TW202201063A - 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 present invention relates to an imaging lens.

Nowadays, the development trend of imaging lenses for mobile phones is constantly developing towards high resolution. The number of lenses used in imaging lenses is increasing, which makes the total length of the imaging lens and the outer diameter of the imaging lens larger and larger. Compared with the internal volume ratio of mobile phones, the ratio is also increasing, which can no longer meet the needs of thin and light mobile phones. Therefore, another imaging lens with a new architecture is required 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 short overall lens length, a small lens outer diameter, high resolution, and easy manufacturing process, but still has good optical performance.

The imaging lens of the present invention includes a first lens, a reflecting 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 sides are arranged in order. The reflecting element, the second lens, the third lens, the fourth lens and the fifth lens are sequentially arranged along a second optical axis from the second object side to the second image side. 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.

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

The second lens is a meniscus lens and may further include a concave surface facing the second image side, the third lens is a biconvex lens, and 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 facing 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; where SD1 is the optical effective diameter of one of the first lenses, and SD5 is An optical effective diameter of the fifth lens, TTL is the distance between the object side of the first lens and an imaging surface on the first optical axis and the second optical axis, 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, and the imaging lens satisfies at least one of the following conditions: 0.5<MT/L1T<10; 0<MT/(SD2+SD3 +SD4+SD5)<1.0; wherein, MT is the distance from the incident surface to the exit surface on the first optical axis and the second optical axis, L1T is the thickness of the first lens along the first optical axis degree, SD2 is an optical effective diameter of the second lens, SD3 is an optical effective diameter of the third lens, SD4 is an optical effective diameter of the fourth lens, and SD5 is an optical effective diameter 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 from the object side of the first lens to the reflection surface of the first lens A distance on the optical axis, TTL is the distance between the object side of the first lens and an imaging surface on the first optical axis and the second optical axis, f is an effective focal length of the imaging lens.

The imaging lens satisfies the following conditions: -20<R ₁₁ /L1T<0; wherein 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; among them, ALD is the sum of the optical effective diameters of the lenses of the imaging lens, and f is the sum of the optical effective diameters of the imaging lenses. An effective focal length, f1 is _an effective focal length of the first lens, L1T is a thickness of the first lens along the first optical axis.

In order to make the above objects, features, and advantages of the present invention more clearly understood, preferred embodiments are hereinafter described in detail 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 elements

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: Filters

IMA1, IMA2, IMA3, IMA4: Imaging plane

OA11, OA21, OA31, OA41: the 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: Protective glass image side

S13, S23, S33, S43: Aperture surface

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

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

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

S17, S27, S37, S47: Reflective element reflecting surface

S18, S28, S38, S48: Reflective element exit surface

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

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

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

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

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

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

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

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

S117, S217, S317, S417: Side of filter object

S118, S218, S318, S418: Filter image side

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

FIG. 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.

FIG. 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 a 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.

FIG. 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 a lens configuration and an optical path of a third embodiment of the imaging lens according to the present invention.

FIG. 6A is a field curvature diagram of a 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 modulation transfer function diagram 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 a 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 modulation transfer function diagram of the fourth embodiment of the imaging lens according to the present invention.

The invention provides an imaging lens, comprising: a first lens with negative refractive power, the first lens includes a concave surface facing a first object side; a reflection element, the reflection element includes a reflection surface; a second lens with positive refractive power , the second lens includes a convex surface facing a second object side; a third lens has 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 Arranged sequentially to the first image side; wherein the reflective element, the second lens, the third lens, the fourth lens and the fifth lens are sequentially arranged 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 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 .

Please refer to Table 1, Table 2, Table 4, Table 5, Table 7, Table 8, Table 10 and Table 11 below, among which Table 1, Table 4, Table 7 and Table 10 are respectively the first and second images of the imaging lens according to the present invention. Tables 2, 5, 8 and 11 of the relevant parameters of the lenses from the first embodiment to the fourth embodiment are the aspheric surfaces of the aspherical lenses in Table 1, Table 4, Table 7 and Table 10, respectively. Related parameter table.

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

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

The second lenses L12, L22, L32, and L42 have positive refractive power and are made of plastic material. The object sides S19, S29, S39, and S49 are convex, the object sides S19, S29, S39, and S49 and the image sides S110, S210, and S310. , S410 are all aspherical surfaces.

The third lenses L13, L23, L33, L43 have positive refractive power and are made of plastic The object side surfaces S111, S211, S311 and S411 are convex surfaces, and the object side surfaces S111, S211, S311 and S411 and the image side surfaces S112, S212, S312 and 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 side surfaces S113, S213, S313, S413 and the image side surfaces S114, S214, S314, and S414 are all aspherical surfaces.

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

In addition, imaging lenses 1, 2, 3, and 4 satisfy 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<R11 / _L1T <0 (9)

0.5<SD1/L1T<3 (10)

2<ALD/f<8 (11)

0<f/L1T<5 (12)

Among them, f is one of the effective focal lengths of the imaging lenses 1, 2, 3, and 4 in the first to fourth embodiments, and f ₁ is the first to fourth embodiments, the first lenses L11, L21, One of the effective focal lengths of L31 and L41, and L1T is one of the thicknesses of the first lenses L11, L21, L31, and L41 along the first optical axes OA11, OA21, OA31, and OA41 in the first to fourth embodiments, respectively, that is, The distance between the object side surfaces S14, S24, S34, and S44 of the first lenses L11, L21, L31, and L41 to the image side surfaces S15, S25, S35, and S45 on the first optical axis OA11, OA21, OA31, and OA41, respectively, SD1 is In the first to fourth embodiments, an optical effective diameter of the first lenses L11, L21, L31, L41, SD2 is the first to fourth embodiments, the second lens L12, L22, L32, L42 An optical effective diameter, SD3 is an optical effective diameter of the third lens L13, L23, L33, L43 in the first to fourth embodiments, SD4 is the first to fourth embodiments, the fourth An optical effective diameter of the lenses L14, L24, L34, and L44, SD5 is an optical effective diameter of the fifth lens L15, L25, L35, and L45 in the first to fourth embodiments, and TTL is an optical effective diameter of the first to fourth embodiments. In the fourth embodiment, the object side surfaces S14, S24, S34, and S44 of the first lenses L11, L21, L31, and L41 respectively reach the imaging planes IMA1, IMA2, IMA3, and IMA4 on the first optical axes OA11, OA21, OA31, OA41, and OA41, respectively. A spacing on the second optical axis OA12, OA22, OA32, OA41, MT is the first embodiment to the fourth embodiment, the incident surface S16, S26, S36, S46 through the reflection surface S17, S27, S37, S47 to A distance between the exit surfaces S18, S28, S38, S48 on the first optical axis OA11, OA21, OA31, OA41 and the second optical axis OA12, OA22, OA32, OA41, L is the first embodiment to the fourth embodiment. , one of the object sides S14, S24, S34, and S44 of the first lenses L11, L21, L31, and L41 respectively to the reflective surfaces S17, S27, S37, and S47 on the first optical axis OA11, OA21, OA31, and OA41. A spacing, R11 is a curvature radius of one of the object side surfaces S14, S24, S34, and S44 of one of the first lenses L11, L21, L31, and _L41 in the first embodiment to the fourth embodiment, and ALD is the first embodiment to the fourth embodiment, respectively. In the embodiment, the sum of the optical effective diameters of each lens. The imaging lenses 1, 2, 3, and 4 can effectively reduce the total length of the lens, effectively reduce the outer diameter of the lens, effectively improve the resolution, effectively correct the aberration, and effectively correct the chromatic aberration, and the process is easy to process.

The first embodiment of the imaging lens of the present invention will now be described in detail. Please refer to FIG. 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, a first lens Five lenses L15 and a filter OF1. The protective glass CG1, the aperture ST1, the first lens L11 and the reflective element P1 are sequentially arranged along a first optical axis OA11 from a first object side to a first image side, the reflective element P1, the second lens L12, the third The lens L13 , the fourth lens L14 , the fifth lens L15 and the filter OF1 are sequentially arranged along a second optical axis OA12 from a second object side to a second image side. The first optical axis OA11 and the second optical axis OA12 intersect and are perpendicular to each other. The reflecting element P1 includes an incident surface S16, a reflecting 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 reflective surface S17 to change the traveling direction, and finally is imaged on an imaging surface IMA1, the imaging surface IMA1 and the exit surface S18 are parallel to each other. In the first implementation, the reflective element is taken as an example but not limited to this, and the reflective element can also be a reflective mirror, which only includes a reflective surface. According to the first to eighth paragraphs of [Embodiment], wherein:

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

Using the above-mentioned lens, aperture ST1, reflective element P1 and at least satisfying condition (1) To the design of one of the conditions (12), the imaging lens 1 can effectively reduce the total length of the lens, effectively reduce the outer diameter of the lens, effectively improve the resolution, effectively correct the aberration, effectively correct the chromatic aberration, and the process is easy to process. .

Table 1 is a table of relevant parameters of each lens of the imaging lens 1 in the first figure.

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: aspheric coefficient.

Table 2 is a table of relevant 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). It can be seen from Table 3 that the imaging lens 1 of the first embodiment can meet the conditions (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 field curvature 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 modulation transfer function value 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 resolution of the lens can also meet the requirements, thereby obtaining better optical performance.

Please refer to FIG. 3. FIG. 3 is a schematic diagram of a lens configuration and an optical path of a second embodiment of an 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 sheet OF2. The protective glass CG2, the aperture ST2, the first lens L21 and the reflective element P2 are sequentially arranged along a first optical axis OA21 from a first object side to a first image side, the reflective element P2, the second lens L22, the third The lens L23 , the fourth lens L24 , the fifth lens L25 and the filter OF2 are sequentially arranged along a second optical axis OA22 from a second object side to a second image side. The first optical axis OA21 and the second optical axis OA22 intersect and are perpendicular to each other. The reflecting element P2 includes an incident surface S26, a reflecting surface S27 and an exit surface S28, and the incident surface S26 and the exit surface S28 are perpendicular to each other. When imaging, the light from the first object side is reflected by the reflective surface S27 to change the traveling direction, 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, and the reflective element can also be a reflective mirror, which only includes a reflective surface. According to the first to eighth paragraphs of [Embodiment], wherein:

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

Using the above-mentioned lens, aperture ST2, reflective element P2 and the design that satisfies 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 outer diameter of the lens, and effectively improve the Resolution, effective correction of aberration, effective correction of chromatic aberration, and easy processing.

Table 4 is a table of relevant parameters of each lens of the imaging lens 2 in Fig. 3 .

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

Table 5 is a table of relevant parameters of the aspherical surface of the aspherical lens in Table 4, where k is the Conic Constant and A~L is the aspherical coefficient.

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). It can be seen from Table 6 that the imaging lens 2 of the second embodiment can meet the conditions (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 field curvature 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 modulation transfer function value 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 resolution of the lens can also meet the requirements, thereby obtaining better optical performance.

Please refer to FIG. 5. FIG. 5 is a schematic diagram of a lens configuration and an optical path of a third embodiment of an 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 sheet OF3. Protective glass CG3, aperture ST3, the first lens L31 and the reflective element P3 are sequentially arranged along a first optical axis OA31 from a first object side to a first image side, the reflective element P3, the second lens L32, the third lens L33, the fourth lens The lens L34 , the fifth lens L35 and the filter OF3 are sequentially arranged along a second optical axis OA32 from a second object side to a second image side. The first optical axis OA31 and the second optical axis OA32 intersect and are perpendicular to each other. The reflecting element P3 includes an incident surface S36 , a reflecting 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 reflective surface S37 to change the traveling direction, and finally is imaged on an imaging surface IMA3, 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, and the reflective element can also be a reflective mirror, which only includes a reflective surface. According to the first to eighth paragraphs of [Embodiment], wherein:

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

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

Table 7 is a table of relevant parameters of each lens of the imaging lens 3 in Fig. 5 .

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

Table 8 is a table of relevant 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). It can be seen from Table 9 that the imaging lens 3 of the third embodiment can meet the conditions (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 field curvature of the imaging lens 3 of the third embodiment is between -0.3 mm and 0.15 mm. 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 modulation transfer function value 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 resolution of the lens can also meet the requirements, thereby obtaining better optical performance.

Please refer to FIG. 7. FIG. 7 is a schematic diagram of a lens configuration and an optical path of a fourth embodiment of an 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 sheet OF4. The protective glass CG4, the aperture ST4, the first lens L41 and the reflective element P4 are sequentially arranged along a first optical axis OA41 from a first object side to a first image side, the reflective element P4, the second lens L42, the third The lens L43 , the fourth lens L44 , the fifth lens L45 and the filter OF4 are sequentially arranged along a second optical axis OA42 from a second object side to a second image side. The first optical axis OA41 and the second optical axis OA42 intersect and are perpendicular to each other. The reflecting element P4 includes an incident surface S46, a reflecting surface S47 and an exit surface S48, and 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 reflective 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, and the reflective element can also be a reflective mirror, which only includes a reflective surface. According to the first to eighth paragraphs of [Embodiment], wherein:

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

Using the above-mentioned lens, aperture ST4, reflective element P4 and the 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 outer diameter of the lens, and effectively improve the Resolution, effective correction of aberration, effective correction of chromatic aberration, and easy processing.

Table 10 is a table of relevant parameters of each lens of the imaging lens 4 in Fig. 7 .

The definition of the aspherical surface concavity z of the aspherical lens in Table 10 is the same as the definition of the aspherical surface concavity z of the aspherical lens in Table 1 in the first embodiment. to repeat.

Table 11 is a table of relevant parameters of the aspherical surface of the aspherical lens in Table 10, where k is the Conic Constant and A~L is the aspherical coefficient.

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). It can be seen from Table 12 that the imaging lens 4 of the fourth embodiment All can meet the requirements of conditions (1) to (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 field curvature 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 modulation transfer function value 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 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 determined by the scope of the appended 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 plane

OA11: The first optical axis

OA12: Second optical axis

S11: Protect the side of the glass

S12: Protective glass like side

S13: Aperture Surface

S14: Object side of the first lens

S15: The first lens image side

S16: Reflective element incident surface

S17: Reflective element reflecting surface

S18: Reflective element exit surface

S19: Object side of the second lens

S110: The second lens is like the side

S111: Object side of the third lens

S112: The third lens is like the side

S113: Object side of the fourth lens

S114: Fourth lens image side

S115: Object side of fifth lens

S116: Fifth lens image side

S117: Side of filter object

S118: Filter like side

Claims (10)

An imaging lens, comprising: a first lens having negative refractive power, the first lens includes a concave surface facing a first object side; a reflective element, the reflective element includes 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 having positive refractive power, the third lens includes a convex surface facing the second object side; a fourth lens having negative refractive power; and a fifth lens with positive refractive power, the fifth lens includes a convex surface facing a second image side; wherein the first lens and the reflective element are sequentially arranged along a first optical axis from the first object side to a first image side; wherein the reflecting element, the second lens, the third lens, the fourth lens and the fifth lens are sequentially arranged 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 meets 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. The imaging lens of claim 1, wherein the first lens further comprises a flat surface or a concave surface facing the first image side, the fourth lens is a meniscus lens, and the first optical axis is connected to the first optical axis. The two optical axes are perpendicular to each other. The imaging lens of claim 2, wherein the fifth lens further comprises another convex surface or a concave surface facing the second object side. The imaging lens as described in item 3 of the claimed scope, wherein: The second lens is a biconvex lens, and further includes another convex surface facing the second image side; The third lens is a meniscus lens, and 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 as described in item 3 of the claimed scope, wherein: The second lens is a meniscus lens, further comprising a concave surface facing the second image side; The third lens is a biconvex lens, and 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. The imaging lens according to any one of claims 1 to 5 of the scope of the patent application, wherein 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; Wherein, SD1 is an optical effective diameter of the first lens, SD5 is an optical effective diameter of the fifth lens, and TTL is an object side of the first lens to an imaging plane on the first optical axis and the second A pitch on the optical axis, L1T is a thickness of the first lens along the first optical axis. The imaging lens according to any one of claims 1 to 5 of the scope of the application, wherein: The reflective element further includes an incident surface facing the first object side and an output surface facing the second image side; and The imaging lens meets at least one of the following conditions: 0.5<MT/L1T<10; 0<MT/(SD2+SD3+SD4+SD5)<1.0; Wherein, MT is the distance from the incident surface to the exit surface on the first optical axis and the second optical axis, L1T is a thickness of the first lens along the first optical axis, SD2 is an optical effective diameter of the second lens, SD3 is an optical effective diameter of the third lens, SD4 is an optical effective diameter of the fourth lens, and SD5 is an optical effective diameter of the fifth lens. The imaging lens according to any one of claims 1 to 5 of the scope of the patent application, wherein the imaging lens satisfies at least one of the following conditions: 2mm<L<6mm; 1<TTL/L<5; 0<f/L<2; Wherein, L is the distance from the object side of the first lens to the reflective surface on the first optical axis, and TTL is the distance from the object side of the first lens to an imaging surface on the first optical axis and the first optical axis. A distance on the two optical axes, f is an effective focal length of the imaging lens. The imaging lens according to any one of claims 1 to 5 of the scope of the application, wherein the imaging lens satisfies the following conditions: -20<R11/ _L1T <0; Wherein, R11 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 according to any one of claims 1 to 5 of the scope of the patent application, wherein the imaging lens satisfies at least one of the following conditions: 2<ALD/f<8; -12<f ₁ /L1T<0; Among them, ALD is the total optical effective diameter of each lens of the imaging lens, f is an effective focal length of the imaging lens, f ₁ is an effective focal length of the first lens, and L1T is the first lens along the first lens. The thickness of one of the optical axes.

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