TWI559030B - Lens assembly - Google Patents

Description

Imaging lens

The present invention relates to an imaging lens.

The continuous development of digital cameras and hands to high-definition and lightweight, so that the demand for miniaturization and high-resolution lens modules has increased. The lens module composed of the conventional five-lens lens can not meet the needs of today, and another lens module with a new architecture is needed to meet the requirements of miniaturization and high resolution at the same time.

In view of this, the main object of the present invention is to provide an imaging lens which has a short total lens length and a large viewing angle, but still has good optical performance, and the lens resolution can also meet the requirements.

The imaging lens of the present invention sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the object side to the image side along the optical axis. The first lens has a positive refractive power and includes a convex surface that faces the object side. The second lens has a refractive power. The third lens has a refractive power. The fourth lens has a refractive power. The fifth lens has a positive refractive power. The sixth lens has a positive refractive power. The imaging lens satisfies the following conditions: 0.69 f/TTL 0.85, where f is the effective focal length of the imaging lens, and TTL is the distance from the object side of the first lens to an imaging surface on the optical axis.

The fourth lens has a negative refractive power of the meniscus lens, and the concave surface of the fourth lens faces the image side convex surface toward the image side.

The imaging lens satisfies the following conditions: -1.8 f ₄ /f -1.3; wherein f ₄ is the effective focal length of the fourth lens, and f is the effective focal length of the imaging lens.

The sixth lens satisfies the following conditions: 3 f ₆ /f 5; wherein f ₆ is the effective focal length of the sixth lens, and f is the effective focal length of the imaging lens.

The first lens satisfies the following conditions: -1.5 (R ₁₁ -R ₁₂ )/(R ₁₁ +R ₁₂ ) -0.5; wherein R ₁₁ is the radius of curvature of the object side surface of the first lens, and R ₁₂ is the radius of curvature of the image side surface of the first lens.

Wherein the second lens satisfies the following condition: 0.2 (R ₂₁ -R ₂₂ )/(R ₂₁ +R ₂₂ ) 0.4; wherein R ₂₁ is a radius of curvature of an object side surface of the second lens, and R ₂₂ is a curvature radius of an image side surface of the second lens.

The imaging lens satisfies the following conditions: 5 f ₅ /f 100; wherein f ₅ is the effective focal length of the fifth lens, and f is the effective focal length of the imaging lens.

Wherein the third lens satisfies the following condition: -100 (R ₃₁ -R ₃₂ )/(R ₃₁ +R ₃₂ ) 2; wherein R ₃₁ is a radius of curvature of an object side surface of the third lens, and R ₃₂ is a curvature radius of an image side surface of the third lens.

The second lens has a convex-concave lens having a negative refractive power, and the convex surface of the second lens faces the object-side concave surface toward the image side.

The third lens has a positive refractive power and includes a convex surface that faces the image side.

The sixth lens is a convex-concave lens, and the convex surface of the sixth lens faces the object side concave surface toward the image side.

At least one of the object side surface and the image side surface of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens is an aspherical surface.

The imaging lens of the present invention may further include an aperture disposed between the object side and the first lens.

The fourth lens has a positive refractive power of the meniscus lens, and the concave surface of the fourth lens faces the image side convex surface toward the image side.

The imaging lens satisfies the following conditions: 5 f ₄ /f 30; wherein f ₄ is the effective focal length of the fourth lens, and f is the effective focal length of the imaging lens.

The imaging lens of the present invention sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from the object side to the image side along the optical axis. The first lens has a positive refractive power and includes a convex surface that faces the object side. The second lens has a convex-concave lens having a negative refractive power, and the convex surface of the second lens faces the object side concave surface toward the image side. The third lens has a positive refractive power and includes a convex surface that faces the image side. The fourth lens is a meniscus lens, and the concave surface of the fourth lens faces the image side convex surface toward the image side. The fifth lens has a positive refractive power of the meniscus lens, and the concave surface of the fifth lens faces the image side convex surface toward the image side. The sixth lens has a positive refractive power, and the convex surface of the sixth lens faces the object side concave surface toward the image side. The imaging lens satisfies the following conditions: 0.69 f/TTL 0.85, 11.5 f ₅ /f 26.5,0 (R ₃₁ -R ₃₂ )/(R ₃₁ +R ₃₂ ) 1, where f is the effective focal length of the imaging lens, TTL is the distance from the object side of the first lens to an imaging surface on the optical axis, f ₅ is the effective focal length of the fifth lens, and R ₃₁ is the object side of the third lens The radius of curvature, R ₃₂ is the radius of curvature of the image side of the third lens.

The above described objects, features, and advantages of the invention will be apparent from the description and appended claims

1, 2, 3, 4, 5, 6, 7‧ ‧ imaging lenses

L11, L21, L31, L41‧‧‧ first lens

L51, L61, L71‧‧‧ first lens

L12, L22, L32, L42‧‧‧ second lens

L52, L62, L72‧‧‧ second lens

L13, L23, L33, L43‧‧‧ third lens

L53, L63, L73‧‧‧ third lens

L14, L24, L34, L44‧‧‧ fourth lens

L54, L64, L74‧‧‧ fourth lens

L15, L25, L35, L45‧‧‧ fifth lens

L55, L65, L75‧‧‧ fifth lens

L16, L26, L36, L46‧‧‧ sixth lens

L56, L66, L76‧‧‧ sixth lens

ST1, ST2, ST3, ST4‧‧ ‧ aperture

ST5, ST6, ST7‧‧ ‧ aperture

OF1, OF2, OF3, OF4‧‧‧ Filters

OF5, OF6, OF7‧‧‧ Filters

IMA1, IMA2, IMA3, IMA4‧‧‧ imaging surface

IMA5, IMA6, IMA7‧‧‧ imaging surface

OA1, OA2, OA3, OA4‧‧‧ optical axis

OA5, OA6, OA7‧‧‧ optical axis

S11, S12, S13, S14, S15, S16, S17‧‧

S18, S19, S110, S111, S112, S113‧‧‧

S114, S115‧‧‧ face

S21, S22, S23, S24, S25, S26, S27‧‧

S28, S29, S210, S211, S212, S213‧‧‧

S214, S215‧‧‧

S31, S32, S33, S34, S35, S36, S37‧‧

S38, S39, S310, S311, S312, S313‧‧

S314, S315‧‧‧

S41, S42, S43, S44, S45, S46, S47‧‧

S48, S49, S410, S411, S412, S413‧‧

S414, S415‧‧‧

S51, S52, S53, S54, S55, S56, S57‧‧

S58, S59, S510, S511, S512, S513‧‧‧

S514, S515‧‧‧

S61, S62, S63, S64, S65, S66, S67‧‧

S68, S69, S610, S611, S612, S613‧‧

S614, S615‧‧‧

S71, S72, S73, S74, S75, S76, S77‧‧

S78, S79, S710, S711, S712, S713‧‧‧

S714, S715‧‧‧

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

Fig. 2A is a longitudinal spherical aberration diagram of the imaging lens of Fig. 1.

Fig. 2B is an astigmatic field curvature diagram of the imaging lens of Fig. 1.

Fig. 2C is a distortion diagram of the imaging lens of Fig. 1.

Fig. 3 is a schematic view showing a lens configuration and an optical path of a second embodiment of the imaging lens according to the present invention.

Fig. 4A is a longitudinal spherical aberration diagram of the imaging lens of Fig. 3.

Fig. 4B is an astigmatic field curvature diagram of the imaging lens of Fig. 3.

Fig. 4C is a distortion diagram of the imaging lens of Fig. 3.

Fig. 5 is a view showing a lens configuration and an optical path of a third embodiment of the imaging lens according to the present invention.

Fig. 6A is a longitudinal spherical aberration diagram of the imaging lens of Fig. 5.

Fig. 6B is an astigmatic field curvature diagram of the imaging lens of Fig. 5.

Fig. 6C is a distortion diagram of the imaging lens of Fig. 5.

Fig. 7 is a view showing a lens configuration and an optical path of a fourth embodiment of the imaging lens according to the present invention.

Fig. 8A is a longitudinal spherical aberration diagram of the imaging lens of Fig. 7.

Fig. 8B is an astigmatic field curvature diagram of the imaging lens of Fig. 7.

Fig. 8C is a distortion diagram of the imaging lens of Fig. 7.

Fig. 9 is a view showing a lens configuration and an optical path of a fifth embodiment of the imaging lens according to the present invention.

Fig. 10A is a longitudinal spherical aberration diagram of the imaging lens of Fig. 9.

Fig. 10B is an astigmatic field curvature diagram of the imaging lens of Fig. 9.

Fig. 10C is a distortion diagram of the imaging lens of Fig. 9.

Fig. 11 is a view showing a lens configuration and an optical path of a sixth embodiment of the imaging lens according to the present invention.

Fig. 12A is a longitudinal spherical aberration diagram of the imaging lens of Fig. 11.

Fig. 12B is an astigmatic field curvature diagram of the imaging lens of Fig. 11.

Fig. 12C is a distortion diagram of the imaging lens of Fig. 11.

Figure 13 is a schematic view showing a lens configuration and an optical path of a seventh embodiment of the imaging lens according to the present invention.

Fig. 14A is a longitudinal spherical aberration diagram of the imaging lens of Fig. 13.

Fig. 14B is an astigmatic field curvature diagram of the imaging lens of Fig. 13.

Fig. 14C is a distortion diagram of the imaging lens of Fig. 13.

Please refer to FIG. 1. FIG. 1 is a schematic view showing a lens configuration and an optical path of a first embodiment of an imaging lens according to the present invention. The imaging lens 1 sequentially includes an aperture ST1, a first lens L11, a second lens L12, a third lens L13, a fourth lens L14, and a fifth lens L15 from the object side to the image side along the optical axis OA1. a sixth lens L16 and a filter OF1. At the time of imaging, the light from the object side is finally imaged on an image plane IMA1. The first lens L11 has a positive refractive power made of a plastic material, and the object side surface S12 has a convex image side surface S13 as a convex surface, and the object side surface S12 and the image side surface S13 are aspherical surfaces. The second lens L12 has a negative refractive power made of a plastic material, and the object side surface S14 has a convex image side surface S15 which is a concave surface, and the object side surface S14 and the image side surface S15 are aspherical surfaces. The third lens L13 has a positive refractive power made of a plastic material, and the object side surface S16 has a convex image side surface S17 as a convex surface, and the object side surface S16 and the image side surface S17 are aspherical surfaces. The fourth lens L14 has a negative refractive power made of a plastic material, and the object side surface S18 has a concave image side surface S19 as a convex surface, and the object side surface S18 and the image side surface S19 are aspherical surfaces. The fifth lens L15 has a positive refractive power made of a plastic material, and the object side surface S110 has a concave image side surface S111 as a convex surface, and the object side surface S110 and the image side surface S111 are aspherical surfaces. The sixth lens L16 has a positive refractive power made of a plastic material, and the object side surface S112 has a convex surface side surface S113 which is a concave surface, and the object side surface S112 and the image side surface S113 are aspherical surfaces. The filter OF1 has a flat surface S114 and an image side surface S115.

In addition, in order to maintain good optical performance of the imaging lens of the present invention, the imaging lens 1 of the first embodiment is required to satisfy the following seven conditions:

Wherein f1 ₄ is the effective focal length of the fourth lens L14, f1 is the effective focal length of the imaging lens 1, f1 ₅ is the effective focal length of the fifth lens L15, and TTL1 is the object side S12 of the first lens L11 to the imaging plane IMA1 on the optical axis The distance on the OA1, R1 ₁₁ is the radius of curvature of the object side surface S12 of the first lens L11, R1 ₁₂ is the radius of curvature of the image side surface S13 of the first lens L11, and R1 ₂₁ is the radius of curvature of the object side surface S14 of the second lens L12. R1 ₂₂ is the second curvature radius of the lens L12 of the side surface S15, R1 ₃₁ to the object side of the third lens L13 S16 of radius of curvature, R1 ₃₂ to the third lens L13 of the radius of curvature of the image side surface of S17, f1 ₆ sixth The effective focal length of lens L16.

The design of the lens and the aperture ST1 described above enables the imaging lens 1 to effectively shorten the total length of the lens, improve the viewing angle, effectively correct aberrations, and improve lens resolution.

Table 1 is a table of related parameters of the lenses of the imaging lens 1 in Fig. 1. Table 1 shows that the effective focal length of the imaging lens 1 of the present embodiment is equal to 4.2304 mm, the aperture value is equal to 2.2, the viewing angle is equal to 68.5°, and the total length of the lens is equal to 5.074mm.

The aspherical surface depression z of each lens in Table 1 is obtained by the following formula: z = ch ² /{1 + [1 - (k + 1) c ² h ² ] ^1/2 } + Ah ⁴ + Bh ⁶ + Ch ⁸ +Dh ¹⁰ +Eh ¹² +Fh ¹⁴ +Gh ¹⁶

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

Table 2 is a table of related parameters of the aspherical surface of each lens in Table 1, where k is a conical coefficient (Conic Constant) and A~G is an aspherical coefficient.

In the imaging lens 1 of the first embodiment, the effective focal length f1 _{4 of} the fourth lens L14 is -7.2589 mm, the effective focal length of the imaging lens 1 is f1 = 4.2304 mm, and the effective focal length of the fifth lens L15 is f1 ₅ = 51.08960 mm, the first The distance from the object side surface S12 of the lens L11 to the imaging surface IMA1 on the optical axis OA1 is TTL1=5.074 mm, the radius of curvature R1 ₁₁ of the object side surface S12 of the first lens L11 is 1.60893 mm, and the radius of curvature of the image side surface S13 of the first lens L11. R1 ₁₂ = -23.11372 mm, the radius of curvature R1 ₂₁ = 2.92011 mm of the object side surface S14 of the second lens L12, the curvature radius R1 ₂₂ of the image side surface S15 of the second lens L12 = 1.35420 mm, and the object side surface S16 of the third lens L13 The radius of curvature R1 ₃₁ = 20.57349 mm, the radius of curvature R1 _{32 of the} third lens L13 is R1 ₃₂ = -4.65176 mm, and the effective focal length of the sixth lens L16 is f1 ₆ = 19.54329 mm. From the above data, f1 ₄ /f1 = - 1.7159, f1 ₅ /f1=12.0768, f1/TTL1=0.8337, (R1 ₁₁ -R1 ₁₂ )/(R1 ₁₁ +R1 ₁₂ )=-1.1496, (R1 ₂₁ -R1 ₂₂ )/(R1 ₂₁ +R1 ₂₂ )= 0.3664, (R1 _{31 -} R1 ₃₂ ) / (R1 ₃₁ + R1 ₃₂ ) = 1.5843, and f1 ₆ / f1 = 4.6197, all satisfying the requirements of the above conditions (1) to (7).

In addition, the optical performance of the imaging lens 1 of the first embodiment can also be achieved, which can be seen from the 2A to 2C drawings. Fig. 2A is a longitudinal Spherical Aberration diagram of the imaging lens 1 of the first embodiment. Figure 2B shows that The astigmatic field curve of the imaging lens 1 of the first embodiment. Fig. 2C is a distortion diagram of the imaging lens 1 of the first embodiment.

As can be seen from FIG. 2A, the longitudinal lens difference produced by the imaging lens 1 of the first embodiment for light having wavelengths of 486.1300 nm, 587.5600 nm, and 656.2800 nm is between -0.013 mm and 0.025 mm. As can be seen from FIG. 2B, the imaging lens 1 of the first embodiment has an astigmatic field curvature of -0.038 mm to 0.013 mm in the direction of the tangential direction and the sagittal direction for the light having a wavelength of 587.5600 nm. between. As can be seen from FIG. 2C, the imaging lens 1 of the first embodiment has a distortion of between 0% and 2.3% for light having a wavelength of 587.5600 nm. It is apparent that the longitudinal spherical aberration, the astigmatic field curvature, and the distortion 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 a lens configuration and an optical path of a second embodiment of an imaging lens according to the present invention. The imaging lens 2 sequentially includes an aperture ST2, a first lens L21, a second lens L22, a third lens L23, a fourth lens L24, and a fifth lens L25 from the object side to the image side along the optical axis OA2. a sixth lens L26 and a filter OF2. At the time of imaging, the light from the object side is finally imaged on an image plane IMA2. The first lens L21 has a positive refractive power made of a plastic material, and the object side surface S22 has a convex surface side surface S23 which is a concave surface, and the object side surface S22 and the image side surface S23 are aspherical surfaces. The second lens L22 has a negative refractive power made of a plastic material, and the object side surface S24 has a convex image side surface S25 as a concave surface, and the object side surface S24 and the image side surface S25 are aspherical surfaces. The third lens L23 has a positive refractive power made of a plastic material, and the object side surface S26 has a convex image side surface S27 as a convex surface, and the object side surface S26 and the image side surface S27 are aspherical surfaces. The fourth lens L24 has a negative refractive power made of a plastic material, and the object side surface S28 has a concave image side surface S29 as a convex surface, and the object side surface S28 and the image side surface S29 are aspherical surfaces. The fifth lens L25 has a positive refractive power made of a plastic material, and the object side surface S210 has a concave image side surface S211 which is convex, and the object side surface Both the S210 and the image side surface S211 are aspherical surfaces. The sixth lens L26 has a positive refractive power made of a plastic material, and the object side surface S212 has a convex image side surface S213 as a concave surface, and the object side surface S212 and the image side surface S213 are aspherical surfaces. The filter side OF2 has a flat side surface S214 and an image side surface S215.

In addition, in order to maintain good optical performance of the imaging lens of the present invention, the imaging lens 2 of the second embodiment is required to satisfy the following seven conditions:

Where f2 ₄ is the effective focal length of the fourth lens L24, f2 is the effective focal length of the imaging lens 2, f2 ₅ is the effective focal length of the fifth lens L25, and TTL2 is the object side S22 of the first lens L21 to the imaging plane IMA2 on the optical axis The distance on the OA2, R2 ₁₁ is the radius of curvature of the object side surface S22 of the first lens L21, R2 ₁₂ is the radius of curvature of the image side surface S23 of the first lens L21, and R2 ₂₁ is the radius of curvature of the object side surface S24 of the second lens L22. R2 ₂₂ a radius of curvature of the image side surface of the second lens L22 of S25, R2 ₃₁ side surface S26 of a radius of curvature of the third lens L23 thereof, R2 ₃₂ of the third lens L23 of the side surface S27 of the curvature radius, f2 ₆ sixth The effective focal length of lens L26.

The design of the lens and the aperture ST2 described above enables the imaging lens 2 to effectively shorten the total length of the lens, improve the viewing angle, effectively correct aberrations, and improve lens resolution.

Table 3 is a table of related parameters of the lenses of the imaging lens 2 in FIG. 3, and Table 3 shows that the effective focal length of the imaging lens 2 of the present embodiment is equal to 4.2300 mm, the aperture value, and the like. In 2.1, the viewing angle is equal to 68.7°, and the total length of the lens is equal to 5.111 mm.

The aspherical surface depression z of each 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 +Eh ¹² +Fh ¹⁴ +Gh ¹⁶

Where: c: curvature; h: vertical distance from any point on the lens surface to the optical axis; k: conic coefficient; A~G: aspheric coefficient.

Table 4 is the relevant parameter table of the aspherical surface of each lens in Table 3, where k is the conical coefficient (Conic Constant) and A~G is the aspherical coefficient.

In the imaging lens 2 of the second embodiment, the effective focal length f2 _{4 of} the fourth lens L24 is -5.9056 mm, the effective focal length of the imaging lens 2 is f2 = 4.2300 mm, and the effective focal length of the fifth lens L25 is f2 ₅ = 51.38527 mm, the first The distance from the object side surface S22 of the lens L21 to the imaging surface IMA2 on the optical axis OA2 is TTL2=5.111 mm, the radius of curvature R2 ₁₁ of the object side surface S22 of the first lens L21 is 1.54413 mm, and the radius of curvature of the image side surface S23 of the first lens L21. R2 ₁₂ =9.67325 mm, the radius of curvature R2 ₂₁ =3.61352 mm of the object side surface S24 of the second lens L22, the curvature radius R2 ₂₂ of the image side surface S25 of the second lens L22 = 1.67168 mm, and the curvature of the object side surface S26 of the third lens L23 The radius R2 ₃₁ = 5.84450 mm, the radius of curvature R2 _{32 of the} third lens L23 is R5 ₃₂ = -5.97789 mm, and the effective focal length of the sixth lens L26 is f2 ₆ = 14.10489 mm. From the above data, f2 _{4 /} f2 = -1.3962 , f2 ₅ /f2=12.1485, f2/TTL2=0.8276, (R2 ₁₁ -R2 ₁₂ )/(R2 ₁₁ +R2 ₁₂ )=-0.7247, (R2 ₂₁ -R2 ₂₂ )/(R2 ₂₁ +R2 ₂₂ )=0.3674 (R2 _{31 -} R2 ₃₂ ) / (R2 ₃₁ + R2 ₃₂ ) = -90.6927, f2 ₆ / f2 = 3.3347, all of which satisfy the requirements of the above conditions (8) to (14).

In addition, the optical performance of the imaging lens 2 of the second embodiment can also be achieved, which can be seen from Figs. 4A to 4C. Fig. 4A is a longitudinal Spherical Aberration diagram of the imaging lens 2 of the second embodiment. Fig. 4B is an astigmatic field curve diagram of the imaging lens 2 of the second embodiment. Fig. 4C is a distortion diagram of the imaging lens 2 of the second embodiment.

As can be seen from FIG. 4A, the longitudinal lens difference produced by the imaging lens 2 of the second embodiment for light having wavelengths of 486.1300 nm, 587.5600 nm, and 656.2800 nm is between -0.038 mm and 0.038 mm. As can be seen from FIG. 4B, the imaging lens 2 of the second embodiment has an astigmatic field curvature of -0.075 mm to 0.038 mm in the direction of the tangential direction and the sagittal direction for the light having a wavelength of 587.5600 nm. between. As can be seen from Fig. 4C, the imaging lens 2 of the second embodiment produces a distortion of between 0% and 2.3% for light having a wavelength of 587.5600 nm. It is apparent that the longitudinal spherical aberration, the astigmatic field curvature, and the distortion of the imaging lens 2 of the second embodiment can be effectively corrected, thereby obtaining better optical performance.

Please refer to FIG. 5, which 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 sequentially includes an aperture ST3, a first lens L31, a second lens L32, a third lens L33, a fourth lens L34, and a fifth lens L35 from the object side to the image side along the optical axis OA3. A sixth lens L36 and a filter OF3. At the time of imaging, the light from the object side is finally imaged on an image plane IMA3. The first lens L31 has a positive refractive power made of a plastic material, and the object side surface S32 has a convex image side surface S33 as a convex surface, and the object side surface S32 and the image side surface S33 are aspherical surfaces. The second lens L32 has a negative refractive power made of a plastic material, and the object side surface S34 has a convex image side surface S35 which is a concave surface, and the object side surface S34 and the image side surface S35 are both aspherical surfaces. The third lens L33 has a positive refractive power made of a plastic material, and the object side surface S36 has a convex image side surface S37 as a convex surface, and the object side surface S36 and the image side surface S37 are aspherical surfaces. fourth The lens L34 has a negative refractive power made of a plastic material, and the object side surface S38 has a concave image side surface S39 as a convex surface, and the object side surface S38 and the image side surface S39 are aspherical surfaces. The fifth lens L35 has a positive refractive power made of a plastic material, and the object side surface S310 has a concave image side surface S311 as a convex surface, and the object side surface S310 and the image side surface S311 are both aspherical surfaces. The sixth lens L36 has a positive refractive power made of a plastic material, and the object side surface S312 has a convex image side surface S313 as a concave surface, and the object side surface S312 and the image side surface S313 are aspherical surfaces. The filter OF3 has a flat surface S314 and an image side surface S315.

In addition, in order to maintain good optical performance of the imaging lens of the present invention, the imaging lens 3 of the third embodiment is required to satisfy the following seven conditions:

Where f3 ₄ is the effective focal length of the fourth lens L34, f3 is the effective focal length of the imaging lens 3, f3 ₅ is the effective focal length of the fifth lens L35, and TTL3 is the object side S32 of the first lens L31 to the imaging plane IMA3 on the optical axis The distance on the OA3, R3 ₁₁ is the radius of curvature of the object side surface S32 of the first lens L31, R3 ₁₂ is the radius of curvature of the image side surface S33 of the first lens L31, and R3 ₂₁ is the radius of curvature of the object side surface S34 of the second lens L32. R3 ₂₂ is the radius of curvature of the image side surface S35 of the second lens L32, R3 ₃₁ is the radius of curvature of the object side surface S36 of the third lens L33, R3 ₃₂ is the radius of curvature of the image side surface S37 of the third lens L33, and f3 ₆ is the sixth The effective focal length of lens L36.

With the design of the above lens and aperture ST3, the imaging lens 3 can be Effectively shortens the total length of the lens, improves the viewing angle, effectively corrects aberrations, and improves lens resolution.

Table 5 is a table of related parameters of the lenses of the imaging lens 3 in FIG. 5. Table 5 shows that the effective focal length of the imaging lens 3 of the present embodiment is equal to 4.1263 mm, the aperture value is equal to 2.2, the viewing angle is equal to 69.9°, and the total length of the lens is equal to 5.171mm.

The aspherical surface depression z of each lens in Table 5 is obtained by the following formula: z = ch ² /{1 + [1 - (k + 1) c ² h ² ] ^1/2 } + Ah ⁴ + Bh ⁶ + ^{Ch 8 + Dh 10 + Eh 12} + Fh 14 + Gh 16

Where: c: curvature; h: vertical distance from any point on the lens surface to the optical axis; k: conic coefficient; A~G: aspheric coefficient.

Table 6 is the relevant parameter table of the aspherical surface of each lens in Table 5, where k is the conic coefficient (Conic Constant) and A~G is the aspherical coefficient.

In the imaging lens 3 of the third embodiment, the effective focal length f3 _{4 of} the fourth lens L34 is -5.6582 mm, the effective focal length of the imaging lens 3 is f3 = 4.1263 mm, and the effective focal length of the fifth lens L35 is f3 ₅ = 94.59428 mm, the first The distance from the object side surface S32 of the lens L31 to the imaging surface IMA3 on the optical axis OA3 is TTL3=5.171 mm, the radius of curvature R3 ₁₁ of the object side surface S32 of the first lens L31 is 1.81502 mm, and the radius of curvature of the image side surface S33 of the first lens L31. R3 ₁₂ = -18.25035 mm, the radius of curvature R3 ₂₁ = 2.43828 mm of the object side surface S34 of the second lens L32, the curvature radius R3 ₂₂ of the image side surface S35 of the second lens L32 = 1.27797 mm, and the object side surface S36 of the third lens L33 The radius of curvature R3 ₃₁ = 30.56156 mm, the radius of curvature of the image side surface S37 of the third lens L33 is R3 ₃₂ = -2.78424 mm, and the effective focal length of the sixth lens L36 is f3 ₆ = 15.46644 mm. From the above data, f3 ₄ /f3 = - 1.3713, f3 ₅ /f3=22.9247, f3/TTL3=0.7980, (R3 ₁₁ -R3 ₁₂ )/(R3 ₁₁ +R3 ₁₂ )=-1.2209, (R3 ₂₁ -R3 ₂₂ )/(R3 ₂₁ +R3 ₂₂ )= 0.3122, (R3 _{31 -} R3 ₃₂ ) / (R3 ₃₁ + R3 ₃₂ ) = 1.2005, f3 ₆ / f3 = 3.7483, all satisfying the requirements of the above conditions (15) to (21).

Further, the optical performance of the imaging lens 3 of the third embodiment can also be achieved, which can be seen from Figs. 6A to 6C. Fig. 6A is a longitudinal Spherical Aberration diagram of the imaging lens 3 of the third embodiment. Fig. 6B is an astigmatism field curve diagram of the imaging lens 3 of the third embodiment. Fig. 6C is a distortion diagram of the imaging lens 3 of the third embodiment.

As can be seen from Fig. 6A, the longitudinal lens difference produced by the imaging lens 3 of the third embodiment for light having wavelengths of 486.1300 nm, 587.5600 nm, and 656.2800 nm is between -0.025 mm and 0.038 mm. As can be seen from FIG. 6B, the imaging lens 3 of the third embodiment has an astigmatic field curvature of -0.075 mm to 0.013 mm in the direction of the tangential direction and the sagittal direction for the light having a wavelength of 587.5600 nm. between. As can be seen from Fig. 6C, the distortion of the imaging lens 3 of the third embodiment for light having a wavelength of 587.5600 nm is between 0% and 2.3%. It is apparent that the longitudinal spherical aberration, the astigmatic field curvature, and the distortion of the imaging lens 3 of the third embodiment can be effectively corrected, thereby obtaining better optical performance.

Please refer to FIG. 7. FIG. 7 is a schematic view showing a lens configuration and an optical path of a fourth embodiment of the imaging lens according to the present invention. The imaging lens 4 sequentially includes an aperture ST4, a first lens L41, a second lens L42, a third lens L43, a fourth lens L44, and a fifth lens L45 from the object side to the image side along the optical axis OA4. a sixth lens L46 and a filter OF4. At the time of imaging, the light from the object side is finally imaged on an image plane IMA4. The first lens L41 has a positive refractive power made of a plastic material, and the object side surface S42 has a convex image side surface S43 as a convex surface, and the object side surface S42 and the image side surface S43 are aspherical surfaces. The second lens L42 has a negative refractive power made of a plastic material, and the object side surface S44 has a convex image side surface S45 as a concave surface, and the object side surface S44 and the image side surface S45 are both Aspherical surface. The third lens L43 has a positive refractive power made of a plastic material, and the object side surface S46 has a concave image side surface S47 as a convex surface, and the object side surface S46 and the image side surface S47 are aspherical surfaces. The fourth lens L44 has a negative refractive power made of a plastic material, and the object side surface S48 has a concave image side surface S49 as a convex surface, and the object side surface S48 and the image side surface S49 are aspherical surfaces. The fifth lens L45 has a positive refractive power made of a plastic material, and the object side surface S410 has a concave image side surface S411 as a convex surface, and the object side surface S410 and the image side surface S411 are aspherical surfaces. The sixth lens L46 has a positive refractive power made of a plastic material, and the object side surface S412 has a convex image side surface S413 as a concave surface, and the object side surface S412 and the image side surface S413 are aspherical surfaces. The filter OF4 has a flat surface S414 and an image side surface S415.

In addition, in order to maintain good optical performance of the imaging lens of the present invention, the imaging lens 4 of the fourth embodiment is required to satisfy the following seven conditions:

Where f4 ₄ is the effective focal length of the fourth lens L44, f4 is the effective focal length of the imaging lens 4, f4 ₅ is the effective focal length of the fifth lens L45, and TTL4 is the object side S42 of the first lens L41 to the imaging plane IMA4 on the optical axis The distance on the OA4, R4 ₁₁ is the radius of curvature of the object side surface S42 of the first lens L41, R4 ₁₂ is the radius of curvature of the image side surface S43 of the first lens L41, and R4 ₂₁ is the radius of curvature of the object side surface S44 of the second lens L42. R4 ₂₂ is the radius of curvature of the image side surface S45 of the second lens L42, R4 ₃₁ is the radius of curvature of the object side surface S46 of the third lens L43, R4 ₃₂ is the radius of curvature of the image side surface S47 of the third lens L43, and f4 ₆ is the sixth The effective focal length of lens L46.

The design of the lens and the aperture ST4 described above enables the imaging lens 4 to effectively shorten the total length of the lens, improve the viewing angle, effectively correct aberrations, and improve lens resolution.

Table 7 is a table of related parameters of the lenses of the imaging lens 4 in FIG. 7. Table 7 shows that the effective focal length of the imaging lens 4 of the present embodiment is equal to 4.0826 mm, the aperture value is equal to 2.1, the viewing angle is equal to 70.4°, and the total length of the lens is equal to 5.162mm.

The aspherical surface depression z of each lens in Table 7 is obtained by the following formula: z = ch ² /{1 + [1 - (k + 1) c ² h ² ] ^1/2 } + Ah ⁴ + Bh ⁶ + Ch ⁸ +Dh ¹⁰ +Eh ¹² +Fh ¹⁴ +Gh ¹⁶

Where: c: curvature; h: vertical distance from any point on the lens surface to the optical axis; k: conic coefficient; A~G: aspheric coefficient.

Table 8 is a table of related parameters of the aspherical surfaces of the respective lenses in Table 7, where k is a conical coefficient (Conic Constant) and A to G are aspherical coefficients.

In the imaging lens 4 of the fourth embodiment, the effective focal length f4 _{4 of} the fourth lens L44 is -5.9766 mm, the effective focal length of the imaging lens 4 is f4 = 4.0826 mm, and the effective focal length of the fifth lens L45 is f4 ₅ = 102.82794 mm, the first The distance from the object side surface S42 of the lens L41 to the imaging surface IMA4 on the optical axis OA4 is TTL4=5.162 mm, the radius of curvature R4 ₁₁ of the object side surface S42 of the first lens L41 is 1.83223 mm, and the radius of curvature of the image side surface S43 of the first lens L41. R4 ₁₂ = -16.04122 mm, the radius of curvature R4 ₂₁ of the object side S44 of the second lens L42 is 2.63800 mm, the radius of curvature R4 ₂₂ of the image side surface S45 of the second lens L42 is 1.432222 mm, and the object side surface S46 of the third lens L43 The radius of curvature R4 ₃₁ = -8.77334 mm, the radius of curvature R4 _{32 of the} third lens L43 is R2 ₃₂ = -2.246469 mm, and the effective focal length of the sixth lens L46 is f4 ₆ = 14.57148 mm. From the above data, f4 ₄ /f4 = _{-1.4639, f4 5 /f4=25.1870,f4/TTL4=0.7910,(R4 11 -R4 12} ) / (R4 11 + R4 12) = - 1.2579, (R4 21 -R4 22) / (R4 21 + R4 22) = 0.2962, (R4 ₃₁ - R4 ₃₂ ) / (R4 ₃₁ + R4 ₃₂ ) = 0.5661, f4 ₆ / f4 = 3.5692, all satisfying the requirements of the above conditions (22) to (28).

In addition, the optical performance of the imaging lens 4 of the fourth embodiment can also be achieved, which can be seen from Figs. 8A to 8C. Fig. 8A is a longitudinal Spherical Aberration diagram of the imaging lens 4 of the fourth embodiment. Fig. 8B is an astigmatism field curve diagram of the imaging lens 4 of the fourth embodiment. Fig. 8C is a distortion diagram of the imaging lens 4 of the fourth embodiment.

As can be seen from Fig. 8A, the longitudinal spherical aberration value of the imaging lens 4 of the fourth embodiment for light having wavelengths of 486.1300 nm, 587.5600 nm, and 656.2800 nm is between -0.025 mm and 0.038 mm. As can be seen from FIG. 8B, the imaging lens 4 of the fourth embodiment has an astigmatic field curvature of -0.075 mm to 0.013 mm in the direction of the tangential direction and the sagittal direction for the light having a wavelength of 587.5600 nm. between. As can be seen from Fig. 8C, the imaging lens 4 of the fourth embodiment produces a distortion of between 0% and 2.3% for light having a wavelength of 587.5600 nm. It is apparent that the longitudinal spherical aberration, the astigmatic field curvature, and the distortion of the imaging lens 4 of the fourth embodiment can be effectively corrected, thereby obtaining better optical performance.

Referring to FIG. 9, FIG. 9 is a schematic diagram showing a lens configuration and an optical path of a fifth embodiment of an imaging lens according to the present invention. The imaging lens 5 sequentially includes an aperture ST5, a first lens L51, a second lens L52, a third lens L53, a fourth lens L54, and a fifth lens L55 from the object side to the image side along the optical axis OA5. A sixth lens L56 and a filter OF5. At the time of imaging, the light from the object side is finally imaged on an image plane IMA5. The first lens L51 has a positive vertex The light force is made of a plastic material, and the object side surface S52 has a convex image side surface S53 as a convex surface, and the object side surface S52 and the image side surface S53 are aspherical surfaces. The second lens L52 has a negative refractive power made of a plastic material, and the object side surface S54 has a convex image side surface S55 which is a concave surface, and the object side surface S54 and the image side surface S55 are aspherical surfaces. The third lens L53 has a positive refractive power made of a plastic material, and the object side surface S56 has a concave image side surface S57 as a convex surface, and the object side surface S56 and the image side surface S57 are aspherical surfaces. The fourth lens L54 has a positive refractive power made of a plastic material, and the object side surface S58 has a concave image side surface S59 as a convex surface, and the object side surface S58 and the image side surface S59 are aspherical surfaces. The fifth lens L55 has a positive refractive power made of a plastic material, and the object side surface S510 has a concave image side surface S511 as a convex surface, and the object side surface S510 and the image side surface S511 are aspherical surfaces. The sixth lens L56 has a positive refractive power made of a plastic material, and the object side surface S512 has a convex image side surface S513 as a concave surface, and the object side surface S512 and the image side surface S513 are aspherical surfaces. The filter OF5 has a flat side surface S514 and an image side surface S515.

In addition, in order to maintain good optical performance of the imaging lens of the present invention, the imaging lens 5 of the fifth embodiment is required to satisfy the following two conditions:

Where f5 ₄ is the effective focal length of the fourth lens L54, f5 is the effective focal length of the imaging lens 5, and TTL5 is the distance from the object side S52 of the first lens L51 to the imaging plane IMA5 on the optical axis OA5.

With the design of the above lens and aperture ST5, the imaging lens 5 can effectively shorten the total length of the lens, improve the viewing angle, effectively correct the aberration, and improve the lens resolution.

Table 9 is a table of related parameters of the lenses of the imaging lens 5 in FIG. 9. Table 9 shows that the effective focal length of the imaging lens 5 of the present embodiment is equal to 3.2114 mm, the aperture value is equal to 2.2, the viewing angle is equal to 83.9°, and the total length of the lens is equal to 4.599mm.

The aspherical surface depression z of each lens in Table 9 is obtained by the following formula: z = ch ² /{1 + [1 - (k + 1) c ² h ² ] ^1/2 } + Ah ⁴ + Bh ⁶ + Ch ⁸ +Dh ¹⁰ +Eh ¹² +Fh ¹⁴ +Gh ¹⁶

Where: c: curvature; h: vertical distance from any point on the lens surface to the optical axis; k: conic coefficient; A~G: aspheric coefficient.

Table 10 is the relevant parameter table of the aspherical surface of each lens in Table 9, where k is a conical coefficient (Conic Constant) and A~G is an aspherical coefficient.

In the imaging lens 5 of the fifth embodiment, the effective focal length f5 _{4 of} the fourth lens L54 is 33.0280 mm, the effective focal length of the imaging lens 5 is f5=3.2114 mm, and the object side surface S52 of the first lens L51 to the imaging plane IMA5 is on the optical axis OA5. The distance above is TTL5=4.599mm. From the above data, f5 ₄ /f5=10.2846 and f5/TTL5=0.6983 can be obtained, which can meet the requirements of the above conditions (29) to (30).

In addition, the optical performance of the imaging lens 5 of the fifth embodiment can also be achieved, which can be seen from the 10A to 10C drawings. Fig. 10A is a longitudinal Spherical Aberration diagram of the imaging lens 5 of the fifth embodiment. Fig. 10B is a view showing an astigmatism field curve of the imaging lens 5 of the fifth embodiment. Fig. 10C is a distortion diagram of the imaging lens 5 of the fifth embodiment.

As can be seen from Fig. 10A, the imaging lens 5 of the fifth embodiment produces a longitudinal spherical aberration value of -0.005 mm to 0.045 mm for light having a wavelength of 435.8400 nm, 546.0700 nm, and 656.2800 nm. As can be seen from FIG. 10B, the imaging lens of the fifth embodiment 5 pairs of light with a wavelength of 546.0700 nm have an astigmatic field curvature between -0.2 mm and 0.06 mm in the direction of the Tangential and the Sagittal direction. As can be seen from Fig. 10C, the imaging lens 5 of the fifth embodiment produces a distortion of -0.1% to 2.0% for light having a wavelength of 546.0700 nm. It is apparent that the longitudinal spherical aberration, the astigmatic field curvature, and the distortion of the imaging lens 5 of the fifth embodiment can be effectively corrected, thereby obtaining better optical performance.

Please refer to FIG. 11, which is a schematic diagram of a lens configuration and an optical path of a sixth embodiment of an imaging lens according to the present invention. The imaging lens 6 sequentially includes an aperture ST6, a first lens L61, a second lens L62, a third lens L63, a fourth lens L64, and a fifth lens L65 from the object side to the image side along the optical axis OA6. a sixth lens L66 and a filter OF6. At the time of imaging, the light from the object side is finally imaged on an image plane IMA6. The first lens L61 has a positive refractive power made of a plastic material, and the object side surface S62 has a convex image side surface S63 as a convex surface, and the object side surface S62 and the image side surface S63 are aspherical surfaces. The second lens L62 has a negative refractive power made of a plastic material, and the object side surface S64 has a convex image side surface S65 as a concave surface, and the object side surface S64 and the image side surface S65 are aspherical surfaces. The third lens L63 has a positive refractive power made of a plastic material, and the object side surface S66 has a concave image side surface S67 as a convex surface, and the object side surface S66 and the image side surface S67 are aspherical surfaces. The fourth lens L64 has a positive refractive power made of a plastic material, and the object side surface S68 has a concave image side surface S69 as a convex surface, and the object side surface S68 and the image side surface S69 are aspherical surfaces. The fifth lens L65 has a positive refractive power made of a plastic material, and the object side surface S610 has a concave image side surface S611 as a convex surface, and the object side surface S610 and the image side surface S611 are both aspherical surfaces. The sixth lens L66 has a positive refractive power made of a plastic material, and the object side surface S612 has a convex image side surface S613 as a concave surface, and the object side surface S612 and the image side surface S613 are aspherical surfaces. The filter OF6 has a flat side surface S614 and an image side surface S615.

In addition, in order to maintain good optical performance of the imaging lens of the present invention, the imaging lens 6 of the sixth embodiment is required to satisfy the following two conditions:

Where f6 ₄ is the effective focal length of the fourth lens L64, f6 is the effective focal length of the imaging lens 6, and TTL6 is the distance from the object side S62 of the first lens L61 to the imaging plane IMA6 on the optical axis OA6.

The design of the lens and the aperture ST6 described above enables the imaging lens 6 to effectively shorten the total length of the lens, improve the viewing angle, effectively correct aberrations, and improve lens resolution.

Table 11 is a table of related parameters of the lenses of the imaging lens 6 in FIG. 11. Table 11 shows that the effective focal length of the imaging lens 6 of the present embodiment is equal to 3.6224 mm, the aperture value is equal to 2.0, the viewing angle is equal to 77.0°, and the total length of the lens is Degree is equal to 4.795mm.

The aspherical surface depression _z of each lens in Table 11 is obtained by the following formula: z = ch ² /{1 + [1 - (k + 1) c ² h ² ] ^1/2 } + Ah ⁴ + Bh ⁶ +Ch ⁸ +Dh ¹⁰ +Eh ¹² +Fh ¹⁴ +Gh ¹⁶

Where: c: curvature; h: vertical distance from any point on the lens surface to the optical axis; k: conic coefficient; A~G: aspheric coefficient.

Table 12 is the relevant parameter table of the aspherical surface of each lens in Table 11, where k is a conical coefficient (Conic Constant) and A~G is an aspherical coefficient.

In the imaging lens 6 of the sixth embodiment, the effective focal length f6 _{4 of} the fourth lens L64 is 87.4928 mm, the effective focal length of the imaging lens 6 is f6 = 3.6224 mm, and the object side surface S62 of the first lens L61 to the imaging plane IMA6 is on the optical axis OA6. The distance above is TTL6=4.795mm. From the above data, f6 ₄ /f6=24.1475 and f6/TTL6=0.7555 can be obtained, which can meet the requirements of the above conditions (31) to (32).

In addition, the optical performance of the imaging lens 6 of the sixth embodiment can also be achieved, which can be seen from Figs. 12A to 12C. Fig. 12A is a longitudinal Spherical Aberration diagram of the imaging lens 6 of the sixth embodiment. Fig. 12B is an astigmatic field curve diagram of the imaging lens 6 of the sixth embodiment. Fig. 12C is a distortion diagram of the imaging lens 6 of the sixth embodiment.

As can be seen from Fig. 12A, the longitudinal spherical aberration of the imaging lens 6 of the sixth embodiment for light having a wavelength of 435.8400 nm, 546.0700 nm, and 656.2800 nm is between -0.010 mm and 0.036 mm. As can be seen from Fig. 12B, the imaging lens 6 of the sixth embodiment has an astigmatic field curvature of -0.12 mm to 0.04 mm in the direction of the tangential direction and the sagittal direction for the light having a wavelength of 546.0700 nm. between. As can be seen from Fig. 12C, the imaging lens 6 of the sixth embodiment has a distortion of between 0% and 2.3% for light having a wavelength of 546.0700 nm. It is apparent that the longitudinal spherical aberration, the astigmatic field curvature, and the distortion of the imaging lens 6 of the sixth embodiment can be effectively corrected, thereby obtaining better optical performance.

Please refer to FIG. 13, which is a schematic diagram of a lens configuration and an optical path of a seventh embodiment of an imaging lens according to the present invention. The imaging lens 7 sequentially includes an aperture ST7, a first lens L71, a second lens L72, a third lens L73, a fourth lens L74, and a fifth lens L75 from the object side to the image side along the optical axis OA7. A sixth lens L76 and a filter OF7. At the time of imaging, the light from the object side is finally imaged on an image plane IMA7. The first lens L71 has a positive refractive power made of a plastic material, and the object side surface S72 has a convex image side surface S73 as a convex surface, and the object side surface S72 and the image side surface S73 are aspherical surfaces. The second lens L72 has a negative refractive power made of a plastic material, and the object side surface S74 has a convex image side surface S75 as a concave surface, and the object side surface S74 and the image side surface S75 are both Aspherical surface. The third lens L73 has a positive refractive power made of a plastic material, and the object side surface S76 has a concave image side surface S77 as a convex surface, and the object side surface S76 and the image side surface S77 are aspherical surfaces. The fourth lens L74 has a positive refractive power made of a plastic material, and the object side surface S78 has a concave image side surface S79 as a convex surface, and the object side surface S78 and the image side surface S79 are aspherical surfaces. The fifth lens L75 has a positive refractive power made of a plastic material, and the object side surface S710 has a concave image side surface S711 as a convex surface, and the object side surface S710 and the image side surface S711 are both aspherical surfaces. The sixth lens L76 has a positive refractive power made of a plastic material, and the object side surface S712 has a convex image side surface S713 which is a concave surface, and the object side surface S712 and the image side surface S713 are both aspherical surfaces. The filter OF7 has a flat side surface S714 and an image side surface S715.

In addition, in order to maintain good optical performance of the imaging lens of the present invention, the imaging lens 7 of the seventh embodiment is required to satisfy the following two conditions:

Where f7 ₄ is the effective focal length of the fourth lens L74, f7 is the effective focal length of the imaging lens 7, and TTL7 is the distance from the object side S72 of the first lens L71 to the imaging plane IMA7 on the optical axis OA7.

With the design of the above lens and aperture ST7, the imaging lens 7 can effectively shorten the total length of the lens, improve the viewing angle, effectively correct aberrations, and improve lens resolution.

Table 13 is a table of related parameters of the lenses of the imaging lens 7 in Fig. 13. Table 13 shows that the effective focal length of the imaging lens 7 of the present embodiment is equal to 3.7460 mm, the aperture value is equal to 2.2, the viewing angle is equal to 75.2°, and the total length of the lens is Degree is equal to 4.873mm.

The aspherical surface depression z of each lens in Table 13 is obtained by the following formula: z = ch ² /{1 + [1 - (k + 1) c ² h ² ] ^1/2 } + Ah ⁴ + Bh ⁶ +Ch ⁸ +Dh ¹⁰ +Eh ¹² +Fh ¹⁴ +Gh ¹⁶

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

Table 14 is a table of related parameters of the aspherical surfaces of the respective lenses in Table 13, where k is a conical coefficient (Conic Constant) and A to G are aspherical coefficients.

In the imaging lens 7 of the seventh embodiment, the effective focal length f7 _{4 of} the fourth lens L74 is 91.3460 mm, the effective focal length f7 of the imaging lens 7 is 3.7460 mm, and the object side surface S72 of the first lens L71 to the imaging plane IMA7 is on the optical axis OA7. The distance above is TTL7=4.873mm. From the above data, f7 ₄ /f7=24.3847 and f7/TTL7=0.7687 can be obtained, which can meet the requirements of the above conditions (33) to (34).

Further, the optical performance of the imaging lens 7 of the seventh embodiment can also be achieved, which can be seen from Figs. 14A to 14C. Fig. 14A is a longitudinal Spherical Aberration diagram of the imaging lens 7 of the seventh embodiment. Fig. 14B is a view showing an astigmatism field curve of the imaging lens 7 of the seventh embodiment. Fig. 14C is a distortion diagram of the imaging lens 7 of the seventh embodiment.

As can be seen from Fig. 14A, the longitudinal spherical aberration value of the imaging lens 7 of the seventh embodiment for light having a wavelength of 435.8400 nm, 546.0700 nm, and 656.2800 nm is between -0.030 mm and 0.050 mm. As can be seen from Fig. 14B, the imaging lens 7 of the seventh embodiment has an astigmatic field curvature of -0.1 mm to 0.05 mm in the direction of the tangential direction and the sagittal direction for the light having a wavelength of 546.0700 nm. between. As can be seen from Fig. 14C, the imaging lens 7 of the seventh embodiment has a distortion of -0.1% to 2.3% for light having a wavelength of 546.0700 nm. between. It is apparent that the longitudinal spherical aberration, the astigmatic field curvature, and the distortion of the imaging lens 7 of the seventh embodiment can be effectively corrected, thereby obtaining better optical performance.

In the above embodiment, the object side surface and the image side surface of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are both aspherical surfaces, but it can be understood that if the first lens, It is also within the scope of the present invention that the object side and the image side of the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are at least one aspherical surface.

1‧‧‧ imaging lens

L11‧‧‧ first lens

L12‧‧‧ second lens

L13‧‧‧ third lens

L14‧‧‧4th lens

L15‧‧‧ fifth lens

L16‧‧‧ sixth lens

ST1‧‧‧ aperture

OF1‧‧‧Filter

OA1‧‧‧ optical axis

IMA1‧‧‧ imaging surface

S11, S12, S13, S14, S15‧‧

S16, S17, S18, S19, S110‧‧‧

S111, S112, S113, S114, S115‧‧‧

Claims (16)

An imaging lens includes, in order from the object side to the image side along the optical axis, a first lens having a positive refractive power and including a convex surface facing the object side; a second lens, the second The lens has a refractive power; a third lens having a refractive power; a fourth lens having a refractive power; a fifth lens having a positive refractive power; and a sixth lens, the sixth lens The lens has a positive refractive power; the imaging lens satisfies the following condition: 0.69 f/TTL 0.85, where f is the effective focal length of the imaging lens, and TTL is the distance from the object side of the first lens to an imaging surface on the optical axis. The imaging lens according to claim 1, wherein the fourth lens has a negative refractive power, and a concave surface of the fourth lens faces the object side convex surface toward the image side. The imaging lens of claim 2, wherein the imaging lens satisfies the following condition: -1.8 f ₄ /f -1.3 wherein f _{4 is} the effective focal length of the fourth lens, and f is the effective focal length of the imaging lens. The imaging lens of claim 2, wherein the sixth lens satisfies the following conditions: 3 f ₆ /f 5 wherein f _{6 is} the effective focal length of the sixth lens, and f is the effective focal length of the imaging lens. The imaging lens of claim 2, wherein the first lens satisfies the following condition: -1.5 (R ₁₁ -R ₁₂ )/(R ₁₁ +R ₁₂ ) -0.5 wherein R _{11 is} the radius of curvature of the side surface of the first lens, and R _{12 is} the radius of curvature of the image side of the first lens. The imaging lens of claim 2, wherein the second lens satisfies the following condition: 0.2 (R ₂₁ -R ₂₂ )/(R ₂₁ +R ₂₂ ) 0.4 wherein R _{21 is a} radius of curvature of an object side surface of the second lens, and R _{22 is a} radius of curvature of an image side surface of the second lens. The imaging lens of claim 1, wherein the imaging lens satisfies the following conditions: 5 f ₅ /f 100, wherein f ₅ is an effective focal length of the fifth lens, and f is an effective focal length of the imaging lens. The imaging lens of claim 1, wherein the third lens satisfies the following condition: -100 (R ₃₁ -R ₃₂ )/(R ₃₁ +R ₃₂ ) 2, wherein R _{31 is a} radius of curvature of an object side surface of the third lens, and R _{32 is a} radius of curvature of an image side surface of the third lens. The imaging lens of claim 1, wherein the second lens has a convex-concave lens having a negative refractive power, and a convex surface of the second lens faces the object-side concave surface toward the image side. The imaging lens of claim 1, wherein the third lens has a positive refractive power and includes a convex surface that faces the image side. The imaging lens of claim 1, wherein the sixth lens is a convex-concave lens, and a convex surface of the sixth lens faces the object side concave surface toward the image side. The imaging lens of claim 1, wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the object side and the image side of the sixth lens are At least one side is an aspherical surface. The imaging lens of claim 1, further comprising an aperture disposed between the object side and the first lens. The imaging lens according to claim 1, wherein the fourth lens has a positive refractive power, and a concave surface of the fourth lens faces the object side convex surface toward the image side. The imaging lens of claim 14, wherein the imaging lens satisfies the following conditions: 5 f ₄ /f 30, where f _{4 is} the effective focal length of the fourth lens, and f is the effective focal length of the imaging lens. An imaging lens includes, in order from the object side to the image side along the optical axis, a first lens having a positive refractive power and including a convex surface facing the object side; a second lens, the second The lens has a convex-concave lens having a negative refractive power, a convex surface of the second lens facing the object side concave surface toward the image side; a third lens having a positive refractive power and including a convex surface facing the image side; a fourth lens which is a meniscus lens having a concave surface facing the object side convex surface facing the image side; a fifth lens having a positive refractive power of the convex lens and a concave surface of the fifth lens a convex surface of the object facing the image side; and a sixth lens having a positive refractive power, the convex surface of the sixth lens facing the object side concave surface facing the image side; the imaging lens satisfies the following condition: 0.69 f/TTL 0.85, 11.5 f ₅ /f 26.5,0 (R ₃₁ -R ₃₂ )/(R ₃₁ +R ₃₂ ) 1 wherein f is the effective focal length of the imaging lens, TTL is the distance from the side of the first lens to an imaging surface on the optical axis, f _{5 is} the effective focal length of the fifth lens, and R _{31 is} the first The radius of curvature of the side surface of the three lens, R _{32 is} the radius of curvature of the image side of the third lens.