TWI746031B - Lens assembly - Google Patents

Abstract

A lens assembly includes a first lens, a reflective element, a second lens, a third lens, a fourth lens, and a fifth lens. The first lens is with negative refractive power and includes a concave surface facing a first object side. The reflective element includes a reflective surface. The second lens is with positive refractive power and includes a convex surface facing a second object side. The third lens is with positive refractive power and includes a convex surface facing the second object side. The fourth lens is with negative refractive power. The fifth lens is with positive refractive power and includes a convex surface facing a second image side. The first lens and the reflective element are arranged in order along a first optical axis. The reflective element, the second, third, fourth, and fifth lenses are arranged in order along a second optical axis. The lens assembly satisfies the following condition: 0 < f/L1T < 5; wherein f is an effective focal length of the lens assembly and L1T is a thickness of the first lens along the first optical axis.

Description

Imaging lens (45)

The invention relates to an imaging lens.

Nowadays, the development trend of mobile phone imaging lenses is constantly moving towards high resolution. The number of lenses used in imaging lenses is increasing, making the total length and outer diameter of the imaging lens longer and larger, and the volume of the imaging lens Compared with the ratio of the internal volume of the mobile phone, it has been unable to meet the needs of thin and light mobile phones. Therefore, another new architecture imaging lens is needed to meet the needs of high resolution and miniaturization at the same time.

In view of this, the main purpose of the present invention is to provide an imaging lens, which has a shorter overall lens length, a smaller lens outer diameter, a higher resolution, and is easy to process, but still has good optical performance.

The imaging lens of the present invention includes a first lens, a reflective element, a second lens, a third lens, a fourth lens, and a fifth lens. The first lens has negative refractive power and includes a concave surface facing a first object side. The reflective element includes a reflective surface. The second lens has positive refractive power and includes a convex surface facing a second object side. The third lens has positive refractive power and includes a convex surface facing the second object side. The fourth lens has negative refractive power. The fifth lens has positive refractive power and includes a convex surface facing a second image side. The first lens and the reflective element are along a first optical axis from the first object side to a The first image side is arranged in order. The reflective element, the second lens, the third lens, the fourth lens and the fifth lens are arranged in order from the second object side to the second image side along a second optical axis. The first optical axis intersects the second optical axis. The imaging lens satisfies the following conditions: 0<f/L1T<5; where f is an effective focal length of the imaging lens, and L1T is a thickness of the first lens along the first optical axis.

The first lens may further include a flat surface or a concave surface facing the first image side, the fourth lens is a meniscus lens, and the first optical axis and the second optical axis are perpendicular to each other.

The fifth lens may further include another convex surface or a concave surface facing the second object side.

The second lens is a biconvex lens, which may further include another convex surface facing the second image side, the third lens is a meniscus lens, which may further include a concave surface facing the second image side, and the fourth lens includes a concave surface facing the second object The side and a convex surface face the second image side.

The second lens is a meniscus lens which may further include a concave surface facing the second image side, the third lens is a biconvex lens which may further include another convex surface facing the second image side, and the fourth lens includes a convex surface facing the second object side And a concave surface faces the second image side.

The imaging lens meets at least one of the following conditions: 0.1<SD5/TTL<0.6; 4<TTL/SD1<14; 0.5<SD1/L1T<3; Among them, SD1 is the optical effective diameter of the first lens, and SD5 is An optical effective diameter of the fifth lens, TTL is the distance between an object side of the first lens and an imaging surface on the first optical axis and the second optical axis, and L1T is one of the first lens along the first optical axis thickness.

The reflective element may further include an incident surface facing the first object side and an exit surface facing the second image side. The imaging lens satisfies at least one of the following conditions: 0.5<MT/L1T<10; 0<MT/(SD2+SD3 +SD4+SD5)<1.0; where MT is the distance between the incident surface through the reflecting surface and the exit surface on the first optical axis and the second optical axis, and L1T is the thickness of the first lens along the first optical axis In degrees, SD2 is one of the optical effective diameters of the second lens, SD3 is one of the optical effective diameters of the third lens, SD4 is one of the optical effective diameters of the fourth lens, and SD5 is one of the optical effective diameters of the fifth lens.

The imaging lens satisfies at least one of the following conditions: 2mm<L<6mm; 1<TTL/L<5; 0<f/L<2; where L is the object side of the first lens to the reflective surface on the first A distance on the optical axis, TTL is a distance between the object side of the first lens and an imaging surface on the first optical axis and the second optical axis, and f is an effective focal length of the imaging lens.

The imaging lens satisfies the following conditions: -20<R ₁₁ /L1T<0; where R ₁₁ is a curvature radius of an object side surface of the first lens, and L1T is a thickness of the first lens along the first optical axis.

The imaging lens satisfies at least one of the following conditions: 2<ALD/f<8;-12<f ₁ /L1T<0; where ALD is the sum of the optical effective diameters of the lenses of the imaging lens, and f is the total of the imaging lens An effective focal length, f ₁ is an effective focal length of the first lens, and L1T is a thickness of the first lens along the first optical axis.

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

1, 2, 3, 4: imaging lens

CG1, CG2, CG3, CG4: protective glass

ST1, ST2, ST3, ST4: Aperture

L11, L21, L31, L41: the first lens

P1, P2, P3, P4: reflective element

L12, L22, L32, L42: second lens

L13, L23, L33, L43: third lens

L14, L24, L34, L44: fourth lens

L15, L25, L35, L45: fifth lens

OF1, OF2, OF3, OF4: filter

IMA1, IMA2, IMA3, IMA4: imaging surface

OA11, OA21, OA31, OA41: first optical axis

OA12, OA22, OA32, OA42: second optical axis

S11, S21, S31, S41: Protect the side of the glass object

S12, S22, S32, S42: Protect the side of the glass image

S13, S23, S33, S43: aperture surface

S14, S24, S34, S44: the object side of the first lens

S15, S25, S35, S45: the side of the first lens image

S16, S26, S36, S46: incident surface of reflective element

S17, S27, S37, S47: reflective surface of reflective element

S18, S28, S38, S48: exit surface of reflective element

S19, S29, S39, S49: the object side of the second lens

S110, S210, S310, S410: the side of the second lens image

S111, S211, S311, S411: third lens object side

S112, S212, S312, S412: third lens image side

S113, S213, S313, S413: the object side of the fourth lens

S114, S214, S314, S414: the side of the fourth lens image

S115, S215, S315, S415: fifth lens object side

S116, S216, S316, S416: fifth lens image side

S117, S217, S317, S417: side of the filter object

S118, S218, S318, S418: Filter image side

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

Figure 2A is a Field Curvature diagram of the first embodiment of the imaging lens according to the present invention.

Fig. 2B is a distortion diagram of the first embodiment of the imaging lens according to the present invention.

Figure 2C is a Modulation Transfer Function diagram of the first embodiment of the imaging lens according to the present invention.

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

Fig. 4A is a field curvature diagram of the second embodiment of the imaging lens according to the present invention.

Fig. 4B is a distortion diagram of the second embodiment of the imaging lens according to the present invention.

Figure 4C is a diagram of the modulation transfer function of the second embodiment of the imaging lens according to the present invention.

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

Fig. 6A is a field curvature diagram of the third embodiment of the imaging lens according to the present invention.

FIG. 6B is a distortion diagram of the third embodiment of the imaging lens according to the present invention.

Fig. 6C is a diagram of the modulation transfer function of the third embodiment of the imaging lens according to the present invention.

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

Fig. 8A is a field curvature diagram of the fourth embodiment of the imaging lens according to the present invention.

FIG. 8B is a distortion diagram of the fourth embodiment of the imaging lens according to the present invention.

Fig. 8C is a diagram of the modulation transfer function of the fourth embodiment of the imaging lens according to the present invention.

The present invention provides an imaging lens, including: a first lens with negative refractive power, the first lens including a concave surface facing a first object side; a reflective element, the reflective element including a reflective surface; a second lens with positive refractive power , The second lens includes a convex surface facing a second object side; a third lens has a positive refractive power, and the third lens includes a convex surface facing the second object side; A fourth lens has negative refractive power; and a fifth lens has positive refractive power. The fifth lens includes a convex surface facing a second image side; wherein the first lens and the reflective element are along a first optical axis from the first object side The reflective element, the second lens, the third lens, the fourth lens and the fifth lens are arranged in sequence from the second object side to the second image side along a second optical axis; wherein The first optical axis intersects the second optical axis; the imaging lens meets the following conditions: 0<f/L1T<5; where f is an effective focal length of the imaging lens, and L1T is a thickness of the first lens along the first optical axis .

Please refer to Table 1, Table 2, Table 4, Table 5, Table 7, Table 8, Table 10, and Table 11 at the bottom. Table 1, Table 4, Table 7 and Table 10 are respectively the first imaging lens according to the present invention. The related parameter table of each lens of the first embodiment to the fourth embodiment, Table 2, Table 5, Table 8 and Table 11 are the aspheric surface of the aspheric lens in Table 1, Table 4, Table 7 and Table 10, respectively Related parameter table.

Figures 1, 3, 5, and 7 are respectively the lens configuration and optical path diagrams of the first, second, third, and fourth embodiments of the imaging lens of the present invention. The first lenses L11, L21, L31, and L41 have negative refractive power and are It is made of glass material, and its side surfaces S14, S24, S34, and S44 are concave.

The reflective elements P1, P2, P3, and P4 are made of glass or plastic materials. The incident surfaces S16, S26, S36, and S46 are flat surfaces, the reflecting surfaces S17, S27, S37, and S47 are flat surfaces, and the exit surfaces S18, S28, S38, S48 is a plane. The reflecting element may be a mirror or a reflecting mirror, and when it is a reflecting mirror, it may only include a reflecting surface.

The second lens L12, L22, L32, L42 has positive refractive power and is made of plastic material. Its object side surfaces S19, S29, S39, S49 are convex surfaces, and the object side surfaces S19, S29, S39, S49 and image side surfaces S110, S210, S310 , S410 are aspherical surfaces.

The third lens L13, L23, L33, L43 has positive refractive power and is made of plastic The object side surfaces S111, S211, S311, S411 are convex surfaces, and the object side surfaces S111, S211, S311, S411 and the image side surfaces S112, S212, S312, S412 are all aspherical surfaces.

The fourth lenses L14, L24, L34, and L44 have negative refractive power and are made of plastic material. The object sides S113, S213, S313, S413 and the image sides S114, S214, S314, and S414 are all aspherical surfaces.

The fifth lenses L15, L25, L35, L45 have positive refractive power and are made of plastic material. The image side surfaces S116, S216, S316, S416 are convex, and the object side surfaces S115, S215, S315, S415 and the image side surfaces S116, S216, S316 , S416 are aspherical surfaces.

In addition, the imaging lenses 1, 2, 3, and 4 meet at least one of the following conditions:

-12<f ₁ /L1T<0 (1)

0.1<SD5/TTL<0.6 (2)

4<TTL/SD1<14 (3)

0.5<MT/L1T<10 (4)

0<MT/(SD2+SD3+SD4+SD5)<1 (5)

2mm<L<6mm (6)

1<TTL/L<5 (7)

0<f/L<2 (8)

-20<R ₁₁ /L1T<0 (9)

0.5<SD1/L1T<3 (10)

2<ALD/f<8 (11)

0<f/L1T<5 (12)

Among them, f is the effective focal length of one of the imaging lenses 1, 2, 3, 4 in the _{first embodiment to the fourth embodiment, and f 1} is the first lens L11, L21, and L21 in the first embodiment to the fourth embodiment. One of the effective focal lengths of L31 and L41, L1T is the thickness of the first lens L11, L21, L31, L41 along the first optical axis OA11, OA21, OA31, OA41 in the first to fourth embodiments, namely The object sides S14, S24, S34, and S44 of the first lenses L11, L21, L31, L41 and the image sides S15, S25, S35, S45 are spaced on the first optical axis OA11, OA21, OA31, OA41, respectively, SD1 is In the first to fourth embodiments, the optical effective diameter of one of the first lenses L11, L21, L31, L41, SD2 is the second lens L12, L22, L32, L42 in the first to fourth embodiments One of the optical effective diameters, SD3 is the optical effective diameter of one of the third lenses L13, L23, L33, L43 in the first to fourth embodiments, and SD4 is the fourth in the first to fourth embodiments One of the optical effective diameters of the lenses L14, L24, L34, L44, SD5 is the optical effective diameter of one of the first to fourth embodiments, the fifth lens L15, L25, L35, L45, and TTL is the first to fourth embodiments In the fourth embodiment, the object sides S14, S24, S34, and S44 of the first lenses L11, L21, L31, and L41 are respectively to the imaging planes IMA1, IMA2, IMA3, IMA4 on the first optical axis OA11, OA21, OA31, OA41 and A pitch on the second optical axis OA12, OA22, OA32, OA41, MT is the first embodiment to the fourth embodiment, the incident surfaces S16, S26, S36, S46 are respectively passed through the reflective surfaces S17, S27, S37, S47 to The exit surfaces S18, S28, S38, and S48 are at a pitch on the first optical axis OA11, OA21, OA31, OA41 and the second optical axis OA12, OA22, OA32, OA41, and L is in the first embodiment to the fourth embodiment , One of the object side surfaces S14, S24, S34, and S44 of the first lenses L11, L21, L31, L41 to the reflective surfaces S17, S27, S37, S47 are spaced apart on the first optical axis OA11, OA21, OA31, OA41, R ₁₁ is the curvature radius of one of the object sides S14, S24, S34, S44 of the first lens L11, L21, L31, and L41 in the first to fourth embodiments, and ALD is the first to fourth embodiments, respectively In the embodiment, the sum of the optical effective diameter of each lens. The imaging lens 1, 2, 3, 4 can effectively reduce the total length of the lens, effectively reduce the outer diameter of the lens, effectively improve the resolution, effectively correct aberrations, effectively correct chromatic aberrations, and make the manufacturing process easier.

The first embodiment of the imaging lens of the present invention will now be described in detail. Referring to Figure 1, the imaging lens 1 includes a protective glass CG1, an aperture ST1, a first lens L11, a reflective element P1, a second lens L12, a third lens L13, a fourth lens L14, and a first lens. Five lenses L15 and one filter OF1. The protective glass CG1, the aperture ST1, the first lens L11, and the reflective element P1 are arranged in order from a first object side to a first image side along a first optical axis OA11. The reflective element P1, the second lens L12, and the third lens The lens L13, the fourth lens L14, the fifth lens L15 and the filter OF1 are arranged in order from a second object side to a second image side along a second optical axis OA12. The first optical axis OA11 and the second optical axis OA12 intersect and are perpendicular to each other. The reflective element P1 includes an incident surface S16, a reflective surface S17, and an exit surface S18, and the incident surface S16 and the exit surface S18 are perpendicular to each other. During imaging, the light from the first object side is reflected by the reflecting surface S17 to change the traveling direction, and finally is imaged on an imaging surface IMA1, and the imaging surface IMA1 and the exit surface S18 are parallel to each other. In the first embodiment, the reflective element is an example but not limited to this. The reflective element may also be a reflective mirror, which only includes a reflective surface. According to [Implementation Mode] paragraphs 1 to 8, in which:

The object side surface S11 and the image side surface S12 of the protective glass CG1 are both flat surfaces; the first lens L11 is a plano-concave lens, the image side surface S15 is a flat surface, and the object side surface S14 is a spherical surface; the second lens L12 is a biconvex lens, and the image side surface S110 is Convex; the third lens L13 is a meniscus lens with a concave image side S112; the fourth lens L14 is a meniscus lens with a concave object side S113 and a convex image side S114; the fifth lens L15 is a biconvex lens, The object side surface S115 is a convex surface; the object side surface S117 and the image side surface S118 of the filter OF1 are both flat surfaces.

Use the above lens, aperture ST1, reflective element P1 and at least meet the condition (1) The design of one of the conditions to condition (12) enables the imaging lens 1 to effectively reduce the total length of the lens, effectively reduce the outer diameter of the lens, effectively improve the resolution, effectively correct aberrations, effectively correct chromatic aberrations, and make processing easier .

Table 1 is a table of related parameters of each lens of the imaging lens 1 in Figure 1.

The aspheric surface concavity z of the aspheric lens in Table 1 is obtained by the following formula:

z=ch ² /{1+[1-(k+1)c ² h] ^1/2 }+Ah ⁴ +Bh ⁶ +Ch ⁸ +Dh ¹⁰ +Eh ¹² +Fh ¹⁴ +Gh ¹⁶ +Hh ¹⁸ +Ih ²⁰ +Jh ³ +Kh ⁵ +Lh ⁷

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

Table 2 is a table of related parameters of the aspheric surface of the aspheric lens in Table 1, where k is the Conic Constant, and A~L are the aspheric coefficients.

Table 3 shows the relevant parameter values of the imaging lens 1 of the first embodiment and the calculated values of the corresponding conditions (1) to (12). From Table 3, it can be seen that the imaging lens 1 of the first embodiment can all satisfy the condition (1). ) To the requirements of condition (12).

In addition, the optical performance of the imaging lens 1 of the first embodiment can also meet the requirements. It can be seen from FIG. 2A that the curvature of field of the imaging lens 1 of the first embodiment is between 0.06 mm and 0.16 mm. It can be seen from FIG. 2B that the distortion of the imaging lens 1 of the first embodiment is between -0.5% and 2.5%. It can be seen from FIG. 2C that the value of the modulation transfer function of the imaging lens 1 of the first embodiment is between 0.17 and 1.0.

It is obvious that the field curvature and distortion of the imaging lens 1 of the first embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.

Please refer to FIG. 3, which is a schematic diagram of the lens configuration and optical path of the second embodiment of the imaging lens according to the present invention. The imaging lens 2 includes a protective glass CG2, an aperture ST2, a first lens L21, a reflective element P2, a second lens L22, a third lens L23, a fourth lens L24, a fifth lens L25, and a filter Light film OF2. The protective glass CG2, the aperture ST2, the first lens L21, and the reflective element P2 are arranged in order from a first object side to a first image side along a first optical axis OA21, and the reflective element P2, the second lens L22, and the third lens The lens L23, the fourth lens L24, the fifth lens L25 and the filter OF2 are arranged in order from a second object side to a second image side along a second optical axis OA22. The first optical axis OA21 and the second optical axis OA22 intersect and are perpendicular to each other. The reflective element P2 includes an incident surface S26, a reflective surface S27, and an exit surface S28, and the incident surface S26 and the exit surface S28 are perpendicular to each other. During imaging, the light from the first object side is reflected by the reflecting surface S27 to change the direction of travel, and finally imaged on an imaging surface IMA2, the imaging surface IMA2 and the exit surface S28 Parallel to each other. In the second embodiment, the reflective element is taken as an example but not limited to this. The reflective element may also be a reflective mirror, which only includes a reflective surface. According to [Implementation Mode] paragraphs 1 to 8, in which:

The object side surface S21 and the image side surface S22 of the protective glass CG2 are both flat; the first lens L21 is a plano-concave lens, the image side surface S25 is a flat surface, and the object side surface S24 is an aspherical surface; the second lens L22 is a biconvex lens, and its image side surface S210 The third lens L23 is a meniscus lens with a concave image side surface S212; the fourth lens L24 is a meniscus lens with a concave object side surface S213 and the image side surface S214 is a convex surface; the fifth lens L25 is a double convex lens , The object side surface S215 is a convex surface; the object side surface S217 and the image side surface S218 of the filter OF2 are both flat surfaces.

Using the above-mentioned lens, iris ST2, reflective element P2, and a design that meets at least one of the conditions (1) to (12), the imaging lens 2 can effectively reduce the total length of the lens, effectively reduce the lens outer diameter, and effectively improve Resolution, effective correction of aberration, effective correction of chromatic aberration, easy processing.

Table 4 is a table of related parameters of each lens of the imaging lens 2 in Figure 3.

The definition of the aspheric surface concavity z of the aspheric lens in Table 4 is the same as the definition of the aspheric surface concavity z of the aspheric lens in Table 1 in the first embodiment, and will not be repeated here.

Table 5 is a table of related parameters of the aspheric surface of the aspheric lens in Table 4, where k is the Conic Constant, and A~L are the aspheric coefficients.

Table 6 shows the relevant parameter values of the imaging lens 2 of the second embodiment and the calculated values of the corresponding conditions (1) to (12). From Table 6, it can be seen that the imaging lens 2 of the second embodiment can all meet the condition (1). ) To the requirements of condition (12).

In addition, the optical performance of the imaging lens 2 of the second embodiment can also meet the requirements. It can be seen from FIG. 4A that the curvature of field of the imaging lens 2 of the second embodiment is between -0.4 mm and 0.1 mm. It can be seen from FIG. 4B that the distortion of the imaging lens 2 of the second embodiment is between 0% and 3%. It can be seen from FIG. 4C that the value of the modulation transfer function of the imaging lens 2 of the second embodiment is between 0.27 and 1.0.

It is obvious that the field curvature and distortion of the imaging lens 2 of the second embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.

Please refer to FIG. 5, which is a schematic diagram of the lens configuration and optical path of the third embodiment of the imaging lens according to the present invention. The imaging lens 3 includes a protective glass CG3, an aperture ST3, a first lens L31, a reflective element P3, a second lens L32, a third lens L33, a fourth lens L34, a fifth lens L35, and a filter Light film OF3. Protective glass CG3, aperture ST3, the first lens L31, and the reflective element P3 are arranged in order from a first object side to a first image side along a first optical axis OA31. The reflective element P3, the second lens L32, the third lens L33, and the fourth lens are arranged in sequence along a first optical axis OA31. The lens L34, the fifth lens L35 and the filter OF3 are arranged in order from a second object side to a second image side along a second optical axis OA32. The first optical axis OA31 and the second optical axis OA32 intersect and are perpendicular to each other. The reflective element P3 includes an incident surface S36, a reflective surface S37, and an exit surface S38, and the incident surface S36 and the exit surface S38 are perpendicular to each other. During imaging, the light from the first object side is reflected by the reflecting surface S37 to change the traveling direction, and finally is imaged on an imaging surface IMA3, and the imaging surface IMA3 and the exit surface S38 are parallel to each other. In the third embodiment, the reflective element is taken as an example but not limited to this. The reflective element may also be a reflective mirror, which only includes a reflective surface. According to [Implementation Mode] paragraphs 1 to 8, in which:

The object side surface S31 and the image side surface S32 of the protective glass CG3 are both flat; the first lens L31 is a plano-concave lens, the image side surface S35 is a flat surface, and the object side surface S34 is an aspheric surface; the second lens L32 is a meniscus lens with an image The side surface S310 is a concave surface; the third lens L33 is a biconvex lens, and its image side surface S312 is a convex surface; the fourth lens L34 is a meniscus lens, its object side surface S313 is a convex surface, and the image side surface S314 is a concave surface; the fifth lens L35 is a biconvex lens , The object side surface S315 is convex; the object side surface S317 and the image side surface S318 of the filter OF3 are both flat surfaces.

Using the above-mentioned lens, iris ST3, reflective element P3, and a design that meets at least one of conditions (1) to (12), the imaging lens 3 can effectively reduce the total length of the lens, effectively reduce the lens outer diameter, and effectively improve Resolution, effective correction of aberration, effective correction of chromatic aberration, easy processing.

Table 7 is a table of related parameters of each lens of the imaging lens 3 in Figure 5.

The definition of the aspheric surface concavity z of the aspheric lens in Table 7 is the same as the definition of the aspheric surface concavity z of the aspheric lens in Table 1 in the first embodiment, and will not be repeated here.

Table 8 is a table of related parameters of the aspheric surface of the aspheric lens in Table 7, where k is the Conic Constant, and A~L are the aspheric coefficients.

Table 9 shows the relevant parameter values of the imaging lens 3 of the third embodiment and the calculated values of the corresponding conditions (1) to (12). From Table 9, it can be seen that the imaging lens 3 of the third embodiment can all satisfy the condition (1). ) To the requirements of condition (12).

In addition, the optical performance of the imaging lens 3 of the third embodiment can also meet the requirements. It can be seen from FIG. 6A that the curvature of field of the imaging lens 3 of the third embodiment is between -0.3mm and 0.15mm. It can be seen from Fig. 6B that the distortion of the imaging lens 3 of the third embodiment is between -1% and 4% between. It can be seen from FIG. 6C that the value of the modulation transfer function of the imaging lens 3 of the third embodiment is between 0.17 and 1.0.

It is obvious that the field curvature and distortion of the imaging lens 3 of the third embodiment can be effectively corrected, and the lens resolution can also meet the requirements, thereby obtaining better optical performance.

Please refer to FIG. 7, which is a schematic diagram of the lens configuration and optical path of the fourth embodiment of the imaging lens according to the present invention. The imaging lens 4 includes a protective glass CG4, an aperture ST4, a first lens L41, a reflective element P4, a second lens L42, a third lens L43, a fourth lens L44, a fifth lens L45, and a filter Light film OF4. The protective glass CG4, the aperture ST4, the first lens L41, and the reflective element P4 are arranged in order from a first object side to a first image side along a first optical axis OA41. The reflective element P4, the second lens L42, and the third The lens L43, the fourth lens L44, the fifth lens L45 and the filter OF4 are arranged in order from a second object side to a second image side along a second optical axis OA42. The first optical axis OA41 and the second optical axis OA42 intersect and are perpendicular to each other. The reflective element P4 includes an incident surface S46, a reflective surface S47, and an exit surface S48. The incident surface S46 and the exit surface S48 are perpendicular to each other. During imaging, the light from the first object side is reflected by the reflecting surface S47 to change the traveling direction, and finally is imaged on an imaging surface IMA4, and the imaging surface IMA4 and the exit surface S48 are parallel to each other. In the fourth embodiment, the reflective element is taken as an example but not limited to this. The reflective element may also be a reflective mirror, which only includes a reflective surface. According to [Implementation Mode] paragraphs 1 to 8, in which:

The object side surface S41 and the image side surface S42 of the protective glass CG4 are both flat; the first lens L41 is a biconcave lens, the image side surface S45 is concave, the object side S44 is an aspheric surface, and the image side S45 is a spherical surface; the second lens L42 is Meniscus lens, the image side S410 is concave; the third lens L43 is a biconvex lens, the image side S412 is convex; the fourth lens L44 is a meniscus lens, the object side S413 is convex, and the image side S414 is concave; The fifth lens L45 is curved The object side surface S415 of the lunar lens is concave; the object side surface S417 and the image side surface S418 of the filter OF4 are both flat surfaces.

Using the above-mentioned lens, iris ST4, reflective element P4 and a design that satisfies at least one of the conditions (1) to (12), the imaging lens 4 can effectively reduce the total length of the lens, effectively reduce the lens outer diameter, and effectively improve Resolution, effective correction of aberration, effective correction of chromatic aberration, easy processing.

Table 10 is a table of related parameters of each lens of the imaging lens 4 in Figure 7.

The definition of the aspheric surface concavity z of the aspheric lens in Table 10 is the same as the definition of the aspheric surface concavity z of the aspheric lens in Table 1 in the first embodiment, and it is not here. Go into details.

Table 11 is a table of related parameters of the aspheric surface of the aspheric lens in Table 10, where k is the Conic Constant, and A~L are the aspheric coefficients.

Table 12 shows the relevant parameter values of the imaging lens 4 of the fourth embodiment and the calculated values of the corresponding conditions (1) to (12). From Table 12, it can be seen that the imaging lens 4 of the fourth embodiment All can meet the requirements of condition (1) to condition (12).

In addition, the optical performance of the imaging lens 4 of the fourth embodiment can also meet the requirements. It can be seen from FIG. 8A that the curvature of field of the imaging lens 4 of the fourth embodiment is between -0.2 mm and 0.08 mm. It can be seen from FIG. 8B that the distortion of the imaging lens 4 of the fourth embodiment is between -0.1% and 1.8%. It can be seen from FIG. 8C that the value of the modulation transfer function of the imaging lens 4 of the fourth embodiment is between 0.01 and 1.0.

It is obvious that the field curvature and distortion of the imaging lens 4 of the fourth embodiment can be effectively corrected, and the lens resolution 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.

1: imaging lens

CG1: Protective glass

ST1: Aperture

L11: The first lens

P1: reflective element

L12: second lens

L13: third lens

L14: Fourth lens

L15: fifth lens

OF1: filter

IMA1: imaging surface

OA11: First optical axis

OA12: second optical axis

S11: Protect the side of the glass object

S12: Protect the side of the glass image

S13: Aperture surface

S14: Object side of the first lens

S15: The side of the first lens image

S16: incident surface of reflective element

S17: reflective surface of reflective element

S18: Reflective element exit surface

S19: Second lens object side

S110: Second lens image side

S111: Third lens object side

S112: Third lens image side

S113: Object side of the fourth lens

S114: Fourth lens image side

S115: fifth lens object side

S116: Side view of the fifth lens

S117: Side of the filter object

S118: Filter image side

Claims (10)

An imaging lens includes: a first lens with negative refractive power, the first lens including a concave surface facing a first object side; Facing the first object side, the exit surface facing a second image side; a second lens having positive refractive power, the second lens including a convex surface facing a second object side; a third lens having positive refractive power, the first The three lenses include a convex surface facing the second object side; a fourth lens with negative refractive power; and a fifth lens with positive refractive power. The fifth lens includes a convex surface facing the second image side; wherein the first lens and the The reflective element is arranged in sequence along a first optical axis from the first object side to a first image side; wherein the reflective element, the second lens, the third lens, the fourth lens and the fifth lens are arranged along a Arranged in sequence from the second object side to the second image side along a second optical axis; wherein the first optical axis intersects the second optical axis; the imaging lens satisfies at least one of the following conditions: 0.1<SD5 /TTL<0.6; 4<TTL/SD1<14; 0.5<SD1/L1T<3; 1<TTL/L<5; 0<MT/(SD2+SD3+SD4+SD5)<1.0; 2<ALD/f <8; Where f is an effective focal length of the imaging lens, L1T is a thickness of the first lens along the first optical axis, SD1 is an optical effective diameter of the first lens, and SD2 is an optical diameter of the second lens. Effective diameter, SD3 is an optical effective diameter of the third lens, SD4 is an optical effective diameter of the fourth lens, SD5 is an optical effective diameter of the fifth lens, TTL is an object side of the first lens to A distance between an imaging surface on the first optical axis and the second optical axis, L is a distance from the object side of the first lens to the reflecting surface on the first optical axis, and MT is the incident surface A distance between the reflective surface and the exit surface on the first optical axis and the second optical axis, ALD is the sum of the optical effective diameters of the lenses of the imaging lens. An imaging lens includes: a first lens with negative refractive power, the first lens including a concave surface facing a first object side; a reflective element, the reflective element including a reflective surface; a second lens with positive refractive power, the first lens Two lenses include a convex surface facing a second object side; a third lens has a positive refractive power, the third lens includes a convex surface facing the second object side; a fourth lens is a meniscus lens with negative refractive power; and a first lens The five lenses have positive refractive power, and the fifth lens includes a convex surface facing a second image side; wherein the first lens and the reflective element are sequentially along a first optical axis from the first object side to a first image side Arrangement; wherein the reflective element, the second lens, the third lens, the fourth lens and the fifth lens are arranged in order from the second object side to the second image side along a second optical axis; wherein The first optical axis intersects the second optical axis; the imaging lens satisfies the following conditions: 0<f/L1T<5; Wherein, f is an effective focal length of the imaging lens, and L1T is a thickness of the first lens along the first optical axis. An imaging lens includes: a first lens with negative refractive power, the first lens including a concave surface facing a first object side; a reflective element, the reflective element including a reflective surface; a second lens with positive refractive power, the first lens The two lenses include a convex surface facing a second object side; a third lens is a meniscus lens with positive refractive power, the third lens includes a convex surface facing the second object side; a fourth lens has negative refractive power; and a first lens The five lenses have positive refractive power, and the fifth lens includes a convex surface facing a second image side; wherein the first lens and the reflective element are sequentially along a first optical axis from the first object side to a first image side Arrangement; wherein the reflective element, the second lens, the third lens, the fourth lens and the fifth lens are arranged in order from the second object side to the second image side along a second optical axis; wherein The first optical axis intersects the second optical axis; the imaging lens meets at least one of the following conditions: 0<f/L1T<5; where L1T is a thickness of the first lens along the first optical axis , F is an effective focal length of the imaging lens. An imaging lens comprising: a first lens having a negative refractive power, the first lens including a concave surface facing a first object side; a reflecting element, the reflecting element including a reflecting surface; A second lens is a biconvex lens with positive refractive power, the second lens includes a convex surface facing a second object side; a third lens has a positive refractive power, the third lens includes a convex surface facing the second object side; a fourth lens The lens has negative refractive power; and a fifth lens has positive refractive power, the fifth lens includes a convex surface facing a second image side; wherein the first lens and the reflective element are along a first optical axis from the first object side To a first image side in sequence; wherein the reflective element, the second lens, the third lens, the fourth lens, and the fifth lens are along a second optical axis from the second object side to the first The two image sides are arranged in sequence; the first optical axis intersects the second optical axis; the imaging lens meets at least one of the following conditions: 0<f/L1T<5; where f is one of the imaging lenses valid Focal length, L1T is a thickness of the first lens along the first optical axis. An imaging lens includes: a first lens with negative refractive power, the first lens including a concave surface facing a first object side; a reflective element, the reflective element including a reflective surface; a second lens with positive refractive power, the first lens Two lenses include a convex surface facing a second object side; a third lens has a positive refractive power, the third lens includes a convex surface facing the second object side; a fourth lens has a negative refractive power; and a fifth lens has a positive refractive power , The fifth lens includes a concave surface facing the second object side and a convex surface facing a second image side; The first lens and the reflective element are arranged in sequence along a first optical axis from the first object side to a first image side; wherein the reflective element, the second lens, the third lens, and the fourth lens The lens and the fifth lens are arranged in sequence along a second optical axis from the second object side to the second image side; wherein the first optical axis intersects the second optical axis; the imaging lens at least satisfies the following A condition: 0<f/L1T<5; where f is an effective focal length of the imaging lens, and L1T is a thickness of the first lens along the first optical axis. The imaging lens described in any one of claims 1 to 5 in the scope of the patent application, wherein the first lens further includes a flat surface or a concave surface facing the first image side, and the fourth lens is a meniscus lens , The first optical axis and the second optical axis are perpendicular to each other. The imaging lens according to any one of claims 1 to 5 of the scope of patent application, wherein the fifth lens further includes another convex surface or a concave surface facing the second object side. The imaging lens according to any one of claims 1 to 5 of the scope of patent application, wherein: the second lens is a biconvex lens, and further includes another convex surface facing the second image side; the third lens is a curved lens The lunar lens further includes a concave surface facing the second image side; the fourth lens includes a concave surface facing the second object side and a convex surface facing the second image side. The imaging lens described in any one of claims 1 to 5 of the scope of the patent application, wherein the imaging lens meets at least one of the following conditions: -20<R ₁₁ /L1T<0;0.5<MT/L1T<10;2mm<L<6mm;0<f/L<2;-12<f ₁ /L1T<0; where R _{11 is} the radius of curvature of an object side surface of the first lens, and L1T is the first lens The thickness along the first optical axis, MT is the distance from the incident surface through the reflecting surface to the exit surface on the first optical axis and the second optical axis, and L is the object of the first lens For the distance from the side surface to the reflecting surface on the first optical axis, f is the effective focal length of the imaging lens, and f _{1 is} an effective focal length of the first lens. The imaging lens described in item 1, item 2, or item 5 of the scope of patent application, wherein: the second lens is a meniscus lens, and further includes a concave surface facing the second image side; the third lens is a double The convex lens further includes another convex surface facing the second image side; the fourth lens includes a convex surface facing the second object side and a concave surface facing the second image side.

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