US20190377160A1 - Imaging lens - Google Patents

Imaging lens Download PDF

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Publication number
US20190377160A1
US20190377160A1 US16/232,655 US201816232655A US2019377160A1 US 20190377160 A1 US20190377160 A1 US 20190377160A1 US 201816232655 A US201816232655 A US 201816232655A US 2019377160 A1 US2019377160 A1 US 2019377160A1
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Prior art keywords
lens
optical axis
image
imaging lens
focal length
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US16/232,655
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Inventor
Yukio Sekine
Masaya Hashimoto
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Kantatsu Co Ltd
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Kantatsu Co Ltd
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Publication of US20190377160A1 publication Critical patent/US20190377160A1/en
Assigned to KANTATSU CO., LTD. reassignment KANTATSU CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HASHIMOTO, MASAYA, SEKINE, YUKIO
Priority to US17/364,263 priority Critical patent/US11754813B2/en
Priority to US17/391,788 priority patent/US11754814B2/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/60—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having five components only
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles

Definitions

  • the present invention relates to an imaging lens which forms an image of an object on a solid-state image sensor such as a CCD sensor or a C-MOS sensor used in an imaging device, and more particularly relates to an imaging lens which is built in an increasingly compact and high-performance smartphone and mobile phone, an information terminal such as a PDA (Personal Digital Assistant), a game console, PC and a robot, and moreover, a home appliance with camera function, a monitoring camera and an automobile.
  • a PDA Personal Digital Assistant
  • the imaging lens mounted in such equipment is required to be compact and have high-resolution performance.
  • Patent Document 1 JP2015-225246A
  • Patent Document 1 discloses an imaging lens comprising, in order from an object side, a first lens having positive refractive power, a second lens, a third lens, a fourth lens having the positive refractive power, and a fifth lens having negative refractive power and a concave surface facing an image side near the optical axis.
  • the present invention has been made in view of the above-described problems, and an object of the present invention is to provide an imaging lens with high resolution which satisfies demand of the wide field of view, the low-profileness and the low F-number in well balance and excellently corrects aberrations.
  • a convex surface implies that a shape of the lens surface near an optical axis (paraxial portion).
  • Refractive power implies the refractive power near the optical axis.
  • a pole point implies an off-axial point on an aspheric surface at which a tangential plane intersects the optical axis perpendicularly.
  • Total track length is defined as a distance along the optical axis from an object-side surface of an optical element located closest to the object to an image plane. “The total track length” and a back focus is a distance obtained when thickness of an IR cut filter or a cover glass which may be arranged between the imaging lens and the image plane is converted into an air-converted distance.
  • An imaging lens comprises, in order from an object side to an image side, a first lens having positive refractive power and a convex surface facing the object side near the optical axis, a second lens having negative refractive power near the optical axis, a third lens having the positive refractive power near the optical axis, a fourth lens, and a fifth lens having the negative refractive power and a concave surface facing the image side near the optical axis, wherein the image-side surface of the fifth lens is formed as an aspheric surface having at least one off-axial pole point.
  • the first lens achieves wide field of view and low-profileness by strengthening the refractive power.
  • the second lens properly corrects spherical aberration and chromatic aberration.
  • the third lens properly corrects astigmatism, coma aberration and distortion.
  • the fourth lens properly corrects the astigmatism, field curvature, the distortion and the chromatic aberration.
  • the fifth lens secures a back focus while maintaining the low-profileness.
  • the image-side surface of the fifth lens has the concave surface facing the image side near the optical axis, and the field curvature and the distortion can be properly corrected and the light ray incident angle to an image sensor can be properly controlled, when the image-side surface of the fifth lens is formed as the aspheric surface having at least one off-axial pole point.
  • the object-side surface of the third lens has the concave surface facing the object side near the optical axis.
  • the object-side surface of the third lens has the concave surface facing the object side near the optical axis, the light ray incident angle to the object-side surface of the third lens can be appropriately controlled, and the astigmatism and the distortion can be properly corrected.
  • the image-side surface of the third lens has the convex surface facing the image side near the optical axis.
  • the image-side surface of the third lens has the convex surface facing the image side near the optical axis
  • the light ray incident angle to the image-side surface of the third lens can be appropriately controlled, and the coma aberration and the spherical aberration can be properly corrected.
  • the object-side surface of the fifth lens has the convex surface facing the object side near the optical axis.
  • the astigmatism, the field curvature and the distortion can be properly corrected.
  • the object-side surface of the fifth lens is formed as the aspheric surface having at least one off-axial pole point.
  • the object-side surface of the fifth lens is formed as the aspheric surface having at least one off-axial pole point, the field curvature and the distortion can be properly corrected and the light ray incident angle to an image sensor can be properly controlled,
  • vd4 abbe number at d-ray of the fourth lens
  • vd5 abbe number at d-ray of the fifth lens
  • conditional expression (1) defines an appropriate range the respective abbe numbers at d-ray of the fourth lens and the fifth lens. By satisfying the conditional expression (1), the chromatic aberration can be properly corrected.
  • T1 distance along the optical axis from the image-side surface of the first lens to the object-side surface of the second lens
  • T2 distance along the optical axis from the image-side surface of the second lens to the object-side surface of the third lens.
  • the conditional expression (2) defines an appropriate range of an interval along the optical axis between the first lens and the second lens, and the interval along the optical axis between the second lens and the third lens.
  • r7 paraxial curvature radius of the object-side surface of the fourth lens
  • r8 paraxial curvature radius of the image-side surface of the fourth lens
  • the conditional expression (3) defines shapes of the object-side surface and the image-side surface of the fourth lens by a ratio of paraxial curvature radii. When a value is above the lower limit of the conditional expression (3), the spherical aberration and the distortion can be properly corrected.
  • T1 distance along the optical axis from the image-side surface of the first lens to the object-side surface of the second lens
  • f focal length of the overall optical system of the imaging lens
  • conditional expression (4) defines an appropriate range of the distance along the optical axis from the image-side surface of the first lens to the object-side surface of the second lens.
  • r7 paraxial curvature radius of the object-side surface of the fourth lens
  • f focal length of the overall optical system of the imaging lens
  • conditional expression (5) defines an appropriate range of the paraxial curvature radius of the object-side surface of the fourth lens. When the value is above the lower limit of the conditional expression (5), the spherical aberration and the distortion are properly corrected.
  • T3 distance along the optical axis from the image-side surface of the third lens to the object-side surface of the fourth lens
  • f focal length of the overall optical system of the imaging lens
  • conditional expression (6) defines an appropriate range of the distance along the optical axis from the image-side surface of the third lens to the object-side surface of the fourth lens.
  • T2 distance along the optical axis from the image-side surface of the second lens to the object-side surface of the third lens
  • T3 distance along the optical axis from the image-side surface of the third lens to the object-side surface of the fourth lens.
  • the conditional expression (7) defines an appropriate range of an interval along the optical axis between the second lens and the third lens and an interval along the optical axis between the third lens and the fourth lens.
  • D4 thickness along the optical axis of the fourth lens
  • D5 thickness along the optical axis of the fifth lens
  • conditional expression (8) defines an appropriate range of the thickness along the optical axis of the fourth lens and the thickness along the optical axis of the fifth lens.
  • r6 paraxial curvature radius of the image-side surface of the third lens
  • f focal length of the overall optical system of the imaging lens
  • the conditional expression (9) defines an appropriate range of the paraxial curvature radius of the image-side surface of the third lens.
  • a value is below the upper limit of the conditional expression (9) it becomes facilitated to suppress the spherical aberration and the distortion occurred at this surface and to reduce sensitivity to manufacturing error, while maintaining the refractive power of the image-side surface of the third lens.
  • a value is above the lower limit of the conditional expression (9) it becomes possible to properly correct the astigmatism and the field curvature.
  • D3 thickness along the optical axis of the third lens
  • f3 focal length of the third lens
  • the conditional expression (10) defines an appropriate range of the thickness along the optical axis of the third lens.
  • a value is below the upper limit of the conditional expression (10)
  • the thickness along the optical axis of the third lens is suppressed from being too large, and an air gap of the object side and the image side of the third lens can be easily secured. As a result, the low-profileness can be maintained.
  • the value is above the lower limit of the conditional expression (10)
  • the thickness along the optical axis of the third lens is suppressed from being too small, and the formability of the lens becomes excellent.
  • f3 focal length of the third lens
  • f focal length of the overall optical system of the imaging lens
  • the conditional expression (11) defines an appropriate range of the refractive power of the third lens.
  • a value is below the upper limit of the conditional expression (11)
  • the positive refractive power of the third lens becomes appropriate and the low-profileness can be realized.
  • the value is above the lower limit of the conditional expression (11)
  • the spherical aberration, the coma aberration and the distortion can be properly corrected.
  • f2 focal length of the second lens
  • f3 focal length of the third lens
  • the conditional expression (12) defines an appropriate range of the refractive power of the second lens and the third lens.
  • a value is below the upper limit of the conditional expression (12)
  • the coma aberration and the astigmatism can be properly corrected.
  • the value is above the lower limit of the conditional expression (12)
  • the field curvature can be properly corrected.
  • f3 focal length of the third lens
  • f5 focal length of the fifth lens
  • the conditional expression (13) defines an appropriate range of the refractive power of the third lens and the fifth lens.
  • a value is below the upper limit of the conditional expression (13)
  • the astigmatism can be properly corrected.
  • the value is above the lower limit of the conditional expression (13)
  • the refractive power of the third lens becomes appropriate and the low-profileness can be realized. Furthermore, the chromatic aberration can be properly corrected.
  • r8 paraxial curvature radius of the image-side surface of the fourth lens
  • f focal length of the overall optical system of the imaging lens
  • the conditional expression (14) defines an appropriate range of the paraxial curvature radius of the image-side surface of the fourth lens.
  • a value is below the upper limit of the conditional expression (14)
  • the astigmatism and the coma aberration can be properly corrected.
  • the value is above the lower limit of the conditional expression (14)
  • f4 focal length of the fourth lens
  • f focal length of the overall optical system of the imaging lens
  • the conditional expression (15) defines an appropriate range of the refractive power of the fourth lens.
  • the negative refractive power of the fourth lens becomes appropriate, and the low-profileness can be achieved.
  • the value is above the lower limit of the conditional expression (15)
  • the chromatic aberration and the spherical aberration can be properly corrected.
  • composite refractive power of the second lens and the third lens is positive, and more preferable that a below conditional expression (16) is satisfied:
  • f23 composite focal length of the second lens and the third lens
  • f focal length of the overall optical system of the imaging lens
  • the conditional expression (16) defines an appropriate range of the composite refractive power of the second lens and the third lens.
  • a value is below the upper limit of the conditional expression (16)
  • the positive composite refractive power of the second lens and the third lens become appropriate, and the low-profileness can be achieved.
  • the value is above the lower limit of the conditional expression (16)
  • the spherical aberration and the coma aberration can be properly corrected.
  • f1 focal length of the first lens
  • f3 focal length of the third lens
  • the conditional expression (17) defines an appropriate range of the refractive power of the first lens and the third lens.
  • the positive refractive power is balanced to the first lens and the third lens, and the astigmatism and the distortion can be properly corrected while realizing the low-profileness and the wide field of view.
  • an imaging lens with high resolution which satisfies demand of the wide field of view, the low-profileness and the low F-number in well balance, and properly corrects aberrations.
  • FIG. 1 is a schematic view showing a general configuration of an imaging lens in Example 1 according to the present invention
  • FIG. 2 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 1 according to the present invention
  • FIG. 3 is a schematic view showing the general configuration of an imaging lens in Example 2 according to the present invention.
  • FIG. 4 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 2 according to the present invention
  • FIG. 5 is a schematic view showing the general configuration of an imaging lens in Example 3 according to the present invention.
  • FIG. 6 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 3 according to the present invention
  • FIG. 7 is a schematic view showing the general configuration of an imaging lens in Example 4 according to the present invention.
  • FIG. 8 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 4 according to the present invention.
  • FIG. 9 is a schematic view showing a general configuration of an imaging lens in Example 5 according to the present invention.
  • FIG. 10 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 5 according to the present invention
  • FIG. 11 is a schematic view showing the general configuration of an imaging lens in Example 6 according to the present invention.
  • FIG. 12 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 6 according to the present invention
  • FIG. 13 is a schematic view showing the general configuration of an imaging lens in Example 7 according to the present invention.
  • FIG. 14 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 7 according to the present invention
  • FIG. 15 is a schematic view showing a general configuration of an imaging lens in Example 8 according to the present invention.
  • FIG. 16 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 8 according to the present invention
  • FIG. 17 is a schematic view showing the general configuration of an imaging lens in Example 9 according to the present invention.
  • FIG. 18 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 9 according to the present invention
  • FIG. 19 is a schematic view showing the general configuration of an imaging lens in Example 10 according to the present invention.
  • FIG. 20 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 10 according to the present invention.
  • FIG. 21 is a schematic view showing the general configuration of an imaging lens in Example 11 according to the present invention.
  • FIG. 22 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 11 according to the present invention
  • FIG. 23 is a schematic view showing the general configuration of an imaging lens in Example 12 according to the present invention.
  • FIG. 24 shows spherical aberration, astigmatism, and distortion of the imaging lens in Example 12 according to the present invention.
  • FIGS. 1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21 and 23 are schematic views of the imaging lenses in Examples 1 to 12 according to the embodiments of the present invention, respectively.
  • the imaging lens comprises in order from an object side to an image side, a first lens L 1 having positive refractive power and a convex surface facing the object side near an optical axis X, a second lens L 2 having the negative refractive power near the optical axis X, a third lens L 3 having the positive refractive power near the optical axis X, a fourth lens L 4 , and a fifth lens L 5 having negative refractive power and a concave surface facing an image side near the optical axis X.
  • the image-side surface of the fifth lens L 5 is formed as an aspheric surface having at least one off-axial pole point.
  • a filter IR such as an IR cut filter and a cover glass are arranged between the fifth lens L 5 and an image plane IMG (namely, the image plane of an image sensor).
  • the filter IR is omissible.
  • the first lens L 1 has the positive refractive power, and the wide field of view and the low-profileness are achieved by strengthening the refractive power.
  • the shape of the first lens L 1 is bi-convex shape having the convex surfaces facing the object side and the image side near the optical axis X, and the positive refractive power on the both sides is favorable for the low-profileness.
  • the shape of the first lens L 1 may be a meniscus shape having the convex surface facing the object side and the concave surface facing the image side near the optical axis X as in the Examples 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 and 12 shown in FIGS. 3, 5, 7, 9, 11, 13, 15, 17, 19, 21 and 23 . In this case, the spherical aberration, the astigmatism and the distortion are properly corrected.
  • the second lens L 2 has the negative refractive power, and the spherical aberration and the chromatic aberration are properly corrected.
  • the shape of the second lens L 2 is the meniscus shape having the concave surface facing the object side and the convex surface facing the image side near the optical axis X, therefore the light ray incident angle to the second lens L 2 is appropriately suppressed, and the coma aberration, the astigmatism and the distortion are properly corrected.
  • the shape of the second lens L 2 may be a bi-concave shape having the concave surfaces facing the object side and the image side near the optical axis X as in the Examples 4, 5, 6, 7, 9, 10, 11 and 12 shown in FIGS. 7, 9, 11, 13, 17, 19, 21 and 23 .
  • the shape may be the meniscus shape having the convex surface facing the object side and the concave surface facing the image side near the optical axis X. In this case, the astigmatism, the field curvature and the distortion are properly corrected.
  • the third lens L 3 has the positive refractive power, and the astigmatism, the coma aberration and the distortion are properly corrected.
  • the shape of the third lens L 3 is the meniscus shape having the concave surface facing the object side and the convex surface facing the image side near the optical axis X, therefore the light ray incident angle to the third lens L 3 is appropriately suppressed, and the spherical aberration, the astigmatism, the coma aberration and the distortion are properly corrected.
  • the fourth lens L 4 has the negative refractive power, and the astigmatism, the field curvature, the distortion and the chromatic aberration are properly corrected.
  • the shape of the fourth lens L 4 is the bi-concave shape having the concave surfaces facing the object side and the image side near the optical axis X, and the negative refractive power on the both sides is favorable for the correction of the chromatic aberration.
  • the shape of the fourth lens L 4 may be the meniscus shape having the convex surface facing the object side and the concave surface facing the image side near the optical axis X as in the Examples 3, 4, 5, 6, 7, 10 and 11 shown in FIGS. 5, 7, 9, 11, 13, 19 and 21 . In this case, the astigmatism and the distortion are properly corrected.
  • the fifth lens L 5 has the negative refractive power, and secures a back focus while maintaining the low-profileness.
  • the shape of the fifth lens L 5 is the meniscus shape having the convex surface facing the object side and the concave surface facing the image side near the optical axis X, and the astigmatism, the field curvature and the distortion are properly corrected.
  • the object-side surface and the image-side surface of the fifth lens L 5 are formed as the aspheric surfaces having at least one off-axial pole point, therefore the field curvature and the distortion are properly corrected and the light ray incident angle to an image sensor is properly controlled.
  • all lenses of the first lens L 1 to the fifth lens L 5 are preferably single lenses. Configuration with only the single lenses can frequently use the aspheric surfaces.
  • all lens-surfaces are formed as the appropriate aspherical surfaces, and proper aberration correction is made. In comparison with the case in which a cemented lens is used, workload is reduced, and manufacturing in low cost becomes possible.
  • the imaging lens according to the present embodiments makes manufacturing facilitated by using plastic material for all of the lenses, and mass production in a low cost can be realized.
  • the material applied to the lens is not limited to the plastic material. By using glass material, further high performance may be aimed. It is preferable that all of lens-surfaces are formed as aspheric surfaces, however, spherical surfaces easy to be manufactured may be adopted in accordance with required performance.
  • the imaging lens according to the present embodiments shows preferable effect by satisfying the below conditional expressions (1) to (17).
  • vd4 abbe number at d-ray of the fourth lens L 4
  • vd5 abbe number at d-ray of the fifth lens L 5
  • D3 thickness along the optical axis X of the third lens L 3
  • D4 thickness along the optical axis X of the fourth lens L 4
  • D5 thickness along the optical axis X of the fifth lens L 5
  • T1 distance along the optical axis X from the image-side surface of the first lens L 1 to the object-side surface of the second lens L 2
  • T2 distance along the optical axis X from the image-side surface of the second lens L 2 to the object-side surface of the third lens L 3
  • T3 distance along the optical axis X from the image-side surface of the third lens L 3 to the object-side surface of the fourth lens L 4
  • f focal length of the overall optical system of the imaging lens
  • f1 focal length of the first lens L 1
  • f2 focal length of the second
  • the imaging lens according to the present embodiments shows further preferable effect by satisfying the below conditional expressions (1a) to (17a).
  • the aspheric shapes of the surfaces of the aspheric lens are expressed by Equation 1, where Z denotes an axis in the optical axis direction, H denotes a height perpendicular to the optical axis, R denotes a paraxial curvature radius, k denotes a conic constant, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 denote aspheric surface coefficients.
  • f denotes the focal length of the overall optical system of the imaging lens
  • Fno denotes a F-number
  • ⁇ denotes a half field of view
  • ih denotes a maximum image height
  • TTL denotes total track length.
  • i denotes surface number counted from the object side
  • r denotes a curvature radius
  • d denotes the distance of lenses along the optical axis (surface distance)
  • Nd denotes a refractive index at d-ray (reference wavelength)
  • vd denotes an abbe number at d-ray.
  • an asterisk (*) is added after surface number i.
  • the basic lens data is shown below in Table 1.
  • Example 13 The imaging lens in Example 1 satisfies conditional expressions (1) to (17) as shown in Table 13.
  • FIG. 2 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 1.
  • the spherical aberration diagram shows the amount of aberration at wavelengths of F-ray (486 nm), d-ray (588 nm), and C-ray (656 nm).
  • the astigmatism diagram shows the amount of aberration at d-ray on a sagittal image surface S (solid line) and on tangential image surface T (broken line), respectively (same as FIGS. 4, 6, 8, 10, 12, 14, 16, 18, 20, 22 and 24 ). As shown in FIG. 2 , each aberration is corrected excellently.
  • the basic lens data is shown below in Table 2.
  • Example 2 The imaging lens in Example 2 satisfies conditional expressions (1) to (17) as shown in Table 13.
  • FIG. 4 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 2. As shown in FIG. 4 , each aberration is corrected excellently.
  • Example 3 The imaging lens in Example 3 satisfies conditional expressions (1) to (17) as shown in Table 13.
  • FIG. 6 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 3. As shown in FIG. 6 , each aberration is corrected excellently.
  • the basic lens data is shown below in Table 4.
  • Example 4 The imaging lens in Example 4 satisfies conditional expressions (1) to (17) as shown in Table 13.
  • FIG. 8 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 4. As shown in FIG. 8 , each aberration is corrected excellently.
  • the basic lens data is shown below in Table 5.
  • Example 5 The imaging lens in Example 5 satisfies conditional expressions (1) to (17) as shown in Table 13.
  • FIG. 10 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 5. As shown in FIG. 10 , each aberration is corrected excellently.
  • the basic lens data is shown below in Table 6.
  • Example 6 The imaging lens in Example 6 satisfies conditional expressions (1) to (17) as shown in Table 13.
  • FIG. 12 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 6. As shown in FIG. 12 , each aberration is corrected excellently.
  • Example 7 The imaging lens in Example 7 satisfies conditional expressions (1) to (17) as shown in Table 13.
  • FIG. 14 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 7. As shown in FIG. 14 , each aberration is corrected excellently.
  • Example 8 The imaging lens in Example 8 satisfies conditional expressions (1) to (17) as shown in Table 13.
  • FIG. 16 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 8. As shown in FIG. 16 , each aberration is corrected excellently.
  • the basic lens data is shown below in Table 9.
  • Example 9 The imaging lens in Example 9 satisfies conditional expressions (1) to (17) as shown in Table 13.
  • FIG. 18 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 9. As shown in FIG. 18 , each aberration is corrected excellently.
  • the basic lens data is shown below in Table 10.
  • Example 10 The imaging lens in Example 10 satisfies conditional expressions (1) to (17) as shown in Table 13.
  • FIG. 20 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 10. As shown in FIG. 20 , each aberration is corrected excellently.
  • the basic lens data is shown below in Table 11.
  • Example 11 The imaging lens in Example 11 satisfies conditional expressions (1) to (17) as shown in Table 13.
  • FIG. 22 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 11. As shown in FIG. 22 , each aberration is corrected excellently.
  • the basic lens data is shown below in Table 12.
  • Example 12 The imaging lens in Example 12 satisfies conditional expressions (1) to (17) as shown in Table 13.
  • FIG. 24 shows spherical aberration (mm), astigmatism (mm), and distortion (%) of the imaging lens in Example 12. As shown in FIG. 24 , each aberration is corrected excellently.
  • Example 1 Example 2
  • Example 3 Example 4
  • Example 5 Example 6 (1) vd4/vd5 0.36 0.35 0.35 0.35 0.35 0.35 (2) T1/T2 2.37 1.25 1.30 1.79 1.52 2.00 (3)
  • the imaging lens according to the present invention is adopted to a product with the camera function, there is realized contribution to the wide field of view, the low-profileness and the low F-number of the camera and also high performance thereof.

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US11754813B2 (en) 2023-09-12
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US20210364759A1 (en) 2021-11-25
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US11754814B2 (en) 2023-09-12
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