TWI722559B - Lens assembly - Google Patents

Abstract

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

Description

Imaging lens (37)

The invention relates to an imaging lens.

The development trend of today's imaging lenses, in addition to the continuous development towards large apertures and high resolutions, with different application requirements, they also need to have the ability to resist changes in ambient temperature. The conventional imaging lenses can no longer meet today's needs. There is another imaging lens with a new architecture that can simultaneously meet the needs of large aperture, high resolution and resistance to environmental temperature changes.

In view of this, the main purpose of the present invention is to provide an imaging lens with a small aperture value, high resolution, resistance to environmental temperature changes, but still having good optical performance.

The imaging lens of the present invention includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, and a ninth lens . The first lens has negative refractive power and includes a concave surface facing an image side. The second lens has negative refractive power. The third lens has positive refractive power. The fourth lens has positive refractive power. The fifth lens has positive refractive power. The sixth lens has negative refractive power. The seventh lens has refractive power. The eighth lens has refractive power. The ninth lens is a meniscus lens and includes a convex surface facing an object side and a concave surface facing the image side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are arranged in order from the object side to the image side along an optical axis Column.

The third lens includes a convex surface facing the image side, and the sixth lens includes a concave surface facing the object side.

The first lens may further include a concave surface facing the object side, the second lens may include a concave surface facing the object side, and the fourth lens may be a meniscus lens.

The second lens includes a convex surface toward the image side, the third lens includes a convex surface toward the object side, the fourth lens includes a convex surface toward the object side and a concave surface toward the image side, and the fifth lens includes a convex surface toward the object side and another convex surface. Toward the image side, the sixth lens includes a concave surface toward the image side, and the seventh lens has positive refractive power. The seventh lens includes a convex surface facing the object side and another convex surface facing the image side. The eighth lens has positive refractive power. It includes a convex surface facing the object side and another convex surface facing the image side. The ninth lens is a meniscus lens with negative refractive power. The ninth lens includes a convex surface facing the object side and a concave surface facing the image side.

The second lens is a meniscus lens, the fourth lens is a meniscus lens, and the seventh lens has positive refractive power. The seventh lens includes a convex surface facing the object side and another convex surface facing the image side. The eighth lens has negative refractive power. The eighth lens includes a convex surface toward the object side and a concave surface toward the image side. The ninth lens is a meniscus lens with positive refractive power. The ninth lens includes a convex surface toward the object side and a concave surface toward the image side.

The seventh lens includes a concave surface facing the image side, and the eighth lens has positive refractive power. The eighth lens includes a convex surface facing the object side and another convex surface facing the image side. The ninth lens is a meniscus lens with positive refractive power. The nine lenses include a convex surface facing the object side and a concave surface facing the image side. The imaging lens may further include a tenth lens arranged between the sixth lens and the seventh lens. The tenth lens is a meniscus lens with negative refractive power. Ten lenses include a convex surface facing the object side and a concave Face the image side.

The imaging lens satisfies the following conditions: 1<f ₁₂₃₄ /f<2.1; -1.2 _{<f 7} /f ₈ <0.7; where f is one of the effective focal lengths of the imaging lens, f ₁₂₃₄ is the first lens, the second lens, and the The combined effective focal length of one of the three lenses and the fourth lens, f ₇ is an effective focal length of the seventh lens, and f ₈ is an effective focal length of the eighth lens.

The fifth lens is cemented with the sixth lens or the seventh lens is cemented with the eighth lens.

The imaging lens meets the following conditions: 0.2<f/TTL<0.35;7.5<T ₉ //T ₁ <14;1.3<A/IH<2.1; where f is one of the effective focal lengths of the imaging lens, and TTL is the first lens A distance between an object side and an imaging surface on the optical axis, T ₁ is a thickness of the first lens on the optical axis, T ₉ is a thickness of the ninth lens on the optical axis, A is a diameter of the aperture , IH is the maximum image height of one of the imaging lenses.

Condition: 0.2<f/TTL<0.35, which can help the imaging lens to achieve miniaturization. Condition: 1<f ₁₂₃₄ /f<2.1, it can balance the refractive power distribution of the front lens of the imaging lens to effectively control the field of view of the imaging lens and significantly improve the resolution. Condition: -1.2<f ₇ /f ₈ <0.7, the aberration correction function can be better.

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

1, 2, 3‧‧‧imaging lens

L11, L21, L31‧‧‧First lens

L12, L22, L32‧‧‧Second lens

L13, L23, L33‧‧‧third lens

L14, L24, L34‧‧‧Fourth lens

L15, L25, L35‧‧‧Fifth lens

L16, L26, L36‧‧‧Sixth lens

L17, L27, L37‧‧‧Seventh lens

L18, L28, L38‧‧‧Eighth lens

L19, L29, L39‧‧‧Ninth lens

L310‧‧‧Tenth lens

ST1, ST2, ST3‧‧‧Aperture

OA1, OA2, OA3‧‧‧Optical axis

OF1, OF2, OF3‧‧‧Filter

CG1, CG2, CG3‧‧‧Protection glass

IMA1, IMA2, IMA3: imaging surface

S11, S21, S31: the object side of the first lens

S12, S22, S32: the side of the first lens image

S13, S23, S33: the object side of the second lens

S14, S24, S34: the side of the second lens image

S15, S25, S35: third lens object side

S16, S26, S36: third lens image side

S17, S27, S37: the object side of the fourth lens

S18, S28, S38: the side of the fourth lens image

S19, S29, S39: aperture surface

S110, S210, S310: fifth lens object side

S111, S211, S311: the fifth lens image side (the sixth lens object side)

S112, S212, S312: the side of the sixth lens image

S113, S213, S314: seventh lens object side

S114, S214, S315: Side view of the seventh lens

S115, S215, S316: the object side of the eighth lens

S116, S216, S317: Side view of the eighth lens

S117, S217, S318: the object side of the ninth lens

S118, S218, S319: Ninth lens image side

S313: Tenth lens object side

S314: The image side of the tenth lens (the object side of the seventh lens)

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

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

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

Figure 2C is a Lateral Color diagram of the first embodiment of the imaging lens according to the present invention.

FIG. 3 is a schematic diagram of the lens configuration 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.

Fig. 4C is a lateral chromatic aberration diagram of the second embodiment of the imaging lens according to the present invention.

FIG. 5 is a schematic diagram of the lens configuration 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 lateral chromatic aberration diagram of the third embodiment of the imaging lens according to the present invention.

The present invention provides an imaging lens comprising: a first lens with negative refractive power, the first lens including a concave surface facing an image side; a second lens with negative refractive power; a third lens with positive refractive power; and a fourth lens with Positive refractive power; a fifth lens with positive refractive power; a sixth lens with negative refractive power; a seventh lens with refractive power; an eighth lens with refractive power; and a ninth lens is a meniscus lens, the ninth lens includes a The convex surface faces the object side and the concave surface faces the image side; the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens and the ninth lens are along the An optical axis is arranged in order from the object side to the image side.

Please refer to Table 1, Table 3, Table 4, Table 6 and Table 7 at the bottom, of which Table 1, Tables 3 and 6 are the relevant parameter tables of the lenses of the first embodiment to the third embodiment of the imaging lens according to the present invention. Tables 4 and 7 are the aspherical surfaces of the aspheric lenses in Tables 3 and 6, respectively. Table of relevant parameters of the surface.

Figures 1, 3, and 5 are respectively schematic diagrams of the lens configuration of the first, second, and third embodiments of the imaging lens of the present invention. The first lenses L11, L21, and L31 are biconcave lenses with negative refractive power and are made of glass. The object side surfaces S11, S21, S31 are concave surfaces, the image side surfaces S12, S22, S32 are concave surfaces, and the object side surfaces S11, S21, S31 and the image side surfaces S12, S22, S32 are spherical surfaces.

The second lenses L12, L22, and L32 are meniscus lenses with negative refractive power and are made of glass. The object side surfaces S13, S23, S33 are concave surfaces, the image side surfaces S14, S24, and S34 are convex surfaces, and the object side surfaces S13, S23, S33 and the image side surface S14, S24, S34 are all spherical surfaces.

The third lens L13, L23, and L33 are biconvex lenses with positive refractive power and are made of glass. The object side surfaces S15, S25, S35 are convex surfaces, and the image side surfaces S16, S26, S36 are convex surfaces. The object side surfaces S15, S25, S35 and The image sides S16, S26, and S36 are all spherical surfaces.

The fourth lenses L14, L24, and L34 are meniscus lenses with positive refractive power and are made of glass. The object side surfaces S17, S27, S37 are convex surfaces, the image side surfaces S18, S28, and S38 are concave surfaces, and the object side surfaces S17, S27, S27 are convex. S37 and the image side surface S18, S28, and S38 are all spherical surfaces.

The fifth lens L15, L25, and L35 are double convex lenses with positive refractive power and are made of glass. The object side surfaces S110, S210, S310 are convex surfaces, the image side surfaces S111, S211, and S311 are convex surfaces, and the object side surfaces S110, S210, S310 and S310 are convex. The image side surfaces S111, S211, and S311 are all spherical surfaces.

The sixth lens L16, L26, L36 is a double-concave lens with negative refractive power, made of glass Made of glass material, the object side surfaces S111, S211, S311 are concave surfaces, the image side surfaces S112, S212, S312 are concave surfaces, and the object side surfaces S111, S211, S311 and the image side surfaces S112, S212, S312 are spherical surfaces.

The seventh lenses L17, L27, and L37 have positive refractive power and are made of glass. The object side surfaces S113, S213, S314 are convex surfaces, and the object side surfaces S113, S213, S314 and the image side surfaces S114, S214, S315 are spherical surfaces.

The eighth lens L18, L28, L38 is made of glass material, the object side surfaces S115, S215, S316 are convex surfaces, and the object side surfaces S115, S215, S316 and the image side surfaces S116, S216, S317 are all spherical surfaces.

The ninth lens L19, L29, L39 is made of glass material, the object side surfaces S117, S217, S318 are convex surfaces, and the image side surfaces S118, S218, S319 are concave surfaces.

The fifth lenses L15, L25, and L35 are cemented with the sixth lenses L16, L26, and L36, respectively.

In addition, imaging lenses 1, 2, and 3 meet at least one of the following conditions: 0.2<f/TTL<0.35 (1)

7.5<T ₉ /T ₁ <14 (2)

1<f ₁₂₃₄ /f<2.1 (3)

-1.2<f ₇ /f ₈ <0.7 (4)

1.3<A/IH<2.1 (5)

Among them, f is the effective focal length of one of the imaging lenses 1, 2, and 3 in the _{first embodiment to the third embodiment, and f 7} is the one of the seventh lenses L17, L27, and L37 in the first embodiment to the third embodiment. An effective focal length, f ₈ is the effective focal length of one of the eighth lenses L18, L28, L38 in the _{first embodiment to the third embodiment, and f 1234} is the first lens L11, the first lens in the first embodiment to the third embodiment L21, L31, the second lens L12, L22, L32, the third lens L13, L23, L33 and the fourth lens L14, L24, L34 combined effective focal length, TTL is the first embodiment to the third embodiment, the first a lens L11, L21, L31 of the object side surface S11, S21, S31, respectively, to an imaging plane IMA1, IMA2, IMA3 the optical axis OA1, OA2, OA3 one of the pitch, T ₁ is the first embodiment to the third embodiment , the first lens L11, L21, L31 on the optical axis OA1, OA2, OA3 one of the thickness, T ₉ of the first embodiment to the third embodiment, the ninth lenses L19, L29, L39 on the optical axis OA1, OA2, OA3 is one thickness, A is one of the diameters of the apertures ST1, ST2, ST3 in the first embodiment to the third embodiment, and IH is the imaging lens 1, 2, and in the first embodiment to the third embodiment One of 3 maximum image height. The imaging lens 1, 2, and 3 can effectively reduce the aperture value, effectively improve the resolution, and effectively resist environmental temperature changes.

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 first lens L11, a second lens L12, a third lens L13, a fourth lens L14, and an object side to an image side in sequence along an optical axis OA1. An aperture ST1, a fifth lens L15, a sixth lens L16, a seventh lens L17, an eighth lens L18, a ninth lens L19, a filter OF1 and a protective glass CG1. When imaging, the light from the object side is finally imaged on an imaging surface IMA1. According to the first to twelfth paragraphs of the [embodiment], the seventh lens L17 is a biconvex lens, and its image side surface S114 is convex; the eighth lens L18 is a biconvex lens with positive refractive power, and its image side surface S116 is convex; the ninth lens L19 has negative refractive power, and its object side S117 and image side S118 are spherical surfaces; The object side surface S119 and the image side surface S120 of the filter OF1 are both flat surfaces; the object side surface S121 and the image side surface S122 of the protective glass CG1 are both flat surfaces.

Utilizing the above-mentioned lens, aperture ST1, and a design satisfying at least one of the conditions (1) to (5), the imaging lens 1 can effectively reduce the aperture value, effectively increase the resolution, and effectively resist environmental temperature changes.

Among them, if the value of the condition (1) f/TTL is less than 0.2, it is difficult to achieve the goal of miniaturization of the imaging lens. Therefore, the value of f/TTL must be at least greater than 0.2, so the best effect range is 0.2<f/TTL<0.35, and if this range is met, the best imaging lens miniaturization conditions are available.

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

Table 2 shows the relevant parameter values of the imaging lens 1 of the first embodiment and the calculated values of the corresponding conditions (1) to (5). From Table 2, it can be seen that the imaging lens 1 of the first embodiment can all satisfy the condition (1). ) To the requirements of condition (5).

In addition, the optical performance of the imaging lens 1 of the first embodiment can also meet the requirements, which can be seen from Figures 2A to 2C. Figure 2A shows a field curvature diagram of the imaging lens 1 of the first embodiment. Figure 2B shows a distortion diagram of the imaging lens 1 of the first embodiment. Figure 2C shows the lateral chromatic aberration diagram of the imaging lens 1 of the first embodiment.

It can be seen from FIG. 2A that the curvature of field of the imaging lens 1 of the first embodiment is between -0.015mm and 0.02mm.

It can be seen from FIG. 2B that the distortion of the imaging lens 1 of the first embodiment is between -9% and 0%.

It can be seen from FIG. 2C that the lateral chromatic aberration of the imaging lens 1 of the first embodiment is between -0.1 μm and 1.5 μm. .

It is obvious that the curvature of field, distortion, and lateral chromatic aberration of the imaging lens 1 of the first embodiment can be effectively corrected, thereby obtaining better optical performance.

Please refer to FIG. 3, which is a schematic diagram of the lens configuration of the second embodiment of the imaging lens according to the present invention. The imaging lens 2 includes a first lens L21, a second lens L22, a third lens L23, a fourth lens L24, and a first lens L21, a second lens L22, a third lens L23, and a An aperture ST2, a fifth lens L25, a sixth lens L26, a seventh lens L27, an eighth lens L28, a ninth lens L29, a filter OF2 and a protective glass CG2. When imaging, the light from the object side is finally imaged on an imaging surface IMA2. According to the first to twelfth paragraphs of [Embodiment], wherein: the seventh lens L27 is a biconvex lens, and its image side surface S214 is convex; the eighth lens L28 is a meniscus lens with negative refractive power, and its image side surface S216 is concave; Nine lens L29 has positive refractive power, its object side S217 and image side S218 are both aspherical surfaces; filter OF2, its object side S219 and image side S220 are both flat; protection glass CG2, its object side S221 and image side S222 are both flat.

Using the above-mentioned lens, aperture ST2, and a design satisfying at least one of the conditions (1) to (5), the imaging lens 2 can effectively reduce the aperture value, effectively increase the resolution, and effectively resist environmental temperature changes.

Among them, if the value of condition (3) f ₁₂₃₄ /f is less than 1, it will result in poor performance and low resolution of the imaging lens. Therefore, _{the value of f 1234} /f must be at least greater than 1, so the best effect range is 1<f ₁₂₃₄ /f<2.1. Meeting this range can improve the performance and resolution of the imaging lens.

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

The aspheric surface concavity z of the aspheric lens in Table 3 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

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

Table 4 is the relevant parameter table of the aspheric surface of the aspheric lens in Table 3, where k is the Conic Constant and A~D are the aspheric coefficients.

Table 5 shows the relevant parameter values of the imaging lens 2 of the second embodiment and the calculated values of the corresponding conditions (1) to (5). From Table 5, it can be seen that the imaging lens 2 of the second embodiment can all satisfy the condition (1). ) To the requirements of condition (5).

In addition, the optical performance of the imaging lens 2 of the second embodiment can also meet the requirements, which can be seen from Figures 4A to 4C. Figure 4A shows a field curvature diagram of the imaging lens 2 of the second embodiment. Figure 4B shows a distortion diagram of the imaging lens 2 of the second embodiment. Figure 4C shows the lateral chromatic aberration diagram of the imaging lens 2 of the second embodiment.

It can be seen from FIG. 4A that the curvature of field of the imaging lens 2 of the second embodiment is between -0.01 mm and 0.03 mm.

It can be seen from FIG. 4B that the distortion of the imaging lens 2 of the second embodiment is between -9% and 0%.

It can be seen from FIG. 4C that the lateral chromatic aberration of the imaging lens 2 of the second embodiment is between -0.5 μm and 1.1 μm.

It is obvious that the curvature of field, distortion, and lateral chromatic aberration of the imaging lens 2 of the second embodiment can be effectively corrected to obtain better optical performance.

Please refer to FIG. 5, which is a schematic diagram of the lens configuration of the third embodiment of the imaging lens according to the present invention. The imaging lens 3 includes a first lens L31, a second lens L32, a third lens L33, a fourth lens L34, and an object side to an image side in sequence along an optical axis OA3. An aperture ST3, a fifth lens L35, a sixth lens L36, a tenth lens L310, a seventh lens L37, an eighth lens L38, a ninth lens L39, a filter OF3, and a protective glass CG3 . When imaging, the light from the object side is finally imaged on an imaging surface IMA3. According to the first to twelfth paragraphs of the [embodiment], the tenth lens L310 is a meniscus lens with negative refractive power, the object side surface S313 is convex, the image side surface S314 is concave, and both the object side surface S313 and the image side surface S314 are spherical surfaces Surface; the seventh lens L37 is a meniscus lens with a concave image side surface S315; the tenth lens L310 is cemented with the seventh lens L37; the eighth lens L38 is a biconvex lens with positive refractive power, and its image side surface S317 is a convex surface; Nine lens L39 has positive refractive power, its object side S318 and image side S319 are both aspherical surfaces; filter OF3, its object side S320 and image side S321 are both flat; protective glass CG3, its object side S322 and image side S323 are both flat.

Using the above-mentioned lens, aperture ST3, and a design that meets at least one of the conditions (1) to (5), the imaging lens 3 can effectively reduce the aperture value, effectively increase the resolution, and effectively resist environmental temperature changes.

If the value of condition (4) f ₇ /f ₈ is greater than 0.7, the function of correcting aberration is not good. Therefore, _{the value of f 7} /f ₈ must be at least less than 0.7, so the best effect range is -1.2<f ₇ /f ₈ <0.7. If this range is met, it will have the best conditions for correcting aberrations and help reduce imaging lens assembly The sensitivity.

Table 6 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 6 is the same as the definition of the aspheric surface concavity z of the aspheric lens in Table 3 in the second embodiment, and will not be repeated here.

Table 7 is a table of related parameters of the aspheric surface of the aspheric lens in Table 6, where k is the Conic Constant, and A~D are the aspheric coefficients.

Table 8 shows the relevant parameter values of the imaging lens 3 of the third embodiment and the calculated values of the corresponding conditions (1) to (5). From Table 8, it can be seen that the imaging lens 3 of the third embodiment can all meet the condition (1). ) To the requirements of condition (5).

In addition, the optical performance of the imaging lens 3 of the third embodiment can also meet the requirements, which can be seen from Figures 6A to 6C. Fig. 6A shows a field curvature diagram of the imaging lens 3 of the third embodiment. Figure 6B shows a distortion diagram of the imaging lens 3 of the third embodiment. Figure 6C shows the lateral chromatic aberration diagram of the imaging lens 3 of the third embodiment.

It can be seen from FIG. 6A that the curvature of field of the imaging lens 3 of the third embodiment is between -0.015mm and 0.025mm.

It can be seen from FIG. 6B that the distortion of the imaging lens 3 of the third embodiment is between -9% and 0%.

It can be seen from FIG. 6C that the lateral chromatic aberration of the imaging lens 3 of the third embodiment is between 0 μm and 2.2 μm.

It is obvious that the curvature of field, distortion, and lateral chromatic aberration of the imaging lens 3 of the third embodiment can be effectively corrected, thereby obtaining better optical performance.

The conditions that the present invention meets are centered on 0.2<f/TTL<0.35, 1<f ₁₂₃₄ /f<2.1, _{-1.2<f 7} /f ₈ <0.7, and the values of the embodiments of the present invention also fall within the scope of other conditions . The condition 0.2<f/TTL<0.35 can help the imaging lens achieve miniaturization. Condition 1<f ₁₂₃₄ /f<2.1, the resolution can be significantly improved. The formula -1.2<f ₇ /f ₈ <0.7 can make the aberration correction function better.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone familiar with the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection of the present invention The scope shall be subject to those defined by the attached patent scope.

1‧‧‧Imaging lens

L11‧‧‧First lens

L12‧‧‧Second lens

L13‧‧‧Third lens

L14‧‧‧Fourth lens

L15‧‧‧Fifth lens

L16‧‧‧Sixth lens

L17‧‧‧Seventh lens

L18‧‧‧Eighth lens

L19‧‧‧Ninth lens

ST1‧‧‧Aperture

OA1‧‧‧Optical axis

OF1‧‧‧Filter

CG1‧‧‧Protection glass

IMA1‧‧‧imaging surface

S11‧‧‧Object side of the first lens

S12‧‧‧The side of the first lens image

S13‧‧‧Second lens object side

S14‧‧‧Second lens image side

S15‧‧‧Third lens object side

S16‧‧‧Third lens image side

S17‧‧‧Fourth lens object side

S18‧‧‧Fourth lens image side

S19‧‧‧Aperture surface

S110‧‧‧Fifth lens object side

S111‧‧‧Fifth lens image side (6th lens object side)

S112‧‧‧Sixth lens image side

S113‧‧‧Seventh lens object side

S114‧‧‧Seventh lens image side

S115‧‧‧The eighth lens object side

S116‧‧‧Eighth lens image side

S117‧‧‧Object side of ninth lens

S118‧‧‧Ninth lens image side

S119‧‧‧The side of the filter object

S120‧‧‧Filter image side

S121‧‧‧Protect the side of the glass object

S122‧‧‧Protect the side of the glass image

Claims (10)

An imaging lens comprising: a first lens having negative refractive power, the first lens including a concave surface facing an object side and a concave surface facing an image side; a second lens having negative refractive power; a third lens having positive refractive power; The fourth lens has positive refractive power; a fifth lens has positive refractive power; a sixth lens has negative refractive power; a seventh lens has refractive power; an eighth lens has refractive power; and a ninth lens is a meniscus lens. The nine lenses include a convex surface facing the object side and a concave surface facing the image side; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the first lens The seventh lens, the eighth lens and the ninth lens are arranged in order from the object side to the image side along an optical axis. According to the imaging lens of claim 1, wherein: the third lens includes a convex surface facing the image side; and the sixth lens includes a concave surface facing the object side. According to the imaging lens of claim 2, wherein: the second lens includes a concave surface facing the object side; and the fourth lens is a meniscus lens. The imaging lens according to any one of claims 1 to 3 of the scope of patent application, wherein: the second lens includes a convex surface facing the image side; the third lens includes a convex surface facing the object side; the first lens The four lenses include a convex surface facing the object side and a concave surface facing the image side; the fifth lens includes a convex surface facing the object side and another convex surface facing the image side; the sixth lens includes a concave surface facing the image side; the The seventh lens has a positive refractive power, the seventh lens includes a convex surface facing the object side and another convex surface facing the image side; the eighth lens has a positive refractive power, the eighth lens includes a convex surface facing the object side and another convex surface Toward the image side; and the ninth lens is a meniscus lens with negative refractive power, and the ninth lens includes a convex surface facing the object side and a concave surface facing the image side. The imaging lens described in any one of claims 1 to 3 of the scope of patent application, wherein: the second lens is a meniscus lens; the fourth lens is a meniscus lens; the seventh lens has a positive Refractive power, the seventh lens includes a convex surface facing the object side and another convex surface facing the image side; the eighth lens has a negative refractive power, the eighth lens includes a convex surface facing the object side and a concave surface facing the image side; and The ninth lens is a meniscus lens with positive refractive power, and the ninth lens includes a convex surface facing the object side and a concave surface facing the image side. Such as the imaging lens described in any one of claims 1 to 3 of the scope of patent application, in which: The seventh lens includes a concave surface facing the image side; the eighth lens has positive refractive power, the eighth lens includes a convex surface facing the object side and another convex surface facing the image side; and the ninth lens is a meniscus lens With positive refractive power, the ninth lens includes a convex surface facing the object side and a concave surface facing the image side; the imaging lens further includes a tenth lens disposed between the sixth lens and the seventh lens, the tenth lens Because the meniscus lens has negative refractive power, the tenth lens includes a convex surface facing the object side and a concave surface facing the image side. Such as the imaging lens described in any one of claims 1 to 3 in the scope of the patent application, wherein the imaging lens satisfies the following conditions: 1<f ₁₂₃₄ /f<2.1; -1.2 _{<f 7} /f ₈ <0.7; Where f is an effective focal length of the imaging lens, f _{1234 is a} combined effective focal length of one of the first lens, the second lens, the third lens, and the fourth lens, and f _{7 is} an effective focal length of the seventh lens. Focal length, f _{8 is} an effective focal length of the eighth lens. The imaging lens described in item 6 of the scope of patent application, wherein the fifth lens is cemented with the sixth lens or the seventh lens is cemented with the eighth lens. For the imaging lens described in item 4 of the scope of patent application, the imaging lens satisfies the following conditions: 0.2<f/TTL<0.35;7.5<T ₉ /T ₁ <14;1.3<A/IH<2.1; where f Is an effective focal length of the imaging lens, TTL is a distance from an object side of the first lens to an imaging surface on the optical axis, T ₁ is a thickness of the first lens on the optical axis, T ₉ Is a thickness of the ninth lens on the optical axis, A is a diameter of the aperture, and IH is a maximum image height of the imaging lens. For the imaging lens described in item 5 of the scope of patent application, the imaging lens satisfies the following conditions: 0.2<f/TTL<0.35;7.5<T ₉ /T ₁ <14;1.3<A/IH<2.1; where f Is an effective focal length of the imaging lens, TTL is a distance from an object side of the first lens to an imaging surface on the optical axis, T ₁ is a thickness of the first lens on the optical axis, T ₉ Is a thickness of the ninth lens on the optical axis, A is a diameter of the aperture, and IH is a maximum image height of the imaging lens.

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