TWI733628B - Lens assembly - Google Patents

Abstract

A lens assembly includes a first, second, third, fourth, fifth, sixth, seventh, eighth, and ninth lenses. The first lens is a biconvex lens with positive refractive power and includes a convex surface facing an object side and another convex surface facing an image side. The second lens is with negative refractive power and includes a concave surface facing the object side. The third lens is a biconvex lens with positive refractive power and includes a convex surface facing the object side and another convex surface facing the image side. The fifth lens is a biconcave lens with negative refractive power and includes a concave surface facing the object side and another concave surface facing the image side. The fourth, sixth, and ninth lenses are with positive refractive power. The seventh lens is with refractive power. The eighth lens is with negative refractive power. 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 (49)

The invention relates to an imaging lens.

The development trend of today’s imaging lenses, in addition to the continuous development toward miniaturization, with different application requirements, it also needs to have the ability of large aperture and high resolution. The conventional imaging lenses can no longer meet the needs of today, and there needs to be other An imaging lens with a new architecture can meet the needs of miniaturization, large aperture, and high resolution 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 aperture value, and a higher resolution, but still has good optical performance.

The present invention provides an imaging lens including 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. lens. The first lens has a double convex lens with positive refractive power, and includes a convex surface facing an object side and another convex surface facing an image side. The second lens has negative refractive power and includes a concave surface facing the object side. The third lens has a double convex lens with positive refractive power, and includes a convex surface facing the object side and another convex surface facing the image side. The fourth lens has positive refractive power. The fifth lens has a biconcave lens with negative refractive power, and includes a concave surface facing the object side and another concave surface facing the image side. The sixth lens has positive refractive power. The seventh lens has refractive power. The eighth lens has negative refractive power. The ninth lens has a positive flexion Light power. 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.

The imaging lens of the present invention may further include an aperture set between the second lens and the third lens, wherein the second lens may further include a convex surface, a concave surface or a flat surface facing the image side, and the fourth lens is a meniscus lens, And includes a concave surface facing the object side and a convex surface facing the image side. The sixth lens is a meniscus lens, and includes a convex surface facing the object side and a concave surface facing the image side. The seventh lens has a negative refractive power and is a meniscus lens, and It includes a concave surface facing the object side and a convex surface facing the image side. The eighth lens is a meniscus lens with a concave surface facing the object side and a convex surface facing the image side. The ninth lens is a biconvex lens with a convex surface facing the object side. And the other convex surface faces the image side.

The present invention provides another imaging lens including 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 first lens. Nine lenses. The first lens has positive refractive power and includes a convex surface facing an image side. The second lens has negative refractive power and includes a concave surface facing an object side and a convex surface, another concave surface or a flat surface facing the image side. The third lens has refractive power and includes a convex surface facing the image side. The fourth lens has a meniscus lens with positive refractive power, and includes a concave surface facing the object side and a convex surface facing the image side. The fifth lens has negative refractive power and includes a concave surface facing the image side. The sixth lens has positive refractive power and includes a concave surface facing the image side. The seventh lens has a meniscus lens with refractive power, and includes a concave surface facing the object side and a convex surface facing the image side. The eighth lens has a meniscus lens with negative refractive power, and includes a concave surface facing the object side and a convex surface facing the image side. The ninth lens has positive refractive power and includes a convex 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.

The imaging lens satisfies the following conditions: 2.5<|f ₄ /f ₇ |<7.7; where f ₄ is an effective focal length of the fourth lens, and f ₇ is an effective focal length of the seventh lens.

The imaging lens satisfies the following conditions: 4.3<|R ₄₁ /(f ₅ +f ₆ )|<10.1; where R ₄₁ is a curvature radius of an object side of the fourth lens, and f ₅ is an effective fifth lens Focal length, f ₆ is one of the effective focal lengths of the sixth lens.

The imaging lens satisfies the following conditions: 6<T ₆₇ /(CT ₄ -CT ₅ )<8; among them, T ₆₇ is the distance from one of the image side of the sixth lens to one of the object side of the seventh lens along the optical axis, CT ₄ is a thickness of the fourth lens along the optical axis, and CT ₅ is a thickness of the fifth lens along the optical axis.

The imaging lens satisfies any of the following conditions: 1<｜R ₈₂ /T ₆₇ ｜<12.2;1<｜f ₂ /(f ₃ -f ₅ )｜<2; where R ₈₂ is one of the image side faces of the eighth lens A radius of curvature, T ₆₇ is a distance from an image side of the sixth lens to an object side of the seventh lens along the optical axis, f ₂ is an effective focal length of the second lens, and f ₃ is one of the third lens Effective focal length, f ₅ is one of the effective focal lengths of the fifth lens.

The imaging lens satisfies any of the following conditions: 0.4<｜R ₈₂ /R ₁₁ ｜<6.5;1.3<｜R ₃₂ /R ₂₁ ｜<1.8; where R ₈₂ is the curvature radius of the image side of the eighth lens, R ₁₁ is a curvature radius of an object side surface of the first lens, R ₃₂ is a curvature radius of an image side surface of the third lens, and R ₂₁ is a curvature radius of an object side surface of the second lens.

The imaging lens satisfies any of the following conditions: 0.4<｜R ₇₂ /R ₆₂ ｜<6.3;0.8<R ₃₁ /R ₉₁ <1.13; where R ₃₁ is the radius of curvature of one of the object side surfaces of the third lens, R _{62 R 72} is a curvature radius of an image side surface of the sixth lens, R 72 is a curvature radius of an image side surface of the seventh lens, and R ₉₁ is a curvature radius of an object side surface of the ninth lens.

The imaging lens satisfies any of the following conditions: 1.8<｜R ₅₁ /R ₃₁ ｜<2.8;2.75<｜f ₇ +f ₈ ｜/f ₉ <3.22; where R ₃₁ is one of the object sides of the third lens The radius of curvature, R ₅₁ is the radius of curvature of an object side of the fifth lens, f ₇ is an effective focal length of the seventh lens, f ₈ is an effective focal length of the eighth lens, and f ₉ is an effective focal length of the ninth lens .

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: imaging lens

L11, L21, L31: the first lens

L12, L22, L32: second lens

ST1, ST2, ST3: Aperture

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

OF1, OF2, OF3: filter

CG1, CG2, CG3: protective glass

IMA1, IMA2, IMA3: imaging surface

OA1, OA2, OA3: Optical axis

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: aperture surface

S16, S26, S36: third lens object side

S17, S27, S37: third lens image side

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

S19, S29, S39: the side of the fourth lens image

S110, S210, S310: fifth lens object side

S111, S211, S311: the side of the fifth lens image

S112, S212, S312: sixth lens object side

S113, S213, S313: the side of the sixth lens image

S114, S214, S314: seventh lens object side

S115, S215, S315: Side view of the seventh lens

S116, S216, S316: the object side of the eighth lens

S117, S217, S317: Side view of the eighth lens

S118, S218, S318: the object side of the ninth lens

S119, S219, S319: Ninth lens image side

S120, S220, S320: the side of the filter object

S121, S221, S321: Filter image side

S122, S222, S322: Protect the side of the glass object

S123, S223, S323: Protect the side of the glass image

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 Longitudinal Aberration diagram of the first embodiment of the imaging lens according to the present invention.

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

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

Figure 2D is a Relative Illumination 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 longitudinal aberration diagram of the second embodiment of the imaging lens according to the present invention.

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

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

Fig. 4D is a relative contrast diagram of the second embodiment of the imaging lens according to the present invention.

Figure 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 picture.

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

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

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

Fig. 6D is a relative contrast 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 having positive refractive power, the first lens is a biconvex lens, and including a convex surface facing an object side and another convex surface facing an image side; a second lens having negative refractive power, The second lens includes a concave surface facing the object side; a third lens has a positive refractive power, the third lens is a biconvex lens, and includes a convex surface facing the object side and another convex surface facing the image side; a fourth lens has a positive refractive power; A fifth lens has negative refractive power, the fifth lens is a biconcave lens, and includes a concave surface facing the object side and another concave surface facing the image side; a sixth lens has positive refractive power; a seventh lens has refractive power; an eighth lens Has negative refractive power; and a ninth lens has positive refractive power; wherein 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 They are arranged in order from the object side to the image side along an optical axis.

The present invention provides another imaging lens, including: a first lens having a positive refractive power, the first lens including a convex surface facing an image side; a second lens having a negative refractive power, the second lens including a concave surface facing an object side and A convex surface, another concave surface, or a flat surface facing the image side; a third lens having refractive power, the third lens including a convex surface facing the image side; a fourth lens having positive refractive power, the fourth lens is a meniscus lens, and It includes a concave surface facing the object side and a convex surface facing the image side; a fifth lens has negative refractive power and includes a concave surface facing the image side; a sixth lens The lens has positive refractive power and includes a concave surface facing the image side; a seventh lens has refractive power, the seventh lens is a meniscus lens, and includes a concave surface facing the object side and a convex surface facing the image side; an eighth lens has a negative Refractive power, the eighth lens is a meniscus lens, and includes a concave surface facing the object side and a convex surface facing the image side; and a ninth lens with positive refractive power, the ninth lens includes a convex surface facing the image side; wherein 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.

Please refer to Table 1, Table 3, and Table 5 below. Table 1, Table 3, and Table 5 are related parameter tables of each lens of the first embodiment to the third embodiment of the imaging lens according to the present invention.

Figures 1, 3, and 5 are respectively the lens configuration and optical path diagrams of the first, second, and third embodiments of the imaging lens of the present invention. The first lenses L11, L21, L31 are double convex lenses with positive refractive power and are made of glass. The object side surfaces S11, S21, S31 are convex surfaces, the image side surfaces S12, S22, and S32 are convex 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 have negative refractive power and are made of glass material. The object side surfaces S13, S23, S33 are concave surfaces, and the object side surfaces S13, S23, S33 are spherical surfaces.

The third lens L13, L23, L33 is a double convex lens with positive refractive power, made of glass material, its object side surface S16, S26, S36 is convex surface, the image side surface S17, S27, S37 is convex surface, the object side surface S16, S26, S36 and The image sides S17, S27, and S37 are all spherical surfaces.

The fourth lens L14, L24, and L34 are meniscus lenses with positive refractive power and are made of glass. The object side surfaces S18, S28, and S38 are concave, like the side surfaces S19, S29, and S39. It is a convex surface, and the object side surfaces S18, S28, S38 and the image side surfaces S19, S29, S39 are all spherical surfaces.

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

The sixth lens L16, L26, and L36 are meniscus lenses with positive refractive power and are made of glass. The object side surfaces S112, S212, S312 are convex surfaces, the image side surfaces S113, S213, and S313 are concave surfaces, and the object side surfaces S112, S212, S312 and the image side surface S113, S213, and S313 are all spherical surfaces.

The seventh lenses L17, L27, and L37 are meniscus lenses with negative refractive power and are made of glass. The object side surfaces S114, S214, and S314 are concave surfaces, the image side surfaces S115, S215, and S315 are convex surfaces, and the object side surfaces S114, S214, S314 and the image side surface S115, S215, and S315 are all spherical surfaces.

The eighth lens L18, L28, and L38 are meniscus lenses with negative refractive power and are made of glass. The object side surfaces S116, S216, S316 are concave surfaces, the image side surfaces S117, S217, and S317 are convex surfaces, and the object side surfaces S116, S216, S316 and the image side surface S117, S217, and S317 are all spherical surfaces.

The ninth lens L19, L29, and L39 are biconvex lenses with positive refractive power and are made of glass. The object side surfaces S118, S218, and S318 are convex surfaces, and the image side surfaces S119, S219, and S319 are convex surfaces. The object side surfaces S118, S218, S318 and The image sides S119, S219, and S319 are all spherical surfaces.

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

2.5<｜f ₄ /f ₇ ｜<7.7; (1)

4.3<｜R ₄₁ /(f ₅ +f ₆ )｜<10.1; (2)

6<T ₆₇ /(CT ₄ -CT ₅ )<8; (3)

1<｜R ₈₂ /T ₆₇ ｜<12.2; (4)

0.4<｜R ₈₂ /R ₁₁ ｜<6.5; (5)

0.4<｜R ₇₂ /R ₆₂ ｜<6.3; (6)

0.8<R ₃₁ /R ₉₁ <1.13; (7)

1.8<｜R ₅₁ /R ₃₁ ｜<2.8; (8)

2.75<｜f ₇ +f ₈ ｜/f ₉ <3.22; (9)

1<｜f ₂ /(f ₃ -f ₅ )｜<2; (10)

1.3<｜R ₃₂ /R ₂₁ ｜<1.8; (11)

Among them, f ₂ is the effective focal length of one of the second lenses L12, L22, and L32 in the _{first embodiment to the third embodiment, and f 3} is the third lens L13, L23, and L23 in the first embodiment to the third embodiment. L33 is an effective focal length, f ₄ is an effective focal length of the fourth lens L14, L24, L34 in the _{first embodiment to the third embodiment, f 5} is the fifth lens in the first embodiment to the third embodiment One of the effective focal lengths of L15, L25, L35, f ₆ is one of the effective focal lengths of the sixth lens L16, L26, L36 in the _{first embodiment to the third embodiment, f 7} is the effective focal length of the first embodiment to the third embodiment , One of the effective focal lengths of the seventh lens L17, L27, L37, f ₈ is one of the effective focal lengths of the eighth lens L18, L28, L38 in the first embodiment to the third embodiment, and f ₉ is one of the effective focal lengths of the first embodiment to the third embodiment. In the three embodiments, the effective focal length of one of the ninth lenses L19, L29, L39, and R ₁₁ is one of the object sides S11, S21, S31 of the first lenses L11, L21, L31 in the first to third embodiments The radius of curvature, R ₂₁ is the radius of curvature of the object sides S13, S23, S33 of the second lens L12, L22, L32 in the _{first to third embodiments, and R 31} is the first to third embodiments In the third lens L13, L23, L33, the object side surface S16, S26, S36 is one of the curvature radius, R ₃₂ is the first embodiment to the third embodiment, the third lens L13, L23, L33 of the image side surface S17, S27, S37 is a radius of curvature, R ₄₁ is a radius of curvature of the object side surfaces S18, S28, S38 of the fourth lens L14, L24, L34 in the first to third embodiments, and R ₅₁ is the first embodiment In the third embodiment, the fifth lens L15, L25, L35 has a curvature radius of one of the object sides S110, S210, S310, and R ₆₂ is the sixth lens L16, L26, L36 in the first to third embodiments. One of the curvature radius of the image side surface S113, S213, S313, R ₇₂ is the curvature radius of the image side surface S115, S215, S315 of the seventh lens L17, L27, L37 in the first embodiment to the third embodiment, R ₈₂ Is one of the curvature radii of the image side surfaces S117, S217, S317 of the eighth lens L18, L28, and L38 in the _{first to third embodiments, and R 91} is the ninth lens in the first to third embodiments One of the curvature radiuses of the object side surfaces S118, S218, and S318 of L19, L29, and L39, T ₆₇ is the image side surface S113, S213, S313 of the sixth lens L16, L26, L36 to the object side surface S114 of the seventh lens L17, L27, L37 , S214, S314 are along one of the optical axes OA1, OA2, OA3, and CT ₄ is the fourth lens L14, L24, L34 along the optical axis OA1, A thickness of OA2, OA3, CT ₅ is a thickness of the fifth lens L15, L25, L35 along the optical axis OA1, OA2, OA3. The imaging lenses 1, 2, and 3 can effectively improve the resolution, effectively correct aberrations, and effectively correct chromatic aberrations.

When the condition (1) is met: 2.5<|f ₄ /f ₇ |<7.7, sufficient refractive power of the imaging lens can be provided to control the field of view and help correct aberrations.

When the condition (2) is satisfied: 4.3<|R ₄₁ /(f ₅ +f ₆ )|<10.1, the aberration can be corrected and the resolution can be improved.

When the condition (3) is satisfied: 6<T ₆₇ /(CT ₄ -CT ₅ )<8, the lens thickness and lens interval can be appropriately adjusted to correct the off-axis aberration.

When the condition (4) is satisfied: 1<|R ₈₂ /T ₆₇ |<12.2, it is possible to have appropriate lens thickness and lens spacing to correct off-axis aberrations.

When the condition (5) is satisfied: 0.4<|R ₈₂ /R ₁₁ |<6.5, an appropriate lens thickness and lens interval can be provided to correct off-axis aberrations.

When the condition (6) is satisfied: 0.4<|R ₇₂ /R ₆₂ |<6.3, it can have proper lens thickness and lens interval to correct the off-axis aberration.

When the condition (7) is satisfied: 0.8<R ₃₁ /R ₉₁ <1.13, it can have proper lens thickness and lens interval to correct the off-axis aberration.

When the condition (8) is satisfied: 1.8<|R ₅₁ /R ₃₁ |<2.8, the field of view can be controlled and the aberration can be corrected.

When the condition (9) is satisfied: 2.75<|f ₇ +f ₈ |/f ₉ <3.22, the field of view can be controlled and aberrations can be corrected.

When the condition (10) is satisfied: 1<|f ₂ /(f ₃ -f ₅ )|<2, the aberration can be corrected and the resolution can be improved.

When the condition (11) is satisfied: 1.3<|R ₃₂ /R ₂₁ |<1.8, the aberration can be corrected and the resolution can be improved.

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 first lens L11, a second lens L12, an aperture ST1, a third lens L13, and a second lens L11, a second lens L12, a first lens L11, a third lens L13, and a second lens L11 in order from an object side to an image side along an optical axis OA1. Four lenses L14, 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 [Implementation Mode], in which:

The second lens L12 is a meniscus lens, the image side surface S14 is a convex surface, and the image side surface S14 is a spherical surface;

The object side S120 and the image side S121 of the filter OF1 are both flat surfaces;

The protective glass CG1, the object side S122 and the image side S123 are both flat surfaces;

Utilizing the above-mentioned lens, aperture ST1, and a design satisfying at least one of the conditions (1) to (11), the imaging lens 1 can effectively improve the resolution, effectively correct aberrations, and effectively correct chromatic aberrations.

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 (11). 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 (11).

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 longitudinal aberration of the imaging lens 1 of the first embodiment is between -0.06 mm and 0.03 mm. It can be seen from FIG. 2B that the curvature of field of the imaging lens 1 of the first embodiment is between -0.03mm and 0.04mm. It can be seen from FIG. 2C that the distortion of the imaging lens 1 of the first embodiment is between 0% and 0.2%. It can be seen from Fig. 2D that the relative illuminance of the imaging lens 1 of the first embodiment is between 0.98 and 1.0.

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

Please refer to Fig. 3, the imaging lens 2 includes a first lens L21, a second lens L22, an aperture ST2, a third lens L23, and a second lens in order from an object side to an image side along an optical axis OA2. Four lenses L24, 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 [Implementation Mode], in which:

The second lens L22 is a biconcave lens, and its image side surface S24 is concave. S24 is a spherical surface;

The object side S220 and the image side S221 of the filter OF2 are both flat surfaces;

The protective glass CG2 has a flat surface on the object side S222 and the image side S223;

Using the above-mentioned lens, aperture ST2, and a design satisfying at least one of the conditions (1) to (11), the imaging lens 2 can effectively improve the resolution, effectively correct aberrations, and effectively correct chromatic aberrations.

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

Table 4 shows the relevant parameter values of the imaging lens 2 of the second embodiment and the calculated values of the corresponding conditions (1) to (11). From Table 4, it can be seen that the imaging lens 2 of the second embodiment can all satisfy the condition (1). ) To the requirements of condition (11).

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 longitudinal aberration of the imaging lens 2 of the second embodiment is between -0.03mm and 0.02mm. It can be seen from FIG. 4B that the curvature of field of the imaging lens 2 of the second embodiment is between -0.02 mm and 0.02 mm. It can be seen from FIG. 4C that the distortion of the imaging lens 2 of the second embodiment is between 0% and 0.1%. It can be seen from FIG. 4D that the relative illuminance of the imaging lens 2 of the second embodiment is between 0.99 and 1.0.

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

Referring to FIG. 5, the imaging lens 3 includes a first lens L31, a second lens L32, an aperture ST3, a third lens L33, and a first lens L31 in sequence from an object side to an image side along an optical axis OA3. Four lenses L34, a fifth lens L35, a sixth lens L36, 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 [Implementation Mode], in which:

The second lens L32 is a plano-concave lens, and its image side surface S34 is a flat surface;

The object side S320 and the image side S321 of the filter OF3 are both flat surfaces;

The protective glass CG3, the object side S322 and the image side S323 are both flat;

Utilizing the above-mentioned lens, the aperture ST3 and the design satisfying at least one of the conditions (1) to (11), the imaging lens 3 can effectively improve the resolution, effectively correct aberrations, and effectively correct chromatic aberrations.

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

Table 6 shows the relevant parameter values and corresponding values of the imaging lens 3 of the third embodiment The calculated values of condition (1) to condition (11) can be seen from Table 6 that the imaging lens 3 of the third embodiment can all meet the requirements of condition (1) to condition (11).

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 longitudinal aberration of the imaging lens 3 of the third embodiment is between -0.04mm and 0.03mm. It can be seen from FIG. 6B that the curvature of field of the imaging lens 3 of the third embodiment is between -0.03mm and 0.03mm. It can be seen from FIG. 6C that the distortion of the imaging lens 3 of the third embodiment is between 0% and 0.2%. It can be seen from FIG. 6D that the relative illuminance of the imaging lens 3 of the third embodiment is between 0.99 and 1.0.

It is obvious that the longitudinal aberration, curvature of field, and distortion of the imaging lens 3 of the third embodiment can be effectively corrected, and the relative illuminance 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

L11: The first lens

L12: second lens

ST1: Aperture

L13: third lens

L14: Fourth lens

L15: fifth lens

L16: sixth lens

L17: seventh lens

L18: Eighth lens

L19: Ninth lens

OF1: filter

CG1: Protective glass

IMA1: imaging surface

OA1: Optical axis

S11: Object side of the first lens

S12: The side of the first lens image

S13: Object side of the second lens

S14: Second lens image side

S15: Aperture surface

S16: Third lens object side

S17: The third lens image side

S18: Object side of the fourth lens

S19: Fourth lens image side

S110: fifth lens object side

S111: Side view of the fifth lens

S112: sixth lens object side

S113: Sixth lens image side

S114: seventh lens object side

S115: Side view of seventh lens

S116: Eighth lens object side

S117: Side view of the eighth lens

S118: Object side of the ninth lens

S119: Ninth lens image side

S120: Side of the filter object

S121: Filter image side

S122: Protect the side of the glass object

S123: Protect the side of the glass image

Claims (10)

An imaging lens, including: A first lens has positive refractive power, the first lens is a biconvex lens, and includes a convex surface facing One object side and the other convex surface face one image side; A second lens having negative refractive power, the second lens including a concave surface facing the object side; A third lens with positive refractive power, the third lens is a biconvex lens, and includes a convex surface facing the object side and another convex surface facing the image side; A fourth lens has positive refractive power; A fifth lens with negative refractive power, the fifth lens is a biconcave lens, and includes a concave surface facing the object side and another concave surface facing the image side; A sixth lens has positive refractive power; A seventh lens has refractive power; An eighth lens has negative refractive power; and A ninth lens has positive refractive power; 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 an optical axis Arrange in order from the object side to the image side. The imaging lens described in item 1 of the scope of patent application further includes an aperture set between the second lens and the third lens, wherein: The second lens further includes a convex surface, a concave surface, or a flat surface facing the image side; The fourth lens is a meniscus lens and includes a concave surface facing the object side and a convex surface facing the image side; The sixth lens is a meniscus lens and includes a convex surface facing the object side and a concave surface facing the image side; The seventh lens has a meniscus lens with negative refractive power, and includes a concave surface facing the object side and a convex surface facing the image side; The eighth lens is a meniscus lens and includes a concave surface facing the object side and a convex surface facing the image side; and The ninth lens is a biconvex lens and includes a convex surface facing the object side and another convex surface facing the image side. An imaging lens, including: A first lens having positive refractive power, the first lens including a convex surface facing an image side; A second lens with negative refractive power, the second lens including a concave surface facing an object side and a convex surface, another concave surface or a flat surface facing the image side; A third lens having refractive power, and the third lens includes a convex surface facing the image side; A fourth lens with positive refractive power, the fourth lens is a meniscus lens, and includes a concave surface facing the object side and a convex surface facing the image side; A fifth lens having negative refractive power, and the fifth lens includes a concave surface facing the image side; A sixth lens having positive refractive power, and the sixth lens includes a concave surface facing the image side; A seventh lens with refractive power, the seventh lens is a meniscus lens, and includes a concave surface facing the object side and a convex surface facing the image side; An eighth lens has negative refractive power, the eighth lens is a meniscus lens and includes a concave surface facing the object side and a convex surface facing the image side; and A ninth lens with positive refractive power, and the ninth lens includes a convex 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 along an optical axis Arrange in order from the object side to the image side. Such as the imaging lens described in any one of claims 1 to 3 of the scope of patent application, wherein the imaging lens satisfies the following conditions: 2.5<｜f ₄ /f ₇ ｜<7.7; Wherein, f _{4 is} an effective focal length of the fourth lens, and f _{7 is} an effective focal length of the seventh lens. Such as the imaging lens described in any one of claims 1 to 3 of the scope of patent application, wherein the imaging lens satisfies the following conditions: 4.3<｜R ₄₁ /(f ₅ +f ₆ )｜<10.1; Wherein, R _{41 is a} radius of curvature of an object side surface of the fourth lens, f _{5 is} an effective focal length of the fifth lens, and f _{6 is} an effective focal length of the sixth lens. Such as the imaging lens described in any one of claims 1 to 3 of the scope of patent application, wherein the imaging lens satisfies the following conditions: 6<T ₆₇ /(CT ₄ -CT ₅ )<8; Wherein, T _{67 is a} distance from an image side of the sixth lens to an object side of the seventh lens along the optical axis, CT ₄ is a thickness of the fourth lens along the optical axis, and CT ₅ is The fifth lens has a thickness along the optical axis. Such as the imaging lens described in any one of claims 1 to 3 of the scope of patent application, wherein the imaging lens satisfies any of the following conditions: 1<｜R ₈₂ /T ₆₇ ｜<12.2; 1<｜f ₂ /(f ₃ -f ₅ )｜<2; Where R _{82 is a} radius of curvature of an image side surface of the eighth lens, T _{67 is a} distance along the optical axis from an image side surface of the sixth lens to an object side surface of the seventh lens, and f ₂ is An effective focal length of the second lens, f _{3 is} an effective focal length of the third lens, and f _{5 is} an effective focal length of the fifth lens. Such as the imaging lens described in any one of claims 1 to 3 of the scope of patent application, wherein the imaging lens satisfies any of the following conditions: 0.4<｜R ₈₂ /R ₁₁ ｜<6.5; 1.3<｜R ₃₂ /R ₂₁ ｜<1.8; Wherein, R _{82 is a} curvature radius of an image side surface of the eighth lens, R _{11 is a} curvature radius of an object side surface of the first lens, and R _{32 is a} curvature radius of an image side surface of the third lens. R _{21 is a} curvature radius of an object side surface of the second lens. Such as the imaging lens described in any one of claims 1 to 3 of the scope of patent application, wherein the imaging lens satisfies any of the following conditions: 0.4<｜R ₇₂ /R ₆₂ ｜<6.3; 0.8<R ₃₁ /R ₉₁ <1.13; Where R _{31 is a} curvature radius of an object side surface of the third lens, R _{62 is a} curvature radius of an image side surface of the sixth lens, and R _{72 is a} curvature radius of an image side surface of the seventh lens. R _{91 is a} radius of curvature of an object side surface of the ninth lens. Such as the imaging lens described in any one of claims 1 to 3 of the scope of patent application, wherein the imaging lens satisfies any of the following conditions: 1.8<｜R ₅₁ /R ₃₁ ｜<2.8; 2.75<｜f ₇ +f ₈ ｜/f ₉ <3.22; Wherein, R _{31 is a} radius of curvature of an object side of the third lens, R _{51 is a} radius of curvature of an object side of the fifth lens, f _{7 is} an effective focal length of the seventh lens, and f _{8 is} the One of the effective focal lengths of the eighth lens, f _{9 is} one of the effective focal lengths of the ninth lens.

Images