TWI709778B - Lens assembly - Google Patents

Abstract

A lens assembly includes a lens housing, a first lens, a second lens, a third lens, and a fourth lens. The lens housing includes a lens barrel. The first lens includes an object side surface and an image side surface, whereine the object side surface protrudes outward along the optical axis, a middle portion of the cross-section along the optical axis is higher than that of two side edges, the middle portion protrudes toward an object side to form a columnar shape, and includes a first portion near a small diameter which is close to the object side and a second portion near a large diameter which is close to an image side, wherein a step difference is formed between the first portion and the second portion. The lens assembly includes a small diameter portion near the object side and a large diameter portion near the image side. The lens assembly satisfies the following condition: 0<A/B

Description

Lens

The invention relates to the field of optics, and more specifically, to a lens.

At present, many electronic devices such as mobile phones and tablet computers are equipped with front lenses. FIG. 1 is a schematic diagram of the structure of the lens 100 in the prior art, and FIG. 2 is a partial cross-sectional view of the lens 100 in the prior art. As shown in FIGS. 1 and 2, the lens 100 includes a mirror chamber 101 and a plurality of lenses arranged in the mirror chamber 101. The lens closest to the object side is the first lens 102. The first lens 102 is entirely contained in the mirror chamber 101, and the highest point of its optical effective diameter is lower than the end surface of the mirror chamber 101 toward the object side. In this kind of lens, the first lens 102 occupies a lot of space in the mirror chamber 101, and the viewing angle is limited, and the mirror chamber 101 contains the first lens 102 as a whole, resulting in a thicker lens.

In view of this, the technical problem to be solved by the present invention is to provide a lens that can further reduce the total length, volume and thickness of the lens and has a wider Viewing angle and good optical performance.

The lens of the present invention includes a mirror chamber and a first lens, a second lens, a third lens and a fourth lens which are sequentially fixed in the mirror chamber from an object side to an image side along an optical axis. The mirror room includes a lens barrel. The first lens is the lens closest to the object side and includes an object side and an image side The side surface of the object protrudes outward along the optical axis and the cross section along the optical axis is higher in the middle part than the side parts on both sides, and the middle part is convex toward the object side and forms a column shape, including the small side closer to the object side. The first part of the diameter and the second part of the large diameter near the image side form a step between the first part and the second part. The lens includes a small diameter part near the object side and a large diameter part near the image side. The diameter of the small diameter part and the large diameter part of the lens are different, and the lens meets the following conditions: 0<A/B<0.3; A is the maximum outer diameter of the small diameter first part of the first lens, and B is the maximum outer diameter of the large diameter part of the lens.

Another lens of the present invention includes a lens chamber and a first lens, a second lens, a third lens, and a fourth lens arranged in order from an object side to an image side along an optical axis. The first lens has positive refractive power and includes an object side surface and an image side surface. The second lens has negative refractive power. The third lens has refractive power. The fourth lens has negative refractive power. The lens satisfies the following conditions: 2.5mm ² <G1xf1<8mm ² ; where f1 is a focal length of the first lens, and G1 is the center vertex of the object side of the first lens to the effective diameter edge of the image side of the first lens on the optical axis A distance above. The lens includes a small-diameter lens portion near the object side and a large-diameter lens portion near the image side, and the small-diameter lens portion and the large-diameter lens portion have different diameters. The first lens, the second lens, the third lens and the fourth lens are sequentially fixed in the mirror chamber along the optical axis from the object side to the image side.

The lens barrel includes a large diameter part close to the image side and a small diameter part close to the object side. A stepped surface is formed between the two. The small diameter part of the lens is formed by the small diameter part of the lens barrel, and the large diameter part of the lens is formed by the lens. The large diameter part of the tube is formed. The peripheral portion of the first lens is fixed in the large diameter portion of the lens barrel, and the optically effective diameter portion is located in the small diameter portion of the lens barrel. The lens may further include a cover connected to the object side end of the lens barrel, the cover has an opening, and the cover forms an aperture structure in front of the object side of the first lens.

The object side of the first lens is flush with or slightly lower than the object side of the cover, the lens barrel and the cover are integrally formed, and the opening of the cover is circular or polygonal or non-circular or polygonal or symmetrical to the optical axis. Bottle-shaped or oak barrel-shaped.

The lens barrel includes an end surface facing the object side, the end surface is provided with a first lens fixing hole, the peripheral part is fixed in the lens barrel, and the part of the optical effective diameter portion protrudes from the first lens fixing hole. The small diameter part of the lens is formed by the part of the optical effective diameter part of the first lens, the large diameter part of the lens is formed by the lens barrel, and the edge of the object side of the first lens forms an aperture structure of the lens.

A/B

0.28；其中A是第一透鏡的小直徑的第一部分的最大外徑，B是鏡頭大徑部的最大外徑。 The first lens includes an optical effective diameter part and a peripheral part for supporting and fixing, and the lens satisfies the following conditions: 0.19

A/B

0.28; where A is the maximum outer diameter of the small diameter first part of the first lens, and B is the maximum outer diameter of the large diameter part of the lens.

2.2mm；h

0.8mm；0.8>h/H

0.22；0<S1/S2<0.25；其中h是鏡頭小徑部於光軸上的一厚度，H是整個該鏡頭於光軸上的一厚度，S1是鏡頭小徑部的一橫截面面積，S2是鏡頭大徑部的一橫截面面積。 The shape of the small-diameter part of the lens is circular or polygonal or non-circular, or a polygonal or bottle-shaped or oak barrel-shaped symmetrical to the optical axis. The shape of the large-diameter part of the lens is circular or polygonal or non-circular or in line with the optical axis Symmetrical polygon or bottle shape or oak barrel shape, the lens meets at least one of the following conditions: 0<A

2.2mm; h

0.8mm; 0.8>h/H

0.22; 0<S1/S2<0.25; where h is a thickness of the small diameter part of the lens on the optical axis, H is a thickness of the entire lens on the optical axis, S1 is a cross-sectional area of the small diameter part of the lens, S2 is a cross-sectional area of the large diameter part of the lens.

0.38。 The object side of the first lens is convex, f1 is a focal length of the first lens, L1D is an optical effective diameter of the object side of the first lens, and L1T is a distance from the object side to the image side of the first lens on the optical axis. Distance, EFL is the effective focal length of the lens, TTL is the distance from the object side of the first lens to an imaging surface on the optical axis, ALT is the sum of the thickness of each lens on the optical axis, C is the small diameter of the lens The maximum outer diameter of the lens; the lens can meet at least one of the following conditions: 0<f1/L1T<5;0.8<L1D/L1T<1.7;1<EFL/L1T<4;1.9<EFL/L1D<2.6; 2 mm<(L1D+L1T)<5mm;3<(EFL+TTL)/L1T<9;1.5<ALT/L1T<3.5;0<C/B

0.38.

It may further include a fifth lens with positive refractive power. The fifth lens is located between the first lens and the second lens. The object side of the first lens is convex, and the second lens includes an object side and an image side. The five lens includes an object side and an image side. The image side of the fifth lens is convex. L1T is the distance from the object side of the first lens to the image side on the optical axis, and L2T is the second lens from the object side to the image side. A distance on the optical axis, L5T is a distance from the object side of the fifth lens to the image side on the optical axis, and the lens meets the following conditions: 0.29mm<L1T-L5T-L2T<0.89mm.

The object side surface of the first lens is convex, the third lens includes an object side surface and an image side surface, the fourth lens includes an object side surface and an image side surface, the third lens has positive refractive power, and the image side surface of the third lens is convex. The image side surface of the fourth lens is concave.

In order to make the above-mentioned objects, features, and advantages of the present invention more obvious and understandable, the following specifically describes preferred embodiments in conjunction with the accompanying drawings.

100, 20, 30‧‧‧ lens

101, 21, 31‧‧‧Mirror Room

102、L1‧‧‧First lens

211, 311‧‧‧lens tube

211a‧‧‧Dajing Department

211b‧‧‧Small diameter

211c‧‧‧Step surface

212‧‧‧Lid

212a‧‧‧Open

L1-a‧‧‧Optical effective diameter part

L1-b‧‧‧peripheral part

A‧‧‧Maximum outer diameter of the first part of the small diameter of the first lens

B‧‧‧Maximum outer diameter of the major diameter part of the lens

C‧‧‧Maximum outer diameter of the small diameter part of the lens barrel near the object side

H‧‧‧The thickness of the lens on the optical axis

h‧‧‧The thickness of the small diameter of the lens

311a‧‧‧First lens fixing hole

40, 50, 60, 70, 80, 90, 100, 110, 120‧‧‧ lens

ST1, ST2, ST3, ST4, ST5, ST6, ST7, ST8, ST9‧‧‧Aperture

L11, L21, L31, L41, L51, L61, L71, L81, L91‧‧‧First lens

L35, L45, L55, L65, L75, L85, L95‧‧‧Fifth lens

L12, L22, L32, L42, L52, L62, L72, L82, L92‧‧‧Second lens

L13, L23, L33, L43, L53, L63, L73, L83, L93‧‧‧Third lens

L14, L24, L34, L44, L54, L64, L74, L84, L94‧‧‧Fourth lens

OF1, OF2, OF3, OF4, OF5, OF6, OF7, OF8, OF9‧‧‧Filter

IMA1, IMA2, IMA3, IMA4, IMA5, IMA6, IMA7, IMA8, IMA9‧‧‧imaging surface

OA‧‧‧Optical axis

S1‧‧‧Aperture surface

S2‧‧‧Object side of the first lens

S3‧‧‧The first lens image side

S10‧‧‧Fifth lens object side

S11‧‧‧Fifth lens image side

S4‧‧‧Object side of second lens

S5‧‧‧Second lens image side

S6‧‧‧Object side of third lens

S7‧‧‧Third lens image side

S8‧‧‧Fourth lens object side

S9‧‧‧Fourth lens image side

S12‧‧‧The side of the filter object

S13‧‧‧Filter image side

S14‧‧‧Image surface

Figure 1 is a schematic diagram of the structure of a lens in the prior art.

Figure 2 is a partial cross-sectional view of a lens in the prior art.

Figure 3 is a schematic diagram of the structure of the lens according to the present invention.

Fig. 4A is a partial cross-sectional view of the lens according to the present invention.

FIG. 4B is a schematic diagram of another structure of the lens according to the present invention.

Figure 5 is a schematic structural diagram of another embodiment of the lens according to the present invention.

Fig. 6 is a partial cross-sectional view of another embodiment of the lens according to the present invention.

Fig. 7 is a schematic diagram of the lens configuration of the first embodiment of the lens according to the present invention.

Fig. 8A is a field curvature diagram of the lens of Fig. 7.

Fig. 8B is a distortion diagram of the lens of Fig. 7.

Fig. 9 is a schematic diagram of the lens configuration of the second embodiment of the lens according to the present invention.

Fig. 10A is a field curvature diagram of the lens of Fig. 9.

Fig. 10B is a distortion diagram of the lens of Fig. 9.

FIG. 11 is a schematic diagram of the lens configuration and optical path of the third embodiment of the lens according to the present invention.

Fig. 12A is a field curvature diagram of the lens of Fig. 11.

Fig. 12B is a distortion diagram of the lens of Fig. 11.

FIG. 13 is a schematic diagram of the lens configuration and optical path of the fourth embodiment of the lens according to the present invention.

Fig. 14A is a field curvature diagram of the lens of Fig. 13.

Fig. 14B is a distortion diagram of the lens of Fig. 13.

FIG. 15 is a schematic diagram of the lens configuration and optical path of the fifth embodiment of the lens according to the present invention.

Fig. 16A is a field curvature diagram of the lens of Fig. 15.

Fig. 16B is a distortion diagram of the lens of Fig. 15.

FIG. 17 is a schematic diagram of the lens configuration and optical path of the sixth embodiment of the lens according to the present invention.

Fig. 18A is a field curvature diagram of the lens of Fig. 17.

Figure 18B is a distortion diagram of the lens of Figure 17.

Fig. 19 is a schematic diagram of the lens configuration and optical path of the seventh embodiment of the lens according to the present invention.

Fig. 20A is a field curvature diagram of the lens of Fig. 19.

Fig. 20B is a distortion diagram of the lens of Fig. 19.

FIG. 21 is a schematic diagram of the lens configuration and optical path of the eighth embodiment of the lens according to the present invention.

FIG. 22 is a schematic diagram of the lens configuration and optical path of the ninth embodiment of the lens according to the present invention.

In order to make the objectives, technical solutions, and advantages of the present invention clearer, the following further describes the present invention in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

FIG. 3 is a schematic structural diagram of the lens 20 according to the present invention; FIG. 4A is a partial cross-sectional view of the lens 20 according to the present invention. As shown in FIGS. 3 and 4A, in the first embodiment of the present invention, the lens 20 includes a mirror chamber 21 and a plurality of lenses that are sequentially fixed in the mirror chamber 21 along the optical axis OA from the object side to the image side. A lens. The first lens L1 is the lens closest to the object side, and the thickness of the first lens L1 on the optical axis is the thickest among multiple lenses. The lens thickness is the distance from the object side of the lens to the image side on the optical axis, that is, the The thickness of one lens L1 on the optical axis is more than 1.4 times the thickness of the other lenses on the optical axis. The thickness of the first lens L1 on the optical axis is the distance from the object side to the image side of the first lens L1 on the optical axis. Distance, the thickness of the other lenses on the optical axis is the distance from the object side of the other lenses to the image side on the optical axis. ALT is the sum of the thickness of each lens on the optical axis, that is, the object side of each lens The sum of the distances from the image side to the optical axis OA meets the condition: the thickness of the first lens L1 on the optical axis is 1.4 times or more than the thickness of the other lenses on the optical axis or 1.5<ALT/L1T<3.5; Under the premise that the total length (TTL) is shortened and the first lens L1 protrudes from the object side of the lens chamber 21, the lens 20 can have the characteristics of high pixel, high resolution and good optical performance, especially a kind of application for full-screen display (high Screen-to-body ratio) the front lens of the mobile phone.

The mirror chamber 21 includes a lens barrel 211 and a cover 212 connected to the object side end of the lens barrel 211. The cover 212 is ring-shaped, the cover 212 is provided with an opening 212a, and the opening 212a is circular. The lens barrel 211 may be integrally formed with the cover 212. The opening 212a can also be polygonal in addition to being circular. As shown in Figure 4B. However, the present invention is not limited to this, and the opening 212a may also be non-circular, polygonal symmetrical to the optical axis, bottle shape or oak barrel shape.

The lens barrel 211 can be cylindrical, or other shapes such as polygons as shown in the figure, including a large-diameter portion 211a close to the image side and a small-diameter portion 211b close to the object side. A stepped surface 211c is formed between them, and the stepped surface 211c is a surface facing the object side. In other words, the large-diameter portion 211a and the small-diameter portion 211b have a stepped surface 211c to form a step as a whole, and the cross-section along the optical axis is roughly It is L-shaped, and the small-diameter portion 211b, the stepped surface 211c, and the large-diameter portion 211a form a stepped structure from the object side to the image side. Therefore, the stepped surface 211c can also be called a stepped surface or a stepped surface.

The first lens L1 is disposed in the lens barrel 211 close to the object side end of the lens barrel 211, and is fixed in the lens barrel 211 by interference fit or adhesive. In the illustrated embodiment, the cross section of the first lens L1 along the optical axis is convex, that is, the cross section of the first lens L1 along the optical axis is higher in the middle part than on both sides, and the middle part is convex toward the object side. Compared with the two sides, it forms a column shape, and the middle part and the two sides form a step. It includes a first part with a small diameter near the object side and a second part with a large diameter near the image side. The first part is the largest The outer diameter is significantly smaller than the maximum outer diameter of the second part, thereby forming a significant step difference between the first part and the second part. More preferably, the maximum outer diameter of the second part is more than 1.3 times the maximum outer diameter of the first part. The first lens L1 includes an optical effective diameter portion L1-a and a peripheral portion L1-b for supporting and fixing. A part of the optical effective diameter part L1-a is located in the first part of the small diameter, and the other part is located in the second part of the large diameter. The peripheral portion L1-b is located in the second portion of the large diameter and is fixed in the large diameter portion 211a of the lens barrel 211, and the image side portion of the optical effective diameter portion L1-a is located in the large diameter portion 211a of the lens barrel 211, The object side part of the optical effective diameter part L1-a is located in the small diameter part 211b. Above The cross-section of the first lens L1 may also have other shapes, such as a non-circular shape, a polygonal shape symmetrical to the optical axis, a bottle shape, an oak barrel shape, or the upper half of a wine bottle.

The object side surface of the first lens L1 protrudes outward along the optical axis OA and is flush with or slightly lower than the object side surface of the cover 212. The diameter of the opening 212a on the cover 212 is slightly smaller than or equal to the outer diameter of the first lens L1. This structure forms an aperture structure in front of the object side of the first lens L1.

In this embodiment, the lens 20 as a whole also forms two parts with different diameters, namely the small diameter part near the object side and the large diameter part near the image side. The small diameter part of the lens is defined by the small diameter part 211b of the lens barrel 211. The large diameter portion of the lens is formed by the large diameter portion 211 a of the lens barrel 211. The shape of the small-diameter lens portion 211b may be a circle or a polygon, and the shape of the large-diameter lens portion 211a may be a circle or a polygon. However, the present invention is not limited to this, and the shapes of the small-diameter lens portion 211b and the large-diameter lens portion 211a may also be non-circular, polygonal symmetrical to the optical axis, bottle shape, or oak barrel shape.

In this embodiment, the lens 20 satisfies at least one of the following conditional expressions:

0<A/B<0.3 (1)

0<S1/S2<0.25 (5)

In the above conditional formula, A is the maximum outer diameter of the first part of the small diameter of the first lens L1; B is the maximum outer diameter of the large diameter portion of the lens, in this embodiment, it is the large diameter portion 211a of the mirror chamber 21 H is the thickness of the small diameter portion of the lens, in this embodiment, that is, the thickness of the small diameter portion 211b of the mirror chamber 21 on the optical axis OA, that is, the object side end surface of the small diameter portion to the step surface 211c The distance on the optical axis OA; H is the thickness of the entire lens 20 on the optical axis OA, that is, the distance from the object side end surface of the small diameter part to the image side end surface of the large diameter part on the optical axis OA. S1 is the cross-sectional area of the small diameter part of the lens, and S2 is the cross-sectional area of the large diameter part of the lens.

0.19，0.19

A/B

0.28。 More preferably, 0<S1/S2

0.19, 0.19

A/B

0.28.

In this embodiment, the lens 20 also satisfies the following conditions:

Where C is the maximum outer diameter of the small diameter portion 211b of the lens barrel 211 close to the object side, that is, the maximum outer diameter of the small diameter portion of the lens. In other words, the diameter value of C is the first lens including the small diameter of the first lens L1. The maximum outer diameter A of a part and the wall thickness of the cover 212.

When the lens 20 meets the above conditions, the first lens L1 can have a small effective diameter, high pixels, and high resolution.

FIG. 5 is another structural diagram of the lens 30 according to the present invention; FIG. 6 is another partial cross-sectional view of the lens 30 according to the present invention. In this embodiment, the same parts as the above-mentioned embodiment will not be repeated. As shown in FIGS. 5 and 6, in another embodiment of the present invention, the lens 30 includes a mirror chamber 31, and a plurality of lenses that are sequentially fixed in the mirror chamber 31 from the object side to the image side along the optical axis OA. A lens. The first lens L1 is the lens closest to the object side.

The mirror chamber 31 includes a lens barrel 311. The lens barrel 311 is cylindrical. On the end surface of the lens barrel 311 facing the object side, a first lens fixing hole 311a is provided. The first lens L1 is fixed in the lens barrel 311 and protrudes from the first lens fixing hole 311a, and its object side protrudes outward along the optical axis OA, that is, a part of the object side of the first lens L1 protrudes from the lens barrel 311 The object side end face. In the illustrated embodiment, the cross section of the first lens L1 along the direction of the optical axis OA is convex, and includes an optically effective diameter portion L1-a and a peripheral portion L1-b for supporting and fixing. The peripheral part L1-b is fixed at In the lens barrel 311, the image side portion of the optical effective diameter portion L1-a is located in the lens barrel 311, and the object side portion of the optical effective diameter portion L1-a protrudes from the first lens fixing hole 311a. It is understandable that the shape of the first lens fixing hole 311a can be a circle, but is not limited to a circle, and can also be other shapes such as a polygon, a non-circle, a polygon symmetrical to the optical axis, a bottle shape or an oak barrel shape. Wait.

In this embodiment, the edge of the object side of the first lens L1 forms the aperture structure of the lens 30. More preferably, the peripheral surface of the part of the first lens L1 protruding from the lens barrel 311 can be printed, blackened or fogged, and a light-blocking layer structure is formed on the peripheral surface to reduce interference caused by light incident from there.

In this embodiment, the lens 30 as a whole also forms two parts with different diameters, namely the small diameter part near the object side and the large diameter part near the image side. The small diameter part of the lens is close to the object side by the first lens L1. The small diameter first part is formed, and the large diameter part of the lens is formed by the lens barrel 311. The shape of the small diameter part of the lens may be circular or polygonal, and the shape of the large diameter part of the lens may be circular or polygonal. However, the present invention is not limited to this, and the shapes of the small-diameter part and the large-diameter part of the lens may also be non-circular, polygonal symmetrical to the optical axis, bottle shape or oak barrel shape.

In this embodiment, the lens 30 satisfies at least one of the following conditional formulas (1)-(5):

0<A/B<0.3; (1)

0<S1/S2<0.25 (5)

In the above conditional formula, A is the first part of the small diameter of the first lens L1 Maximum outer diameter; B is the maximum outer diameter of the large-diameter portion of the lens, in this embodiment, that is, the outer diameter of the lens barrel 311; h is the thickness of the small-diameter portion of the lens, in this embodiment, that is, the first lens L1 protrudes from the thickness of the lens barrel 311 on the optical axis OA, that is, the distance from the object side of the first lens L1 to the first lens fixing hole 311a on the optical axis OA, H is the thickness of the entire lens 30 on the optical axis OA , That is, the distance from the object side surface of the first lens L1 to the image side end surface of the lens barrel 311 on the optical axis OA. S1 is the cross-sectional area of the small diameter part of the lens, and S2 is the cross-sectional area of the large diameter part of the lens.

0.19，0.19

A/B

0.28。 More preferably, 0<S1/S2

0.19, 0.19

A/B

0.28.

When the lens 30 satisfies the above conditions, it can achieve a wide angle of view, a small effective diameter of the first lens L1, high pixels and high resolution.

In the above embodiments, the protrusions of the first lens L1 from the small diameter portion of the lens are all greater than or equal to 0.8 mm, and the outer diameter of the small diameter portion of the lens is all less than 2.2 mm. In order to achieve this size and maintain the required optical performance, a number of embodiments are used as examples for description below.

In the following embodiments, the cross-section of the first lens L1 is convex, that is, the cross-section of the first lens L1 along the optical axis is higher at the middle part than on both sides, and the middle part is convex toward the object side and is more than the two sides. The sides form a column, and the middle and both sides form a step difference, but for the sake of brevity, in the optical system of Figures 7, 9, 11, 13, 15, 17, and 19, only the optical system is shown. The optically effective diameter part, the peripheral part is not shown. The cross-section of the first lens L1 may also have other shapes, such as a non-circular shape, a polygonal shape symmetrical to the optical axis, a bottle shape, an oak barrel shape, or the upper half of a red wine bottle.

Fig. 7 is a schematic diagram of the lens configuration of the first embodiment of the lens according to the present invention. As shown in FIG. 7, the lens 40 includes an aperture ST1, a first lens L11, a second lens L12, a third lens L13, a fourth lens L14, and a filter OF1 in order from the object side to the image side along the optical axis OA. , And the imaging surface IMA1.

The first lens L11 has positive refractive power. The first lens L11 is a biconvex lens, the object side surface S2 is a convex surface, and the image side surface S3 is a convex surface. The first lens L11 may be made of glass.

The second lens L12 has negative refractive power. The second lens L12 is a meniscus lens, the object side surface S4 is a convex surface, and the image side surface S5 is a concave surface. The second lens L12 may be made of plastic.

The third lens L13 has positive refractive power. The third lens L13 is a meniscus lens, the object side surface S6 is a concave surface, and the image side surface S7 is a convex surface. The third lens L13 may be made of plastic.

The fourth lens L14 has negative refractive power. The fourth lens L14 is a biconcave lens, the object side surface S8 is concave and has an inflection point, and the image side surface S9 is concave and has an inflection point. The fourth lens L14 may be made of plastic.

The object side S12 and the image side S13 of the filter OF1 are both flat surfaces.

At least one of the first to fourth lenses L11-L14 may have an aspheric surface, and the aspheric surface concavity z is obtained by the following formula:

z=ch ² /{1+[1-(k+1)c ² h ² ] ^1/2 }+Ah ⁴ +Bh ⁶ +Ch ⁸ +Dh ¹⁰ +Eh ¹² +Eh ¹⁴ +Gh ¹⁶

Among them, c is the curvature; h is the vertical distance from any point on the lens surface to the optical axis; k is the conic coefficient; A~G are the aspheric coefficients.

The lens 40 satisfies at least one of the following conditional expressions:

0.8<L1D/L1T<1.7 (7)

0<f1/L1T<5 (8)

1<EFL/L1T<4 (9)

1.9<EFL/L1D<2.6 (10)

2mm<(L1D+L1T)<5mm (11)

3<(EFL+TTL)/L1T<9 (12)

1.5<ALT/L1T<3.5 (13)

2.5mm ² <G1xf1<8mm ² (14)

Where L1D is the optical effective diameter of the object side S2 of the first lens L11; L1T is the thickness of the first lens L11 on the optical axis, that is, the distance from the object side S2 of the first lens L11 to the image side S3 on the optical axis OA. f1 is the focal length of the first lens L11, and EFL is the effective focal length of the lens 40. TTL is the total length of the lens group of the lens 40, that is, the distance from the object side S2 of the first lens L11 to the imaging surface IMA1 on the optical axis OA. ALT is the sum of the thickness of each lens on the optical axis, that is, the sum of the distance from the object side of each lens to the image side on the optical axis OA, G1 is the convex length of the first lens L11, that is, the length of the first lens L11 The distance on the optical axis from the center vertex of the object side surface S2 to the effective diameter edge of the image side surface S3 of the first lens L11.

When the lens 40 satisfies at least one of the above conditional expressions, it can be ensured that the outer diameter of the small diameter part of the lens and the optical effective diameter of the first lens L11 are less than 2.2 mm, and the entire lens 40 can maintain good optical performance. Among them, the conditional expression (14): 2.5mm ² <G1xf1<8mm ² ; it is the relationship between the convex length of the first lens and the focal length, and the convex length G1 relates to the convexity of the first lens along the optical axis. The effect of the glyph and the step difference between the first part and the second part, that is, the amount of protrusion of the object side of the first lens along the optical axis of the G1 data, and the cross section along the optical axis is in the middle part than on both sides The side is high, the middle part is convex toward the object side and forms a column, and the effect of the step difference between the first part and the second part is affected. In addition, the focal length f1 of the first lens is related to the convergence effect of the optical path. Affect the imaging quality of the overall optical system. If this conditional formula is satisfied, it can be more ensured that the optical effective diameter of the first lens is less than 2.2mm and the protrusion of the first lens from the small diameter part of the lens is greater than or equal to 0.8mm While maintaining good optical performance, it is also indirectly related to conditional expression (1): 0<A/B<0.3; conditional expression (2): 0<A≦2.2; conditional expression (3): h≧0.8mm; Relatedly, since A is the largest outer diameter of the first part of the small diameter of the first lens, conditional expressions (14), (1), (2) and (3) have the same purpose and satisfy conditional expressions (14), ( 1), (2) and (3) are to ensure that the optical effective diameter of the first lens is less than 2.2mm, and that the protrusion of the first lens from the small diameter part of the lens is greater than or equal to 0.8mm and has good optics performance.

It can be understood that the cross-section of the first lens L11 is not limited to a circular shape, and may also be other shapes such as non-circular, polygonal, polygonal symmetrical to the optical axis, bottle shape or oak barrel shape.

Table 1 is a table of related parameters of each lens of the lens 40 in FIG. 7. The effective focal length EFL of the lens 40 is equal to 2.55mm, the aperture value is equal to 2, the total lens length TTL is equal to 3.92mm, the field of view is equal to 78 degrees, the optical effective diameter L1D of the object side S2 of the first lens L11 is equal to 1.28mm, and the first lens L11 The thickness L1T on the optical axis is equal to 1.10mm, the total thickness of each lens ALT is equal to 2.25mm, the focal length of the first lens L11 is 2.94mm, the focal length of the second lens L12 is -5.43mm, and the focal length of the third lens L13 is 0.87mm, the focal length of the fourth lens L14 is -0.93mm. The convex length G1 of the first lens L11 is equal to 1 mm. The maximum outer diameter B of the major diameter part of the lens is equal to 6.6 mm.

Table 2 is a table of related parameters of the aspheric surface of each lens of the lens 40 in Figure 7, where k is the Conic Constant, and A~G are the aspheric coefficients.

In this embodiment, the cross section of the first lens L11 is circular, and the optically effective diameter L1D of the object side surface S2 is equal to the maximum outer diameter A of the first part of the small diameter of the first lens L11. According to the calculation, A/B=1.28/6.6=0.1939, which satisfies the conditional formula (1). It can be seen from Table 1 and Table 2 that in lens 40, L1D/L1T=1.28/1.10=1.16, f1/L1T=2.94/1.10=2.67, EFL/L1T=2.55/1.10=2.32, EFL/L1D=2.55/1.28= 1.99, L1D+L1T=1.28+1.10=2.38mm, (EFL+TTL)/L1T=(2.55+3.92)/1.10=5.88, ALT/L1T=2.25/1.10=2.05, G1xf1=1x2.94=2.94mm ² . It can meet the requirements of conditional formulas (7)-(14).

In addition, the optical performance of the lens 40 can also meet the requirements, which can be seen from Figure 8A See Figure 8B. Figure 8A is the field curvature diagram of the lens 40 in Figure 7; Figure 8B is the distortion diagram of the lens 40 in Figure 7; it can be seen from Figure 8A that the field curvature of the lens 40 ranges from -0.14mm to 0.02mm between. It can be seen from Fig. 8B that the distortion of the lens 40 is between -0.2% and 1.6%. In addition, through experiments, the value of the modulation transfer function of the lens 40 is between 0.17 and 1.0. It is obvious that the field curvature and distortion of the lens 40 can be effectively corrected, and the lens resolution (Resolution) can also meet the requirements, thereby obtaining better optical performance.

Fig. 9 is a schematic diagram of the lens configuration of the second embodiment of the lens according to the present invention. As shown in FIG. 9, the lens 50 includes an aperture ST2, a first lens L21, a second lens L22, a third lens L23, a fourth lens L24, and a filter OF2 in order from the object side to the image side along the optical axis OA. , And the imaging surface IMA2.

The first lens L21 has positive refractive power. The first lens L21 is a biconvex lens, the object side surface S2 is a convex surface, and the image side surface S3 is a convex surface. The first lens L21 may be made of glass.

The second lens L22 has negative refractive power. The second lens L22 is a meniscus lens, the object side surface S4 is a convex surface, and the image side surface S5 is a concave surface. The second lens L22 may be made of plastic.

The third lens L23 has positive refractive power. The third lens L23 is a meniscus lens, the object side surface S6 is a concave surface, and the image side surface S7 is a convex surface. The third lens L23 may be made of plastic.

The fourth lens L24 has negative refractive power. The fourth lens L24 is a biconcave lens, the object side surface S8 is concave and has an inflection point, and the image side surface S9 is concave and has an inflection point. The fourth lens L24 may be made of plastic.

The object side surface S22 and the image side surface S23 of the filter OF2 are both flat surfaces.

It can be understood that the cross-section of the first lens L21 is not limited to a circle, but can also be other shapes such as non-circular, polygonal, polygonal symmetrical to the optical axis, bottle-shaped or oak. Barrel shape.

At least one of the first to fourth lenses L21-L24 may have an aspheric surface, and the aspheric surface concavity z is obtained by the following formula:

z=ch ² /{1+[1-(k+1)c ² h ² ] ^1/2 }+Ah ⁴ +Bh ⁶ +Ch ⁸ +Dh ¹⁰ +Eh ¹² +Fh ¹⁴ +Gh ¹⁶

Among them, c is the curvature; h is the vertical distance from any point on the lens surface to the optical axis; k is the conic coefficient; A~G are the aspheric coefficients.

When the lens 50 satisfies at least one of the conditional expressions (7)-(14), it can be ensured that the outer diameter of the small diameter portion of the lens and the optical effective diameter of the first lens L21 are less than 2.2 mm, and the entire lens 50 can maintain Good optical performance.

Table 3 is a table of related parameters of each lens of the lens 50 in Figure 9. The effective focal length EFL of the lens 50 is equal to 2.63mm, the aperture value is equal to 2, the total lens length TTL is equal to 3.95mm, the field of view is equal to 75 degrees, the optical effective diameter L1D of the object side S2 of the first lens L21 is equal to 1.32mm, and the first lens L21 The thickness L1T on the optical axis is equal to 1.09mm, the total thickness of each lens ALT is equal to 2.44mm, the focal length of the first lens L21 is 3.08mm, the focal length of the second lens L22 is -9.04mm, and the focal length of the third lens L23 is 0.99mm, the focal length of the fourth lens L24 is -0.96mm. The convex length G1 of the first lens L21 is equal to 1 mm. The maximum outer diameter B of the major diameter part of the lens is equal to 6.6 mm.

Table 4 is a table of related parameters of the aspheric surface of each lens of the lens 50 in Figure 9, where k is the Conic Constant, and A~G are the aspheric coefficients.

In this embodiment, the cross section of the first lens L21 is circular, and the optically effective diameter L1D of the object side surface S2 is equal to the maximum outer diameter A of the first part of the small diameter of the first lens L21. According to the calculation, A/B=1.32/6.6=0.2, which satisfies the conditional formula (1). From Table 3 and Table 4, in the lens 50, L1D/L1T=1.32/1.09=1.21, f1/L1T=3.08/1.09=2.83, EFL/L1T=2.63/1.09=2.41, EFL/L1D=2.63/1.32= 1.99, L1D+L1T=1.32+1.09=2.41mm, (EFL+TTL)/L1T=(2.63+3.95)/1.09=6.04, ALT/L1T=2.44/1.09=2.24, G1xf1=1x3.08=3.08mm ² , Can meet the requirements of conditional expressions (7)-(14).

In addition, the optical performance of the lens 50 can also meet the requirements, which can be seen from Figures 10A to 10B. Figure 10A is the field curvature diagram of the lens 50 in Figure 9; Figure 10B is the distortion diagram of the lens 50 in Figure 9; it can be seen from Figure 10A that the field curvature of the lens 50 is between -0.02mm and 0.06mm between. It can be seen from Figure 10B that the distortion of the lens 50 is between -0.5% and 1.8%. In addition, through experiments, the value of the modulation transfer function of the lens 50 is between 0.36 and 1.0. It is obvious that the field curvature and distortion of the lens 50 can be effectively corrected, and the lens resolution (Resolution) can also meet the requirements, thereby obtaining better optical performance.

Fig. 11 is a schematic diagram of the lens configuration of the third embodiment of the lens according to the present invention. As shown in FIG. 11, the lens 60 includes an aperture ST3, a first lens L31, a fifth lens L35, a second lens L32, a third lens L33, and a fourth lens L34 in order from the object side to the image side along the optical axis OA. , Filter OF3, and imaging surface IMA3.

The first lens L31 has positive refractive power. The first lens L31 is a biconvex lens, the object side surface S2 is a convex surface, and the image side surface S3 is a convex surface. The first lens L31 may be made of glass.

The fifth lens L35 has positive refractive power. The fifth lens L35 is a meniscus lens, the object side surface S10 is a concave surface, and the image side surface S11 is a convex surface. The fifth lens L35 may be made of plastic.

The second lens L32 has negative refractive power. The second lens L32 is a meniscus lens, the object side surface S4 is concave, and the image side surface S5 is convex. The second lens L32 may be made of plastic.

The third lens L33 has positive refractive power. The third lens L33 is a biconvex lens, the object side surface S6 is a convex surface, and the image side surface S7 is a convex surface. The third lens L33 may be made of plastic.

The fourth lens L34 has negative refractive power. The fourth lens L34 is a meniscus lens, the object side surface S8 is convex and has an inflection point, and the image side surface S9 is concave and has an inflection point. The fourth lens L34 may be made of plastic.

The object side S12 and the image side S13 of the filter OF3 are both flat surfaces.

It can be understood that the cross-section of the first lens L31 is not limited to a circular shape, and may also have other shapes such as a non-circular shape, a polygonal shape, a polygonal shape symmetrical to the optical axis, a bottle shape, or an oak barrel shape.

At least one of the first, fifth, second, third, and fourth lenses L31, L35, L32, L33, L34 may have an aspheric surface, and the aspheric surface concavity z is obtained by the following formula:

z=ch ² /{1+[1-(k+1)c ² h ² ] ^1/2 }+Ah ⁴ +Bh ⁶ +Ch ⁸ +Dh ¹⁰ +Eh ¹² +Fh ¹⁴ +Gh ¹⁶

Among them, c is the curvature; h is the vertical distance from any point on the lens surface to the optical axis; k is the conic coefficient; A~G are the aspheric coefficients.

When the lens 60 satisfies at least one of the conditional expressions (7)-(14), it can be ensured that the outer diameter of the small-diameter portion of the lens and the optical effective diameter of the first lens L31 are less than 2.2 mm, and the first lens L31 follows the lens The protrusion amount of the small diameter portion of the barrel or the protrusion amount from the lens barrel is greater than or equal to 0.8 mm, and the entire lens 60 can maintain good optical performance.

Table 5 is a table of related parameters of each lens of the lens 60 in Figure 11. The effective focal length EFL of the lens 60 is equal to 3.175mm, the aperture value is equal to 2.25, the total lens length TTL is equal to 4.327mm, the field of view is equal to 76.7 degrees, the optical effective diameter L1D of the object side S2 of the first lens L31 is equal to 1.436mm, and the first lens L31 The thickness L1T on the optical axis is equal to 1.41mm, the total thickness of each lens ALT is equal to 2.96mm, the focal length of the first lens L31 is 2.48mm, and the fifth lens The focal length of L35 is 17.17 mm, the focal length of the second lens L32 is -3.07 mm, the focal length of the third lens L33 is 2.20 mm, and the focal length of the fourth lens L34 is -1.83 mm. The convex length G1 of the first lens L31 is equal to 1.324 mm. The maximum outer diameter B of the large diameter part of the lens is equal to 5.9 mm, the maximum outer diameter C of the small diameter part 211b of the lens barrel 211 near the object side is equal to 2.2 mm, and the single side wall thickness of the cover 212 is 0.25 mm.

Table 6 is a table of related parameters of the aspheric surface of each lens of the lens 60 in Fig. 11, where k is the Conic Constant and A~G are the aspheric coefficients.

In this embodiment, the cross section of the first lens L31 is circular, and the optically effective diameter L1D of the object side surface S2 is equal to the maximum outer diameter A of the first part of the small diameter of the first lens L31. According to calculation, A/B=1.436/5.9=0.2434, which satisfies conditional formula (1), and C/B=2.2/5.9=0.3728, which satisfies conditional formula (6). From Table 5 and Table 6, we can see that in lens 60, L1D/L1T=1.436/1.41=1.018, f1/L1T=2.48/1.41=1.76, EFL/L1T=3.175/1.41=2.25, EFL/L1D=3.175/1.436= 2.21, L1D+L1T=1.436+1.41=2.846mm, (EFL+TTL)/L1T=(3.175+4.327)/1.41=5.32, ALT/L1T=2.96/1.41=2.10, G1xf1=1.32x2.48=3.27mm ^2. It can meet the requirements of conditional formulas (7)-(14).

In addition, the optical performance of the lens 60 can also meet the requirements, which can be seen from Figures 12A to 12B. Figure 12A is the field curvature diagram of the lens 60 in Figure 11; Figure 12B is the distortion diagram of the lens 60 in Figure 11; it can be seen from Figure 12A that the field curvature of the lens 60 ranges from -0.05mm to 0.05mm. between. It can be seen from Figure 12B that the distortion of the lens 60 is between 0 and 2.2%. In addition, through experiments, the value of the modulation transfer function of the lens 60 is between 0.17 and 1.0. Obviously, the field curvature and distortion of the lens 60 can be effectively corrected, and the resolution of the lens can also meet the requirements. To obtain better optical performance.

FIG. 13 is a schematic diagram of the lens configuration of the fourth embodiment of the lens according to the present invention. As shown in FIG. 13, the lens 70 includes an aperture ST4, a first lens L41, a fifth lens L45, a second lens L42, a third lens L43, and a fourth lens L44 in order from the object side to the image side along the optical axis OA. , Filter OF4, and imaging surface IMA4.

The first lens L41 has positive refractive power. The first lens L41 is a meniscus lens, the object side surface S2 is a convex surface, and the image side surface S3 is a concave surface. The first lens L41 may be made of glass.

The fifth lens L45 has positive refractive power. The fifth lens L45 is a meniscus lens, the object side surface S10 is concave, and the image side surface S11 is convex. The fifth lens L45 may be made of plastic.

The second lens L42 has negative refractive power. The second lens L42 is a meniscus lens, the object side surface S4 is a convex surface, and the image side surface S5 is a concave surface. The second lens L42 may be made of plastic.

The third lens L43 has positive refractive power. The third lens L43 is a meniscus lens, the object side surface S6 is a concave surface, and the image side surface S7 is a convex surface. The third lens L43 may be made of plastic.

The fourth lens L44 has negative refractive power. The fourth lens L44 is a biconcave lens, the object side surface S8 is a concave surface, and the image side surface S9 is a concave surface and has an inflection point. The fourth lens L44 may be made of plastic.

The object side S12 and the image side S13 of the filter OF4 are both flat surfaces.

It can be understood that the cross-section of the first lens L41 is not limited to a circle, and can also be other shapes such as non-circular, polygonal, polygonal symmetrical to the optical axis, bottle shape or oak barrel shape.

At least one of the first, fifth, second, third, and fourth lenses L41, L45, L42, L43, L44 may have an aspheric surface, and the definition of the concavity z of the aspheric surface is the same as The definition of the concavity z of the aspherical surface of each lens in Table 1 in the first embodiment is the same, and will not be repeated here.

When the lens 70 satisfies at least one of the above conditional expressions (7)-(14) and conditional expression (15): 0.29mm<L1T-L5T-L2T<0.89mm, the outer diameter of the small diameter part of the lens, And the optical effective diameter of the first lens L41 is less than 2.2mm, the projection amount of the first lens L41 from the small diameter part of the lens barrel or the projection amount from the lens barrel is greater than or equal to 0.8mm, and the entire lens 70 can be maintained well Optical performance.

Table 7 is a table of related parameters of each lens of the lens 70 in Figure 13. The effective focal length EFL of the lens 70 is equal to 4.02mm, the aperture value is equal to 2.2, the total lens length is equal to 5.6mm, the field of view is equal to 76.3 degrees, the optical effective diameter L1D of the object side S2 of the first lens L41 is equal to 1.83mm, and the first lens L41 is in The thickness L1T on the optical axis is equal to 1.4mm, the thickness L5T of the fifth lens L45 on the optical axis is equal to 0.465mm, the thickness L2T of the second lens L42 on the optical axis is equal to 0.291mm, and the total thickness of each lens ALT is equal to 3.767mm , The focal length of the first lens L41 is 5.59mm, the focal length of the fifth lens L45 is 3.53mm, the focal length of the second lens L42 is -4.33mm, the focal length of the third lens L43 is 3.08mm, and the focal length of the fourth lens L44 is- 2.02mm. The convex length G1 of the first lens L41 is equal to 1.41 mm. The maximum outer diameter B of the large diameter portion of the lens is equal to 6.6 mm, the maximum outer diameter C of the small diameter portion 211b of the lens barrel 211 near the object side is equal to 2.0 mm, and the single side wall thickness of the cover 212 is 0.09 mm.

Table 8 is a table of related parameters of the aspheric surface of each lens of the lens 70 in Figure 9, where k is the Conic Constant, and A~G are the aspheric coefficients.

In this embodiment, the cross section of the first lens L41 is circular, and the optically effective diameter L1D of the object side surface S2 is equal to the maximum outer diameter A of the first part of the small diameter of the first lens L41. According to the calculation, A/B=1.83/6.6=0.2772, which satisfies conditional formula (1), and C/B=2.0/6.6=0.3030, which satisfies conditional formula (6). It can be seen from Table 7 and Table 8 that in lens 70, L1D/L1T=1.83/1.4=1.307, f1/L1T=5.59/1.4=3.99, EFL/L1T=4.02/1.4=2.87, EFL/L1D=4.02/1.83= 2.20, L1D+L1T=1.83+1.4=3.23mm, (EFL+TTL)/L1T=(4.02+5.6)/1.4=6.87, ALT/L1T=3.767/1.4=2.69, G1xf1=1.41x5.59=7.88mm ^2. L1T-L5T-L2T=1.4-0.465-0.921=0.644mm, which can meet the requirements of conditional formulas (7)-(15).

In addition, the optical performance of the lens 70 can also meet the requirements, which can be seen from FIGS. 14A to 14B. Figure 14A is a field curvature diagram of the lens 70 in Figure 9; Figure 14B is a distortion diagram of the lens 70 in Figure 9; it can be seen from Figure 14A that the field curvature of the lens 70 is between -0.03mm and 0.07mm between. It can be seen from Figure 14B that the distortion of the lens 70 is between 0 and 2.1%. In addition, through experiments, the value of the modulation transfer function of the lens 70 is between 0.29 and 1.0. It is obvious that the field curvature and distortion of the lens 70 can be effectively corrected, and the resolution of the lens can also meet the requirements, thereby obtaining better optical performance.

FIG. 15 is a schematic diagram of the lens configuration and optical path of the fifth embodiment of the lens according to the present invention. As shown in FIG. 15, the lens 80 includes an aperture ST5, a first lens L51, a fifth lens L55, a second lens L52, a third lens L53, and a fourth lens L54 in order from the object side to the image side along the optical axis OA. , Filter OF5, and imaging surface IMA5.

The first lens L51 has positive refractive power. The first lens L51 is a meniscus lens, the object side surface S2 is a convex surface, and the image side surface S3 is a concave surface. The first lens L51 may be made of glass.

The fifth lens L55 has positive refractive power. The fifth lens L55 is a meniscus lens, The object side surface S10 is a concave surface, and the image side surface S11 is a convex surface. The fifth lens L55 may be made of plastic.

The second lens L52 has negative refractive power. The second lens L52 is a biconcave lens, the object side surface S4 is a concave surface, and the image side surface S5 is a concave surface. The second lens L52 can be made of plastic.

The third lens L53 has positive refractive power. The third lens L53 is a biconvex lens, the object side S6 is convex, and the image side S7 is convex. The third lens L53 may be made of plastic.

The fourth lens L54 has negative refractive power. The fourth lens L54 is a biconcave lens, the object side surface S8 is a concave surface, and the image side surface S9 is a concave surface and has an inflection point. The fourth lens L54 may be made of plastic.

The object side S12 and the image side S13 of the filter OF5 are both flat surfaces.

It can be understood that the cross-section of the first lens L51 is not limited to a circle, and may also be other shapes such as non-circular, polygonal, polygonal symmetrical to the optical axis, bottle shape or oak barrel shape.

At least one of the first, fifth, second, third, and fourth lenses L51, L55, L52, L53, L54 may have an aspheric surface, and the definition of the concavity z of the aspheric surface is the same as in the first embodiment The definition of the concavity z of the aspherical surface of each lens in Table 1 is the same, and will not be repeated here.

When the lens 80 satisfies at least one of the above conditional expressions (7)-(14) and conditional expression (15): 0.29mm<L1T-L5T-L2T<0.89mm, the outer diameter, And the optical effective diameter of the first lens L51 is less than 2.2mm, the projection amount of the first lens L51 from the small diameter portion of the lens barrel or the projection amount from the lens barrel is greater than or equal to 0.8mm, and the entire lens 80 can be maintained well Optical performance.

Table 9 is a table of related parameters of each lens of the lens 80 in Figure 15. Lens 80 The effective focal length EFL is equal to 3.983mm, the aperture value is equal to 2.25, the total lens length is equal to 5mm, the field of view is equal to 77 degrees, and the optical effective diameter L1D of the object side S2 of the first lens L51 is equal to 1.784mm. The thickness of the first lens L51 on the optical axis L1T is equal to 1.385mm, the thickness of the fifth lens L55 on the optical axis L5T is equal to 0.427mm, the thickness of the second lens L52 on the optical axis L2T is equal to 0.22mm, the thickness of each lens The total ALT is equal to 3.388mm, the focal length of the first lens L51 is 4.01mm, the focal length of the fifth lens L55 is 6.71mm, the focal length of the second lens L52 is -3.64mm, the focal length of the third lens L53 is 2.69mm, the fourth lens The focal length of L54 is -2.06mm. The convex length G1 of the first lens L51 is equal to 1.48 mm. The maximum outer diameter B of the large diameter part of the lens is equal to 6.6 mm, the maximum outer diameter C of the small diameter part 211b of the lens barrel 211 near the object side is equal to 2.0 mm, and the single side wall thickness of the cover 212 is 0.1 mm.

Table 10 is a table of related parameters of the aspheric surface of each lens of the lens 80 in Figure 15, where k is the Conic Constant, and A~G are the aspheric coefficients.

In this embodiment, the cross section of the first lens L51 is circular, and the optically effective diameter L1D of the object side surface S2 is equal to the maximum outer diameter A of the first part of the small diameter of the first lens L51. According to the calculation, A/B=1.784/6.6=0.2703, which satisfies conditional formula (1), and C/B=2.0/6.6=0.3030, which satisfies conditional formula (6). From Table 9 and Table 10, we can see that in lens 80, L1D/L1T=1.784/1.385=1.288, f1/L1T=4.01/1.385=2.90, EFL/L1T=3.983/1.385=2.88, EFL/L1D=3.983/1.784= 2.23, L1D+L1T=1.784+1.385=3.169mm, (EFL+TTL)/L1T=(3.983+5)/1.385=6.49, ALT/L1T=3.388/1.385=2.45, G1xf1=1.48x4.01=5.93mm ^2. L1T-L5T-L2T=1.385-0.427-0.22=0.738mm, which can meet the requirements of conditional formulas (7)-(15). In addition, the optical performance of the lens 80 can also meet the requirements, which can be seen from Figures 16A to 16B. Figure 16A is the field curvature diagram of the lens 80 in Figure 15; Figure 16B is the distortion diagram of the lens 80 in Figure 15; it can be seen from Figure 16A that the field curvature of the lens 80 is between -0.04mm and 0.07mm between. It can be seen from Figure 16B that the distortion of the lens 80 is between 0 and 2.1%. In addition, through experiments, the value of the modulation transfer function of the lens 80 is between 0.18 and 1.0. It is obvious that the field curvature and distortion of the lens 80 can be effectively corrected, and the resolution of the lens can also meet the requirements, thereby obtaining better optical performance.

Compared with the prior art, the lens of the present invention can further reduce the thickness, while having a wider viewing angle and good optical performance.

FIG. 17 is a schematic diagram of the lens configuration and optical path of the sixth embodiment of the lens according to the present invention. As shown in FIG. 17, the lens 90 includes an aperture ST6, a first lens L61, a fifth lens L65, a second lens L62, a third lens L63, and a fourth lens L64 in order from the object side to the image side along the optical axis OA. , Filter OF6, and imaging surface IMA6.

The first lens L61 has positive refractive power. The first lens L61 is a meniscus lens, the object side surface S2 is a convex surface, and the image side surface S3 is a concave surface. The first lens L61 may be made of glass.

The fifth lens L65 has positive refractive power. The fifth lens L65 is a biconvex lens, the object side surface S10 is a convex surface, and the image side surface S11 is a convex surface. The fifth lens L65 may be made of plastic.

The second lens L62 has negative refractive power. The second lens L62 is a biconcave lens, the object side surface S4 is a concave surface, and the image side surface S5 is a concave surface. The second lens L62 may be made of plastic.

The third lens L63 has positive refractive power. The third lens L63 is a biconvex lens, the object side surface S6 is a convex surface, and the image side surface S7 is a convex surface. The third lens L63 may be made of plastic.

The fourth lens L64 has negative refractive power. The fourth lens L64 is a biconcave lens, The object side surface S8 is a concave surface, and the image side surface S9 is a concave surface and has an inflection point. The fourth lens L64 may be made of plastic.

The object side S12 and the image side S13 of the filter OF6 are both flat surfaces.

It can be understood that the cross-section of the first lens L61 is not limited to a circular shape, and may also be other shapes such as non-circular, polygonal, polygonal symmetrical to the optical axis, bottle shape or oak barrel shape.

At least one of the first, fifth, second, third, and fourth lenses L61, L65, L62, L63, L64 may have an aspheric surface, and the definition of the concavity z of the aspheric surface is the same as that in the first embodiment The definition of the concavity z of the aspherical surface of each lens in Table 1 is the same, and will not be repeated here.

When the lens 90 satisfies at least one of the above conditional expressions (7)-(14) and conditional expression (15): 0.29mm<L1T-L5T-L2T<0.89mm, the outer diameter of the small diameter part of the lens, And the optical effective diameter of the first lens L61 is less than 2.2mm, the projection amount of the first lens L61 from the small diameter portion of the lens barrel or the projection amount from the lens barrel is greater than or equal to 0.8mm, and the entire lens 90 can be maintained well Optical performance.

Table 11 is a table of related parameters of each lens of the lens 90 in Figure 17. The effective focal length EFL of the lens 90 is equal to 3.45 mm, the aperture value is equal to 2.25, the total lens length TTL is equal to 4.546 mm, the field of view is equal to 78 degrees, and the optical effective diameter L1D of the object side S2 of the first lens L61 is equal to 1.55 mm. The thickness of the first lens L61 on the optical axis L1T is equal to 1.065mm, the thickness of the fifth lens L65 on the optical axis L5T is equal to 0.428mm, the thickness of the second lens L62 on the optical axis L2T is equal to 0.338mm, the thickness of each lens The sum ALT is equal to 2.90mm, the focal length of the first lens L61 is 4.09mm, the focal length of the fifth lens L65 is 4.48mm, and the focal length of the second lens L62 is -2.77mm, the focal length of the third lens L63 is 1.83mm, and the focal length of the fourth lens L64 is -1.66mm. The convex length G1 of the first lens L61 is equal to 1.105 mm. The maximum outer diameter B of the major diameter part of the lens is equal to 5.9 mm.

Table 12 is a table of related parameters of the aspheric surface of each lens of the lens 90 in Figure 17, where k is the Conic Constant, and A~G are the aspheric coefficients.

In this embodiment, the cross section of the first lens L61 is circular, and the optically effective diameter L1D of the object side surface S2 is equal to the maximum outer diameter A of the first part of the small diameter of the first lens L61. According to the calculation, A/B=1.55/5.9=0.2627, which satisfies the conditional formula (1). From Table 11 and Table 12, it can be seen that in lens 90, L1D/L1T=1.55/1.065=1.46, f1/L1T=4.09/1.065=3.84, EFL/L1T=3.45/1.065=3.24, EFL/L1D=3.45/ 1.55=2.23, L1D+L1T=1.55+1.065=2.615mm, (EFL+TTL)/L1T=(3.45+4.546)/1.065=7.51, ALT/L1T=2.90/1.065=2.72, G1xf1=1.105x4.09= 4.52mm ² , L1T-L5T-L2T=1.065-0.428-0.338=0.299mm, which can meet the requirements of conditional formulas (7)-(15). In addition, the optical performance of the lens 90 can also meet the requirements, which can be seen from Figures 18A to 18B. Figure 18A is the field curvature diagram of the lens 90 in Figure 17; Figure 18B is the distortion diagram of the lens 90 in Figure 17; it can be seen from Figure 18A that the field curvature of the lens 90 ranges from -0.035mm to 0.05mm between. It can be seen from Figure 18B that the distortion of the lens 90 is between 0 and 2.2%. In addition, through experiments, the value of the modulation transfer function of the lens 90 is between 0.40 and 1.0. Obviously, the field curvature and distortion of the lens 90 can be effectively corrected, and the lens resolution (Resolution) can also meet the requirements, thereby obtaining better optical performance.

Figure 19 shows the lens configuration and light of the seventh embodiment of the lens according to the present invention. Road schematic diagram. As shown in FIG. 19, the lens 100 includes an aperture ST7, a first lens L71, a fifth lens L75, a second lens L72, a third lens L73, and a fourth lens L74 in order from the object side to the image side along the optical axis OA. , Filter OF7, and imaging surface IMA7.

The first lens L71 has positive refractive power. The first lens L71 is a meniscus lens, the object side surface S2 is a convex surface, and the image side surface S3 is a concave surface. The first lens L71 may be made of glass.

The fifth lens L75 has positive refractive power. The fifth lens L75 is a biconvex lens, the object side surface S10 is a convex surface, and the image side surface S11 is a convex surface. The fifth lens L75 may be made of plastic.

The second lens L72 has negative refractive power. The second lens L72 is a biconcave lens, the object side S4 is a concave surface, and the image side S5 is a concave surface. The second lens L72 may be made of plastic.

The third lens L73 has positive refractive power. The third lens L73 is a biconvex lens, the object side surface S6 is a convex surface, and the image side surface S7 is a convex surface. The third lens L73 may be made of plastic.

The fourth lens L74 has negative refractive power. The fourth lens L74 is a biconcave lens, the object side surface S8 is a concave surface, and the image side surface S9 is a concave surface and has an inflection point. The fourth lens L74 may be made of plastic.

The object side S12 and the image side S13 of the filter OF7 are both flat surfaces.

It can be understood that the cross-section of the first lens L71 is not limited to a circular shape, and may also have other shapes such as non-circular, polygonal, polygonal symmetrical to the optical axis, bottle shape or oak barrel shape.

At least one of the first, fifth, second, third, and fourth lenses L71, L75, L72, L73, and L74 may have an aspheric surface. The definition of the concavity z of the aspheric surface is the same as in the first embodiment The definition of the concavity z of the aspherical surface of each lens in Table 1 is the same, and will not be repeated here.

When the lens 100 satisfies at least one of the above conditional expressions (7)-(14) and conditional expression (15): 0.29mm<L1T-L5T-L2T<0.89mm, the outer diameter of the small diameter part of the lens, And the optical effective diameter of the first lens L71 is less than 2.2mm, the projection amount of the first lens L71 from the small diameter portion of the lens barrel, or the projection amount from the lens barrel is greater than or equal to 0.8mm, and the entire lens 100 can be maintained well Optical performance.

Table 13 is a table of related parameters of each lens of the lens 100 in Figure 19. The effective focal length EFL of the lens 100 is equal to 3.45 mm, the aperture value is equal to 2.25, the total lens length TTL is equal to 4.57 mm, the field of view is equal to 78.38 degrees, and the optical effective diameter L1D of the object side S2 of the first lens L71 is equal to 1.55 mm. The thickness of the first lens L71 on the optical axis L1T is equal to 1.275mm, the thickness of the fifth lens L75 on the optical axis L5T is equal to 0.430mm, the thickness of the second lens L72 on the optical axis L2T is equal to 0.258mm, the thickness of each lens The total ALT is equal to 3.05mm, the focal length of the first lens L71 is 4.343mm, the focal length of the fifth lens L75 is 4.434mm, the focal length of the second lens L72 is -3.182mm, the focal length of the third lens L73 is 2.155mm, the fourth lens The focal length of L74 is -1.829mm. The convex length G1 of the first lens L71 is equal to 1.3428 mm. The maximum outer diameter B of the major diameter part of the lens is equal to 5.9 mm.

Table 14 is a table of related parameters of the aspheric surface of each lens of the lens 100 in Figure 19, where k is the Conic Constant and A~G are the aspheric coefficients.

In this embodiment, the cross-section of the first lens L71 is circular, and the optically effective diameter L1D of the object side surface S2 is equal to the maximum outer diameter A of the small-diameter first part of the first lens L71. According to the calculation, A/B=1.55/5.9=0.2627, which satisfies the conditional formula (1). From Table 13 and Table 14, we can see that in lens 100, L1D/L1T=1.55/1.275=1.22, f1/L1T=4.343/1.275=3.41, EFL/L1T=3.45/1.275=2.71, EFL/L1D=3.45/ 1.55=2.23, L1D+L1T=1.55+1.274=2.825mm, (EFL+TTL)/L1T=(3.45+4.57)/1.274=6.30, ALT/L1T=3.05/1.274=2.39mm, G1xf1=1.3428x4.343 =5.83mm ² , L1T-L5T-L2T=1.275-0.430-0.258=0.587mm, which can meet the requirements of conditional formulas (7)-(15). In addition, the optical performance of the lens 100 can also meet the requirements, which can be seen from Figures 20A to 20B. Figure 20A is the field curvature diagram of the lens 100 in Figure 19; Figure 20B is the distortion diagram of the lens 100 in Figure 19; it can be seen from Figure 20A that the field curvature of the lens 100 is between -0.05mm and 0.04mm between. It can be seen from Fig. 20B that the distortion of the lens 100 is between 0 and 2.5%. In addition, through experiments, the value of the modulation transfer function of the lens 100 is between 0.45 and 1.0. It is obvious that the field curvature and distortion of the lens 100 can be effectively corrected, and the resolution of the lens can also meet the requirements, thereby obtaining better optical performance.

Compared with the prior art, the lens of the present invention can further reduce the thickness, while having a wider viewing angle and good optical performance.

FIG. 21 is a schematic diagram of the lens configuration and optical path of the eighth embodiment of the lens according to the present invention. As shown in FIG. 21, the lens 110 includes an aperture ST8, a first lens L81, a fifth lens L85, a second lens L82, a third lens L83, and a fourth lens L84 in order from the object side to the image side along the optical axis OA. , Filter OF8, and imaging surface IMA8.

The first lens L81 has positive refractive power. The first lens L81 is a meniscus lens, the object side surface S2 is a convex surface, and the image side surface S3 is a concave surface. The first lens L81 may be made of glass.

The fifth lens L85 has positive refractive power. The fifth lens L85 is a meniscus lens, the object side surface S10 is concave, and the image side surface S11 is convex. The fifth lens L85 may be made of plastic.

The second lens L82 has negative refractive power. The second lens L82 is a meniscus lens, The object side surface S4 is a concave surface, and the image side surface S5 is a convex surface. The second lens L82 may be made of plastic.

The third lens L83 has negative refractive power. The third lens L83 is a meniscus lens, the object side S6 is convex, and the image side S7 is concave. The third lens L83 may be made of plastic.

The fourth lens L84 has negative refractive power. The fourth lens L84 is a meniscus lens, the object side surface S8 is a convex surface, and the image side surface S9 is a concave surface. The fourth lens L84 may be made of plastic.

The object side S12 and the image side S13 of the filter OF8 are both flat surfaces.

It can be understood that the cross-section of the first lens L81 is not limited to a circular shape, and may also have other shapes such as a non-circular shape, a polygonal shape, a polygonal shape symmetrical to the optical axis, a bottle shape, or an oak barrel shape.

At least one of the first, fifth, second, third, and fourth lenses L81, L85, L82, L83, L84 may have an aspheric surface, and the aspheric surface concavity z is obtained by the following formula:

z=ch ² /{1+[1-(k+1)c ² h ² ] ^1/2 }+Ah ⁴ +Bh ⁶ +Ch ⁸ +Dh ¹⁰ +Eh ¹² +Fh ¹⁴ +Gh ¹⁶ +Hh ¹⁸ + Ih ²⁰

Among them, c is the curvature; h is the vertical distance from any point on the lens surface to the optical axis; k is the conic coefficient; A ~ I are the aspheric coefficients.

When the lens 110 satisfies at least one of the above conditional expressions (7)-(14) and conditional expression (15): 0.29mm<L1T-L5T-L2T<0.89mm, the outer diameter of the small diameter part of the lens, And the optical effective diameter of the first lens L81 is less than 2mm, the projection amount of the first lens L81 from the small diameter portion of the lens barrel, or the projection amount from the lens barrel is greater than or equal to 0.8mm, and the entire lens 110 can maintain good Optical performance.

Table 15 is a table of related parameters of each lens of the lens 110. Effectiveness of lens 110 The focal length EFL is equal to 3.727 mm, the aperture value is equal to 2.48, the total lens length TTL is equal to 4.36 mm, the field of view is equal to 80.9 degrees, and the optical effective diameter L1D of the object side S2 of the first lens L81 is equal to 1.582 mm. The thickness of the first lens L81 on the optical axis L1T is equal to 0.981mm, the thickness of the fifth lens L85 on the optical axis L5T is equal to 0.398mm, the thickness of the second lens L82 on the optical axis L2T is equal to 0.213mm, the thickness of each lens The total ALT is equal to 2.642mm, the focal length of the first lens L81 is 3.628mm, the focal length of the fifth lens L85 is 5.711mm, the focal length of the second lens L82 is -7.409mm, the focal length of the third lens L83 is -747.533mm, the fourth The focal length of the lens L84 is -5.25mm. The convex length G1 of the first lens L81 is equal to 1.089 mm. The maximum outer diameter B of the major diameter part of the lens is equal to 6.764 mm.

Table 16 is a table of related parameters of the aspheric surface of each lens of the lens 110, where k is the Conic Constant, and A~I are the aspheric coefficients.

Table 16

In this embodiment, the cross-section of the first lens L81 is circular, and the optically effective diameter L1D of the object side surface S2 is equal to the maximum outer diameter A of the small-diameter first part of the first lens L81. According to the calculation, A/B=1.582/6.764=0.234, which satisfies the conditional formula (1). From Table 15 and Table 16, we can see that in lens 110, L1D/L1T=1.582/0.981=1.61, f1/L1T=3.628/0.981=3.70, EFL/L1T=3.727/0.981=3.80, EFL/L1D=3.727/ 1.582=2.36, L1D+L1T=1.582+0.981=2.563mm, (EFL+TTL)/L1T=(3.727+4.36)/0.981=8.24, ALT/L1T=2.642/0.981=2.69mm, G1xf1=1.089x3.628 =3.95mm ² , L1T-L5T-L2T=0.981-0.398-0.213=0.37mm, which can meet the requirements of conditional formulas (7)-(15). In addition, the curvature of field (illustration omitted) and distortion (illustration omitted) of the lens 110 can also be effectively corrected, and the resolution of the lens can also meet the requirements, thereby obtaining better optical performance.

Compared with the prior art, the lens of the present invention can further reduce the thickness, while having a wider viewing angle and good optical performance.

FIG. 22 is a schematic diagram of the lens configuration and optical path of the ninth embodiment of the lens according to the present invention. As shown in FIG. 22, the lens 120 includes an aperture ST9, a first lens L91, a fifth lens L95, a second lens L92, a third lens L93, and a fourth lens L94 in order from the object side to the image side along the optical axis OA. , Filter OF9, and imaging surface IMA9.

The first lens L91 has positive refractive power. The first lens L91 is a meniscus lens, the object side surface S2 is a convex surface, and the image side surface S3 is a concave surface. The first lens L91 may be made of glass.

The fifth lens L95 has positive refractive power. The fifth lens L95 is a meniscus lens, the object side surface S10 is concave, and the image side surface S11 is convex. The fifth lens L95 may be made of plastic.

The second lens L92 has negative refractive power. The second lens L92 is a meniscus lens, the object side surface S4 is a concave surface, and the image side surface S5 is a convex surface. The second lens L92 can be made of plastic.

The third lens L93 has positive refractive power. The third lens L93 is a biconvex lens, the object side S6 is convex, and the image side S7 is convex. The third lens L93 may be made of plastic.

The fourth lens L94 has negative refractive power. The fourth lens L94 is a meniscus lens, the object side surface S8 is a convex surface, and the image side surface S9 is a concave surface. The fourth lens L94 may be made of plastic.

The object side S12 and the image side S13 of the filter OF9 are both flat surfaces.

It can be understood that the cross-section of the first lens L91 is not limited to a circular shape, and may also have other shapes such as non-circular shapes.

At least one of the first, fifth, second, third, and fourth lenses L91, L95, L92, L93, and L94 may have an aspheric surface. The definition of the concavity z of the aspheric surface is the same as in the eighth embodiment The definition of the aspheric surface concavity z of each lens in Table 15 is the same, here Do not repeat them.

When the lens 120 satisfies at least one of the above conditional expressions (7)-(14) and conditional expression (15): 0.29mm<L1T-L5T-L2T<0.89mm, the outer diameter of the small diameter part of the lens, And the optical effective diameter of the first lens L91 is less than 2mm, the projection amount of the first lens L91 from the small diameter portion of the lens barrel, or the projection amount from the lens barrel is greater than or equal to 0.8mm, and the entire lens 120 can maintain good Optical performance.

Table 17 is a table of related parameters of each lens of the lens 120. The effective focal length EFL of the lens 120 is equal to 3.806 mm, the aperture value is equal to 2.48, the total lens length TTL is equal to 4.368 mm, the field of view is equal to 80.1 degrees, and the optical effective diameter L1D of the object side S2 of the first lens L91 is equal to 1.54 mm. The thickness L1T of the first lens L91 on the optical axis is equal to 1.135mm, the thickness L5T of the fifth lens L95 on the optical axis is equal to 0.38mm, the thickness L2T of the second lens L92 on the optical axis is equal to 0.21mm, the thickness of each lens The sum ALT is equal to 2.579mm, the focal length of the first lens L91 is 3.709mm, the focal length of the fifth lens L95 is 5.548mm, the focal length of the second lens L92 is -11.072mm, the focal length of the third lens L93 is 116.946mm, the fourth lens The focal length of L94 is -3.667mm. The convex length G1 of the first lens L91 is equal to 1.215 mm. The maximum outer diameter B of the major diameter part of the lens is equal to 6.932 mm.

Table 18 is a table of related parameters of the aspheric surface of each lens of the lens 120, where k is the Conic Constant, and A~I are the aspheric coefficients.

In this embodiment, the cross section of the first lens L91 is circular, and the optical effective diameter L1D of the object side surface S2 is equal to the maximum outer diameter A of the first part of the small diameter of the first lens L91. According to the calculation, A/B=1.54/6.932=0.222, which satisfies the conditional formula (1). From Table 17 and Table 18, in the lens 120, L1D/L1T=1.54/1.135=1.36, f1/L1T=3.709/1.135=3.27, EFL/L1T=3.806/1.135=3.35, EFL/L1D=3.806/ 1.54=2.47, L1D+L1T=1.54+1.135=2.675mm, (EFL+TTL)/L1T=(3.806+4.368)/1.135=7.20, ALT/L1T=2.579/1.135=2.27mm, G1xf1=1.215x3.709 =4.51mm ² , L1T-L5T-L2T=1.135-0.38-0.21=0.545mm, which can meet the requirements of conditional formulas (7)-(15). In addition, the curvature of field (illustration omitted) and distortion (illustration omitted) of the lens 120 can also be effectively corrected, and the resolution of the lens can also meet the requirements, thereby obtaining better optical performance.

In the tenth embodiment of the lens of the present invention (the lens configuration and optical path diagrams are omitted), the lens 130 includes an aperture ST10, a first lens L101, a fifth lens L105, and a second lens in order from the object side to the image side along the optical axis OA. Lens L102, third lens L103, fourth lens L104, filter OF10, and imaging surface IMA10.

The first lens L101 has positive refractive power. The first lens L101 is a meniscus lens, the object side surface S2 is a convex surface, and the image side surface S3 is a concave surface. The first lens L101 may be made of glass.

The fifth lens L105 has positive refractive power. The fifth lens L105 is a meniscus lens, the object side surface S10 is concave, and the image side surface S11 is convex. The fifth lens L105 may be made of plastic.

The second lens L102 has negative refractive power. The second lens L102 is a meniscus lens, the object side surface S4 is a concave surface, and the image side surface S5 is a convex surface. The second lens L102 can be made of plastic.

The third lens L103 has positive refractive power. The third lens L103 is a biconvex lens, the object side S6 is convex, and the image side S7 is convex. The third lens L103 may be made of plastic.

The fourth lens L104 has negative refractive power. The fourth lens L104 is a meniscus lens, the object side surface S8 is a convex surface, and the image side surface S9 is a concave surface. The fourth lens L104 can be made of plastic.

The object side S12 and the image side S13 of the filter OF10 are both flat surfaces.

It can be understood that the cross section of the first lens L101 is not limited to a circular shape, and may also have other shapes such as non-circular shapes.

At least one of the first, fifth, second, third, and fourth lenses L101, L105, L102, L103, and L104 may have an aspheric surface, and the definition of the concavity z of the aspheric surface is the same as in the eighth embodiment The definition of the concavity z of the aspheric surface of each lens in Table 15 is the same, and it will not be repeated here.

When the lens 130 satisfies at least one of the above conditional expressions (7)-(14) and conditional expression (15): 0.29mm<L1T-L5T-L2T<0.89mm, the outer diameter of the small diameter part of the lens, And the optical effective diameter of the first lens L101 is less than 2mm, the projection amount of the first lens L101 from the small diameter portion of the lens barrel, or the projection amount from the lens barrel is greater than or equal to 0.8mm, and the entire lens 130 can maintain good Optical performance.

Table 19 is a table of related parameters of each lens of the lens 130. The effective focal length EFL of the lens 130 is equal to 3.614 mm, the aperture value is equal to 2.45, the total lens length TTL is equal to 4.371 mm, the field of view is equal to 81 degrees, and the optical effective diameter L1D of the object side S2 of the first lens L101 is equal to 1.48 mm. The thickness of the first lens L101 on the optical axis L1T is equal to 1.135mm, the thickness of the fifth lens L105 on the optical axis L5T is equal to 0.336mm, the thickness of the second lens L102 on the optical axis L2T is equal to 0.201mm, the thickness of each lens The total ALT is equal to 2.656mm, the focal length of the first lens L101 is 3.555mm, the focal length of the fifth lens L105 is 5.932mm, the focal length of the second lens L102 is -9.11mm, the focal length of the third lens L103 is 38.529mm, the fourth lens The focal length of L104 is -4.164mm. The convex length G1 of the first lens L101 is equal to 1.197 mm. The maximum outer diameter B of the major diameter part of the lens is equal to 6.764 mm.

Table 20 is a table of related parameters of the aspheric surface of each lens of the lens 130, where k is the Conic Constant, and A~I are the aspheric coefficients.

In this embodiment, the cross section of the first lens L101 is circular, and the optically effective diameter L1D of the object side surface S2 is equal to the maximum outer diameter A of the first part of the small diameter of the first lens L101. According to calculation, A/B=1.48/6.764=0.219, which satisfies conditional formula (1). From Table 19 and Table 20, it can be seen that in lens 130, L1D/L1T=1.48/1.135=1.30, f1/L1T=3.555/1.135=3.13, EFL/L1T=3.614/1.135=3.18, EFL/L1D=3.614/ 1.48=2.44, L1D+L1T=1.48+1.135=2.615mm, (EFL+TTL)/L1T=(3.614+4.371)/1.135=7.04, ALT/L1T=2.656/1.135=2.34mm, G1xf1=1.197x3.555 =4.26mm ² , L1T-L5T-L2T=1.135-0.336-0.201=0.598mm, which can meet the requirements of conditional formulas (7)-(15). In addition, the curvature of field (illustration omitted) and distortion (illustration omitted) of the lens 130 can also be effectively corrected, and the resolution of the lens can also meet the requirements, thereby obtaining better optical performance.

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 the scope of the attached patent application.

60‧‧‧Lens

ST3‧‧‧Aperture

L31‧‧‧First lens

L35‧‧‧Fifth lens

L32‧‧‧Second lens

L33‧‧‧Third lens

L34‧‧‧Fourth lens

OF3‧‧‧Filter

IMA3‧‧‧imaging surface

OA‧‧‧Optical axis

S1‧‧‧Aperture surface

S2‧‧‧Object side of the first lens

S3‧‧‧The first lens image side

S10‧‧‧Fifth lens object side

S11‧‧‧Fifth lens image side

S4‧‧‧Object side of second lens

S5‧‧‧Second lens image side

S6‧‧‧Object side of third lens

S7‧‧‧Third lens image side

S8‧‧‧Fourth lens object side

S9‧‧‧Fourth lens image side

S12‧‧‧The side of the filter object

S13‧‧‧Filter image side

S14‧‧‧Image surface

Claims (10)

A lens comprising: a mirror chamber, the mirror chamber including a lens barrel; and a first lens, a second lens, and a lens that are sequentially fixed in the mirror chamber from an object side to an image side along an optical axis A third lens and a fourth lens, wherein the first lens is the lens closest to the object side and includes an object side surface and an image side surface, the object side surface protrudes outward along the optical axis and along the optical axis The cross section of is higher in the middle part than on both sides, and the middle part bulges toward the object side and forms a column, including a first part with a small diameter near the object side and a second part with a large diameter near the image side , A step difference is formed between the first part and the second part; wherein the lens includes a small diameter part of the lens close to the object side and a large diameter part of the lens close to the image side, the small diameter part and the large diameter part of the lens The diameter of the lens is different, and the lens satisfies the following condition: 0<A/B<0.3; where A is the maximum outer diameter of the small diameter first part of the first lens, and B is the maximum outer diameter of the large diameter part of the lens. The lens described in item 1 of the scope of patent application, wherein the lens barrel includes a large-diameter part close to the image side and a small-diameter part close to the object side, and a stepped surface is formed between the two. The part is formed by the small diameter part of the lens barrel, the large diameter part of the lens is formed by the large diameter part of the lens barrel; the peripheral part of the first lens is fixed in the large diameter part of the lens barrel, and the optical The effective diameter portion is located in the small diameter portion of the lens barrel; the lens further includes a cover connected to the object side end of the lens barrel, the cover has an opening, and the cover is formed in front of the object side of the first lens An aperture structure. The lens described in item 2 of the scope of application, wherein the object side of the first lens is flush with or slightly lower than the object side of the cover, the lens barrel and the cover are integrally formed, and the cover The opening is circular or polygonal or non-circular or polygonal or bottle-shaped or oak barrel-shaped symmetrical with the optical axis. The lens described in item 1 of the scope of patent application, wherein: the lens barrel includes an end surface facing the object side, a first lens fixing hole is provided on the end surface, the peripheral portion is fixed in the lens barrel, and the optical effective diameter portion The part of the lens protrudes from the first lens fixing hole; and the small diameter part of the lens is formed by the part of the optical effective diameter part of the first lens, the large diameter part of the lens is formed by the lens barrel, and the The edge of the object side forms an aperture structure of the lens. The lens described in any one of items 1 to 4 in the scope of the patent application, wherein the first lens includes an optical effective diameter part and a peripheral part for supporting and fixing; and the lens meets the following conditions: 0.19

A/B

0.28; where A is the maximum outer diameter of the small-diameter first part of the first lens, and B is the maximum outer diameter of the large-diameter part of the lens. A lens comprising: a mirror chamber including a lens barrel; and the following lenses arranged in order from an object side to an image side along an optical axis: a first lens having positive refractive power and including an object Side and an image side; a second lens with negative refractive power; A third lens with refractive power; a fourth lens with negative refractive power; the lens meets the following conditions: 0.8<L1D/L1T<1.7; where L1D is an optical effective diameter of the object side of the first lens, and L1T is The distance from the object side of the first lens to the image side on the optical axis; the lens includes a lens small diameter portion close to the object side and a lens large diameter portion close to the image side, the lens small diameter The diameter of the lens part and the large diameter part of the lens are different; the first lens, the second lens, the third lens, and the fourth lens are sequentially fixed in the mirror chamber along the optical axis from the object side to the image side . Such as the lens described in item 1 or item 6 of the scope of patent application, wherein the shape of the small diameter portion of the lens is circular or polygonal or non-circular or polygonal or bottle-shaped or oak barrel-shaped symmetrical to the optical axis, the lens The shape of the large-diameter part is circular or polygonal or non-circular or polygonal or bottle-shaped or oak barrel-shaped symmetrical to the optical axis. The lens meets at least one of the following conditions: 0<A

2.2mm; h

0.8mm; 0.8>h/H

0.22; 0<S1/S2<0.25; where A is the maximum outer diameter of the first part of the small diameter of the first lens, h is the thickness of the small diameter part of the lens on the optical axis, and H is the entire lens A thickness on the optical axis, S1 is a cross-sectional area of the small diameter part of the lens, and S2 is a cross-sectional area of the large diameter part of the lens. The lens described in item 1 or item 6 of the scope of patent application, wherein the object side surface of the first lens is convex, f1 is a focal length of the first lens, and G1 is the center of the object side surface of the first lens The distance from the apex to the edge of the effective diameter of the image side of the first lens on the optical axis, L1D is an optical effective diameter of the object side of the first lens, and L1T is the distance from the object side of the first lens The distance between the image side and the optical axis, EFL is an effective focal length of the lens, TTL is the distance from the object side of the first lens to an imaging surface on the optical axis, and ALT is the distance between each lens A sum of thickness on the optical axis, C is the maximum outer diameter of the small diameter part of the lens, B is the maximum outer diameter of the large diameter part of the lens; the lens satisfies at least one of the following conditions: 0<f1/L1T <5; 2.5mm ² <G1xf1<8mm ² ; 1<EFL/L1T<4;1.9<EFL/L1D<2.6;2mm<(L1D+L1T)<5mm;3<(EFL+TTL)/L1T<9;1.5<ALT/L1T<3.5;0<C/B

0.38. The lens described in item 1 or item 6 of the scope of patent application further includes a fifth lens with positive refractive power, and the fifth lens is located between the first lens and the second lens; The object side surface is convex, the second lens includes an object side surface and an image side surface, the fifth lens includes an object side surface and an image side surface, the image side surface of the fifth lens is convex, and L1T is the first lens The distance from the side of the object to the side of the image on the optical axis, L2T is the second A distance from the object side of the lens to the image side on the optical axis, L5T is a distance from the object side of the fifth lens to the image side on the optical axis; the lens satisfies the following conditions: 0.29mm< L1T-L5T-L2T<0.89mm. For the lens described in item 1 or item 6 of the scope of patent application, wherein the object side surface of the first lens is convex, the third lens includes an object side surface and an image side surface, and the fourth lens includes an object side surface and An image side surface, the third lens has a positive refractive power, the image side surface of the third lens is a convex surface, and the image side surface of the fourth lens is a concave surface.

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