Imaging lens

Abstract

An imaging lens includes a first, second, third, fourth, fifth, and sixth lens. The first lens is a meniscus lens with negative refractive power and includes a convex surface facing the object side and a concave surface facing the image side. The second lens has refractive power and includes a concave surface facing the object side. The third lens has refractive power and includes a convex surface facing the image side. The fourth lens has refractive power and includes a convex surface facing the image side. The fifth lens has refractive power. The sixth lens is a biconvex lens with positive refractive power. The imaging lens satisfies the condition: 87mm. 2 ≤fLL×TTL≤111mm 2 Or condition: 12 degrees / mm ≤ HFOV / fLL ≤ 17 degrees / mm; where fLL is the effective focal length of the lens closest to the image side, TTL is the distance from the object side of the first lens to the imaging surface along the optical axis, and HFOV is the half field of view of the imaging lens.

Description

TECHNICAL FIELD

[0001] The present application relates to an imaging lens. BACKGROUND

[0002] The development trend of the imaging lens is to have a large field of view, small size, high resolution and day and night co-focusing. The existing imaging lens cannot meet the current requirements, so a new imaging lens structure is needed to meet the requirements of large field of view, small size, high resolution and day and night co-focusing. SUMMARY

[0003] The technical problem to be solved by the present application is to provide an imaging lens with a larger field of view, shorter total lens length, higher resolution, day and night co-focusing, and good optical performance.

[0004] The technical solution adopted by the present application to solve the technical problem is to provide an imaging lens, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. The first lens has negative refractive power, the first lens is a meniscus lens, and comprises a convex surface facing the object side and a concave surface facing the image side. The second lens has refractive power, and the second lens comprises a concave surface facing the object side. The third lens has refractive power, and the third lens comprises a convex surface facing the image side. The fourth lens has refractive power, and the fourth lens comprises a convex surface facing the image side. The fifth lens has refractive power. The sixth lens has positive refractive power, the sixth lens is a double convex lens, and comprises a convex surface facing the object side and another convex surface facing the image side. The first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are arranged in order from the object side to the image side along the optical axis. The imaging lens satisfies the condition: 87mm 2 ≤fLLxTTL≤111mm 2 Or the condition: 12 degrees / mm≤HFOV / fLL≤17 degrees / mm; wherein fLL is the effective focal length of the lens closest to the image side, TTL is the distance along the optical axis from the object side of the first lens to the imaging surface, and HFOV is the half field of view of the imaging lens.

[0005] The second lens is a double concave lens with negative refractive power, and can further comprise another concave surface facing the image side. The third lens is a double convex lens with positive refractive power, and can further comprise another convex surface facing the object side. The fourth lens is a double convex lens with refractive power, and can further comprise another convex surface facing the object side. The fifth lens is a meniscus lens with refractive power, and comprises a concave surface facing the object side and a convex surface facing the image side.

[0006] The imaging lens of the present application can further include a seventh lens disposed between the sixth lens and the image side, wherein the seventh lens is a biconvex lens having positive refractive power and includes one convex surface facing the object side and another convex surface facing the image side.

[0007] wherein the second lens is a biconcave lens having negative refractive power and can further include another concave surface facing the image side, the third lens is a biconvex lens having positive refractive power and can further include another convex surface facing the object side, the fourth lens is a biconvex lens and can further include another convex surface facing the object side, the fifth lens is a meniscus lens and includes one concave surface facing the object side and one convex surface facing the image side.

[0008] wherein the second lens is a meniscus lens having positive refractive power and can further include one convex surface facing the image side, the third lens is a meniscus lens having negative refractive power and can further include one concave surface facing the object side, the fourth lens is a biconvex lens and can further include another convex surface facing the object side, the fifth lens is a biconcave lens and includes one concave surface facing the object side and another concave surface facing the image side.

[0009] wherein the eighth lens is a meniscus lens having refractive power and includes one concave surface facing the object side and one convex surface facing the image side.

[0010] wherein the second lens is a biconcave lens and can further include another concave surface facing the image side, the third lens is a biconvex lens and can further include another convex surface facing the object side, the fourth lens is a meniscus lens having negative refractive power and can further include one concave surface facing the object side, the fifth lens is a biconvex lens and includes one convex surface facing the object side and another convex surface facing the image side.

[0011] wherein no air gap is included between the second lens and the third lens, the combination of the second lens and the third lens has positive refractive power, no air gap is included between the fifth lens and the eighth lens, the combination of the fifth lens and the eighth lens has positive refractive power.

[0012] wherein when an air gap is included between the fourth lens and the fifth lens, the fourth lens has positive refractive power and the fifth lens has negative refractive power; when no air gap is included between the fourth lens and the fifth lens, the combination of the fourth lens and the fifth lens has positive refractive power.

[0013] The imaging lens of the present application can further include a stop disposed between the third lens and the fifth lens, wherein the imaging lens satisfies at least one of the following conditions: -36.174 degrees / mm ≤ HFOV / f1 ≤ -23 degrees / mm; -22 ≤ fF / f ≤ -2; 0.16 ≤ BFL / TTL ≤ 0.19; 6.4 ≤ TTL / T4 ≤ 11.4; 0.5 < BFL / T3 < 1.7; -7 mm < f+f4 < 4 mm; 0.25 < f / fR < 0.38; 5 mm 2<|f1 x f5| < 12 mm 2 ; 2 mm < |R21 x R22 / f2| < 10 mm; 85 < Vd1 + Vd4 < 103; wherein HFOV is a half field of view of the imaging lens, TTL is a distance along the optical axis from an object side surface of the first lens to an imaging surface, BFL is a distance along the optical axis from an image side surface of the lens closest to the image side to the imaging surface, f is an effective focal length of the imaging lens, f1 is an effective focal length of the first lens, f2 is an effective focal length of the second lens, f4 is an effective focal length of the fourth lens, f5 is an effective focal length of the fifth lens, R21 is a curvature radius of the object side surface of the second lens, R22 is a curvature radius of the image side surface of the second lens, T3 is a distance along the optical axis from the object side surface of the third lens to the image side surface of the third lens, T4 is a distance along the optical axis from the object side surface of the fourth lens to the image side surface of the fourth lens, fF is a combined effective focal length of the lenses between the object side and the aperture, fR is a combined effective focal length of the lenses between the aperture and the image side, Vd1 is an Abbe number of the first lens, Vd4 is an Abbe number of the fourth lens.

[0014] The imaging lens according to the present application has the advantages of large field of view, short total length, high resolution, day and night focus, and good optical performance. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a lens configuration and optical path schematic diagram of a first embodiment of the imaging lens according to the present application.

[0016] Figure 2A , 2B , 2C is a longitudinal aberration diagram, a field curvature diagram, and a distortion diagram of the first embodiment of the imaging lens according to the present application.

[0017] Figure 3 is a lens configuration and optical path schematic diagram of a second embodiment of the imaging lens according to the present application.

[0018] Figure 4A , 4B , 4C is a longitudinal aberration diagram, a field curvature diagram, and a distortion diagram of the second embodiment of the imaging lens according to the present application.

[0019] Figure 5 is a lens configuration and optical path schematic diagram of a third embodiment of the imaging lens according to the present application.

[0020] Figure 6A , 6B , 6C is a longitudinal aberration diagram, a field curvature diagram, and a distortion diagram of the third embodiment of the imaging lens according to the present application.

[0021] Figure 7 FIG. 8B is a lens configuration and optical path schematic diagram of a fourth embodiment of the imaging lens according to the present application.

[0022] Figure 8A 8B FIG. 8C is a longitudinal aberration diagram, a field curvature diagram, and a distortion diagram of the fourth embodiment of the imaging lens according to the present application.

[0023] Figure 9 FIG. 10B is a lens configuration and optical path schematic diagram of a fifth embodiment of the imaging lens according to the present application.

[0024] Figure 10A 10B FIG. 10C is a longitudinal aberration diagram, a field curvature diagram, and a distortion diagram of the fifth embodiment of the imaging lens according to the present application. DETAILED DESCRIPTION

[0025] The present application provides an imaging lens, comprising: a first lens having negative refractive power, the first lens being a meniscus lens and comprising a convex surface facing an object side and a concave surface facing an image side; a second lens having refractive power, the second lens comprising a concave surface facing the object side; a third lens having refractive power, the third lens comprising a convex surface facing the image side; a fourth lens having refractive power, the fourth lens comprising a convex surface facing the image side; a fifth lens having refractive power; and a sixth lens having positive refractive power, the sixth lens being a double convex lens and comprising a convex surface facing the object side and another convex surface facing the image side; wherein one of the second lens and the third lens has positive refractive power; wherein one of the fourth lens and the fifth lens has positive refractive power; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are sequentially arranged along an optical axis from the object side to the image side; wherein the imaging lens satisfies the condition: 87mm 2 ≤ fLL x TTL ≤ 111mm 2 or the condition: 12 degrees / mm ≤ HFOV / fLL ≤ 17 degrees / mm; wherein fLL is an effective focal length of the lens closest to the image side, TTL is a distance along the optical axis from an object side surface of the first lens to an imaging surface, and HFOV is a half field of view of the imaging lens.

[0026] Please refer to Table 1, Table 2, Table 4, Table 5, Table 7, Table 8, Table 10, Table 11, Table 13, and Table 14 below, wherein Table 1, Table 4, Table 7, Table 10, and Table 13 are respectively a table of relevant parameters of each lens of the first embodiment to the fifth embodiment of the imaging lens according to the present application, and Table 2, Table 5, Table 8, Table 11, and Table 14 are respectively a table of relevant parameters of an aspheric surface of an aspheric lens in Table 1, Table 4, Table 7, Table 10, and Table 13.

[0027] Figure 1 3 ​​​, 5, 7, 9 are respectively the lens configuration and optical path schematic diagram of the first, second, third, fourth, fifth embodiments of the imaging lens of the present application. The first lens L11, L21, L31, L41, L51 is a meniscus lens with negative refractive power, which is made of glass material, the object side S11, S21, S31, S41, S51 is convex and is a spherical surface, the image side S12, S22, S32, S42, S52 is concave and is a spherical surface.

[0028] The second lens L12, L22, L32, L42, L52 is made of glass material, the object side S13, S23, S33, S43, S53 is concave, the object side S13, S23, S33, S43, S53 and the image side S14, S24, S34, S44, S54 are all spherical surfaces.

[0029] The third lens L13, L23, L33, L43, L53 is made of glass material, the image side S16, S26, S36, S46, S55 is convex, the object side S15, S25, S35, S45, S54 and the image side S16, S26, S36, S46, S55 are all spherical surfaces.

[0030] The fourth lens L14, L24, L34, L44, L54 is made of glass material, the image side S19, S28, S38, S49, S58 is convex, the object side S18, S27, S37, S48, S56 and the image side S19, S28, S38, S49, S57 are all spherical surfaces.

[0031] The fifth lens L15, L25, L35, L45, L55 has refractive power and is made of glass material, the object side S110, S28, S38, S49, S59 and the image side S111, S29, S39, S410, S510 are all spherical surfaces.

[0032] The sixth lens L16, L26, L36, L46, L56 is a double convex lens with positive refractive power, the object side S112, S210, S310, S411, S512 is convex, the image side S113, S211, S311, S412, S513 is convex.

[0033] The above design makes the imaging lens 1, 2, 3, 4, 5 effectively reduce the total length of the lens, effectively improve the resolution, effectively correct the aberration, and make the lens have the characteristics of day and night focusing, and the design of the spherical lens material being glass and the aspherical lens material being plastic helps to reduce the total length of the lens, improve the resolution, correct the aberration, and have the effect of day and night focusing. In addition, the imaging lens 1, 2, 3, 4, 5 can satisfy at least one of the following conditions:

[0034] -36.174 degrees / mm < HFOV / fl < -23 degrees / mm; (1)

[0035] 85 < Vdl + Vd4 < 103; (2)

[0036] -22 < fF / fl < -2; (3)

[0037] 0.16 < BFL / TTL < 0.19; (4)

[0038] 6.4 < TTL / T4 < 11.4; (5)

[0039] 0.5 < BFL / T3 < 1.7; (6)

[0040] -7 mm < f + f4 < 4 mm; (7)

[0041] 0.25 < fl / flR < 0.38; (8)

[0042] 5 mm 2 < | fl x f5 | < 12 mm 2 ; (9)

[0043] 2 mm < | R21 x R22 / fl2 | < 10 mm; (10)

[0044] 87 mm 2 < flL x TTL < 111 mm 2 ; (11)

[0045] 12 degrees / mm < HFOV / flL < 17 degrees / mm; (12)

[0046] wherein HFOV is a half field of view of the imaging lens 1, 2, 3, 4, 5 in the first embodiment to the fifth embodiment, TTL is a distance from an object side surface S11, S21, S31, S41, S51 of the first lens L11, L21, L31, L41, L51 to an imaging surface IMA1, IMA2, IMA3, IMA4, IMA5 along an optical axis OA1, OA2, OA3, OA4, OA5 in the first embodiment to the fifth embodiment, BFL is a distance from an image side surface S113, S213, S313, S414, S515 of the most image side lens L16, L27, L37, L47, L57 to the imaging surface IMA1, IMA2, IMA3, IMA4, IMA5 along the optical axis OA1, OA2, OA3, OA4, OA5 in the first embodiment to the fifth embodiment, f is an effective focal length of the imaging lens 1, 2, 3, 4, 5 in the first embodiment to the fifth embodiment, f1 is an effective focal length of the first lens L11, L21, L31, L41, L51 in the first embodiment to the fifth embodiment, f2 is an effective focal length of the second lens L12, L22, L32, L42, L52 in the first embodiment to the fifth embodiment, f4 is an effective focal length of the fourth lens L14, L24, L34, L44, L54 in the first embodiment to the fifth embodiment, f5 is an effective focal length of the fifth lens L15, L25, L35, L45, L55 in the first embodiment to the fifth embodiment, R21 is a radius of curvature of the object side surface S13, S23, S33, S43, S53 of the second lens L12, L22, L32, L42, L52 in the first embodiment to the fifth embodiment, R22 is a radius of curvature of the image side surface S14, S24, S34, S44, S54 of the second lens L12, L22, L32, L42, L52 in the first embodiment to the fifth embodiment, Vd1 is an Abbe number of the first lens L11, L21, L31, L41, L51 in the first embodiment to the fifth embodiment, Vd4 is an Abbe number of the fourth lens L14, L24, L34, L44, L54 in the first embodiment to the fifth embodiment, T3 is a distance from the object side surface S15, S25, S35, S45, S54 of the third lens L13, L23, L33, L43, L53 to the image side surface S16, S26, S36, S46, S55 of the third lens L13, L23, L33, L43, L53 along the optical axis OA1, OA2, OA3, OA4, OA5 in the first embodiment to the fifth embodiment, T4 is a distance from the object side surface S15, S25, S35, S45, S54 of the third lens L13, L23, L33, L43, L53 to the image side surface S16, S26, S36, S46, S55 of the fourth lens L14, L24, L34, L44, L54 along the optical axis OA1, OA2, OA3, OA4, OA5 in the first embodiment to the fifth embodiment, and T5 is a distance from the object side surface S16, S26, S36, S46, S55 of the third lens L13, L23, L33, L43, L53 to the image side surface S17, S27, S37, S47, S56 of the fourth lens L14, L24, L34, L44, L54 along the optical axis OA1, OA2, OA3, OA4, OA5 in the first embodiment to the fifth embodiment.The interval between the object side S18, S27, S37, S48, S56 of the fourth lens L14, L24, L34, L44, L54 and the image side S19, S28, S38, S49, S57 of the fourth lens L14, L24, L34, L44, L54 along the optical axis OA1, OA2, OA3, OA4, OA5, fF is the combined effective focal length of the lens between the object side and the aperture ST1, ST2, ST3, ST4, ST5 in the first embodiment to the fifth embodiment, fR is the combined effective focal length of the lens between the aperture ST1, ST2, ST3, ST4, ST5 and the image side in the first embodiment to the fifth embodiment, fLL is the effective focal length of the lens closest to the image side L16, L27, L37, L47, L57 in the first embodiment to the fifth embodiment.

[0047] When condition (1) -36.174 degrees / mm≤HFOV / f1≤-23 degrees / mm is satisfied, the first lens power can be effectively reduced, which is beneficial to the manufacturing of the first lens; when condition (2) 85≤Vd1+Vd4≤103 is satisfied, the aberration can be effectively reduced, and the image quality is improved; when condition (3) -22≤fF / f≤-2 is satisfied, the relative illumination of the imaging lens can be effectively improved; when condition (4) 0.16≤BFL / TTL≤0.19 is satisfied, the back focal length length can be effectively increased, which is beneficial to the manufacturing of the imaging lens; when condition (5) 6.4≤TTL / T4≤11.4 is satisfied, the influence of the environmental temperature on the image quality can be effectively reduced, and the manufacturing of the imaging lens is beneficial; when condition (6) 0.5 2 <|f1×f5|<12mm 2 When condition (9) 5mm 2 ≤fLL×TTL≤111mm 2 is satisfied, the field curvature can be effectively reduced, and the performance is improved; when condition (12) 12 degrees / mm≤HFOV / fLL≤17 degrees / mm is satisfied, the manufacturing of the lens closest to the image side is beneficial, and the performance is improved.

[0048] The first embodiment of the imaging lens of the present application will be described in detail. Please refer to Figure 1The imaging lens 1 includes a first lens L11, a second lens L12, a third lens L13, an aperture ST1, a fourth lens L14, a fifth lens L15, a sixth lens L16, an optical filter OF1 and a protective glass CG1. The first lens L11, the second lens L12, the third lens L13, the aperture ST1, the fourth lens L14, the fifth lens L15, the sixth lens L16, the optical filter OF1 and the protective glass CG1 are arranged in order from the object side to the image side along the optical axis OA1. During imaging, light rays from the object side are finally imaged on the imaging surface IMA1. According to the first to eighth paragraphs of the section of, wherein: the second lens L12 is a double-concave lens having a negative refractive power, and the image side S14 thereof is a concave surface; the third lens L13 is a double-convex lens having a positive refractive power, and the object side S15 thereof is a convex surface; the fourth lens L14 is a double-convex lens having a positive refractive power, and the object side S18 thereof is a convex surface; the fifth lens L15 is a meniscus lens having a negative refractive power, and the object side S110 thereof is a concave surface, and the image side S111 thereof is a convex surface; the sixth lens L16 is made of plastic material, and the object side S112 and the image side S113 thereof are aspheric surfaces; the object side S114 and the image side S115 of the optical filter OF1 and the object side S116 and the image side S117 of the protective glass CG1 are all flat surfaces; by using the above lenses, the aperture ST1 and the design satisfying at least one of the conditions (1) to (12), the imaging lens 1 can effectively reduce the total length of the lens, effectively improve the resolution, and effectively correct aberrations. Table 1 is a table of related parameters of each lens in the imaging lens 1. Figure 1

[0049] Table 1

[0050]

[0051] The aspheric surface sag z of the aspheric lens in Table 1 is obtained by the following formula:

[0052] 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

[0053] Wherein: c: curvature; h: vertical distance of any point on the lens surface to the optical axis; k: conic coefficient; A~F: aspheric coefficients.

[0054] Table 2 is a table of related parameters of the aspheric surface of the aspheric lens in Table 1.

[0055] Table 2​

[0056] Surface No. k A B C D E F S112 0 -1.32E-02 1.06E-03 -1.12E-03 8.39E-04 -5.53E-04 1.08E-04 S113 0 -2.36E-03 6.92E-04 -7.20E-05 -4.66E-05 -8.42E-05 2.39E-05

[0057] Table III shows the values of the related parameters of the imaging lens 1 of the first embodiment and the calculated values of the conditions (1) to (12) corresponding thereto. As can be seen from Table III, the imaging lens 1 of the first embodiment can satisfy the requirements of the conditions (1) to (12).

[0058] Table III

[0059]

[0060] In addition, the optical performance of the imaging lens 1 of the first embodiment can also meet the requirements. As can be seen from Table III, Figure 2A As can be seen from Table III, the longitudinal aberration of the imaging lens 1 of the first embodiment is between -0.03 mm and 0.01 mm. As can be seen from Table III, Figure 2B As can be seen from Table III, the field curvature of the imaging lens 1 of the first embodiment is between -0.04 mm and 0.02 mm. As can be seen from Table III, Figure 2C As can be seen from Table III, the distortion of the imaging lens 1 of the first embodiment is between -30% and 0%. It can be seen that the longitudinal aberration, the field curvature and the distortion of the imaging lens 1 of the first embodiment can be effectively corrected, thereby obtaining better optical performance.

[0061] Now the second embodiment of the imaging lens of the present application will be described in detail. Please refer to Figure 3The imaging lens 2 comprises a first lens L21, a second lens L22, a third lens L23, an aperture ST2, a fourth lens L24, a fifth lens L25, a sixth lens L26, a seventh lens L27, an optical filter OF2 and a cover glass CG2. The first lens L21, the second lens L22, the third lens L23, the fourth lens L24, the fifth lens L25, the sixth lens L26, the seventh lens L27, the optical filter OF2 and the cover glass CG2 are arranged in order from the object side to the image side along the optical axis OA2. The object side surface S27 of the fourth lens L24 is coated with a light blocking material to serve as the aperture ST2. During imaging, light rays from the object side are finally imaged on the imaging surface IMA2. According to the first to eighth paragraphs of the

DETAILED DESCRIPTION

[0062] Table 4

[0063]

[0064] The definition of the aspherical surface sag z of the aspherical lens in Table 4 is the same as that in the first embodiment, which is not described here again. Table 5 lists the parameters of the aspherical surfaces of the aspherical lens in Table 4.

[0065] Table 5

[0066] Surface No. k A B C D E F S212 0 -1.32E-02 1.06E-03 -1.12E-03 8.39E-04 -5.53E-04 1.08E-04 S213 0 -2.36E-03 6.92E-04 -7.20E-05 -4.66E-05 -8.42E-05 2.39E-05

[0067] Table 6 shows the relevant parameter values ​​of the imaging lens 2 in the second embodiment and the calculated values ​​of the corresponding conditions (1) to (12). As can be seen from Table 6, the imaging lens 2 in the second embodiment can meet the requirements of conditions (1) to (12).

[0068] Table 6

[0069]

[0070] Furthermore, the optical performance of the imaging lens 2 in the second embodiment also meets the requirements. Figure 4A It can be seen that the longitudinal aberration of the imaging lens 2 in the second embodiment is between -0.005mm and 0mm. Figure 4B It can be seen that the field curvature of the imaging lens 2 in the second embodiment is between -0.01mm and 0.02mm. Figure 4C It can be seen that the distortion of the imaging lens 2 in the second embodiment is between -20% and 0%. Clearly, the longitudinal aberration, field curvature, and distortion of the imaging lens 2 in the second embodiment can be effectively corrected, thereby achieving better optical performance.

[0071] The third embodiment of the imaging lens of the present invention will now be described in detail. Please refer to... Figure 5The imaging lens 3 includes a first lens L31, a second lens L32, a third lens L33, an aperture ST3, a fourth lens L34, a fifth lens L35, a sixth lens L36, a seventh lens L37, an optical filter OF3, and a protective glass CG3. The first lens L31, second lens L32, third lens L33, fourth lens L34, fifth lens L35, sixth lens L36, seventh lens L37, optical filter OF3, and protective glass CG3 are arranged sequentially along the optical axis OA3 from the object side to the image side. The object side surface S37 of the fourth lens L34 is coated with an opaque material to serve as the aperture ST3. During imaging, light rays from the object side are ultimately imaged onto the imaging plane IMA3. According to paragraphs one through eight of the [Specific Implementation], wherein: the second lens L32 is a biconcave lens with negative refractive power, and its image-side surface S34 is concave; the third lens L33 is a biconvex lens with positive refractive power, and its object-side surface S35 is convex; the fourth lens L34 is a biconvex lens with positive refractive power, and its object-side surface S37 is convex; the fifth lens L35 is a meniscus lens with negative refractive power, its object-side surface S38 is concave, and its image-side surface S39 is convex; the fourth lens L34 and the fifth lens L35 are cemented together or there is no air gap between them, and the cemented lens composed of the fourth lens L34 and the fifth lens L35 has positive refractive power and a focal length of 11.285mm; the sixth... Lens L36 is made of glass, and its object side S310 and image side S311 are both spherical surfaces; the seventh lens L37 has positive refractive power, is made of plastic, and its object side S312 is convex, its image side S313 is convex, and both object side S312 and image side S313 are aspherical surfaces; the filter OF3 has its object side S314 and image side S315, and the protective glass CG3 has its object side S316 and image side S317 both flat; by using the above lenses and the design that satisfies at least one of conditions (1) to (12), the imaging lens 3 can effectively reduce the total length of the lens, effectively improve the resolution, and effectively correct aberrations.

[0072] Table 7 is... Figure 5 Table of relevant parameters for each lens in the imaging lens 3.

[0073] Table 7

[0074]

[0075] The definition of the aspherical surface concavity z of the aspherical lens in Table 7 is the same as that in the first embodiment, and will not be repeated here.

[0076] Table 8 is a table of relevant parameters for the aspherical surface of the aspherical lens in Table 7.

[0077] Table 8

[0078] Surface No. k A B C D E F S312 0 -9.88E-03 -1.18E-03 4.15E-04 -8.58E-05 5.07E-04 -1.51E-04 S313 0 -1.61E-03 -5.93E-04 4.24E-04 4.92E-04 1.57E-04 -6.21E-05

[0079] Table 9 is the related parameter values of the imaging lens 3 of the third embodiment and the calculated values of the corresponding conditions (1) to (12). As can be seen from Table 9, the imaging lens 3 of the third embodiment can satisfy the requirements of the conditions (1) to (12).

[0080] Table 9

[0081]

[0082] In addition, the optical performance of the imaging lens 3 of the third embodiment can also meet the requirements. As can be seen from Table 9, Figure 6A As can be seen, the longitudinal aberration of the imaging lens 3 of the third embodiment is between -0.01 mm and 0.015 mm. As can be seen from Table 9, Figure 6B As can be seen, the field curvature of the imaging lens 3 of the third embodiment is between -0.03 mm and -0.005 mm. As can be seen from Table 9, Figure 6C As can be seen, the distortion of the imaging lens 3 of the third embodiment is between -20% and 0%. It is obvious that the longitudinal aberration, the field curvature and the distortion of the imaging lens 3 of the third embodiment can be effectively corrected, so that better optical performance is obtained.

[0083] Now the fourth embodiment of the imaging lens of the present application will be described in detail. Please refer to Figure 7The imaging lens 4 includes a first lens L41, a second lens L42, a third lens L43, an aperture ST4, a fourth lens L44, a fifth lens L45, a sixth lens L46, a seventh lens L47, an optical filter OF4, and a protective glass CG4. The first lens L41, the second lens L42, the third lens L43, the aperture ST4, the fourth lens L44, the fifth lens L45, the sixth lens L46, the seventh lens L47, the optical filter OF4, and the protective glass CG4 are arranged in order from the object side to the image side along the optical axis OA4. During imaging, light rays from the object side are finally imaged on the imaging surface IMA4. According to the first to eighth paragraphs of the

DETAILED DESCRIPTION

[0084] Table X

[0085]

[0086] The definition of the aspherical surface sag z of the aspherical lenses in Table X is the same as that of the first embodiment, and is not described here.

[0087] Table XI is a table of related parameters of the aspherical surfaces of the aspherical lenses in Table X.

[0088] Table XI

[0089] Surface No. k A B C D E F S413 0 -1.32E-02 1.06E-03 -1.12E-03 8.39E-04 -5.53E-04 1.08E-04 S414 0 -2.36E-03 6.92E-04 -7.20E-05 -4.66E-05 -8.42E-05 2.39E-05

[0090] Table XII lists the related parameter values of the imaging lens 4 of the fourth embodiment and the calculated values of the conditions (1) to (12) corresponding thereto. As can be seen from Table XII, the imaging lens 4 of the fourth embodiment can satisfy the requirements of the conditions (1) to (12).

[0091] Table XII

[0092]

[0093] In addition, the optical performance of the imaging lens 4 of the fourth embodiment can also meet the requirements. As can be seen from Table XII, Figure 8A As can be seen, the longitudinal aberration of the imaging lens 4 of the fourth embodiment is between -0.005 mm and 0 mm. As can be seen from Table XII, Figure 8B As can be seen, the field curvature of the imaging lens 4 of the fourth embodiment is between -0.04 mm and 0 mm. As can be seen from Table XII, Figure 8C As can be seen, the distortion of the imaging lens 4 of the fourth embodiment is between -20% and 0%. It is obvious that the longitudinal aberration, the field curvature and the distortion of the imaging lens 4 of the fourth embodiment can be effectively corrected, thereby obtaining better optical performance.

[0094] Now the fifth embodiment of the imaging lens of the present application will be described in detail. Please refer to Figure 9The imaging lens 5 includes a first lens L51, a second lens L52, a third lens L53, a fourth lens L54, an aperture ST5, a fifth lens L55, an eighth lens L58, a sixth lens L56, a seventh lens L57, an optical filter OF5, and a protective glass CG5. The first lens L51, the second lens L52, the third lens L53, the fourth lens L54, the aperture ST5, the fifth lens L55, the eighth lens L58, the sixth lens L56, the seventh lens L57, the optical filter OF5, and the protective glass CG5 are arranged in order from the object side to the image side along the optical axis OA5. During imaging, light rays from the object side are finally imaged on the imaging surface IMA5. According to the first to eighth paragraphs of the, wherein: the second lens L52 is a double-concave lens having negative refractive power, and the image side S54 thereof is a concave surface; the third lens L53 is a double-convex lens having positive refractive power, and the object side S54 thereof is a convex surface; the second lens L52 and the third lens L53 are cemented or have no air gap therebetween, and the cemented lens composed of the second lens L52 and the third lens L53 has positive refractive power, and a focal length thereof is 8.718 mm; the fourth lens L54 is a meniscus lens having negative refractive power, and the object side S56 thereof is a concave surface; the fifth lens L55 has positive refractive power, the object side S59 thereof is a convex surface, and the image side S510 thereof is a convex surface; the eighth lens L58 is a meniscus lens having negative refractive power, is made of glass, the object side S510 thereof is a concave surface, the image side S511 thereof is a convex surface, and both the object side S510 and the image side S511 are spherical surfaces; the fifth lens L55 and the eighth lens L58 are cemented or have no air gap therebetween, and the cemented lens composed of the fifth lens L55 and the eighth lens L58 has positive refractive power, and a focal length thereof is 7.497 mm; the sixth lens L56 is made of glass, and both the object side S512 and the image side S513 thereof are spherical surfaces; the seventh lens L57 is a double-convex lens having positive refractive power, is made of plastic, the object side S514 thereof is a convex surface, the image side S515 thereof is a convex surface, and both the object side S514 and the image side S515 are aspherical surfaces; the optical filter OF5 has both the object side S516 and the image side S517 thereof as flat surfaces; the protective glass CG5 has both the object side S518 and the image side S519 thereof as flat surfaces; by using the above lenses, the aperture ST5, and a design satisfying at least one of conditions (1) to (12), the imaging lens 5 can effectively reduce the total track length, effectively improve the resolution, and effectively correct aberrations.

[0095] Table XIII is a table of parameters of the lenses of the imaging lens 5. Figure 9

[0096]

[0097]

[0098] ​​The definition of the aspherical surface sag z of the aspherical lens in Table XIII is the same as that of the aspherical lens in Table I of the first embodiment, and is not described here again. Table XIV is a table of the related parameters of the aspherical surface of the aspherical lens in Table XIII.

[0099] Table XIV

[0100] Surface No. k A B C D E F S514 0 -1.32E-02 1.06E-03 -1.12E-03 8.39E-04 -5.53E-04 1.08E-04 S515 0 -2.36E-03 6.92E-04 -7.20E-05 -4.66E-05 -8.42E-05 2.39E-05

[0101] Table XV is a table of the related parameter values of the imaging lens 5 of the fifth embodiment and the calculated values of the conditions (1) to (12) corresponding thereto. As can be seen from Table XV, the imaging lens 5 of the fifth embodiment can satisfy the requirements of the conditions (1) to (12).

[0102] Table XV

[0103]

[0104] In addition, the optical performance of the imaging lens 5 of the fifth embodiment can also meet the requirements. As can be seen from Figure 10A It can be seen that the longitudinal aberration of the imaging lens 5 of the fifth embodiment is between -0.005 mm and 0 mm. As can be seen from Figure 10B It can be seen that the field curvature of the imaging lens 5 of the fifth embodiment is between -0.03 mm and 0.02 mm. As can be seen from Figure 10C It can be seen that the distortion of the imaging lens 5 of the fifth embodiment is between -20% and 0%. It is obvious that the longitudinal aberration, field curvature, and distortion of the imaging lens 5 of the fifth embodiment can be effectively corrected, thereby obtaining better optical performance.

[0105] The sixth embodiment of the imaging lens of the present application is explained in detail. The lens configuration and the optical path schematic diagram of the imaging lens of the sixth embodiment are similar to the first embodiment, so the diagram thereof is omitted, the difference is that the fourth lens and the fifth lens of the imaging lens are cemented, the fourth lens and the fifth lens of the imaging lens 1 are not cemented, but the following contents about the sixth embodiment will still continue to use the component symbols of the sixth embodiment for convenience of explanation. The imaging lens comprises a first lens L61, a second lens L62, a third lens L63, an aperture ST6, a fourth lens L64, a fifth lens L65, a sixth lens L66, a filter OF6 and a protection glass CG6. The first lens L61, the second lens L62, the third lens L63, the aperture ST6, the fourth lens L64, the fifth lens L65, the sixth lens L66, the filter OF6 and the protection glass CG6 are arranged in order from the object side to the image side along the optical axis OA6. During imaging, the light rays from the object side are finally imaged on the imaging surface IMA6. According to the first to eighth paragraphs of the

DETAILED DESCRIPTION

[0106] Table sixteen

[0107]

[0108] The definition of the aspheric surface sag z of the aspheric lenses in Table sixteen is the same as the definition of the aspheric surface sag z of the aspheric lenses in Table one of the first embodiment, which will not be repeated here.

[0109] Table seventeen is a table of related parameters of the aspheric surfaces of the aspheric lenses in Table sixteen.

[0110] Table seventeen

[0111]

[0112]

[0113] The seventh embodiment of the imaging lens of the present application is explained in detail. The lens configuration and optical path schematic diagram of the imaging lens 7 (not shown) of the seventh embodiment is similar to the first embodiment, thus the diagram is omitted, the difference is that the fourth lens and the fifth lens of the imaging lens are cemented, the fourth lens and the fifth lens of the imaging lens 1 are not cemented, but the following content about the seventh embodiment will still continue to use the component symbol of the seventh embodiment for convenience of explanation. The imaging lens comprises a first lens L71, a second lens L72, a third lens L73, a stop ST7, a fourth lens L74, a fifth lens L75, a sixth lens L76, an optical filter OF7 and a cover glass CG7. The first lens L71, the second lens L72, the third lens L73, the stop ST7, the fourth lens L74, the fifth lens L75, the sixth lens L76, the optical filter OF7 and the cover glass CG7 are arranged in order from the object side to the image side along the optical axis OA7. During imaging, the light rays from the object side are finally imaged on the imaging surface IMA7. According to the first to eighth paragraphs of the

DETAILED DESCRIPTION

[0114] Table eighteen

[0115]

[0116]

[0117] The definition of the aspherical surface sagitta z of the aspherical lens in Table eighteen is the same as the definition of the aspherical surface sagitta z of the aspherical lens in Table one of the first embodiment, which will not be repeated here.

[0118] Table 19 is a table of the aspherical surface parameters of the aspherical surface of the aspherical lens of Table 18.

[0119] Table 19

[0120] Surface No. k A B C D E F S711 0 -1.32E-02 1.06E-03 -1.12E-03 8.39E-04 -5.53E-04 1.08E-04 S712 0 -2.36E-03 6.92E-04 -7.20E-05 -4.66E-05 -8.42E-05 2.39E-05

[0121] While the application has been described by way of example with reference to specific embodiments, it is to be understood that the application is not limited to the particulars of those embodiments. Instead, many modifications and other embodiments, both to the general principles and the application itself, will be apparent to those skilled in the art. It is therefore contemplated to cover any and all modifications and variations within the scope of the application.

Claims

1. An imaging lens, characterized in that, consisting of six to eight lenses, wherein: a first lens has negative refractive power, the first lens is a meniscus lens, and includes a convex surface facing an object side and a concave surface facing an image side; a second lens has refractive power, the second lens includes a concave surface facing the object side; a third lens has refractive power, the third lens includes a convex surface facing the image side; a fourth lens has refractive power, the fourth lens includes a convex surface facing the image side; a fifth lens has refractive power; and a sixth lens has positive refractive power, the sixth lens is a biconvex lens, and includes a convex surface facing the object side and another convex surface facing the image side; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are arranged in order from the object side to the image side along an optical axis; wherein the imaging lens satisfies at least one of the following conditions: 12 degrees / mm < HFOV / fLL < 17 degrees / mm; -36.174 degrees / mm < HFOV / f1 < -23 degrees / mm; 0.16 < BFL / TTL < 0.19; -7 mm < f + f4 < 4 mm; 5mm 2 <|f1xf5| < 12mm 2 ; 2 mm < |R21 x R22 / f2| < 10 mm; wherein fLL is an effective focal length of a lens closest to the image side, TTL is a distance from an object side surface of the first lens to an imaging surface along the optical axis, HFOV is a half field of view of the imaging lens, BFL is a distance from an image side surface of a lens closest to the image side to the imaging surface along the optical axis, f is an effective focal length of the imaging lens, f1 is an effective focal length of the first lens, f4 is an effective focal length of the fourth lens, f5 is an effective focal length of the fifth lens, R21 is a radius of curvature of the object side surface of the second lens, R22 is a radius of curvature of the image side surface of the second lens, and f2 is an effective focal length of the second lens.

2. The imaging lens of claim 1, wherein: the second lens is a biconcave lens having negative refractive power, and further includes another concave surface facing the image side; the third lens is a biconvex lens having positive refractive power, and further includes another convex surface facing the object side; the fourth lens is a biconvex lens having refractive power, and further includes another convex surface facing the object side; and the fifth lens is a meniscus lens having refractive power, and includes a concave surface facing the object side and a convex surface facing the image side.

3. The imaging lens of claim 1, wherein, a seventh lens is disposed between the sixth lens and the image side, wherein the seventh lens is a biconvex lens having positive refractive power, and includes a convex surface facing the object side and another convex surface facing the image side.

4. The imaging lens of claim 3, wherein: the second lens is a biconcave lens having negative refractive power, and further includes another concave surface facing the image side; the third lens is a biconvex lens having positive refractive power, and further includes another convex surface facing the object side; the fourth lens is a biconvex lens, and further includes another convex surface facing the object side; and the fifth lens is a meniscus lens, and includes a concave surface facing the object side and a convex surface facing the image side.

5. The imaging lens of claim 3, wherein: the second lens is a meniscus lens having positive refractive power, and further includes a convex surface facing the image side; The third lens is a meniscus lens with negative refractive power, and further includes a concave surface facing the object side; The fourth lens is a biconvex lens, and further includes another convex surface facing the object side; and The fifth lens is a biconcave lens, and includes a concave surface facing the object side and another concave surface facing the image side.

6. The imaging lens of claim 3, wherein, Further including an eighth lens disposed between the fifth lens and the sixth lens, wherein the eighth lens is a meniscus lens with negative refractive power, and includes a concave surface facing the object side and a convex surface facing the image side.

7. The imaging lens of claim 6, wherein: The second lens is a biconcave lens, and further includes another concave surface facing the image side; The third lens is a biconvex lens, and further includes another convex surface facing the object side; The fourth lens is a meniscus lens with negative refractive power, and further includes a concave surface facing the object side; and The fifth lens is a biconvex lens, and includes a convex surface facing the object side and another convex surface facing the image side.

8. The imaging lens of claim 7, wherein: There is no air gap between the second lens and the third lens, the combination of the second lens and the third lens has positive refractive power; and There is no air gap between the fifth lens and the eighth lens, the combination of the fifth lens and the eighth lens has positive refractive power.

9. The imaging lens of any one of claims 1 to 5, wherein, When there is an air gap between the fourth lens and the fifth lens, the fourth lens has positive refractive power and the fifth lens has negative refractive power; when there is no air gap between the fourth lens and the fifth lens, the combination of the fourth lens and the fifth lens has positive refractive power.

10. The imaging lens of any one of claims 1 to 8, wherein, Further including a stop disposed between the third lens and the fifth lens, wherein the imaging lens satisfies at least one of the following conditions: -22 < fF / f < -2; 6.4 < TTL / T4 < 11.4; 0.5 < BFL / T3 < 1.7; 0.25 < f / fR < 0.38; 85 < Vd1+Vd4 < 103; 87 mm 2 ≤ fLL x TTL ≤ 111 mm 2 ; wherein TTL is the distance along the optical axis from the object side surface of the first lens to the image plane, BFL is the distance along the optical axis from the image side surface of the lens closest to the image side to the image plane, T3 is the distance along the optical axis from the object side surface of the third lens to the image side surface of the third lens, T4 is the distance along the optical axis from the object side surface of the fourth lens to the image side surface of the fourth lens, fF is the combined effective focal length of the lenses between the object side and the stop, fR is the combined effective focal length of the lenses between the stop and the image side, Vd1 is the Abbe number of the first lens, Vd4 is the Abbe number of the fourth lens, and fLL is the effective focal length of the lens closest to the image side.

Images