens with positive refractive power. The 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. The object side surface S29 is a convex surface, the image side surface S210 is a convex surface, and the object side surface S29 and the image side surface S210 are spherical surfaces.

The sixth lens L26 is a biconvex lens with positive refractive power. The 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. The 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 is cemented with the seventh lens L27.

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

The ninth lens L29 is a biconvex lens with positive refractive power. The object side S217 is convex, the image side S218 is convex, and 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 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 definition of _{2 is} the same and will not be repeated here.

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

Among them, if the value of condition (11) Vd2 ₂ / Nd2 ₂ is more than 22.5, the achromatic function is not good. 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 conditions are met if the range is met.

Table 3 shows the relevant parameters of each lens of the wide-angle lens 2 in Figure 3. The data in Table 3 shows that the effective focal length of the wide-angle lens 2 of the second embodiment is 1.43 mm, the aperture value is 2.80, the total lens length is 18.2 mm, and the viewing angle is 200 degrees.

Table 4 shows the parameter values in the conditions (7) to (12) and the calculated values of the conditions (7) to (12). As can be seen from Table 4, the wide-angle lens 2 of the second embodiment can satisfy the conditions (7) to Requirement 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 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. FIG. 4C is a distortion view of the wide-angle lens 2 of the second embodiment. FIG. 4D is a lateral color aberration diagram of the wide-angle lens 2 of the second embodiment. FIG. 4E is a Modulation Transfer Function diagram of the wide-angle lens 2 of the second embodiment.

As can be seen from Figure 4A, the wide-angle lens 2 of the second embodiment produces longitudinal aberration values between -0.01mm and 0.015mm for light having a wavelength of 0.436μm, 0.486μm, 0.546μm, 0.587μm, and 0.656μm. between.

It can be seen from FIG. 4B that the wide-angle lens 2 of the second embodiment has a field of wavelengths of 0.436 μm, 0.486 μm, 0.546 μm, 0.587 μm, and 0.656 μm in the Tangential and Sagittal directions. The curve is between -0.03mm and 0.015mm.

From Figure 4C (the five lines in the figure are almost superimposed so that almost only one line appears), it can be seen that the wide-angle lens 2 of the second embodiment has a wavelength of 0.436 μm, 0.486 μm, 0.546 μm, 0.587 μm, 0.656. The distortion caused by the light of μm is between -100% and 0%.

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

As can be seen in Figure 4E, the wide-angle lens 2 of the second embodiment has a pair of rays with a wavelength range of 0.4360 μm to 0.6560 μm, respectively in the Tangential direction and the Sagittal direction, and the field 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, and a lens along an optical axis OA3 in order from an object side to an image side. The aperture ST3, a sixth lens L36, a seventh lens L37, an eighth lens L38, a ninth lens L39, and a filter OF3. During 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 a convex surface, the image side surface S32 is a concave surface, and 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. The object side surface S33 is a convex surface, the image side surface S34 is a concave surface, and the object side surface S33 and the image side surface S34 are spherical surfaces.

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

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

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

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

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

The sixth lens L36 is cemented with the seventh lens L37.

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

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

The filter OF3 has a flat object side S319 and an image side S320.

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 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 definition of _{2 is} the same and will not be repeated here.

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

Among them, if the value of condition (18) f3 ₃ / f3 is larger than -1.5, it is difficult to provide a sufficiently strong refractive power. 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 sufficient power.

Table 5 is the relevant parameter table of each lens of the wide-angle lens 3 in Figure 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 viewing angle is equal to 200 degrees.

Table 6 shows the parameter values in the conditions (13) to (18) and the calculated values of the conditions (13) to (18). As can be seen from Table 6, the wide-angle lens 3 of the third embodiment can satisfy the conditions (13) to Requirement 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 is a longitudinal aberration diagram of the wide-angle lens 3 of the third embodiment. FIG. 6B is a Field Curvature diagram of the wide-angle lens 3 of the third embodiment. FIG. 6C is a distortion view of the wide-angle lens 3 of the third embodiment. FIG. 6D is a lateral color aberration diagram of the wide-angle lens 3 according to the third embodiment. FIG. 6E shows a Modulation Transfer Function diagram of the wide-angle lens 3 of the third embodiment.

As can be seen from Figure 6A, the wide-angle lens 3 of the third embodiment produces longitudinal aberration values between -0.025mm and 0.02mm for light having a wavelength of 0.436μm, 0.486μm, 0.546μm, 0.587μm, and 0.656μm. between.

It can be seen from FIG. 6B that the wide-angle lens 3 of the third embodiment has a pair of fields with wavelengths of 0.436 μm, 0.486 μm, 0.546 μm, 0.587 μm, and 0.656 μm in the Tangential direction and the Sagittal direction. The curve is between -0.03mm and 0.02mm.

From Figure 6C (the five lines in the figure are almost superimposed so that there seems to be only one line), it can be seen that the three pairs of wide-angle lenses of the third embodiment have a wavelength of 0.436 μm, 0.486 μm, 0.546 μm, 0.587 μm, 0.656 The distortion caused by the light of μm is between -100% and 0% between.

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

It can be seen from FIG. 6E that the wide-angle lens 3 of the third embodiment has a pair of rays with a wavelength ranging from 0.4360 μm to 0.6560 μm, respectively in the Tangential direction and the Sagittal direction, and the field 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 0.24 to 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 formula conformed by the present invention is 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 numerical values of the embodiments of the present invention also fall into the scope of the remaining formula Inside. Formula 12.7 <TTL / f <1 2 can help the lens to be miniaturized. The formula 19.5 <Vd ₂ / Nd ₂ <2 2 can make achromatic performance better. The formula -2.8 <f ₃ /f<-1.5 provides a sufficiently strong diopter.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make various modifications and retouches 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 attached patent application.

Claims (10)

A wide-angle lens includes: a first lens having negative refractive power, the first lens being a meniscus lens; a second lens having negative refractive power, the second lens being a meniscus lens; and a third lens having negative refractive power, the The third lens includes a concave surface facing an object side; a fourth lens having a positive refractive power, the fourth lens includes a convex surface toward an image side; a fifth lens has a positive refractive power; a sixth lens has a positive refractive power, and the sixth lens has a positive refractive power; The lens is a biconvex lens; a seventh lens has a negative refractive power; an eighth lens has a positive refractive power; and a ninth lens has a positive refractive power, the ninth lens is a biconvex lens; wherein the first lens, the second lens, the The third lens, the fourth lens, the fifth 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. A wide-angle lens includes: a first lens having negative refractive power, the first lens being a meniscus lens; a second lens having negative refractive power, the second lens being a meniscus lens; and a third lens having negative refractive power, the The third lens includes a concave surface facing an object side; a fourth lens having a positive refractive power, the fourth lens includes a convex surface toward an image side; a fifth lens has a positive refractive power; a sixth lens has a positive refractive power, and the sixth lens has a positive refractive power; The lens is a biconvex lens; a seventh lens has a negative refractive power; an eighth lens has a positive refractive power; and a ninth lens has a positive refractive power; wherein the first lens, the second lens, the third lens, and the fourth lens , The fifth 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; wherein the wide-angle lens satisfies the following conditions: 1.55 <TTL / R ₁₁ <1.75; wherein TTL is a distance from an object side of the first lens to an imaging plane on the optical axis, and R _{11 is a} radius of curvature of the object side of the first lens. A wide-angle lens includes: a first lens having negative refractive power, the first lens being a meniscus lens; a second lens having negative refractive power, the second lens being a meniscus lens; and a third lens having negative refractive power, the The third lens includes a concave surface facing an object side; a fourth lens having a positive refractive power, the fourth lens includes a convex surface toward an image side; a fifth lens has a positive refractive power; a sixth lens has a positive refractive power, and the sixth lens has a positive refractive power; The lens is a biconvex lens; a seventh lens has a negative refractive power; an eighth lens has a positive refractive power; and a ninth lens has a positive refractive power; wherein the first lens, the second lens, the third lens, and the fourth lens , The fifth 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; wherein the wide-angle lens satisfies the following conditions: 12.7 <TTL / f <12.9; where TTL is a distance on the optical axis from an object side of the first lens to an imaging surface, and f is an effective focal length of the wide-angle lens. A wide-angle lens includes: a first lens having negative refractive power, the first lens being a meniscus lens; a second lens having negative refractive power, the second lens being a meniscus lens; and a third lens having negative refractive power, the The third lens includes a concave surface facing an object side; a fourth lens having a positive refractive power, the fourth lens includes a convex surface toward an image side; a fifth lens has a positive refractive power; a sixth lens has a positive refractive power, and the sixth lens has a positive refractive power; The lens is a biconvex lens; a seventh lens has a negative refractive power; an eighth lens has a positive refractive power; and a ninth lens has a positive refractive power; wherein the first lens, the second lens, the third lens, and the fourth lens , The fifth 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; wherein the wide-angle lens satisfies the following conditions:- 0.4 <f ₁₂₃ / f ₄₅ <-0.3; where f _{123 is a} combined effective focal length of one of the first lens, the second lens, and the third lens, and f _{45 is} the fourth lens and the fifth lens One of the combinations combines the effective focal length. The wide-angle lens according to any one of claims 1 to 4, wherein the wide-angle lens satisfies the following conditions: Vd ₂ >30; wherein Vd _{2 is an} Abbe coefficient of the second lens. The wide-angle lens according to any one of claims 1 to 4, wherein 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 , F is an effective focal length of the wide-angle lens. A wide-angle lens includes: a first lens having negative refractive power, the first lens being a meniscus lens; a second lens having negative refractive power, the second lens being a meniscus lens; and a third lens having negative refractive power, the The third lens includes a concave surface facing an object side; a fourth lens having a positive refractive power, the fourth lens includes a convex surface toward an image side; a fifth lens has a positive refractive power; a sixth lens has a positive refractive power, and the sixth lens has a positive refractive power; The lens is a biconvex lens; a seventh lens has a negative refractive power; an eighth lens has a positive refractive power; and a ninth lens has a positive refractive power; wherein the first lens, the second lens, the third lens, and the fourth lens , The fifth 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; wherein the wide-angle lens satisfies the following condition: Vd ₂ >30; 19.5 <Vd ₂ / Nd ₂ <22.5; wherein Vd _{2 is an} Abbe coefficient of the second lens, and Nd _{2 is a} refractive index of the second lens. The wide-angle lens according to item 1 of the scope of patent application, wherein the sixth lens and the seventh lens are cemented. The wide-angle lens according to item 1 or 8 of the scope of patent application, further comprising an aperture disposed between the fifth lens and the seventh lens. The wide-angle lens according to item 1 of the patent application scope, wherein: the first lens includes a convex surface toward the object side and a concave surface toward the image side; the second lens includes a convex surface toward the object side and a concave surface toward the image The third lens includes a concave surface toward the image side; the fourth lens includes a convex surface toward the object side; the fifth lens is a biconvex lens; the seventh lens is a biconcave lens; and the eighth lens is a biconvex lens .