Image capturing optical lens

Abstract

To provide an optical lens, in particular, an image capturing optical lens.SOLUTION: An image capturing optical lens provided herein comprises a first lens having positive refractive power, a second lens having negative refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power, arranged in order from the object side to the image side, and satisfies the following conditional expressions: -0.25≤f12 / f34567≤0.05, 0.13≤|TEP / SAG11|*(f / R1)≤2.80, 0.15≤SZD1 / HZD1≤0.30, 0.07≤SZD2 / HZD2≤0.25.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the field of optical lenses, and more particularly to an imaging optical lens that is applied to mobile terminal devices such as smartphones and digital cameras, and imaging devices such as monitors, PC lenses, and in-vehicle lenses. [Background technology]

[0002] In recent years, with the rise of various smart devices, the demand for miniaturized imaging optical lenses has been increasing. In addition to the reduction in pixel size of photosensitive elements, current electronic products tend to be lightweight and portable, so miniaturized imaging optical lenses with good imaging quality have become the mainstream in the current market. To achieve good imaging quality, multi-lens structures are often adopted. Furthermore, with technological development and the increasing diversification of user needs, the pixel area of ​​photosensitive elements is shrinking, and the system requirements for imaging quality are increasing. Therefore, seven-lens structures are gradually appearing in lens designs. There is a growing demand for optical imaging lenses with excellent optical properties, small aberration, high light transmission, good processability, and low assembly sensitivity. Summary of the Invention [Problem to be solved by the invention]

[0003] In view of the above problems, an object of the present invention is to provide an imaging optical lens that has good optical characteristics, and also satisfies the design requirements of small aberration, a large amount of light passing through, good processability, and low assembly sensitivity. [Means for solving the problem]

[0004] In order to achieve the above object, the technical solution of the present invention provides an imaging optical lens composed of an aperture stop and seven lenses, the seven lenses being, in order from the object side to the image side, a first lens having positive refractive power, a second lens having negative refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power; a composite focal length of the first lens and the second lens is f12, a composite focal length of the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens is f34567, a distance along the optical axis direction from the aperture stop to the center of the object side surface of the first lens is TEP, a height of an arrow at a maximum optical radius of the object side surface of the first lens is SAG11, a focal length of the imaging optical lens is f, a central radius of curvature of the object side surface of the first lens in the paraxial direction is R1, both the object side surface and the image side surface of the sixth lens include at least one critical point, a critical point on the object side surface of the sixth lens closest to the optical axis is a first object-side critical point, a vertical distance from the first object-side critical point to the optical axis is HZD1, and a vertical distance from the first object-side critical point to the optical axis is HZD2. the arrow height of the point is SZD1, the critical point closest to the optical axis on the image side surface of the sixth lens is a first image side critical point, the vertical distance from the first image side critical point to the optical axis is HZD2, the arrow height of the first image side critical point is SZD2, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, the axial distance between the image side surface of the first lens and the object side surface of the second lens is d2, the axial distance between the image side surface of the second lens and the object side surface of the third lens is d4, the axial distance between the image side surface of the third lens and the object side surface of the fourth lens is d6, the arrow height at the maximum optical radius of the object side surface of the fifth lens is SAG51, and the axial distance between the image side surface of the fourth lens and the object side surface of the fifth lens is d8, and the following relational expressions (1) to (7) are satisfied. -0.25≦f12 / f34567≦0.05 (1) 0.13≦|TEP / SAG11|*(f / R1)≦2.80 (2) 0.15≦SZD1 / HZD1≦0.30 (3) 0.07≦SZD2 / HZD2≦0.25 (4) -5.00≦(f5-f6) / f≦-1.40 (5) 1.20≦d4 / (d2+d6)≦2.00 (6) -1.50≦SAG51 / d8≦-0.90 (7)

[0005] Preferably, the following relational expression (8) is satisfied. -0.21≦f12 / f34567≦0.04 (8)

[0006] Preferably, the following relational expression (9) is satisfied. 0.15≦|TEP / SAG11|*(f / R1)≦2.50 (9)

[0007] Preferably, the following relational expression (10) is satisfied. 0.18≦SZD1 / HZD1≦0.25 (10)

[0008] Preferably, the following relational expression (11) is satisfied. 0.08≦SZD2 / HZD2≦0.22 (11)

[0009] Preferably, the following relational expression (12) is satisfied. -4.40≦(f5-f6) / f≦-1.70 (12)

[0010] Preferably, the following relational expression (13) is satisfied. 1.30≦d4 / (d2+d6)≦1.85 (13)

[0011] Preferably, the following relational expression (14) is satisfied. -1.25≦SAG51 / d8≦-0.95 (14)

[0012] Preferably, the arrow height at the maximum optical radius of the object side surface of the sixth lens is SAG61, the arrow height at the maximum optical radius of the image side surface of the sixth lens is SAG62, the axial thickness of the sixth lens is d11, and the following relational expression (15) is satisfied. 0.20≦(SAG61-SAG62) / d11≦0.50 (15)

[0013] Preferably, the following relational expression (16) is satisfied. 0.23≦(SAG61-SAG62) / d11≦0.45 (16)

[0014] Preferably, the paraxial central radius of curvature of the object side surface of the second lens is R3, the paraxial central radius of curvature of the image side surface of the fifth lens is R10, and the following relational expression (17) is satisfied: 0.28≦R3 / R10≦2.65 (17)

[0015] Preferably, the following relational expression (18) is satisfied. 0.33≦R3 / R10≦2.28 (18)

[0016] Preferably, the first lens is made of a glass material.

[0017] In order to achieve the above object, the technical solution of the present invention further provides an imaging optical lens composed of an aperture stop and seven lenses, the seven lenses being, in order from the object side to the image side, a first lens having positive refractive power, a second lens having negative refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power; a composite focal length of the first lens and the second lens is f12, a composite focal length of the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens is f34567, a distance from the aperture stop to the center of the object side surface of the first lens along the optical axis direction is TEP, a arrow height at the maximum optical radius of the object side surface of the first lens is SAG11, a focal length of the imaging optical lens is f, a central radius of curvature at the paraxial direction of the object side surface of the first lens is R1, the object side surface and the image side surface of the sixth lens each include at least one critical point, a critical point on the object side surface of the sixth lens closest to the optical axis is a first object-side critical point, a vertical distance from the first object-side critical point to the optical axis is HZD1, a arrow height of the first object-side critical point is SZD1, and a critical point on the image side surface of the sixth lens closest to the optical axis is a first image-side critical point. a vertical distance from the first image-side critical point to the optical axis is HZD2; an arrow height of the first image-side critical point is SZD2; both the object-side and image-side surfaces of the sixth lens include at least one inflection point; the object-side surface of the sixth lens includes a first object-side inflection point closest to the optical axis and a second object-side inflection point other than the first object-side inflection point; a vertical distance from the first object-side inflection point to the optical axis is HFD1; The arrow height of the inflection point is SFD1, the vertical distance from the second object-side inflection point to the optical axis is HFD2, the arrow height of the second object-side inflection point is SFD2, the image side surface of the sixth lens includes a first image-side inflection point closest to the optical axis, the vertical distance from the first image-side inflection point to the optical axis is HFD3, and the arrow height of the first image-side inflection point is SFD3, and the following relational expressions (1) to (4) and relational expressions (19) to (21) are satisfied. -0.25≦f12 / f34567≦0.05 (1) 0.13≦|TEP / SAG11|*(f / R1)≦2.80 (2) 0.15≦SZD1 / HZD1≦0.30 (3) 0.07≦SZD2 / HZD2≦0.25 (4) 0.15≦SFD1 / HFD1≦0.28 (19) -0.12≦SFD2 / HFD2≦0.002 (20) 0.10≦SFD3 / HFD3≦0.45 (21)

[0018] Preferably, the following relational expression (8) is satisfied. -0.21≦f12 / f34567≦0.04 (8)

[0019] Preferably, the following relational expression (9) is satisfied. 0.15≦|TEP / SAG11|*(f / R1)≦2.50 (9)

[0020] Preferably, the following relational expression (10) is satisfied. 0.18≦SZD1 / HZD1≦0.25 (10)

[0021] Preferably, the following relational expression (11) is satisfied. 0.08≦SZD2 / HZD2≦0.22 (11)

[0022] Preferably, the following relational expression (22) is satisfied. 0.18≦SFD1 / HFD1≦0.25 (22)

[0023] Preferably, the following relational expression (23) is satisfied. -0.10≦SFD2 / HFD2≦0.002 (23)

[0024] Preferably, the following relational expression (24) is satisfied. 0.11≦SFD3 / HFD3≦0.38 (24)

[0025] Preferably, the focal length of the sixth lens is f6, the on-axis thickness of the sixth lens is d11, and the following relational expression (25) is satisfied. 6.58≦f6 / d11≦11.78 (25)

[0026] Preferably, the following relational expression (26) is satisfied. 7.69≦f6 / d11≦9.85 (26)

[0027] Preferably, the first lens is made of a glass material. [Effects of the Invention]

[0028] The beneficial effects of the present invention are as follows: The imaging optical lens according to the present invention has excellent optical properties, including small aberration, a large amount of light passing through, good processability, an aperture stop with low assembly sensitivity, a wide angle, and an extremely thin design, and is particularly applicable to imaging lens assemblies for mobile phones, web imaging lenses, and vehicle-mounted lenses, which are configured with imaging elements such as high-pixel CCDs and CMOSs.

[0029] In order to more clearly explain the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for the embodiments. Obviously, the drawings described below are only some embodiments of the present invention, and those skilled in the art can further obtain other drawings based on these drawings without any creative work. [Brief explanation of the drawings]

[0030] [Figure 1] 1 is a schematic diagram showing the configuration of an imaging optical lens according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a schematic diagram of on-axis aberration of the imaging optical lens shown in FIG. [Figure 3] FIG. 2 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in FIG. [Figure 4] 2A to 2C are schematic diagrams of field curvature and distortion of the imaging optical lens shown in FIG. [Figure 5] FIG. 4 is a schematic diagram showing the configuration of an imaging optical lens according to a second embodiment of the present invention. [Figure 6] FIG. 6 is a schematic diagram of on-axis aberration of the imaging optical lens shown in FIG. [Figure 7] FIG. 6 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in FIG. 5. [Figure 8] 6A and 6B are schematic diagrams of field curvature and distortion of the imaging optical lens shown in FIG. 5. [Figure 9] FIG. 10 is a schematic diagram showing the configuration of an imaging optical lens according to a third embodiment of the present invention. [Figure 10] 10 is a schematic diagram of the on-axis aberration of the imaging optical lens shown in FIG. [Figure 11]FIG. 10 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in FIG. [Figure 12] 10A and 10B are schematic diagrams of field curvature and distortion of the imaging optical lens shown in FIG. [Figure 13] FIG. 10 is a schematic diagram showing the configuration of an imaging optical lens according to a fourth embodiment of the present invention. [Figure 14] 14 is a schematic diagram of on-axis aberration of the imaging optical lens shown in FIG. 13. [Figure 15] FIG. 14 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in FIG. [Figure 16] 14A to 14C are schematic diagrams of field curvature and distortion of the imaging optical lens shown in FIG. 13. [Figure 17] FIG. 10 is a schematic diagram showing the configuration of an imaging optical lens according to a fifth embodiment of the present invention. [Figure 18] 18 is a schematic diagram of the on-axis aberration of the imaging optical lens shown in FIG. 17. [Figure 19] 18 is a schematic diagram of chromatic aberration of magnification of the imaging optical lens shown in FIG. 17. [Figure 20] 18A and 18B are schematic diagrams of field curvature and distortion of the imaging optical lens shown in FIG. 17. DETAILED DESCRIPTION OF THE INVENTION

[0031] In order to make the objectives, solutions, and advantages of the present invention clearer, the following detailed description of each embodiment of the present invention will be given with reference to the accompanying drawings. It will be understood by those skilled in the art that many technical details are provided in each embodiment of the present invention to better understand the present invention. However, the technical solution to be protected by the present invention can be realized without these technical details and various changes and modifications based on the following embodiments.

[0032] As shown in Figures 1 to 20, the technical solution of the present invention provides imaging optical lenses 10, 20, 30, 40, and 50. Figures 1, 5, 9, 13, and 17 show imaging optical lenses 10, 20, 30, 40, and 50 according to the present invention, each of which includes a total of seven lenses. Specifically, the imaging optical lens includes, in order from the object side to the image side, an aperture stop S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. An optical element such as an optical filter GF may be provided between the seventh lens L7 and the image plane Si.

[0033] The first lens L1 is made of glass, the second lens L2 is made of plastic, the third lens L3 is made of plastic, the fourth lens L4 is made of plastic, the fifth lens L5 is made of plastic, the sixth lens L6 is made of plastic, and the seventh lens L7 is made of plastic, although each lens may be made of other materials.

[0034] The object-side and image-side surfaces of the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6 and seventh lens L7 are all aspheric.

[0035] The refractive powers of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are positive, negative, negative, positive, negative, positive, and negative, respectively. The first lens L1 has a convex object-side surface and a concave image-side surface. The second lens L2 has a convex object-side surface and a concave image-side surface. The third lens L3 has a concave image-side surface, and the object-side surface of the third lens L3 may be either a concave or convex surface. The fourth lens L4 has a convex object-side surface and a convex image-side surface. The image-side surface of the fifth lens L5 is a concave surface, and the object-side surface of the fifth lens L5 may be either a concave or convex surface. The object-side surface of the sixth lens L6 is a convex surface, and the image-side surface of the sixth lens L6 may be either a concave or convex surface. The image side surface of the seventh lens L7 is a concave surface, and the object side surface of the seventh lens L7 may be either a concave surface or a convex surface.

[0036] When the composite focal length of the first lens L1 and the second lens L2 is f12 and the composite focal length of the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 is f34567, the following relationship is satisfied: -0.25≦f12 / f34567≦0.05. Furthermore, the following relationship is satisfied: -0.21≦f12 / f34567≦0.04. By rationally setting the proportional relationship between the composite focal length of the first lens L1 and the second lens L2 and the composite focal lengths of the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 within the range of this relationship, it is advantageous to rationally distribute the refractive power of each lens in space and reduce aberrations in the optical system.

[0037] Let TEP be the distance along the optical axis from the aperture stop to the center of the object-side surface of the first lens L1, SAG11 be the arrow height at the maximum optical radius of the object-side surface of the first lens L1, f be the focal length of the imaging optical lens, and R1 be the central radius of curvature of the object-side surface of the first lens L1 in the paraxial direction. The following relationship is satisfied: 0.13≦|TEP / SAG11|*(f / R1)≦2.80. Furthermore, the following relationship is satisfied: 0.15≦|TEP / SAG11|*(f / R1)≦2.50. By rationally controlling the position of the aperture stop and the arrow height of the object-side surface of the first lens within the range of this relationship, the imaging optical lens can have a high amount of incident light and the object-side surface of the first lens can have a reasonable curvature, which is beneficial to improving processing yield and controlling the focal length of the system within an appropriate range.

[0038] When the critical point on the object-side surface of sixth lens L6 closest to the optical axis is defined as the first object-side critical point, the vertical distance from the first object-side critical point to the optical axis is defined as HZD1, and the arrow height of the first object-side critical point is defined as SZD1, the relationship 0.15≦SZD1 / HZD1≦0.30 is satisfied. Furthermore, the relationship 0.18≦SZD1 / HZD1≦0.25 is satisfied. The shape of the object-side surface of the sixth lens, particularly the ratio of the arrow height to the height of the first off-axis critical point, can be reasonably controlled within the range of this relationship, which is advantageous for correcting aberrations by the first to fifth lenses.

[0039] Let the critical point on the image side of the sixth lens L6 closest to the optical axis be the first image side critical point, the vertical distance from the first image side critical point to the optical axis be HZD2, and the arrow height of the first image side critical point be SZD2. The relationship 0.07≦SZD2 / HZD2≦0.25 is satisfied. Furthermore, the relationship 0.08≦SZD2 / HZD2≦0.22 is satisfied. Rationally controlling the shape of the image side of the sixth lens, particularly the ratio of the arrow height to the height of the first off-axis critical point, within the range of this relationship is beneficial to adjusting the direction of light rays after they pass through, making the transition of light rays between the sixth lens and the seventh lens gentler, and reducing assembly sensitivity between the sixth lens and the seventh lens.

[0040] When the focal length of the fifth lens L5 is f5 and the focal length of the sixth lens L6 is f6, the relationship -5.00≦(f5-f6) / f≦-1.40 is satisfied. Furthermore, the relationship -4.40≦(f5-f6) / f≦-1.70 is satisfied. The spherical aberration caused by the fifth lens and the sixth lens can be balanced within the range of the relationship.

[0041] When the axial distance between the image-side surface of the first lens L1 and the object-side surface of the second lens L2 is d2, the axial distance between the image-side surface of the second lens L2 and the object-side surface of the third lens L3 is d4, and the axial distance between the image-side surface of the third lens L3 and the object-side surface of the fourth lens L4 is d6, the following relationship is satisfied: 1.20≦d4 / (d2+d6)≦2.00. Furthermore, the following relationship is satisfied: 1.30≦d4 / (d2+d6)≦1.85. By rationally setting the air spacing between the first to fourth lenses within the range of this relationship, the peripheral structure of the lenses, particularly the thickness of the peripheral portions, can be rationally designed, allowing for more diverse designs for the connection structure between the lenses.

[0042] When the arrow height at the maximum optical radius of the object-side surface of the fifth lens L5 is SAG51 and the axial distance between the image-side surface of the fourth lens L4 and the object-side surface of the fifth lens L5 is d8, the following relationship is satisfied: -1.50≦SAG51 / d8≦-0.90. Furthermore, the following relationship is satisfied: -1.25≦SAG51 / d8≦-0.95. The axial distance between the fourth lens and the fifth lens and the arrow height at the maximum optical radius of the object-side surface of the fifth lens are reasonably controlled within the range of this relationship, thereby avoiding interference between the fourth lens and the fifth lens.

[0043] When the arrow height at the maximum optical radius of the object-side surface of sixth lens L6 is SAG61, the arrow height at the maximum optical radius of sixth lens L6 at the image-side surface is SAG62, and the axial thickness of sixth lens L6 is d11, the relationship 0.20≦(SAG61−SAG62) / d11≦0.50 is satisfied. Furthermore, the relationship 0.23≦(SAG61−SAG62) / d11≦0.45 is satisfied. The shape of the sixth lens is reasonably controlled within the range of the relationship, improving processability.

[0044] When the central radius of curvature of the object-side surface of the second lens L2 at the paraxial position is R3 and the central radius of curvature of the image-side surface of the fifth lens L5 at the paraxial position is R10, the following relationship is satisfied: 0.28≦R3 / R10≦2.65. Furthermore, the following relationship is satisfied: 0.33≦R3 / R10≦2.28. The range of this relationship is advantageous for correcting chromatic aberration, and a balance of various aberrations can be achieved.

[0045] The object-side surface of sixth lens L6 includes a first object-side inflection point closest to the optical axis and a second object-side inflection point other than the first object-side inflection point, and satisfies the relational expression 0.15≦SFD1 / HFD1≦0.28, where HFD1 is the vertical distance from the first object-side inflection point to the optical axis and SFD1 is the arrow height of the first object-side inflection point. Furthermore, the relational expression 0.18≦SFD1 / HFD1≦0.25 is satisfied. The shape of the object-side surface of the sixth lens, particularly the ratio of the arrow height to the height of the first off-axis inflection point, can be reasonably controlled within the range of this relational expression, which is advantageous for correcting aberrations by the first to fifth lenses.

[0046] When the vertical distance from the second object-side inflection point to the optical axis is HFD2 and the arrow height of the second object-side inflection point is SFD2, the relationship -0.12≦SFD2 / HFD2≦0.002 is satisfied. Furthermore, the relationship -0.10≦SFD2 / HFD2≦0.002 is satisfied. The shape of the object-side surface of the sixth lens, particularly the ratio of the arrow height to the height of the second off-axis inflection point, can be reasonably controlled within the range of this relationship, which is advantageous for correcting aberrations, particularly field curvature, caused by the first to fifth lenses.

[0047] The image-side surface of the sixth lens L6 includes a first image-side inflection point closest to the optical axis, and when HFD3 is the vertical distance from the first image-side inflection point to the optical axis and SFD3 is the arrow height of the first image-side inflection point, the relationship 0.10≦SFD3 / HFD3≦0.45 is satisfied. Furthermore, the relationship 0.11≦SFD3 / HFD3≦0.38 is satisfied. Rational control of the shape of the image-side surface of the sixth lens, particularly the ratio of the arrow height to the height of the first off-axis inflection point, within the range of this relationship is advantageous for adjusting the direction of light rays after they pass through, allowing light rays with a large field of view to reach a higher position on the seventh lens, thereby increasing the angle of view.

[0048] When the focal length of the sixth lens L6 is f6 and the axial thickness of the sixth lens L6 is d11, the relationship 6.58≦f6 / d11≦11.78 is satisfied. Furthermore, the relationship 7.69≦f6 / d11≦9.85 is satisfied. By controlling the ratio of the effective focal length of the sixth lens L6 to the central thickness of the sixth lens L6 on the optical axis, the diameter-thickness ratio parameter of the sixth lens L6 can be controlled within a reasonable range, which is advantageous for lens molding for large lenses and reduces residual stress and cosmetic defects.

[0049] The first lens L1 is made of glass, and the Abbe number of the glass combined with the resin lens reduces chromatic aberration and improves the performance of the optical imaging lens.

[0050] Compared with the prior art, the imaging optical lens according to the present invention has the following characteristics: -0.25≦f12 / f34567≦0.05, 0.13≦|TEP / SAG11|*(f / R1)≦2.80, 0.15≦SZD1 / HZD1≦0.30, 0.07≦SZD2 / HZD2≦0.25, -5.00≦(f5-f6) / f≦-1.40, By configuring 1.20≦d4 / (d2+d6)≦2.00 and -1.50≦SAG51 / d8≦-0.90, the aberration of the optical system can be reduced, the imaging optical lens can have a high amount of incident light, and the object side surface of the first lens can have a reasonable curvature, which is beneficial to improving yield, controlling the focal length of the system within an appropriate range, reducing the assembly sensitivity between the sixth lens and the seventh lens, balancing the spherical aberration caused by the fifth lens and the sixth lens, and providing more diversified design for the connection structure between lenses, thereby achieving the technical effects of avoiding interference between the fourth lens and the fifth lens.

[0051] Furthermore, compared with the prior art, the present invention further satisfies the following condition: -0.25≦f12 / f34567 ≦0.05, 0.13≦|TEP / SAG11|*(f / R1)≦2.80, 0.15≦SZD1 / HZD1≦0.30, 0.07≦SZD2 / HZD2≦0.25, 0.15≦SFD1 / HFD1≦0.28, -0.12≦SFD2 / HFD2≦0.002, 0.10≦SFD3 / HFD3≦0.45. This reduces the aberration of the optical system, allows the imaging optical lens to have a high amount of incident light, and allows the object side surface of the first lens to have a reasonable curvature, which is beneficial to improving yield. It also controls the focal length of the system within an appropriate range, reduces the assembly sensitivity between the sixth lens and the seventh lens, corrects the aberration caused by the first to fifth lenses, especially the field curvature, and adjusts the direction of the light rays after passing through, allowing the light rays with a large field of view to reach a high position of the seventh lens, thereby achieving the technical effect of increasing the angle of view.

[0052] The imaging optical lens of the present invention will be described below using examples. The symbols used in each example indicate the following: focal length, axial distance, central radius of curvature, axial thickness, vertical distance or arrow height from the inflection point to the optical axis, and vertical distance or arrow height from the critical point to the optical axis are all in mm.

[0053] TTL: Total optical length (the axial distance from the object side of the first lens L1 to the image plane Si), in mm. FNO: The ratio of the effective focal length of an imaging optical lens to the entrance pupil diameter. Arrow height: Refers to the distance along the optical axis from a point on the surface to the center point of the surface on the optical axis, with positive values ​​to the right of the center point and negative values ​​to the left of the center point. Image height at 1.0x field of view: The field of view height corresponding to the effective pixels of the sensor. FOV at 1.0x field of view: The field angle corresponding to the effective pixels of the sensor. MIC field of view image height: This field of view height extends beyond 1.0 to prevent assembly variations. FOV of MIC field of view: The field angle corresponding to the image height of the MIC field of view. Maximum Optical Radius: The maximum radius that a MIC field ray reaches at the lens surface.

[0054] Next, the configuration of the present invention will be specifically described using five embodiments, but if the range of the above relational expressions is not met, the technical effects of the present invention cannot be realized.

[0055] (First embodiment) Tables 1 and 2 show design data for the imaging optical lens 10 according to the first embodiment of the present invention.

[0056] [Table 1]

[0057] However, the meaning of each symbol is as follows. S1: Aperture stop R: Radius of curvature at the center of the optical surface R1: Radius of curvature of the center of the object side of the first lens L1 R2: Radius of curvature of the center of the image side of the first lens L1 R3: Radius of curvature of the center of the object side of the second lens L2 R4: Radius of curvature of the center of the image side of the second lens L2 R5: Radius of curvature of the center of the object side of the third lens L3 R6: Radius of central curvature of the image side of the third lens L3 R7: Radius of curvature of the center of the object side of the fourth lens L4 R8: Radius of curvature of the center of the image side of the fourth lens L4 R9: Radius of curvature of the center of the object side of the fifth lens L5 R10: Radius of central curvature of the image side of the fifth lens L5 R11: Radius of curvature of the center of the object side of the sixth lens L6 R12: Radius of curvature of the center of the image side of the sixth lens element L6 R13: Radius of curvature of the center of the object side of the seventh lens L7 R14: Radius of central curvature of the image side of the seventh lens L7 R15: Radius of curvature of the center of the object side of the optical filter GF R16: Radius of curvature of the center of the image side of the optical filter GF d: Axial thickness of lens, axial distance between lenses d0: On-axis distance from aperture stop S1 to the object side of first lens L1 d1: Axial thickness of the first lens L1 d2: On-axis distance from the image side surface of the first lens L1 to the object side surface of the second lens L2 d3: Axial thickness of the second lens element L2 d4: The axial distance from the image side surface of the second lens L2 to the object side surface of the third lens L3 d5: Axial thickness of the third lens element L3 d6: On-axis distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4 d7: Axial thickness of the fourth lens element L4 d8: The axial distance from the image side surface of the fourth lens L4 to the object side surface of the fifth lens L5 d9: Axial thickness of the fifth lens element L5 d10: the axial distance from the image side surface of the fifth lens L5 to the object side surface of the sixth lens L6 d11: Axial thickness of the sixth lens element L6 d12: the axial distance from the image side surface of the sixth lens L6 to the object side surface of the seventh lens L7 d13: Axial thickness of the seventh lens element L7 d14: The axial distance from the image side surface of the seventh lens L7 to the object side surface of the optical filter GF d15: On-axis thickness of optical filter GF d16: On-axis distance from the image side of the optical filter GF to the image plane Si nd: Refractive index of the d line (d line is green light with a wavelength of 550 nm) nd1: refractive index of the first lens L1 at the d line nd2: refractive index of the d line of the second lens L2 nd3: refractive index of the d line of the third lens L3 nd4: Refractive index of the d line of the fourth lens L4 nd5: refractive index of the d line of the fifth lens L5 nd6: Refractive index of the d line of the sixth lens L6 nd7: Refractive index of the d line of the seventh lens L7 ndg: refractive index of the d line of the optical filter GF vd: Abbe number v1: Abbe number of the first lens L1 v2: Abbe number of the second lens L2 v3: Abbe number of the third lens element L3 v4: Abbe number of the fourth lens element L4 v5: Abbe number of the fifth lens element L5 v6: Abbe number of the sixth lens element L6 v7: Abbe number of the seventh lens element L7 vg: Abbe number of the optical filter GF

[0058] Table 2 shows the aspheric surface data of each lens in the imaging optical lens 10 of the first embodiment according to the present invention.

[0059] [Table 2]

[0060] For convenience, the aspherical surface of each lens surface is expressed by the following formula (27): However, the present invention is not particularly limited to the aspherical polynomial of formula (27).

[0061]

number

[0062] where k is a conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18, and A20 are aspheric coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance between a point on the aspheric curve and the optical axis, and z is the aspheric depth (the perpendicular distance between a point on the aspheric surface that is at a distance r from the optical axis and a cross section that is tangent to the vertex of the aspheric surface on the optical axis).

[0063] 2 and 3 are schematic diagrams showing the axial aberration and chromatic aberration of magnification of light with wavelengths of 655 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 435 nm after passing through the imaging optical lens 10 according to the first embodiment. Fig. 4 is a schematic diagram showing the field curvature and distortion of light with wavelength of 555 nm after passing through the imaging optical lens 10 according to the first embodiment, where the field curvature S in Fig. 4 is the field curvature in the sagittal direction and T is the field curvature in the tangential direction.

[0064] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 10 is 5.067 mm, the image height IH at a 1.0x field of view is 8.000 mm, the image height in the MIC field of view is 8.290 mm, the FOV at a 1.0x field of view is 85.00°, and the FOV in the MIC field of view is 87.4°, and the imaging optical lens 10 meets the design requirements of small aberration, a large amount of transmitted light, good processability, and low assembly sensitivity, and has excellent optical properties.

[0065] As can be understood, the image height in a 1.0x field of view refers to half the diagonal length of the sensor's effective pixel area, the image height in the MIC field of view refers to the field of view height that extends outward beyond the image height in a 1.0x field of view to prevent assembly variations, the diagonal FOV in a 1.0x field of view refers to the field angle corresponding to the sensor's effective pixel area, and the diagonal FOV in the MIC field of view refers to the field angle corresponding to the image height in the MIC field of view.

[0066] (Second embodiment) The meanings of the symbols in the second embodiment are the same as those in the first embodiment.

[0067] FIG. 5 shows an imaging optical lens 20 according to a second embodiment of the present invention.

[0068] Tables 3 and 4 show design data for the imaging optical lens 20 according to the second embodiment of the present invention.

[0069] [Table 3]

[0070] Table 4 shows the aspheric surface data of each lens in the imaging optical lens 20 of the second embodiment according to the present invention.

[0071] [Table 4]

[0072] For convenience, the aspherical surface of each lens surface is expressed by the following formula (28): However, the present invention is not particularly limited to the aspherical polynomial of formula (28).

[0073]

number

[0074] where k is a conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 are aspheric coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance between a point on the aspheric curve and the optical axis, and z is the aspheric depth (the perpendicular distance between a point on the aspheric surface that is at a distance r from the optical axis and a tangent plane that is tangent to the vertex of the aspheric surface on the optical axis).

[0075] 6 and 7 are schematic diagrams showing the axial aberration and chromatic aberration of magnification of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm, respectively, after passing through the imaging optical lens 20 according to the second embodiment. Fig. 8 is a schematic diagram showing the field curvature and distortion of light with a wavelength of 555 nm after passing through the imaging optical lens 20 according to the second embodiment. In Fig. 8, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction.

[0076] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 20 is 5.077 mm, the image height IH at a 1.0x field of view is 8.000 mm, the image height in the MIC field of view is 8.290 mm, the FOV at a 1.0x field of view is 83.00°, and the FOV in the MIC field of view is 84.97°, and the imaging optical lens 20 meets the design requirements of small aberration, a large amount of transmitted light, good processability, and low assembly sensitivity, and has excellent optical properties.

[0077] (Third embodiment) The meanings of the symbols in the third embodiment are the same as those in the first embodiment.

[0078] FIG. 9 shows an imaging optical lens 30 according to a third embodiment of the present invention.

[0079] Tables 5 and 6 show design data for the imaging optical lens 30 according to the third embodiment of the present invention.

[0080] [Table 5]

[0081] Table 6 shows the aspheric data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention, and the aspheric surface of each lens surface is expressed by the above formula (27). However, the present invention is not particularly limited to the aspheric polynomial of this formula (27).

[0082] [Table 6]

[0083] 10 and 11 are schematic diagrams showing the axial aberration and chromatic aberration of magnification of light with wavelengths of 655 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 435 nm, respectively, after passing through the imaging optical lens 30 according to the third embodiment. Fig. 12 is a schematic diagram showing the field curvature and distortion of light with a wavelength of 555 nm after passing through the imaging optical lens 30 according to the third embodiment. In Fig. 12, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction.

[0084] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 30 is 5.062 mm, the image height IH at a 1.0x field of view is 8.000 mm, the image height in the MIC field of view is 8.290 mm, the FOV at a 1.0x field of view is 85.40°, and the FOV in the MIC field of view is 87.59°, and the imaging optical lens 30 meets the design requirements of small aberration, a large amount of transmitted light, good processability, and low assembly sensitivity, and has excellent optical properties.

[0085] (Fourth embodiment) The meanings of the symbols in the fourth embodiment are the same as those in the first and second embodiments.

[0086] Tables 7 and 8 show design data for the imaging optical lens 40 according to the fourth embodiment of the present invention.

[0087] [Table 7]

[0088] Table 8 shows the aspheric data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention, and the aspheric surface of each lens surface is the aspheric surface expressed by the above formula (28). However, the present invention is not particularly limited to the aspheric polynomial of this formula (28).

[0089] [Table 8]

[0090] 14 and 15 are schematic diagrams showing the axial aberration and chromatic aberration of magnification of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm, respectively, after passing through the imaging optical lens 40 according to the fourth embodiment. Fig. 16 is a schematic diagram showing the field curvature and distortion of light with a wavelength of 555 nm after passing through the imaging optical lens 40 according to the fourth embodiment, where the field curvature S in Fig. 16 is the field curvature in the sagittal direction and T is the field curvature in the tangential direction.

[0091] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 40 is 5.136 mm, the image height IH at a 1.0x field of view is 8.000 mm, the image height in the MIC field of view is 8.250 mm, the FOV at a 1.0x field of view is 85.58°, and the FOV in the MIC field of view is 87.71°, and the imaging optical lens 40 meets the design requirements of small aberration, a large amount of transmitted light, good processability, and low assembly sensitivity, and has excellent optical properties.

[0092] (Fifth embodiment) The meanings of the symbols in the fifth embodiment are the same as those in the first embodiment.

[0093] FIG. 17 shows an imaging optical lens 50 according to a fourth embodiment of the present invention.

[0094] Tables 9 and 10 show design data for the imaging optical lens 50 according to the fifth embodiment of the present invention.

[0095] [Table 9]

[0096] Table 10 shows the aspheric data of each lens in the imaging optical lens 50 according to the fifth embodiment of the present invention, and the aspheric surface of each lens is expressed by the above formula (27). However, the present invention is not particularly limited to the aspheric polynomial of formula (27).

[0097] [Table 10]

[0098] 18 and 19 are schematic diagrams showing the axial aberration and chromatic aberration of magnification of light with wavelengths of 655 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 435 nm, respectively, after passing through the imaging optical lens 50 according to the fifth embodiment. Fig. 20 is a schematic diagram showing the field curvature and distortion of light with a wavelength of 555 nm after passing through the imaging optical lens 50 according to the fifth embodiment. In Fig. 20, the field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the tangential direction.

[0099] In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens 50 is 5.219 mm, the image height IH at a 1.0x field of view is 8.000 mm, the image height in the MIC field of view is 8.290 mm, the FOV at a 1.0x field of view is 84.95°, and the FOV in the MIC field of view is 86.97°, and the imaging optical lens 50 meets the design requirements of small aberration, a large amount of transmitted light, good processability, and low assembly sensitivity, and has excellent optical properties.

[0100] Table 11, which will be presented later, shows the values ​​corresponding to the parameters defined by the various numerical values ​​and relational expressions in each of the first, second, third, fourth and fifth embodiments.

[0101] [Table 11]

[0102] As will be understood by those skilled in the art, the above embodiments are specific embodiments for realizing the present invention, and in actual applications, various changes in form and details are possible without departing from the spirit and scope of the present invention.

Claims

1. An imaging optical lens, comprising: the imaging optical lens is composed of an aperture stop and seven lenses, the seven lenses being, in order from the object side to the image side, a first lens having positive refractive power, a second lens having negative refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power, the first lens having a convex object-side surface and a concave image-side surface, the second lens having a convex object-side surface and a concave image-side surface, the third lens having a concave image-side surface, the fourth lens having a convex object-side surface and a convex image-side surface, the fifth lens having a concave image-side surface, the sixth lens having a convex object-side surface, and the seventh lens having a concave image-side surface, a composite focal length of the first lens and the second lens is f12, a composite focal length of the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens is f34567, a distance along the optical axis from the aperture stop to the center of the object-side surface of the first lens is TEP, an arrow height at the maximum optical radius of the object-side surface of the first lens is SAG11, a focal length of the imaging optical lens is f, a central radius of curvature of the object-side surface of the first lens in the paraxial direction is R1, both the object-side surface and the image-side surface of the sixth lens include at least one critical point, a critical point on the object-side surface of the sixth lens that is closest to the optical axis is a first object-side critical point, a vertical distance from the first object-side critical point to the optical axis is HZD1, and an arrow height of the first object-side critical point is SZ an on-axis distance between the image side surface of the third lens and the object side surface of the fourth lens; an on-axis distance between the image side surface of the fifth lens and the object side surface of the fifth lens; an on-axis distance between the image side surface of the fourth lens and the object side surface of the fifth lens; an on-axis distance between the image side surface of the fourth lens and the object side surface of the fifth lens; an on-axis distance between the image side surface of the fourth lens and the object side surface of the fifth lens; an on-axis distance between the image side surface of the fourth lens and the object side surface of the fifth lens; an on-axis distance between the image side surface of the fourth lens and the object side surface of the fifth lens; an on-axis distance between the image side surface of the fourth lens and the object side surface of the fifth lens; an on-axis distance between the image side surface of the fourth lens and the object side surface of the fifth lens; an on-axis distance between the image side surface of the fourth lens and the object side surface of the fifth lens; an on-axis distance between the image side surface of the fourth lens and the object side surface of the fifth lens; an on-axis distance between the image side surface of the fourth lens and the object side surface of the fifth lens; −0.25≦f12 / f34567≦0.05 (1) 0.13≦|TEP / SAG11|*(f / R1)≦2.80 (2) 0.15≦SZD1 / HZD1≦0.30 (3) 0.07≦SZD2 / HZD2≦0.25 (4) -5.00≦(f5-f6) / f≦-1.40 (5) 1.20≦d4 / (d2+d6)≦2.00 (6) −1.50≦SAG51 / d8≦−0.90 (7)

2. 2. The imaging optical lens according to claim 1, wherein the following relational expression (8) is satisfied: −0.21≦f12 / f34567≦0.04 (8)

3. 2. The imaging optical lens according to claim 1, wherein the following relational expression (9) is satisfied: 0.15≦|TEP / SAG11|*(f / R1)≦2.50 (9)

4. 2. The imaging optical lens according to claim 1, wherein the following relational expression (10) is satisfied: 0.18≦SZD1 / HZD1≦0.25 (10)

5. 2. The imaging optical lens according to claim 1, wherein the following relational expression (11) is satisfied: 0.08≦SZD2 / HZD2≦0.22 (11)

6. 2. The imaging optical lens according to claim 1, wherein the following relational expression (12) is satisfied: -4.40≦(f5-f6) / f≦-1.70 (12)

7. 2. The imaging optical lens according to claim 1, wherein the following relational expression (13) is satisfied: 1.30≦d4 / (d2+d6)≦1.85 (13)

8. 2. The imaging optical lens according to claim 1, wherein the following relational expression (14) is satisfied: −1.25≦SAG51 / d8≦−0.95 (14)

9. 2. The imaging optical lens according to claim 1, wherein a arrow height at a maximum optical radius of an object-side surface of the sixth lens is SAG61, a arrow height at a maximum optical radius of the image-side surface of the sixth lens is SAG62, an axial thickness of the sixth lens is d11, and the following relational expression (15) is satisfied: 0.20≦(SAG61-SAG62) / d11≦0.50 (15)

10. The imaging optical lens according to claim 9, wherein the following relational expression (16) is satisfied: 0.23≦(SAG61-SAG62) / d11≦0.45 (16)

11. 2. The imaging optical lens according to claim 1, wherein a central radius of curvature of a paraxial surface of the object side of the second lens is R3, a central radius of curvature of a paraxial surface of the image side of the fifth lens is R10, and the following relational expression (17) is satisfied: 0.28≦R3 / R10≦2.65 (17)

12. 12. The imaging optical lens according to claim 11, wherein the following relational expression (18) is satisfied: 0.33≦R3 / R10≦2.28 (18)

13. The imaging optical lens according to claim 1 , wherein the first lens is made of glass.

14. An imaging optical lens, comprising: the imaging optical lens is composed of an aperture stop and seven lenses, the seven lenses being, in order from the object side to the image side, a first lens having positive refractive power, a second lens having negative refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power, the first lens having a convex object-side surface and a concave image-side surface, the second lens having a convex object-side surface and a concave image-side surface, the third lens having a concave image-side surface, the fourth lens having a convex object-side surface and a convex image-side surface, the fifth lens having a concave image-side surface, the sixth lens having a convex object-side surface, and the seventh lens having a concave image-side surface, a composite focal length of the first lens and the second lens is f12, a composite focal length of the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens is f34567, a distance along the optical axis from the aperture stop to the center of the object side surface of the first lens is TEP, a arrow height at the maximum optical radius of the object side surface of the first lens is SAG11, a focal length of the imaging optical lens is f, a central radius of curvature at the paraxial direction of the object side surface of the first lens is R1, both the object side surface and the image side surface of the sixth lens include at least one critical point, a critical point on the object side surface of the sixth lens closest to the optical axis is a first object side critical point, a vertical distance from the first object side critical point to the optical axis is HZD1, a arrow height of the first object side critical point is SZD1, a critical point on the image side surface of the sixth lens closest to the optical axis is a first image side critical point, a vertical distance from a critical point to the optical axis being HZD2, a arrow height of the first image-side critical point being SZD2, both the object-side and image-side surfaces of the sixth lens including at least one inflection point, the object-side surface of the sixth lens including a first object-side inflection point closest to the optical axis and a second object-side inflection point other than the first object-side inflection point, a vertical distance from the first object-side inflection point to the optical axis being HFD1, a arrow height of the first object-side inflection point being SFD1, an image side surface of the sixth lens includes a first image side inflection point closest to the optical axis, a vertical distance from the first image side inflection point to the optical axis is HFD3, and an arrow height of the first image side inflection point is SFD3; and the imaging optical lens satisfies the following relational expressions (1) to (4) and (19) to (21): −0.25≦f12 / f34567≦0.05 (1) 0.13≦|TEP / SAG11|*(f / R1)≦2.80 (2) 0.15≦SZD1 / HZD1≦0.30 (3) 0.07≦SZD2 / HZD2≦0.25 (4) 0.15≦SFD1 / HFD1≦0.28 (19) −0.12≦SFD2 / HFD2≦0.002 (20) 0.10≦SFD3 / HFD3≦0.45 (21)

15. 15. The imaging optical lens according to claim 14, wherein the following relational expression (8) is satisfied: −0.21≦f12 / f34567≦0.04 (8)

16. 15. The imaging optical lens according to claim 14, wherein the following relational expression (9) is satisfied: 0.15≦|TEP / SAG11|*(f / R1)≦2.50 (9)

17. 15. The imaging optical lens according to claim 14, wherein the following relational expression (10) is satisfied: 0.18≦SZD1 / HZD1≦0.25 (10)

18. 15. The imaging optical lens according to claim 14, wherein the following relational expression (11) is satisfied: 0.08≦SZD2 / HZD2≦0.22 (11)

19. 15. The imaging optical lens according to claim 14, wherein the following relational expression (22) is satisfied: 0.18≦SFD1 / HFD1≦0.25 (22)

20. 15. The imaging optical lens according to claim 14, wherein the following relational expression (23) is satisfied: −0.10≦SFD2 / HFD2≦0.002 (23)

21. 15. The imaging optical lens according to claim 14, wherein the following relational expression (24) is satisfied: 0.11≦SFD3 / HFD3≦0.38 (24)

22. The imaging optical lens according to claim 14, wherein the focal length of the sixth lens is f6, the on-axis thickness of the sixth lens is d11, and the following relational expression (25) is satisfied: 6.58≦f6 / d11≦11.78 (25)

23. 23. The imaging optical lens according to claim 22, wherein the following relational expression (26) is satisfied: 7.69≦f6 / d11≦9.85 (26)

24. The imaging optical lens according to claim 14, wherein the first lens is made of glass.

Images