TWI719232B - 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 and a fifth lens. The first lens is a meniscus lens with negative refractive power. The second lens is with positive refractive power and includes a convex surface facing an object side. The third lens is with positive refractive power and includes a convex surface facing an image side. The fourth lens is with positive refractive power and includes a convex surface facing an object side. The fifth lens is with negative refractive power and includes a concave surface facing the object side and a convex surface facing the image side. The first lens, the second lens, the third lens, the fourth lens and the fifth lens are arranged in order from the object side to the image side along an optical axis.

Description

Wide-angle lens

The invention relates to a wide-angle lens.

The development trend of today’s wide-angle lenses, in addition to the continuous development towards miniaturization, large field of view, and large aperture, with different application requirements, it also needs to have the ability to withstand severe environmental temperature changes. Conventional imaging lenses can no longer meet the requirements of today’s Demands require another imaging lens with a new architecture to meet the needs of miniaturization, large field of view, large aperture, and resistance to severe environmental temperature changes.

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 small aperture value, resistance to severe 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, and a fifth lens. The first lens has negative refractive power and is a meniscus lens. The second lens has positive refractive power and includes a convex surface facing an object side. The third lens has positive refractive power and includes a convex surface facing an image side. The fourth lens has positive refractive power and includes a convex surface facing the object side. The fifth lens has negative refractive power and includes a concave surface facing the object side and a convex surface facing the image side. The first lens, the second lens, the third lens, the fourth lens and the fifth lens are arranged in order from the object side to the image side along an optical axis.

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

The first lens may further include a convex surface facing the object side, the second lens may further include a convex surface facing the image side, the third lens may further include a concave surface facing the object side, and the fourth lens may further include a convex surface facing the image side.

The first lens may further include a concave surface facing the image side, the second lens may further include a concave surface facing the image side, the third lens may further include a convex surface facing the object side, and the fourth lens may further include a convex surface facing the image side.

90；其中，Vd₁為第一透鏡之一阿貝係數，Vd₂為第二透鏡之一阿貝係數。 The wide-angle lens meets the following conditions: Vd ₁ +Vd ₂

90; where Vd ₁ is one of the Abbe coefficients of the first lens, and Vd ₂ is one of the Abbe coefficients of the second lens.

20；其中，Vd₃為第三透鏡之一阿貝係數，Vd₄為第四透鏡之一阿貝係數。 The wide-angle lens meets the following conditions: Vd ₄ -Vd ₃

20; where Vd ₃ is one of the Abbe coefficients of the third lens, and Vd ₄ is one of the Abbe coefficients of the fourth lens.

0.55；其中，AAG為第一透鏡至一成像面於光軸上之一所有空氣間距總合，TTL為第一透鏡之一物側面至成像面於光軸上之一間距。 The wide-angle lens meets the following conditions: AAG/TTL

0.55; where AAG is the sum of all the air distances between the first lens and an imaging surface on the optical axis, and TTL is the distance between an object side of the first lens and the imaging surface on the optical axis.

BFL/TTL

0.38；其中，BFL為第五透鏡之一像側面至一成像面於光軸上之一間距，TTL為第一透 鏡之一物側面至成像面於光軸上之一間距。 The wide-angle lens meets the following conditions: 0.28

BFL/TTL

0.38; where BFL is a distance from an image side of the fifth lens to an imaging surface on the optical axis, and TTL is a distance from an object side of the first lens to the imaging surface on the optical axis.

0.23；其中，Nd₃為第三透鏡之一折射率，Nd₄為第四透鏡之一折射率。 The wide-angle lens meets the following conditions: Nd ₃ -Nd ₄

0.23; Among them, Nd ₃ is a refractive index of the third lens, and Nd ₄ is a refractive index of the fourth lens.

f₂/f₃

1.3；其中，f₂為第二透鏡之一有效焦距，f₃為第三透鏡之一有效焦距。 The wide-angle lens meets the following conditions: 0.9

f ₂ /f ₃

1.3; where f ₂ is an effective focal length of the second lens, and f ₃ is an effective focal length of the third lens.

|f₁/f|

1.6；其中，f₁為第一透鏡之一有效焦距，f為廣角鏡頭之一有效焦距。 The wide-angle lens meets the following conditions: 1.2

|f ₁ /f|

1.6; Among them, f ₁ is an effective focal length of the first lens, and f is an effective focal length of a wide-angle lens.

The fourth lens and the fifth lens are cemented with each other, and there is an aperture between the first lens and the second lens.

In order to make the above-mentioned objects, features, and advantages of the present invention more obvious and understandable, preferred embodiments are described in detail below in conjunction with the accompanying drawings.

1, 2, 3, 4: wide-angle lens

L11, L21, L31, L41: the 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

ST1, ST2, ST3, ST4: aperture

OF1, OF2, OF3, OF4: filter

OA1, OA2, OA3, OA4: Optical axis

IMA1, IMA2, IMA3, IMA4: imaging surface

S11, S12, S13, S14, S15: surface

S16, S17, S18, S19, S110: surface

S111, S112: Noodles

S21, S22, S23, S24, S25: surface

S26, S27, S28, S29, S210: surface

S211, S212: Noodles

S31, S32, S33, S34, S35: surface

S36, S37, S38, S39, S310: surface

S311, S312: Noodles

S41, S42, S43, S44, S45: surface

S46, S47, S48, S49, S410: surface

S411, S412: Noodles

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 diagram of the first embodiment of the wide-angle lens according to the present invention.

Figure 2B is a Field Curvature diagram of the first embodiment of the wide-angle lens according to the present invention.

Figure 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 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 curve diagram of the second embodiment of the wide-angle lens according to the present invention.

Figure 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 of the 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 curve 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 of the fourth embodiment of the wide-angle lens according to the present invention.

Fig. 8A is a longitudinal aberration diagram of the fourth embodiment of the wide-angle lens according to the present invention.

FIG. 8B is a field curve 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, which is a schematic diagram of the lens configuration of the first embodiment of the wide-angle lens according to the present invention. The wide-angle lens 1 includes a first lens L11, an aperture ST1, a second lens L12, a third lens L13, a fourth lens L14, and a fifth lens in order from an object side to an image side along an optical axis OA1. Lens L15 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 and is made of glass. The object side surface S11 is a convex surface, the image side surface S12 is a concave surface, and both the object side surface S11 and the image side surface S12 are spherical surfaces.

The second lens L12 is a biconvex lens with positive refractive power and is made of glass. The object side surface S14 is a convex surface, the image side surface S15 is a convex surface, and both the object side surface S14 and the image side surface S15 are spherical surfaces.

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

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

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

The fourth lens L14 and the fifth lens L15 are cemented with each other.

The object side surface S111 and the image side surface S112 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:

Among them, Vd1 ₁ is the Abbe coefficient of the first lens L11, Vd1 ₂ is the Abbe coefficient of the second lens L12, Vd1 ₃ is the Abbe coefficient of the third lens L13, and Vd1 ₄ is one of the fourth lens L14 Abbe number, AAG1 is the sum of all air distances between the first lens L11 and the imaging surface IMA1 on the optical axis OA1, TTL1 is the distance between the object side S11 of the first lens L11 and the imaging surface IMA1 on the optical axis OA1 BFL1 is a distance from the image side surface S110 of the fifth lens L15 to the imaging surface IMA1 on the optical axis OA1, Nd1 ₃ is a refractive index of the third lens L13, Nd1 ₄ is a refractive index of the fourth lens L14, f ₁ is An effective focal length of the first lens L11, f ₂ is an effective focal length of the second lens L12, f ₃ is an effective focal length of the third lens L13, and f1 is an effective focal length of the wide-angle lens 1.

Using the above-mentioned lens, aperture ST1, and a design that meets at least one of the conditions (1) to (7), the wide-angle lens 1 can effectively increase the field of view, shorten the total length of the lens, effectively reduce the aperture value, and effectively correct aberrations , Resistance to severe environmental temperature changes.

f1₂/f1₃

1.3，符合該範圍則具有最佳修正像差條件且有助於降低敏感度。 If the value of condition (6) f1 ₂ /f1 ₃ is greater than 1.3, the function of correcting aberrations is poor. Therefore, _{the value of f1 2} /f1 ₃ must be at least less than or equal to 1.3, so the best effect range is 0.9

f1 ₂ /f1 ₃

1.3. If this range is met, it has the best condition for correcting aberrations and helps reduce sensitivity.

Table 1 is a table of related 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 3.126 mm, the aperture value is equal to 1.96, and the total lens length is equal to 17.787 mm.

Table 2 shows the parameter values of conditions (1) to (7) and the calculated values of conditions (1) to (7). It can be seen from Table 2 that the wide-angle lens 1 of the first embodiment can all satisfy the conditions (1) to The requirement of condition (7).

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 Figures 2A to 2C. FIG. 2A shows a longitudinal aberration diagram of the wide-angle lens 1 of the first embodiment. Figure 2B shows the field curvature of the wide-angle lens 1 of the first embodiment. FIG. 2C shows a distortion (Distortion) diagram of the wide-angle lens 1 of the first embodiment.

It can be seen from Figure 2A that the wide-angle lens 1 of the first embodiment has longitudinal aberrations between -0.005mm and 0.026mm for light with wavelengths of 0.470μm, 0.510μm, 0.555μm, 0.610μm, and 0.650μm. between.

It can be seen from Figure 2B that the wide-angle lens 1 of the first embodiment has a field of light with wavelengths of 0.470μm, 0.510μm, 0.555μm, 0.610μm, 0.650μm in the Tangential direction and the Sagittal direction. The curve is between -0.09mm to 0.03mm.

From Figure 2C (the five lines in the figure are almost overlapped, so that there is only one line), it can be seen that the wide-angle lens 1 of the first embodiment has wavelengths of 0.470μm, 0.510μm, 0.555μm, 0.610μm, 0.650μm The distortion produced by the light is between -54% and 0%.

It is obvious that the longitudinal aberration, curvature of field, 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, which is a schematic diagram of the lens configuration of the second embodiment of the wide-angle lens according to the present invention. The wide-angle lens 2 includes a first lens L21, an aperture ST2, a second lens L22, a third lens L23, a fourth lens L24, and a fifth lens in order from an object side to an image side along an optical axis OA2. Lens L25 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 and is made of glass. The object side surface S21 is a convex surface, the image side surface S22 is a concave surface, and both the object side surface S21 and the image side surface S22 are spherical surfaces.

The second lens L22 is a biconvex lens with positive refractive power and is made of glass. The object side surface S24 is a convex surface, the image side surface S25 is a convex surface, and both the object side surface S24 and the image side surface S25 are spherical surfaces.

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

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

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

The fourth lens L24 and the fifth lens L25 are cemented with each other.

The object side surface S211 and the image side surface S212 of the filter OF2 are both flat surfaces.

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

The above definitions of Vd2 ₁ , Vd2 ₂ , Vd2 ₃ , Vd2 ₄ , AAG2, TTL2, BFL2, Nd2 ₃ , Nd2 ₄ , f2 ₁ , f2 ₂ , f2 ₃ and f2 are the same as those of Vd1 ₁ , Vd1 ₂ , Vd1 in the first embodiment _{3. The} definitions of Vd1 ₄ , AAG1, TTL1, BFL1, Nd1 ₃ , Nd1 ₄ , f1 ₁ , f1 ₂ , f1 ₃ and f1 are the same, and are not repeated here.

Utilizing the above lens, aperture ST2, and a design that meets at least one of the conditions (8) to (14), the wide-angle lens 2 can effectively increase the field of view, shorten the total length of the lens, effectively reduce the aperture value, and effectively correct aberrations , Resistance to severe environmental temperature changes.

|f2₁/f2|

1.6，符合該範圍則可在廣角光學特性與鏡頭製造性間取得較好的平衡，其中，若f2₁/f2的絕對值趨大，則可得到較佳的鏡頭製造性，若f2₁/f2的絕對值趨小，則可得到較高的周邊解像性能。 If the absolute value of condition (14) f2 ₁ /f2 is less than 1.2, the manufacturability of the lens is poor. Therefore, _{the absolute value of f2 1} /f2 must be at least greater than or equal to 1.2, so the best effect range is 1.2

|f2 ₁ /f2|

1.6. Within this range, a better balance can be achieved between wide-angle optical characteristics and lens manufacturability. Among them, if _{the absolute value of f2 1} /f2 becomes larger, better lens manufacturability can be obtained. If f2 ₁ /f2 When the absolute value of is smaller, higher peripheral resolution performance can be obtained.

Table 3 is a table of 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 equal to 2.872 mm, the aperture value is equal to 2.0, and the total lens length is equal to 17.7 mm.

Table 4 shows the parameter values of conditions (8) to (14) and the calculated values of conditions (8) to (14). It can be seen from Table 4 that the wide-angle lens 2 of the second embodiment can all satisfy the conditions (8) to The requirement of condition (14).

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 Figures 4A to 4C. FIG. 4A shows a longitudinal aberration diagram of the wide-angle lens 2 of the second embodiment. Figure 4B shows the field curvature of the wide-angle lens 2 of the second embodiment. Figure 4C shows a distortion (distortion) diagram of the wide-angle lens 2 of the second embodiment.

It can be seen from Fig. 4A that the wide-angle lens 2 of the second embodiment has longitudinal aberration values between -0.035mm and 0.03mm for light with wavelengths of 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm, and 0.650 μm. between.

It can be seen from Figure 4B that the wide-angle lens 2 of the second embodiment has a field of light with wavelengths of 0.470μm, 0.510μm, 0.555μm, 0.610μm, 0.650μm in the Tangential direction and the Sagittal direction. The curve is between -0.08mm and 0.03mm.

It can be seen from Figure 4C (the five lines in the figure almost overlap, so that there is only one line), it can be seen that the wide-angle lens 2 of the second embodiment has wavelengths of 0.470μm, 0.510μm, 0.555μm, 0.610μm, 0.650μm The distortion produced by the light is between -60% and 0%.

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

Please refer to FIG. 5, which is a schematic diagram of the lens configuration of the third embodiment of the wide-angle lens according to the present invention. The wide-angle lens 3 includes a first lens L31, an aperture ST3, a second lens L32, a third lens L33, a fourth lens L34, and a fifth lens in order from an object side to an image side along an optical axis OA3. Lens L35 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 and is made of glass. The object side surface S31 is a convex surface, the image side surface S32 is a concave surface, and both the object side surface S31 and the image side surface S32 are spherical surfaces.

The second lens L32 is a biconvex lens with positive refractive power and is made of glass material. The object side surface S34 is a convex surface, the image side surface S35 is a convex surface, and both the object side surface S34 and the image side surface S35 are spherical surfaces.

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

The fourth lens L34 is a biconvex lens with positive refractive power and is made of glass. The object side surface S38 is a convex surface, the image side surface S39 is a convex surface, and both the object side surface S38 and the image side surface S39 are spherical surfaces.

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

The fourth lens L34 and the fifth lens L35 are cemented with each other.

The object side surface S311 and the image side surface S312 of the filter OF3 are both flat surfaces.

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

Above _{Vd3 1, Vd3 2, Vd3 3} , Vd3 4, AAG3, TTL3, BFL3, Nd3 3, Nd3 4, f3 1, f3 2, defined f3 and _{f3. 3} of the first embodiment Vd1 _1, Vd1 _2, Vd1 _{3. The} definitions of Vd1 ₄ , AAG1, TTL1, BFL1, Nd1 ₃ , Nd1 ₄ , f1 ₁ , f1 ₂ , f1 ₃ and f1 are the same, and are not repeated here.

Using the above-mentioned lens, aperture ST3 and a design that meets at least one of the conditions (15) to (21), the wide-angle lens 3 can effectively increase the field of view, shorten the total length of the lens, effectively reduce the aperture value, and effectively correct aberrations. , Resistance to severe environmental temperature changes.

90，符合該範圍則具有最佳消色差條件。 If the value of condition (15) Vd3 ₁ +Vd3 ₂ is less than 90, the achromatic function is poor. Therefore, _{the value of Vd3 1} +Vd3 ₂ must be at least greater than or equal to 90, so the best effect range is Vd3 ₁ +Vd3 ₂

90. If it meets this range, it has the best achromatic condition.

Table 5 is a table of related parameters 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 3.29mm, the aperture value is equal to 2.0, and the total lens length is equal to 18.173mm.

Table 6 shows the values of the parameters in Condition (15) to Condition (21) and the calculated values of Condition (15) to Condition (21). It can be seen from Table 6 that the wide-angle lens 3 of the third embodiment can all satisfy the conditions (15) to The requirement of condition (21).

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 Figures 6A to 6C. Fig. 6A shows a longitudinal aberration diagram of the wide-angle lens 3 of the third embodiment. FIG. 6B shows a field curvature diagram of the wide-angle lens 3 of the third embodiment. Figure 6C shows a distortion (distortion) diagram of the wide-angle lens 3 of the third embodiment.

It can be seen from Fig. 6A that the wide-angle lens 3 of the third embodiment has longitudinal aberration values of -0.005mm to 0.055mm for light with wavelengths of 0.470μm, 0.510μm, 0.555μm, 0.610μm, and 0.650μm. between.

It can be seen from Figure 6B that the wide-angle lens 3 of the third embodiment has a field of light with wavelengths of 0.470μm, 0.510μm, 0.555μm, 0.610μm, 0.650μm in the Tangential direction and the Sagittal direction. The curve is between -0.09mm to 0.02mm.

It can be seen from Figure 6C (the five lines in the figure are almost overlapped, so that there is only one line), it can be seen that the wide-angle lens 3 of the third embodiment has wavelengths of 0.470μm, 0.510μm, 0.555μm, 0.610μm, 0.650μm The distortion produced by the light is between -60% and 0%.

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

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

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

The second lens L42 is a meniscus lens with positive refractive power and is made of glass material. The object side surface S44 is a convex surface, the image side surface S45 is a concave surface, and both the object side surface S44 and the image side surface S45 are spherical surfaces.

The third lens L43 is a biconvex lens with positive refractive power and is made of glass. The object side surface S46 is a convex surface, the image side surface S47 is a convex surface, and both the object side surface S46 and the image side surface 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 surface S48 is a convex surface, the image side surface S49 is a convex surface, and both the object side surface S48 and the image side surface S49 are spherical surfaces.

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

The fourth lens L44 and the fifth lens L45 are cemented with each other.

The object side S411 and the image side S412 of the filter OF4 are both flat surfaces.

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

The above-mentioned definitions of Vd4 ₁ , Vd4 ₂ , Vd4 ₃ , Vd4 ₄ , AAG4, TTL4, BFL4, Nd4 ₃ , Nd4 ₄ , f4 ₁ , f4 ₂ , f4 ₃ and f4 are the same as those of Vd1 ₁ , Vd1 ₂ , Vd1 in the first embodiment _{3. The} definitions of Vd1 ₄ , AAG1, TTL1, BFL1, Nd1 ₃ , Nd1 ₄ , f1 ₁ , f1 ₂ , f1 ₃ and f1 are the same, and are not repeated here.

Using the above-mentioned lens, aperture ST4, and a design that satisfies at least one of the conditions (22) to (28), the wide-angle lens 4 can effectively increase the field of view, shorten the total length of the lens, effectively reduce the aperture value, and effectively correct aberrations. , Resistance to severe environmental temperature changes.

20，符合該範圍則具有最佳消色差條件。 If the value of condition (23) Vd4 ₄ -Vd4 ₃ is less than 20, the achromatic function is not good. Therefore, _{the value of Vd4 4} -Vd4 ₃ must be at least greater than or equal to 20, so the best effect range is Vd4 ₄ -Vd4 ₃

20. If it meets this range, it has the best achromatic condition.

Table 7 is a table of related parameters of each lens of the wide-angle lens 4 in Figure 7. The data in Table 7 shows that the effective focal length of the wide-angle lens 4 of the fourth embodiment is equal to 3.33 mm, the aperture value is equal to 2.0, and the total lens length is equal to 17.918 mm.

Table 8 shows the values of the parameters in Condition (22) to Condition (28) and the calculated values of Condition (22) to Condition (28). From Table 8 it can be seen that the wide-angle lens 4 of the fourth embodiment can all satisfy the conditions (22) to The requirement of condition (28).

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 Figures 8A to 8C. FIG. 8A shows a longitudinal aberration (Longitudinal Aberration) diagram of the wide-angle lens 4 of the fourth embodiment. FIG. 8B shows a field curvature diagram of the wide-angle lens 4 of the fourth embodiment. FIG. 86C shows a distortion (Distortion) diagram of the wide-angle lens 4 of the fourth embodiment.

It can be seen from Fig. 8A that the wide-angle lens 4 of the fourth embodiment has longitudinal aberration values between -0.015mm and 0.065mm for light with wavelengths of 0.470μm, 0.510μm, 0.555μm, 0.610μm, and 0.650μm. between.

It can be seen from Figure 8B that the wide-angle lens 4 of the fourth embodiment has a field of light with wavelengths of 0.470μm, 0.510μm, 0.555μm, 0.610μm, 0.650μm in the Tangential direction and the Sagittal direction. The curve is between -0.03mm to 0.10mm.

It can be seen from Figure 8C (the five lines in the figure are almost overlapped, so that there is only one line), it can be seen that the wide-angle lens 4 of the fourth embodiment has wavelengths of 0.470μm, 0.510μm, 0.555μm, 0.610μm, 0.650μm The distortion produced by the light is between -67% and 0%.

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

f₂/f₃

1.3、1.2

|f₁/f|

1.6、Vd₁+Vd₂

90、Vd₄-Vd₃

20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0.9

f₂/f₃

1.3，可使整體像差修正表現有助益。公式 1.2

|f₁/f|

1.6，可使廣角光學特性與鏡頭製造性間取得的平衡表現有助益。公式Vd₁+Vd₂

90，可使消色差表現較佳，其最佳合適範圍為118

Vd₁+Vd₂

90。公式Vd₄-Vd₃

20，可使消色差表現較佳，其最佳合適範圍為35

Vd₄-Vd₃

20。 The formula in accordance with the present invention is 0.9

f ₂ /f ₃

1.3, 1.2

|f ₁ /f|

1.6, Vd ₁ +Vd ₂

90, Vd ₄ -Vd ₃

20 is the center, and the numerical value of the embodiment of the present invention also falls within the range of other formulas. Formula 0.9

f ₂ /f ₃

1.3, can make the overall aberration correction performance helpful. Formula 1.2

|f ₁ /f|

1.6, the balance between wide-angle optical characteristics and lens manufacturability can be beneficial. Formula Vd ₁ +Vd ₂

90, can make achromatic performance better, the best suitable range is 118

Vd ₁ +Vd ₂

90. Formula Vd ₄ -Vd ₃

20, can make achromatic performance better, the best suitable range is 35

Vd ₄ -Vd ₃

20.

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 subject to those defined by the attached patent scope.

1‧‧‧Wide-angle lens

L11‧‧‧First lens

L12‧‧‧Second lens

L13‧‧‧Third lens

L14‧‧‧Fourth lens

L15‧‧‧Fifth lens

ST1‧‧‧Aperture

OF1‧‧‧Filter

OA1‧‧‧Optical axis

IMA1‧‧‧imaging surface

S11, S12, S13, S14, S15‧‧‧surface

S16, S17, S18, S19, S110‧‧‧face

S111, S112‧‧‧Noodles

Claims (10)

A wide-angle lens, comprising: a first lens with negative refractive power, the first lens is a meniscus lens; a second lens with positive refractive power, the second lens includes a convex surface facing an object side; a third lens with positive refractive power , The third lens includes a convex surface facing an image side; a fourth lens has a positive refractive power, the fourth lens includes a convex surface facing the object side; and a fifth lens has a negative refractive power, the fifth lens includes a concave surface facing The object side and a convex surface face the image side; wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens follow from the object side to the image side along an optical axis Order; Among them, the wide-angle lens meets the following conditions: AAG/TTL

0.55; Nd ₃ -Nd ₄

0.23; 0.9

f ₂ /f ₃

1.3; where AAG is the sum of all air distances between the first lens and an imaging surface on the optical axis, TTL is the distance between an object side of the first lens and the imaging surface on the optical axis, Nd _{3 is a} refractive index of the third lens, Nd _{4 is a} refractive index of the fourth lens, f _{2 is} an effective focal length of the second lens, and f _{3 is} an effective focal length of the third lens. A wide-angle lens, comprising: a first lens with negative refractive power, the first lens is a meniscus lens; a second lens with positive refractive power, the second lens includes a convex surface facing an object side; a third lens with positive refractive power , The third lens includes a convex surface facing an image side; a fourth lens has a positive refractive power, the fourth lens includes a convex surface facing the object side; and a fifth lens has a negative refractive power, the fifth lens includes a concave surface facing The object side and a convex surface face the image side; wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens follow from the object side to the image side along an optical axis Order; Among them, the wide-angle lens meets the following conditions: AAG/TTL

0.55; Vd ₄ -Vd ₃

20; 0.9

f ₂ /f ₃

1.3; Wherein, AAG is the sum of all air distances from the first lens to an imaging surface on the optical axis, and TTL is the distance from an object side of the first lens to the imaging surface on the optical axis, Vd _{3 is an} Abbe number of the third lens, Vd _{4 is an} Abbe number of the fourth lens, f _{2 is} an effective focal length of the second lens, and f _{3 is} an effective focal length of the third lens. A wide-angle lens, comprising: a first lens with negative refractive power, the first lens is a meniscus lens; a second lens with positive refractive power, the second lens includes a convex surface facing an object side; a third lens with positive refractive power , The third lens includes a convex surface facing an image side; a fourth lens has a positive refractive power, the fourth lens includes a convex surface facing the object side; and a fifth lens has a negative refractive power, the fifth lens includes a concave surface facing The object side and a convex surface face the image side; wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens follow from the object side to the image side along an optical axis Order; Among them, the wide-angle lens meets the following conditions: Nd ₃ -Nd ₄

0.23; 0.9

f ₂ /f ₃

1.3; where Nd _{3 is a} refractive index of the third lens, Nd _{4 is a} refractive index of the fourth lens, f _{2 is} an effective focal length of the second lens, and f _{3 is} an effective focal length of the third lens focal length. A wide-angle lens, comprising: a first lens with negative refractive power, the first lens is a meniscus lens; a second lens with positive refractive power, the second lens includes a convex surface facing an object side; a third lens with positive refractive power , The third lens includes a convex surface facing an image side; a fourth lens has a positive refractive power, the fourth lens includes a convex surface facing the object side; and a fifth lens has a negative refractive power, the fifth lens includes a concave surface facing The object side and a convex surface face the image side; wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens follow from the object side to the image side along an optical axis Arranged in order; the wide-angle lens meets the following conditions: Vd ₄ -Vd ₃

20; 0.9

f ₂ /f ₃

1.3; where Vd _{3 is an} Abbe coefficient of the third lens, Vd _{4 is an} Abbe coefficient of the fourth lens, f _{2 is} an effective focal length of the second lens, and f _{3 is an} Abbe coefficient of the third lens An effective focal length. The wide-angle lens according to any one of items 1 to 4 of the scope of patent application, wherein the first lens further includes a convex surface facing the object side, and the second lens further includes a convex surface facing the image side, The third lens further includes a concave surface facing the object side, and the fourth lens further includes a convex surface facing the image side. The wide-angle lens described in any one of items 1 to 4 of the scope of patent application, wherein the first lens further includes a concave surface facing the image side, the second lens further includes a concave surface facing the image side, and the third lens The lens further includes a convex surface facing the object side, and the fourth lens further includes a convex surface facing the image side. The wide-angle lens described in any one of items 1 to 4 of the scope of patent application, wherein the wide-angle lens satisfies the following conditions: Vd ₁ +Vd ₂

90; where Vd _{1 is an} Abbe coefficient of the first lens, and Vd _{2 is an} Abbe coefficient of the second lens. For the wide-angle lens described in any one of items 1 to 4 of the scope of patent application, the wide-angle lens meets the following conditions: 1.2

|f ₁ /f|

1.6; where f _{1 is} an effective focal length of the first lens, and f is an effective focal length of the wide-angle lens. The wide-angle lens described in any one of items 1 to 4 of the scope of patent application, wherein the wide-angle lens satisfies the following conditions: 0.28

BFL/TTL

0.38; where BFL is a distance from an image side of the fifth lens to an imaging surface on the optical axis, and TTL is a distance from an object side of the first lens to the imaging surface on the optical axis. The wide-angle lens described in any one of items 1 to 4 of the scope of patent application, wherein the fourth lens and the fifth lens are cemented with each other, and there is an aperture between the first lens and the second lens, and the wide-angle lens Meet the following conditions: Vd ₁ +Vd ₂

90; 1.2

|f ₁ /f|

1.6; 0.28

BFL/TTL

0.38; where Vd _{1 is an} Abbe number of the first lens, Vd _{2 is an} Abbe number of the second lens, f _{1 is} an effective focal length of the first lens, and f is an effective focal length of the wide-angle lens , BFL is a distance from an image side surface of the fifth lens to an imaging surface on the optical axis, and TTL is a distance from an object side surface of the first lens to the imaging surface on the optical axis.

Images