Imaging optical system lens, image capturing device and electronic device

Abstract

An imaging optical system lens, an image capturing device and an electronic device are disclosed. The imaging optical system lens includes six lenses. The six lenses are sequentially arranged from an object side to an image side of an optical path as a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens. Each lens has an object side surface facing the object side and an image side surface facing the image side. The first lens has negative refractive power. The object side surface of the first lens is concave near an optical axis. The image side surface of the first lens is convex near the optical axis. The second lens has positive refractive power. The object side surface of the second lens is convex near the optical axis. The image side surface of the second lens is concave near the optical axis. The fifth lens has positive refractive power. When certain conditions are met, the spherical aberration of the central field of view can be reduced.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to an imaging optical system lens and an image capturing device, and particularly to a miniaturized imaging optical system lens and an image capturing device applied to an electronic device. BACKGROUND

[0002] With the advancement of semiconductor manufacturing technology, the performance of electronic photosensitive elements is improved, and the pixel size can be smaller. Therefore, optical lenses with high imaging quality are indispensable. With the rapid development of technology, electronic devices equipped with optical lenses are more widely used, and the requirements for optical lenses are more diverse. Since the optical lenses of the past are not easy to balance the demands of imaging quality, sensitivity, aperture size, volume, or viewing angle, the present disclosure provides an optical lens to meet the needs. SUMMARY

[0003] The imaging optical system lens, image capturing device, and electronic device provided by the present disclosure help to increase the viewing angle and the image size, and reduce the spherical aberration of the central field of view by configuring the first lens with negative refractive power and matching the ratio of the sixth lens to the overall focal length of the imaging optical system lens.

[0004] According to the present disclosure, an imaging optical system lens is provided, which includes six lenses. The six lenses are sequentially arranged from an object side to an image side of an optical path as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Each lens has an object side surface facing the object side and an image side surface facing the image side. The total number of lenses in the imaging optical system lens is six. The first lens has negative refractive power, the object side surface of the first lens is concave near the optical axis, and the image side surface of the first lens is convex near the optical axis. The second lens has positive refractive power, the object side surface of the second lens is convex near the optical axis, and the image side surface of the second lens is concave near the optical axis. The third lens has positive refractive power. The fifth lens has positive refractive power. The thickness of the third lens on the optical axis is CT3, the thickness of the fourth lens on the optical axis is CT4, the thickness of the fifth lens on the optical axis is CT5, the focal length of the imaging optical system lens is f, the focal length of the fourth lens is f4, the focal length of the sixth lens is f6, the Abbe number of the second lens is V2, and the Abbe number of the fourth lens is V4. The following conditions are met: 5.30 < (CT3 + CT5) / CT4 < 15.0; -2.10 < f / f4 < 1.00; -0.35 < f / f6 < 0.90; and 12 < (V2 + V4) / 2 < 24.

[0005] According to the present disclosure, an image capturing device is provided, which includes the imaging optical system lens as described in the preceding paragraph and an electronic photosensitive element, wherein the electronic photosensitive element is disposed on the imaging surface of the imaging optical system lens.

[0006] An electronic device is also provided according to the present disclosure, comprising the image capturing device of the previous paragraph.

[0007] An imaging optical system lens according to the present disclosure includes six lenses in order from an object side to an image side of an optical path as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Each lens has an object side surface facing the object side and an image side surface facing the image side. The total number of lenses in the imaging optical system lens is six. The first lens has negative refractive power, the first lens object side surface is concave near an optical axis, and the first lens image side surface is convex near the optical axis. The second lens image side surface is concave near the optical axis. The third lens has positive refractive power. The fifth lens has positive refractive power. The sixth lens image side surface is concave near the optical axis. At least one surface of at least one of the six lenses includes at least one inflection point. A radius of curvature of the second lens image side surface is R4, a radius of curvature of the sixth lens image side surface is R12, a focal length of the imaging optical system lens is f, a focal length of the sixth lens is f6, a separation distance on the optical axis between the third lens and the fourth lens is T34, a separation distance on the optical axis between the fourth lens and the fifth lens is T45, and a separation distance on the optical axis between the fifth lens and the sixth lens is T56, which satisfy the following conditions: 1.60 < (R4+R12) / (R4-R12) < 3.30; 4.22 < f / (T34+T45+T56) < 15.0; and -0.63 < f / f6 < 1.20.

[0008] An imaging optical system lens according to the present disclosure includes six lenses in order from an object side to an image side of an optical path as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Each lens has an object side surface facing the object side and an image side surface facing the image side. The total number of lenses in the imaging optical system lens is six. The first lens has negative refractive power, the first lens object side surface is concave near an optical axis, and the first lens image side surface is convex near the optical axis. The third lens has positive refractive power. The fifth lens has positive refractive power. The sixth lens image side surface is concave near the optical axis. At least one surface of at least one of the six lenses includes at least one inflection point. A radius of curvature of the second lens image side surface is R4, a radius of curvature of the fifth lens image side surface is R10, a radius of curvature of the sixth lens image side surface is R12, a focal length of the imaging optical system lens is f, a focal length of the fourth lens is f4, and a focal length of the sixth lens is f6, which satisfy the following conditions: (R4+R12) / (R4-R12) < 2.32; -0.65 < f / f4 < 0.80; -0.37 < f / f6 < 1.00; and -4.00 < R10 / R12 < -1.55.

[0009] An imaging optical system lens assembly is provided according to the present disclosure. The imaging optical system lens assembly includes six lenses. The six lenses are sequentially arranged from an object side to an image side along an optical path as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Each lens has an object side surface facing the object side and an image side surface facing the image side. The total number of lenses in the imaging optical system lens assembly is six. The first lens has negative refractive power. The third lens has positive refractive power. The fifth lens has positive refractive power. At least one surface of at least one of the six lenses includes at least one inflection point. The imaging optical system lens assembly further includes a stop. A distance between the stop and an image plane on an optical axis is SL. A focal length of the imaging optical system lens assembly is f. A focal length of the sixth lens is f6. A combined focal length of the second lens and the third lens is f23. A distance between the first lens and the second lens on the optical axis is T12. A distance between the second lens and the third lens on the optical axis is T23. A distance between the third lens and the fourth lens on the optical axis is T34. A distance between the fourth lens and the fifth lens on the optical axis is T45. A distance between the fifth lens and the sixth lens on the optical axis is T56. A thickness of the third lens on the optical axis is CT3. A thickness of the fourth lens on the optical axis is CT4. A thickness of the fifth lens on the optical axis is CT5. The following conditions are satisfied: 4.50 < (CT3 + CT5) / CT4 < 8.00; 1.95 < f / (T12 + T23) < 16.0; 3.70 < f / (T34 + T45 + T56) < 14.5; -0.10 < f / f23 < 0.92; -0.25 < f / f6 < 0.55; and 2.00 < SL / f < 2.90.

[0010] When (CT3 + CT5) / CT4 satisfies the above condition, the ratio of the sum of the thicknesses of the third lens and the fifth lens to the thickness of the fourth lens can be adjusted to help maintain the thickness ratio of the third lens to the fifth lens, thereby reducing manufacturing difficulty.

[0011] When f / f4 satisfies the above condition, the refractive power of the fourth lens can be adjusted to help balance the refractive powers of the third lens to the fifth lens, thereby achieving better light collection.

[0012] When f / f6 satisfies the above condition, the refractive power of the sixth lens can be adjusted to help reduce the spherical aberration of the central field of view.

[0013] When (R4 + R12) / (R4 - R12) satisfies the above condition, the curvature radii of the image side surfaces of the second lens and the sixth lens can be adjusted to help balance the light collection quality between the second lens and the sixth lens, thereby reducing the spherical aberration of the central and adjacent fields of view.

[0014] When f / (T34+T45+T56) satisfies the above condition, the ratio of the focal length and the total sum of all lens spacings between the third lens and the sixth lens can be adjusted to balance between the total length of the imaging optical system lens group and the assembly error.

[0015] When R10 / R12 satisfies the above condition, the ratio of the radius of curvature of the image side surface of the fifth lens and the radius of curvature of the image side surface of the sixth lens can be adjusted to help maintain the light collecting ability of the fifth lens and the sixth lens and reduce the back focal length.

[0016] When f / (T12+T23) satisfies the above condition, the ratio of the total sum of lens spacings of the first lens to the third lens and the focal length can be adjusted to help maintain the distance between the first lens to the third lens and balance the volume of the imaging optical system lens group.

[0017] When f / f23 satisfies the above condition, the total refractive power of the second lens and the third lens can be adjusted to balance the refractive power of the first lens and help improve the view angle.

[0018] When SL / f satisfies the above condition, the distance between the aperture and the imaging surface can be adjusted to help balance between the imaging size and the length of the lens group behind the aperture. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A schematic diagram of an image capturing device according to a first embodiment of the present disclosure is shown;

[0020] Figure 2 The ball aberration, the astigmatism and the distortion curves of the first embodiment are shown in sequence from left to right;

[0021] Figure 3 A schematic diagram of an image capturing device according to a second embodiment of the present disclosure is shown;

[0022] Figure 4 The ball aberration, the astigmatism and the distortion curves of the second embodiment are shown in sequence from left to right;

[0023] Figure 5 A schematic diagram of an image capturing device according to a third embodiment of the present disclosure is shown;

[0024] Figure 6 The ball aberration, the astigmatism and the distortion curves of the third embodiment are shown in sequence from left to right;

[0025] Figure 7 A schematic diagram of an image capturing device according to a fourth embodiment of the present disclosure is shown;

[0026] Figure 8 The ball aberration, the astigmatism and the distortion curves of the fourth embodiment are shown in sequence from left to right;

[0027] Figure 9 FIG. 6 shows a schematic diagram of an image capturing device according to an embodiment of the present disclosure;

[0028] Figure 10 From left to right in sequence are the spherical aberration, the astigmatism and the distortion curves of the fifth embodiment;

[0029] Figure 11 FIG. 7 shows a schematic diagram of an image capturing device according to an embodiment of the present disclosure;

[0030] Figure 12 From left to right in sequence are the spherical aberration, the astigmatism and the distortion curves of the sixth embodiment;

[0031] Figure 13 FIG. 8 shows a schematic diagram of an image capturing device according to an embodiment of the present disclosure;

[0032] Figure 14 From left to right in sequence are the spherical aberration, the astigmatism and the distortion curves of the seventh embodiment;

[0033] Figure 15 FIG. 9 shows a schematic diagram of an image capturing device according to an embodiment of the present disclosure;

[0034] Figure 16 From left to right in sequence are the spherical aberration, the astigmatism and the distortion curves of the eighth embodiment;

[0035] Figure 17 FIG. 10 shows a schematic diagram of an image capturing device according to an embodiment of the present disclosure;

[0036] Figure 18 From left to right in sequence are the spherical aberration, the astigmatism and the distortion curves of the ninth embodiment;

[0037] Figure 19 FIG. 11 shows a schematic diagram of an image capturing device according to an embodiment of the present disclosure;

[0038] Figure 20 From left to right in sequence are the spherical aberration, the astigmatism and the distortion curves of the tenth embodiment;

[0039] Figure 21 FIG. 12 shows a schematic diagram of an image capturing device according to an embodiment of the present disclosure;

[0040] Figure 22 From left to right in sequence are the spherical aberration, the astigmatism and the distortion curves of the eleventh embodiment;

[0041] Figure 23 FIG. 13 shows a schematic diagram of some parameters, the inflection points of the lenses and the critical point of the fifth lens according to the first embodiment;

[0042] Figure 24FIG. 1 shows a perspective view of an image capturing device according to an embodiment of the present disclosure;

[0043] Figure 25A FIG. 2 shows a side view of an electronic device according to an embodiment of the present disclosure;

[0044] Figure 25B FIG. 3 shows another side view of the electronic device according to the embodiment of the present disclosure; Figure 25A

[0045] Figure 25C FIG. 4 shows a system diagram of the electronic device according to the embodiment of the present disclosure; Figure 25A

[0046] Figure 26 FIG. 5 shows a side view of an electronic device according to another embodiment of the present disclosure;

[0047] Figure 27 FIG. 6 shows another side view of the electronic device according to the embodiment of the present disclosure;

[0048] Figure 28A FIG. 7 shows a side view of an electronic device according to another embodiment of the present disclosure;

[0049] Figure 28B FIG. 8 shows another side view of the electronic device according to the embodiment of the present disclosure; Figure 28A

[0050] Figure 29A FIG. 9 shows a schematic diagram of a configuration relationship of a light path turning element in an imaging optical system lens group according to the present disclosure;

[0051] Figure 29B FIG. 10 shows another schematic diagram of a configuration relationship of a light path turning element in an imaging optical system lens group according to the present disclosure; and

[0052] Figure 29C FIG. 11 shows a schematic diagram of a configuration relationship of two light path turning elements in an imaging optical system lens group according to the present disclosure.

[0053]

List of Symbols

[0054] 200, 300, 400, 500: electronic device

[0055] 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 100, 110, 120, 130, 140, 310, 320, 330, 410, 420, 430, 440, 450, 460, 470, 480, 490, 510, 520, 530, 540: image capturing device

[0056] 101: imaging lens​​​

[0057] 102: drive device group

[0058] 103: electronic photosensitive element

[0059] 104: image stabilization module

[0060] 201, 301, 401: flash module

[0061] 202: focus assist module

[0062] 203: image signal processor

[0063] 204, 504: user interface

[0064] 205: image software processor

[0065] 206: subject

[0066] ST: stop

[0067] S1, S2: diaphragm

[0068] E1: first lens

[0069] E2: second lens

[0070] E3: third lens

[0071] E4: fourth lens

[0072] E5: fifth lens

[0073] E6: sixth lens

[0074] E7: filter element

[0075] IMG: imaging surface

[0076] IS: electronic photosensitive element

[0077] IP: inflection point

[0078] CP: critical point

[0079] OA1: first optical axis

[0080] OA2: second optical axis

[0081] OA3: third optical axis

[0082] LF, LF1, LF2: light path folding element

[0083] LG: lens group

[0084] f: focal length of imaging optical system lens group

[0085] Fno: aperture value of the imaging optical system lens group

[0086] HFOV: half of the maximum view angle in the imaging optical system lens group

[0087] CT3: thickness of the third lens on the optical axis

[0088] CT4: thickness of the fourth lens on the optical axis

[0089] CT5: thickness of the fifth lens on the optical axis

[0090] N2: refractive index of the second lens

[0091] N4: refractive index of the fourth lens

[0092] V2: Abbe number of the second lens

[0093] V4: Abbe number of the fourth lens

[0094] T12: separation distance of the first lens and the second lens on the optical axis

[0095] T23: separation distance of the second lens and the third lens on the optical axis

[0096] T34: separation distance of the third lens and the fourth lens on the optical axis

[0097] T45: separation distance of the fourth lens and the fifth lens on the optical axis

[0098] T56: separation distance of the fifth lens and the sixth lens on the optical axis

[0099] SL: distance of the aperture to the imaging surface on the optical axis

[0100] R3: radius of curvature of the object side surface of the second lens

[0101] R4: radius of curvature of the image side surface of the second lens

[0102] R5: radius of curvature of the object side surface of the third lens

[0103] R6: radius of curvature of the image side surface of the third lens

[0104] R10: radius of curvature of the image side surface of the fifth lens

[0105] R11: radius of curvature of the object side surface of the sixth lens

[0106] R12: radius of curvature of the image side surface of the sixth lens

[0107] f3: focal length of the third lens

[0108] f4: focal length of the fourth lens

[0109] f5: focal length of the fifth lens

[0110] f6: focal length of the sixth lens

[0111] f23: combined focal length of the second lens and the third lens DETAILED DESCRIPTION

[0112] The present disclosure provides an imaging optical system lens, which includes six lenses in order from an object side to an image side of an optical path as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Each lens has an object side surface facing the object side and an image side surface facing the image side.

[0113] The first lens has negative refractive power, which helps to increase the view angle and increase the image size. The first lens object side surface near the optical axis can be concave, which helps to adjust the refractive power of the first lens and reduce the total length of the imaging optical system lens. The first lens image side surface near the optical axis can be convex, which helps to increase the view angle and adjust the refractive power of the first lens, improving the imaging quality of the imaging optical system lens.

[0114] The second lens can have positive refractive power, which can cooperate with the first lens to reduce the effective diameter of the overall imaging optical system lens. The second lens object side surface near the optical axis can be convex, which can adjust the surface shape and refractive power of the second lens to correct aberrations. The second lens image side surface near the optical axis can be concave, which can cooperate with the surface shape of the third lens to reduce the central spot size.

[0115] The third lens can have positive refractive power, which can cooperate with the fourth lens to correct aberrations such as spherical aberration.

[0116] The fifth lens can have positive refractive power, which helps to increase the image size and reduce the volume of the imaging optical system lens. In addition, at least one of the object side surface and the image side surface of the fifth lens can include at least one critical point, which can adjust the surface shape of at least one of the object side surface and the image side surface of the fifth lens, helping to reduce the coma of the peripheral field of view.

[0117] The sixth lens image side surface near the optical axis can be concave, which can adjust the back focal length to reduce the length of the overall imaging optical system lens.

[0118] At least one surface of at least one of the six lenses can include at least one inflection point. In this way, the field curvature value of the peripheral field of view is reduced, and the image resolution of the peripheral field of view is improved.

[0119] The focal length of the imaging optical system lens set is f, and the focal length of the sixth lens is f6, which satisfies the following condition: -0.63 < f / f6 < 1.20. In this way, the refractive power of the sixth lens can be adjusted, which helps to reduce the spherical aberration of the central field of view. Furthermore, it can satisfy the following condition: -0.37 < f / f6 < 1.00. Furthermore, it can satisfy the following condition: -0.35 < f / f6 < 0.90. Furthermore, it can satisfy the following condition: -0.25 < f / f6 < 0.55. Furthermore, it can satisfy the following condition: -0.20 < f / f6 < 0.45.

[0120] The thickness of the third lens on the optical axis is CT3, the thickness of the fourth lens on the optical axis is CT4, and the thickness of the fifth lens on the optical axis is CT5, which satisfies the following condition: 5.30 < (CT3+CT5) / CT4 < 15.0. In this way, the ratio of the sum of the thicknesses of the third lens and the fifth lens to the thickness of the fourth lens can be adjusted, which helps to maintain the thickness ratio of the third lens to the fifth lens to reduce the manufacturing difficulty. Furthermore, it can satisfy the following condition: 5.45 < (CT3+CT5) / CT4 < 9.10. Furthermore, it can satisfy the following condition: 4.50 < (CT3+CT5) / CT4 < 8.00.

[0121] The focal length of the imaging optical system lens set is f, and the focal length of the fourth lens is f4, which satisfies the following condition: -2.10 < f / f4 < 1.00. In this way, the refractive power of the fourth lens can be adjusted, which helps to balance the refractive power of the third lens to the fifth lens to achieve better light condensing effect. Furthermore, it can satisfy the following condition: -0.65 < f / f4 < 0.80. Furthermore, it can satisfy the following condition: -0.38 < f / f4 < 0.80. Furthermore, it can satisfy the following condition: -1.00 < f / f4 < 1.30. Furthermore, it can satisfy the following condition: -0.55 < f / f4 < 0.70.

[0122] The radius of curvature of the image side surface of the second lens is R4, and the radius of curvature of the image side surface of the sixth lens is R12, which satisfies the following condition: 1.35 < (R4+R12) / (R4-R12) < 5.00. In this way, the radii of curvature of the image side surface of the second lens and the sixth lens can be adjusted, which helps to balance the light condensing quality between the second lens and the sixth lens, and can reduce the spherical aberration of the central and adjacent fields of view. Furthermore, it can satisfy the following condition: 1.60 < (R4+R12) / (R4-R12) < 3.30. Furthermore, it can satisfy the following condition: (R4+R12) / (R4-R12) < 2.32. Furthermore, it can satisfy the following condition: 1.70 < (R4+R12) / (R4-R12) < 2.30.

[0123] The focal length of the imaging optical system lens set is f, the interval distance of the third lens and the fourth lens on the optical axis is T34, the interval distance of the fourth lens and the fifth lens on the optical axis is T45, and the interval distance of the fifth lens and the sixth lens on the optical axis is T56, which satisfy the following condition: 4.22 < f / (T34+T45+T56) < 15.0. In this way, the ratio of the focal length and the total interval distance between the third lens and the sixth lens can be adjusted, and a balance between the total length of the imaging optical system lens set and the assembly error can be achieved. Furthermore, it can satisfy the following condition: 3.70 < f / (T34+T45+T56) < 14.5. Furthermore, it can satisfy the following condition: 4.50 < f / (T34+T45+T56) < 14.0.

[0124] The radius of curvature of the image side surface of the fifth lens is R10, and the radius of curvature of the image side surface of the sixth lens is R12, which satisfy the following condition: R10 / R12 < -1.60. In this way, the ratio of the radius of curvature of the image side surface of the fifth lens and the radius of curvature of the image side surface of the sixth lens can be adjusted, which helps to maintain the light collecting ability of the fifth lens and the sixth lens and reduce the back focal length. Furthermore, it can satisfy the following condition: -4.00 < R10 / R12 < -1.55. Furthermore, it can satisfy the following condition: -3.50 < R10 / R12 < -1.70.

[0125] The focal length of the imaging optical system lens set is f, the interval distance of the first lens and the second lens on the optical axis is T12, and the interval distance of the second lens and the third lens on the optical axis is T23, which satisfy the following condition: 1.95 < f / (T12+T23) < 16.0. In this way, the ratio of the total interval distance of the first lens to the third lens and the focal length can be adjusted, which helps to maintain the distance between the first lens to the third lens and balance the volume of the imaging optical system lens set. Furthermore, it can satisfy the following condition: 1.70 < f / (T12+T23) < 3.80. Furthermore, it can satisfy the following condition: 1.80 < f / (T12+T23) < 3.75. Furthermore, it can satisfy the following condition: 2.00 < f / (T12+T23) < 3.60.

[0126] The focal length of the imaging optical system lens set is f, and the combined focal length of the second lens and the third lens is f23, which satisfy the following condition: -0.20 < f / f23 < 1.50. In this way, the total refractive power of the second lens and the third lens can be adjusted, which balances the refractive power of the first lens and helps to improve the viewing angle. Furthermore, it can satisfy the following condition: -0.10 < f / f23 < 0.92. Furthermore, it can satisfy the following condition: 0.20 < f / f23 < 1.50.

[0127] The imaging optical system lens set can further include an aperture, the distance from the aperture to the imaging surface on the optical axis is SL, the focal length of the imaging optical system lens set is f, and the following condition is met: 2.00 < SL / f < 2.90. In this way, the distance from the aperture to the imaging surface can be adjusted, which helps to strike a balance between the imaging size and the length of the lens group behind the aperture. Furthermore, the following condition can be met: 2.05 < SL / f < 2.75. Furthermore, the following condition can be met: 2.10 < SL / f < 2.50.

[0128] The focal length of the third lens is f3, and the focal length of the fifth lens is f5, which meet the following condition: -0.50 < f3 / f5 < 2.80. In this way, the ratio of the focal length of the third lens to the focal length of the fifth lens can be adjusted, which helps to reduce the size of the astigmatism in the center and adjacent fields of view. Furthermore, the following condition can be met: 0.20 < f3 / f5 < 2.70.

[0129] The focal length of the imaging optical system lens set is f, the thickness of the third lens on the optical axis is CT3, and the thickness of the fifth lens on the optical axis is CT5, which meet the following condition: 0.50 < f / (CT3+CT5) < 1.65. In this way, the average ratio of the focal length of the imaging optical system lens set to the thickness of the third lens and the fifth lens can be adjusted, which helps to strike a balance between the central light gathering quality and the volume of the imaging optical system lens set. Furthermore, the following condition can be met: 0.90 < f / (CT3+CT5) < 1.27.

[0130] The radius of curvature of the object side surface of the sixth lens is R11, and the radius of curvature of the image side surface of the sixth lens is R12, which meet the following condition: 5.00 < (R11+R12) / (R11-R12) < 20.0. In this way, the face shape of the sixth lens can be adjusted so that the sixth lens can cooperate with the fifth lens, which helps to improve the central imaging quality. Furthermore, the following condition can be met: 5.50 < (R11+R12) / (R11-R12) < 19.0. Furthermore, the following condition can be met: 7.00 < (R11+R12) / (R11-R12) < 17. Furthermore, the following condition can be met: 4.90 < (R11+R12) / (R11-R12) < 17.0.

[0131] The radius of curvature of the object side surface of the third lens is R5, and the radius of curvature of the image side surface of the third lens is R6, which satisfy the following condition: -5.00 < (R5+R6) / (R5-R6) < 1.50. In this way, the radius of curvature of the object side surface of the third lens and the radius of curvature of the image side surface of the third lens can be adjusted to cooperate with the second lens, which helps to reduce the effective diameter size and the volume of the imaging optical system lens set. Furthermore, it can satisfy the following condition: -1.70 < (R5+R6) / (R5-R6) < 0.40. Furthermore, it can satisfy the following condition: -1.68 < (R5+R6) / (R5-R6) < 0.38. Furthermore, it can satisfy the following condition: -1.30 < (R5+R6) / (R5-R6) < 0.18.

[0132] The focal length of the imaging optical system lens set is f, and the interval distance of the fourth lens and the fifth lens on the optical axis is T45, which satisfy the following condition: 18.0 < f / T45 < 65.0. In this way, the ratio of the lens interval distance of the fourth lens and the fifth lens to the focal length can be adjusted, which helps to balance between the total length of the imaging optical system lens set and the size of the central chromatic aberration. Furthermore, it can satisfy the following condition: 20.0 < f / T45 < 70.0. Furthermore, it can satisfy the following condition: 20.0 < f / T45 < 60.0.

[0133] The Abbe number of the second lens is V2, and the Abbe number of the fourth lens is V4, which satisfy the following condition: 12 < (V2+V4) / 2 < 24. In this way, the average of the Abbe number of the second lens and the Abbe number of the fourth lens can be adjusted, which helps to reduce the chromatic aberration of the peripheral field of view. Furthermore, it can satisfy the following condition: 15 < (V2+V4) / 2 < 20.

[0134] The focal length of the imaging optical system lens set is f, and the focal length of the fifth lens is f5, which satisfy the following condition: 0.18 < f / f5 < 1.00. In this way, the refractive power of the fifth lens can be adjusted, which helps to improve the image resolving power of the central field of view and the adjacent field of view.

[0135] The radius of curvature of the object side surface of the second lens is R3, and the interval distance of the first lens and the second lens on the optical axis is T12, which satisfy the following condition: 2.50 < R3 / T12 < 17.0. In this way, the ratio of the radius of curvature of the object side surface of the second lens to the interval distance of the first lens and the second lens can be adjusted, which helps to balance between the distribution of the relative positions of the first lens and the second lens and the reduction of the spherical aberration.

[0136] The refractive index of the second lens is N2 and the refractive index of the fourth lens is N4, which satisfy the following condition: 1.62 < (N2+N4) / 2 < 1.79. In this way, the average of the refractive index of the second lens and the refractive index of the fourth lens can be adjusted, which helps to increase the imaging size and reduce the effective diameter. Furthermore, the following condition can be satisfied: 1.65 < (N2+N4) / 2 < 1.75.

[0137] The interval distance of the fourth lens and the fifth lens on the optical axis is T45, and the thickness of the fourth lens on the optical axis is CT4, which satisfy the following condition: 0.05 < T45 / CT4 < 0.35. In this way, the ratio of the lens interval distance of the fourth lens to the fifth lens and the thickness of the fourth lens can be adjusted, which helps to balance the assembly error and manufacturability of the fourth lens.

[0138] The aperture value of the imaging optical system lens is Fno, which satisfy the following condition: 1.95 < Fno < 2.20. In this way, the lens aperture value can be adjusted, which helps to increase the aperture size, maintain the illumination of the peripheral field of view, avoid the inability to image, and maintain a certain imaging quality.

[0139] Half of the maximum viewing angle of the imaging optical system lens is HFOV, which satisfy the following condition: 58 degrees < HFOV. In this way, the viewing angle size can be adjusted, which helps to obtain a wider image angle.

[0140] The technical features of the imaging optical system lens provided by the present disclosure can be combined to achieve the corresponding effects.

[0141] The imaging optical system lens provided by the present disclosure can be made of glass or plastic. If the lens is made of glass, the degree of freedom of the refractive power configuration of the imaging optical system lens can be increased, and the glass lens can be made by grinding or molding. If the lens is made of plastic, the production cost can be effectively reduced. In addition, a spherical surface or an aspherical surface (ASP) can be provided on the lens surface. The spherical lens can reduce the manufacturing difficulty, and if an aspherical surface is provided on the lens surface, more control variables can be obtained to reduce aberration, reduce the number of lenses, and effectively reduce the total length of the imaging optical system lens. The aspherical surface can be made by plastic injection molding or molded glass lens.

[0142] The imaging optical system lens provided by the present disclosure can selectively add additives in any of the above lens materials to produce light absorption or light interference effects, thereby changing the transmittance of the lens for specific wavelength bands of light and reducing stray light and color deviation. For example, the additives can have the function of filtering out 600-800 nm wavelength band light in the system to reduce excess red light or infrared light, or can filter out 350-450 nm wavelength band light to reduce blue light or ultraviolet light in the system. Therefore, the additives can prevent specific wavelength bands of light from interfering with imaging. In addition, the additives can be uniformly mixed in plastic and manufactured into lenses using injection molding technology. Furthermore, the additives can also be configured on the coating of the lens surface to provide the above-mentioned effects.

[0143] In the imaging optical system lens provided by the present disclosure, if the lens surface is aspherical, it means that the entire or a part of the optically effective area of the lens surface is aspherical.

[0144] In the imaging optical system lens provided by the present disclosure, if the lens surface is convex and the position of the convex surface is not specified, it means that the lens surface can be convex near the optical axis. If the lens surface is concave and the position of the concave surface is not specified, it means that the lens surface can be concave near the optical axis. In the imaging optical system lens provided by the present disclosure, if the lens has positive refractive power or negative refractive power, or the focal length of the lens, it can refer to the refractive power or focal length near the optical axis of the lens.

[0145] In the imaging optical system lens provided by the present disclosure, the critical point is a tangent point on the lens surface, which is tangent to a tangent plane perpendicular to the optical axis, except for the intersection with the optical axis. The inflection point is the intersection of the positive and negative changes in the curvature of the lens surface.

[0146] The imaging surface of the imaging optical system lens provided by the present disclosure can be a plane or a curved surface with any curvature, especially a concave surface facing the object side. In addition, in the imaging optical system lens of the present disclosure, one or more imaging correction elements (flat field elements, etc.) can be selectively arranged between the lens closest to the imaging surface in the imaging light path and the imaging surface to achieve the effect of correcting the image (image curvature, etc.). The optical properties of the imaging correction elements, such as curvature, thickness, refractive index, position, surface shape (convex or concave, spherical or aspherical, diffractive surface and Fresnel surface, etc.), can be adjusted according to the requirements of the image capturing device. In general, the preferred imaging correction element configuration is to set a thin flat concave element with a concave surface facing the object side near the imaging surface.

[0147] The present disclosure provides an imaging optical system lens set. The imaging optical system lens set can selectively include at least one light path folding element, such as a prism or a mirror, between the object and the image plane. The imaging optical system lens set can have a high flexibility in spatial configuration, and the total length of the imaging optical system lens set can not limit the thinness of the electronic device. Further, the imaging optical system lens set can selectively include at least one diaphragm, such as an aperture diaphragm, a glare diaphragm, or a field diaphragm, to reduce stray light and improve image quality. Figure 29A and Figure 29B wherein Figure 29A FIG. 1 shows a schematic diagram of a configuration of a light path folding element in an imaging optical system lens set according to the present disclosure; Figure 29B FIG. 2 shows another schematic diagram of a configuration of a light path folding element in an imaging optical system lens set according to the present disclosure. As shown in Figure 29A and Figure 29B The imaging optical system lens set can sequentially include a first optical axis OA1, a light path folding element LF, and a second optical axis OA2 along the light path from the object (not shown) to the image plane IMG. The light path folding element LF can be disposed between the object and the lens group LG of the imaging optical system lens set, as shown in Figure 29A or disposed between the lens group LG of the imaging optical system lens set and the image plane IMG, as shown in Figure 29B Further, FIG. 4 shows a schematic diagram of a configuration of two light path folding elements LF1, LF2 in an imaging optical system lens set according to the present disclosure. As shown in Figure 29C and Figure 29C The imaging optical system lens set can sequentially include a first optical axis OA1, a light path folding element LF1, a second optical axis OA2, a light path folding element LF2, and a third optical axis OA3 along the light path from the object (not shown) to the image plane IMG. The light path folding element LF1 can be disposed between the object and the lens group LG of the imaging optical system lens set, and the light path folding element LF2 can be disposed between the lens group LG of the imaging optical system lens set and the image plane IMG. The imaging optical system lens set can selectively include more than three light path folding elements, and the present disclosure is not limited to the types, numbers, and positions of the light path folding elements shown in the figures.

[0148] In addition, the imaging optical system lens set according to the present disclosure can include at least one diaphragm, such as an aperture diaphragm, a glare diaphragm, or a field diaphragm, to reduce stray light and improve image quality.

[0149] The imaging optical system lens provided by the present disclosure can be a front group or a middle group. The front group means that the aperture is arranged between the object and the first lens. The middle group means that the aperture is arranged between the first lens and the image plane. If the aperture is a front group, the exit pupil of the imaging optical system lens and the image plane can have a longer distance, so that the imaging optical system lens has a telecentric effect and the efficiency of the image received by the CCD or CMOS of the electronic photosensitive element can be increased. If the aperture is a middle group, the field of view of the imaging optical system lens can be expanded, so that the imaging optical system lens has the advantage of a wide-angle lens.

[0150] The variable aperture element can be a mechanical member or a light control element, which can control the size and shape of the aperture by electricity or electrical signals. The mechanical member can include movable members such as a blade group and a shielding plate. The light control element can include a shielding material such as a light filtering element, an electrochromic material, and a liquid crystal layer. The variable aperture element can enhance the image adjustment capability by controlling the light amount or the exposure time of the image. In addition, the variable aperture element can also be the aperture of the present disclosure, which can adjust the image quality such as the depth of field or the exposure speed by changing the aperture value.

[0151] The imaging optical system lens provided by the present disclosure can be applied in various electronic devices such as a 3D image capturing device, a digital camera, a mobile product, a digital tablet, a smart television, a network monitoring device, a motion sensing game console, a driving recorder, a reversing device, a wearable product, a drone, and the like.

[0152] The present disclosure provides an image capturing device, which includes the imaging optical system lens and an electronic photosensitive element. The electronic photosensitive element is arranged on the image plane of the imaging optical system lens. By arranging the first lens with a negative refractive power and matching the ratio of the sixth lens and the focal length of the whole imaging optical system lens, the viewing angle and the image size can be increased, and the spherical aberration of the central field of view can be reduced. Preferably, the image capturing device can further include a lens barrel, a support device, or a combination thereof.

[0153] The present disclosure provides an electronic device, which includes the image capturing device. In this way, the imaging quality can be improved. Preferably, the electronic device can further include a control unit, a display unit, a storage unit, a temporary storage unit, or a combination thereof.

[0154] According to the above-mentioned embodiments, the following specific embodiments are proposed in detail with reference to the accompanying drawings.

[0155] <First Embodiment>

[0156] Please refer to Figure 1 and Figure 2 , wherein Figure 1A schematic diagram of an image-capturing device 1 according to a first embodiment of the present disclosure is shown. Figure 2 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the first embodiment. Figure 1 As can be seen, the imaging device 1 of the first embodiment includes an imaging optical system lens group (not otherwise labeled) and an electronic photosensitive element IS. The imaging optical system lens group includes, in sequence from the object side to the image side of the optical path, a first lens E1, an aperture stop S1, a second lens E2, an aperture ST, a third lens E3, an aperture stop S2, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter element E7, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG of the imaging optical system lens group. The imaging optical system lens group includes six lenses (E1, E2, E3, E4, E5, E6), and there are no other interposed lenses between the six lenses.

[0157] The first lens E1 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis; both are aspherical. Additionally, in conjunction with reference... Figure 23 The diagram illustrates some parameters according to the first embodiment, the inflection point IP of each lens, and the critical point CP of the fifth lens. Figure 23 It can be seen that the object-side surface of the first lens contains two inflection points IP, and the image-side surface of the first lens contains two inflection points IP.

[0158] The second lens E2 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis; both are aspherical. Additionally, the object-side surface of the second lens includes a curvature point IP (marked at...). Figure 23 ).

[0159] The third lens E3 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is also convex near the optical axis; both are aspherical. Additionally, the object-side surface of the third lens includes a curvature point IP (marked at...). Figure 23 ).

[0160] The fourth lens, E4, has negative refractive power and is made of plastic. Both its object-side and image-side surfaces are concave near the optical axis, and both are aspherical. Additionally, the image-side surface of the fourth lens contains two inflection points IP (marked at...). Figure 23 ).

[0161] The fifth lens, E5, has positive refractive power and is made of plastic. Both its object-side and image-side surfaces are convex near the optical axis, and both are aspherical. Additionally, the object-side surface of the fifth lens includes a curvature point IP (marked at...). Figure 23 And its off-axis location contains a critical point CP (marked at...). Figure 23), the fifth lens image-side surface contains two inflection points IP (indicated by Figure 23 ).

[0162] The sixth lens E6 has a negative refractive power and is made of plastic. The object-side surface of the sixth lens E6 is convex near the optical axis, and the image-side surface of the sixth lens E6 is concave near the optical axis, and both are aspherical. In addition, the object-side surface of the sixth lens E6 contains two inflection points IP (indicated by Figure 23 ), the image-side surface of the sixth lens E6 contains three inflection points IP (indicated by Figure 23 ).

[0163] The filter element E7 is made of glass and is disposed between the sixth lens E6 and the imaging plane IMG without affecting the focal length of the imaging optical system lens.

[0164] The aspherical curve equation of each lens is shown as follows:

[0165]

[0166] ; wherein:

[0167] X: the displacement of the intersection point of the aspherical surface and the optical axis to the point on the aspherical surface which is Y away from the optical axis and parallel to the optical axis;

[0168] Y: the perpendicular distance of the point on the aspherical curve to the optical axis;

[0169] R: the radius of curvature;

[0170] k: the conic coefficient; and

[0171] Ai: the i-th order aspherical coefficient.

[0172] In the imaging optical system lens of the first embodiment, the focal length of the imaging optical system lens is f, the aperture value (f-number) of the imaging optical system lens is Fno, and half of the maximum viewing angle in the imaging optical system lens is HFOV, and the values are as follows: f = 1.67 mm; Fno = 2.03; and HFOV = 62.18 degrees.

[0173] In the imaging optical system lens of the first embodiment, the thickness of the third lens E3 on the optical axis is CT3, the thickness of the fourth lens E4 on the optical axis is CT4, and the thickness of the fifth lens E5 on the optical axis is CT5, and they satisfy the following condition: (CT3 + CT5) / CT4 = 6.08.

[0174] In the imaging optical system lens of the first embodiment, the refractive index of the second lens E2 is N2, and the refractive index of the fourth lens E4 is N4, and they satisfy the following condition: (N2 + N4) / 2 = 1.69.

[0175] In the imaging optical system lens of the first embodiment, the radius of curvature of the image-side surface of the second lens is R4, the radius of curvature of the object-side surface of the third lens is R5, the radius of curvature of the image-side surface of the third lens is R6, the radius of curvature of the object-side surface of the sixth lens is R11, and the radius of curvature of the image-side surface of the sixth lens is R12, which satisfy the following conditions: (R11+R12) / (R11-R12)=11.03; (R4+R12) / (R4-R12)=1.84; and (R5+R6) / (R5-R6)=0.15.

[0176] In the imaging optical system lens of the first embodiment, the Abbe number of the second lens E2 is V2, and the Abbe number of the fourth lens E4 is V4, which satisfy the following condition: (V2+V4) / 2=18.38.

[0177] In the imaging optical system lens of the first embodiment, the focal length of the imaging optical system lens is f, the thickness of the third lens E3 on the optical axis is CT3, and the thickness of the fifth lens E5 on the optical axis is CT5, which satisfy the following condition: f / (CT3+CT5)=1.05.

[0178] In the imaging optical system lens of the first embodiment, the focal length of the imaging optical system lens is f, the interval distance of the first lens E1 and the second lens E2 on the optical axis is T12, the interval distance of the second lens E2 and the third lens E3 on the optical axis is T23, the interval distance of the third lens E3 and the fourth lens E4 on the optical axis is T34, the interval distance of the fourth lens E4 and the fifth lens E5 on the optical axis is T45, and the interval distance of the fifth lens E5 and the sixth lens E6 on the optical axis is T56, which satisfy the following conditions: f / (T12+T23)=2.19; and f / (T34+T45+T56)=5.21.

[0179] In the imaging optical system lens of the first embodiment, the focal length of the imaging optical system lens is f, the focal length of the fourth lens E4 is f4, the focal length of the fifth lens E5 is f5, the focal length of the sixth lens E6 is f6, and the combined focal length of the second lens E2 and the third lens E3 is f23, which satisfy the following conditions: f / f23=0.81; f / f4=-0.24; f / f5=0.53; and f / f6=-0.04.

[0180] In the imaging optical system lens of the first embodiment, the focal length of the imaging optical system lens is f, and the interval distance of the fourth lens E4 and the fifth lens E5 on the optical axis is T45, which satisfy the following condition: f / T45=42.71.

[0181] In the imaging optical system lens of the first embodiment, the focal length of the third lens E3 is f3, and the focal length of the fifth lens E5 is f5, which satisfy the following condition: f3 / f5=0.75.

[0182] In the imaging optical system lens group of the first embodiment, the radius of curvature of the image-side surface of the fifth lens is R10, and the radius of curvature of the image-side surface of the sixth lens is R12, which satisfies the following condition: R10 / R12=-2.70.

[0183] In the imaging optical system lens group of the first embodiment, the radius of curvature of the object-side surface of the second lens is R3, and the distance between the first lens E1 and the second lens E2 on the optical axis is T12, which satisfies the following condition: R3 / T12=3.99.

[0184] In the imaging optical system lens group of the first embodiment, the distance from the aperture ST to the imaging plane IMG on the optical axis is SL, and the focal length of the imaging optical system lens group is f, which satisfies the following condition: SL / f = 2.24.

[0185] In the imaging optical system lens group of the first embodiment, the distance between the fourth lens E4 and the fifth lens E5 on the optical axis is T45, and the thickness of the fourth lens E4 on the optical axis is CT4, which satisfies the following condition: T45 / CT4=0.15.

[0186] Please also refer to Table 1 and Table 2 below.

[0187]

[0188]

[0189]

[0190] Table 1 is... Figure 1 The first embodiment provides detailed structural data, where the units for radius of curvature, thickness, and focal length are mm, and surfaces 0-18 sequentially represent the surfaces from the object side to the image side, with the refractive index measured at a reference wavelength. Table 2 shows the aspherical data in the first embodiment, where k represents the cone coefficient in the aspherical curve equation, and A4-A28 represent the 4th-28th order aspherical coefficients of each surface. Furthermore, the tables for the following embodiments are corresponding schematic diagrams and aberration curves for each embodiment. The definitions of the data in the tables are the same as those in Tables 1 and 2 of the first embodiment, and will not be repeated here.

[0191] <Second Embodiment>

[0192] Please refer to Figure 3 as well as Figure 4 ,in Figure 3 A schematic diagram of an image-capturing device 2 according to a second embodiment of the present disclosure is shown. Figure 4 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the second embodiment. Figure 3As shown in FIG. 2, the image pickup device 2 of the second embodiment includes an imaging optical system lens group (not labeled separately) and an electronic photosensitive element IS. The imaging optical system lens group includes, in order from the object side to the image side of the optical path, a first lens E1, a stop S1, a second lens E2, an aperture ST, a third lens E3, a stop S2, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter element E7, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG of the imaging optical system lens group. The imaging optical system lens group includes six lenses (E1, E2, E3, E4, E5, E6) without any other intervening lenses between the six lenses.

[0193] The first lens E1 has a negative refractive power and is made of plastic. The object side surface of the first lens E1 is concave near the optical axis, and the image side surface of the first lens E1 is convex near the optical axis. Both the object side surface and the image side surface of the first lens E1 are aspherical surfaces. In addition, the object side surface of the first lens E1 includes one inflection point, and the image side surface of the first lens E1 includes two inflection points.

[0194] The second lens E2 has a positive refractive power and is made of plastic. The object side surface of the second lens E2 is convex near the optical axis, and the image side surface of the second lens E2 is concave near the optical axis. Both the object side surface and the image side surface of the second lens E2 are aspherical surfaces. In addition, the object side surface of the second lens E2 includes two inflection points.

[0195] The third lens E3 has a positive refractive power and is made of plastic. The object side surface of the third lens E3 is convex near the optical axis, and the image side surface of the third lens E3 is convex near the optical axis. Both the object side surface and the image side surface of the third lens E3 are aspherical surfaces.

[0196] The fourth lens E4 has a positive refractive power and is made of plastic. The object side surface of the fourth lens E4 is concave near the optical axis, and the image side surface of the fourth lens E4 is convex near the optical axis. Both the object side surface and the image side surface of the fourth lens E4 are aspherical surfaces. In addition, the image side surface of the fourth lens E4 includes three inflection points.

[0197] The fifth lens E5 has a positive refractive power and is made of plastic. The object side surface of the fifth lens E5 is concave near the optical axis, and the image side surface of the fifth lens E5 is convex near the optical axis. Both the object side surface and the image side surface of the fifth lens E5 are aspherical surfaces. In addition, the object side surface of the fifth lens E5 includes four inflection points and includes two critical points away from the optical axis, and the image side surface of the fifth lens E5 includes two inflection points.

[0198] The sixth lens E6 has a negative refractive power and is made of plastic. The object side surface of the sixth lens E6 is convex near the optical axis, and the image side surface of the sixth lens E6 is concave near the optical axis. Both the object side surface and the image side surface of the sixth lens E6 are aspherical surfaces. In addition, the object side surface of the sixth lens E6 includes two inflection points, and the image side surface of the sixth lens E6 includes two inflection points.

[0199] The filter element E7 is made of glass and is disposed between the sixth lens E6 and the imaging surface IMG without affecting the focal length of the imaging optical system lens group.

[0200] In addition, the following Table 3 and Table 4 are provided for reference.

[0201]

[0202]

[0203]

[0204]

[0205] In the second embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions of the parameters in the table below are the same as in the first embodiment, and will not be repeated here.

[0206] By referring to Tables 3 and 4, the following data can be calculated:

[0207]

[0208] <Third Embodiment>

[0209] Please refer to Figure 5 as well as Figure 6 ,in Figure 5 A schematic diagram of an image-capturing device 3 according to a third embodiment of the present disclosure is shown. Figure 6 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the third embodiment. Figure 5 As can be seen, the imaging device 3 of the third embodiment includes an imaging optical system lens group (not otherwise labeled) and an electronic photosensitive element IS. The imaging optical system lens group includes, in sequence from the object side to the image side of the optical path, a first lens E1, an aperture stop S1, a second lens E2, an aperture ST, a third lens E3, an aperture stop S2, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter element E7, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG of the imaging optical system lens group. The imaging optical system lens group includes six lenses (E1, E2, E3, E4, E5, E6), and there are no other interposed lenses between the six lenses.

[0210] The first lens E1 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis, both of which are aspherical. In addition, the object-side surface of the first lens contains two inflection points, and the image-side surface of the first lens contains two inflection points.

[0211] The second lens E2 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis, both of which are aspherical. In addition, the object-side surface of the second lens contains a point of inflection.

[0212] The third lens E3 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is also convex near the optical axis. Both are aspherical.

[0213] The fourth lens E4 has negative refractive power and is made of plastic material. The object-side surface of the fourth lens E4 is concave near the optical axis, and the image-side surface of the fourth lens E4 is convex near the optical axis. Both the object-side surface and the image-side surface of the fourth lens E4 are aspheric surfaces. In addition, the image-side surface of the fourth lens E4 includes three inflection points.

[0214] The fifth lens E5 has positive refractive power and is made of plastic material. The object-side surface of the fifth lens E5 is convex near the optical axis, and the image-side surface of the fifth lens E5 is convex near the optical axis. Both the object-side surface and the image-side surface of the fifth lens E5 are aspheric surfaces. In addition, the object-side surface of the fifth lens E5 includes one inflection point and has a critical point away from the optical axis. The image-side surface of the fifth lens E5 includes two inflection points.

[0215] The sixth lens E6 has negative refractive power and is made of plastic material. The object-side surface of the sixth lens E6 is convex near the optical axis, and the image-side surface of the sixth lens E6 is concave near the optical axis. Both the object-side surface and the image-side surface of the sixth lens E6 are aspheric surfaces. In addition, the object-side surface of the sixth lens E6 includes two inflection points. The image-side surface of the sixth lens E6 includes three inflection points.

[0216] The filter element E7 is made of glass material and is disposed between the sixth lens E6 and the imaging surface IMG without affecting the focal length of the imaging optical system.

[0217] In combination with Table 5 and Table 6, the following data can be calculated:

[0218]

[0219]

[0220]

[0221]

[0222] In the third embodiment, the curve equation of the aspheric surface is in the form of the first embodiment. In addition, the definitions of the parameters in the following tables are the same as those in the first embodiment, which are not described herein.

[0223] In combination with Table 5 and Table 6, the following data can be calculated:

[0224]

[0225] <Fourth Embodiment>

[0226] Please refer to Figure 7 and Figure 8 wherein Figure 7 a schematic diagram of an image capturing device 4 according to the fourth embodiment of the present disclosure is shown, Figure 8 the ball aberration, the astigmatism, and the distortion curves of the fourth embodiment are sequentially shown from left to right. From the ball aberration curve, Figure 7As shown in FIG. 4, the image pickup device 4 of the fourth embodiment includes an imaging optical system lens group (not labeled separately) and an electronic photosensitive element IS. The imaging optical system lens group includes, in order from the object side to the image side of the optical path, a first lens E1, a stop S1, a second lens E2, an aperture ST, a third lens E3, a stop S2, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter element E7, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG of the imaging optical system lens group. The imaging optical system lens group includes six lenses (E1, E2, E3, E4, E5, E6) without any other intervening lenses between the six lenses.

[0227] The first lens E1 has a negative refractive power and is made of plastic. The object side surface of the first lens is concave near the optical axis, and the image side surface of the first lens is convex near the optical axis. Both the object side surface and the image side surface of the first lens are aspherical surfaces. In addition, the object side surface of the first lens includes two inflection points, and the image side surface of the first lens includes two inflection points.

[0228] The second lens E2 has a positive refractive power and is made of plastic. The object side surface of the second lens is convex near the optical axis, and the image side surface of the second lens is concave near the optical axis. Both the object side surface and the image side surface of the second lens are aspherical surfaces. In addition, the object side surface of the second lens includes one inflection point.

[0229] The third lens E3 has a positive refractive power and is made of plastic. The object side surface of the third lens is convex near the optical axis, and the image side surface of the third lens is convex near the optical axis. Both the object side surface and the image side surface of the third lens are aspherical surfaces.

[0230] The fourth lens E4 has a positive refractive power and is made of plastic. The object side surface of the fourth lens is concave near the optical axis, and the image side surface of the fourth lens is convex near the optical axis. Both the object side surface and the image side surface of the fourth lens are aspherical surfaces. In addition, the image side surface of the fourth lens includes three inflection points.

[0231] The fifth lens E5 has a positive refractive power and is made of plastic. The object side surface of the fifth lens is concave near the optical axis, and the image side surface of the fifth lens is convex near the optical axis. Both the object side surface and the image side surface of the fifth lens are aspherical surfaces. In addition, the object side surface of the fifth lens includes two inflection points and includes two critical points away from the optical axis. The image side surface of the fifth lens includes two inflection points.

[0232] The sixth lens E6 has a negative refractive power and is made of plastic. The object side surface of the sixth lens is convex near the optical axis, and the image side surface of the sixth lens is concave near the optical axis. Both the object side surface and the image side surface of the sixth lens are aspherical surfaces. In addition, the object side surface of the sixth lens includes two inflection points, and the image side surface of the sixth lens includes two inflection points.

[0233] The filter element E7 is made of glass and is disposed between the sixth lens E6 and the imaging surface IMG without affecting the focal length of the imaging optical system lens group.

[0234] In addition, the following Table 7 and Table 8 are provided for reference.

[0235]

[0236]

[0237]

[0238]

[0239] In the fourth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions of the parameters in the table below are the same as in the first embodiment, and will not be repeated here.

[0240] By referring to Tables 7 and 8, the following data can be calculated:

[0241]

[0242] <Fifth Embodiment>

[0243] Please refer to Figure 9 as well as Figure 10 ,in Figure 9 A schematic diagram of an image-capturing device 5 according to the fifth embodiment of this disclosure is shown. Figure 10 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the fifth embodiment. Figure 9 As can be seen, the imaging device 5 of the fifth embodiment includes an imaging optical system lens group (not otherwise labeled) and an electronic photosensitive element IS. The imaging optical system lens group includes, in sequence from the object side to the image side of the optical path, a first lens E1, an aperture stop S1, a second lens E2, an aperture ST, a third lens E3, an aperture stop S2, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter element E7, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG of the imaging optical system lens group. The imaging optical system lens group includes six lenses (E1, E2, E3, E4, E5, E6), and there are no other interposed lenses between the six lenses.

[0244] The first lens E1 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis, both of which are aspherical. In addition, the object-side surface of the first lens contains two inflection points, and the image-side surface of the first lens contains two inflection points.

[0245] The second lens E2 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis, both of which are aspherical. In addition, the object-side surface of the second lens contains a point of inflection.

[0246] The third lens E3 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is also convex near the optical axis. Both are aspherical.

[0247] The fourth lens E4 has positive refractive power and is made of plastic material. The object-side surface of the fourth lens is convex near the optical axis, and the image-side surface of the fourth lens is concave near the optical axis, and both surfaces are aspherical. In addition, the object-side surface of the fourth lens includes one inflection point, and the image-side surface of the fourth lens includes two inflection points.

[0248] The fifth lens E5 has positive refractive power and is made of plastic material. The object-side surface of the fifth lens is concave near the optical axis, and the image-side surface of the fifth lens is convex near the optical axis, and both surfaces are aspherical. In addition, the object-side surface of the fifth lens includes four inflection points and includes two critical points away from the optical axis, and the image-side surface of the fifth lens includes two inflection points.

[0249] The sixth lens E6 has positive refractive power and is made of plastic material. The object-side surface of the sixth lens is convex near the optical axis, and the image-side surface of the sixth lens is concave near the optical axis, and both surfaces are aspherical. In addition, the object-side surface of the sixth lens includes two inflection points, and the image-side surface of the sixth lens includes three inflection points.

[0250] The filter element E7 is made of glass material, which is arranged between the sixth lens E6 and the imaging surface IMG and does not affect the focal length of the imaging optical system lens group.

[0251] In combination with the following Table 9 and Table 10.

[0252]

[0253]

[0254]

[0255]

[0256] In the fifth embodiment, the curve equation of the aspherical surface is in the form of the first embodiment. In addition, the definitions of the parameters in the following tables are the same as those in the first embodiment, which are not described herein.

[0257] In combination with Table 9 and Table 10, the following data can be calculated:

[0258]

[0259] <Sixth Embodiment>

[0260] Please refer to Figure 11 and Figure 12 , wherein Figure 11 a schematic diagram of an image capturing device 6 according to the sixth embodiment of the present disclosure is shown, Figure 12 the sagittal aberration, the astigmatism and the distortion curves of the sixth embodiment are sequentially shown from left to right. From Figure 11As shown in FIG. 6, the image pickup device 6 of the sixth embodiment includes an imaging optical system lens group (not labeled separately) and an electronic photosensitive element IS. The imaging optical system lens group includes, in order from the object side to the image side of the optical path, a first lens E1, a stop S1, a second lens E2, an aperture ST, a third lens E3, a stop S2, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter element E7, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG of the imaging optical system lens group. The imaging optical system lens group includes six lenses (E1, E2, E3, E4, E5, E6) without any other intervening lenses between the six lenses.

[0261] The first lens E1 has a negative refractive power and is made of plastic. The object side surface of the first lens is concave near the optical axis, and the image side surface of the first lens is convex near the optical axis. Both the object side surface and the image side surface of the first lens are aspherical surfaces. In addition, the object side surface of the first lens includes one inflection point, and the image side surface of the first lens includes one inflection point.

[0262] The second lens E2 has a positive refractive power and is made of plastic. The object side surface of the second lens is convex near the optical axis, and the image side surface of the second lens is concave near the optical axis. Both the object side surface and the image side surface of the second lens are aspherical surfaces. In addition, the object side surface of the second lens includes one inflection point.

[0263] The third lens E3 has a positive refractive power and is made of plastic. The object side surface of the third lens is convex near the optical axis, and the image side surface of the third lens is concave near the optical axis. Both the object side surface and the image side surface of the third lens are aspherical surfaces. In addition, the image side surface of the third lens includes one inflection point.

[0264] The fourth lens E4 has a negative refractive power and is made of plastic. The object side surface of the fourth lens is convex near the optical axis, and the image side surface of the fourth lens is concave near the optical axis. Both the object side surface and the image side surface of the fourth lens are aspherical surfaces. In addition, the object side surface of the fourth lens includes one inflection point, and the image side surface of the fourth lens includes two inflection points.

[0265] The fifth lens E5 has a positive refractive power and is made of plastic. The object side surface of the fifth lens is convex near the optical axis, and the image side surface of the fifth lens is convex near the optical axis. Both the object side surface and the image side surface of the fifth lens are aspherical surfaces. In addition, the object side surface of the fifth lens includes two inflection points and includes one critical point away from the optical axis, and the image side surface of the fifth lens includes two inflection points.

[0266] The sixth lens E6 has a negative refractive power and is made of plastic. The object side surface of the sixth lens is convex near the optical axis, and the image side surface of the sixth lens is concave near the optical axis. Both the object side surface and the image side surface of the sixth lens are aspherical surfaces. In addition, the object side surface of the sixth lens includes two inflection points, and the image side surface of the sixth lens includes three inflection points.

[0267] The filter element E7 is made of glass and is disposed between the sixth lens E6 and the imaging surface IMG without affecting the focal length of the imaging optical system lens group.

[0268] In addition, the following Table XI and Table XII are provided for reference.

[0269]

[0270]

[0271]

[0272]

[0273] In the sixth embodiment, the aspherical surface equation is expressed in the form of the first embodiment. In addition, the definitions of the following table parameters are the same as those of the first embodiment, which are not described herein.

[0274] The following data can be calculated according to Table 11 and Table 12:

[0275]

[0276] Seventh Embodiment

[0277] Please refer to Figure 13 and Figure 14 wherein Figure 13 a schematic diagram of an image pickup device 7 according to the seventh embodiment of the present disclosure is shown, Figure 14 The left-to-right sequence is the spherical aberration, the astigmatism and the distortion curve of the seventh embodiment. From Figure 13 It can be seen that the image pickup device 7 of the seventh embodiment comprises an imaging optical system lens group (not labeled separately) and an electronic photosensitive element IS. The imaging optical system lens group comprises, in sequence from the object side to the image side of the optical path, a first lens E1, a stop S1, a second lens E2, an aperture ST, a third lens E3, a stop S2, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter element E7 and an imaging surface IMG, and the electronic photosensitive element IS is arranged on the imaging surface IMG of the imaging optical system lens group, wherein the imaging optical system lens group comprises six lenses (E1, E2, E3, E4, E5, E6) without other lenses interposed between them.

[0278] The first lens E1 has a negative refractive power and is made of plastic, the object side surface thereof is concave near the optical axis, the image side surface thereof is convex near the optical axis, and both are aspherical surfaces. In addition, the object side surface of the first lens comprises two inflection points, and the image side surface of the first lens comprises two inflection points.

[0279] The second lens E2 has a positive refractive power and is made of plastic, the object side surface thereof is convex near the optical axis, the image side surface thereof is concave near the optical axis, and both are aspherical surfaces. In addition, the object side surface of the second lens comprises one inflection point.

[0280] The third lens E3 has a positive refractive power and is made of plastic, the object side surface thereof is convex near the optical axis, the image side surface thereof is convex near the optical axis, and both are aspherical surfaces.

[0281] The fourth lens E4 has positive refractive power and is made of plastic. The object-side surface of the fourth lens E4 is concave near the optical axis, and the image-side surface of the fourth lens E4 is convex near the optical axis. Both the object-side surface and the image-side surface of the fourth lens E4 are aspheric surfaces. In addition, the image-side surface of the fourth lens E4 includes three inflection points.

[0282] The fifth lens E5 has positive refractive power and is made of plastic. The object-side surface of the fifth lens E5 is concave near the optical axis, and the image-side surface of the fifth lens E5 is convex near the optical axis. Both the object-side surface and the image-side surface of the fifth lens E5 are aspheric surfaces. In addition, the object-side surface of the fifth lens E5 includes two inflection points and has two critical points away from the optical axis. The image-side surface of the fifth lens E5 includes two inflection points.

[0283] The sixth lens E6 has negative refractive power and is made of plastic. The object-side surface of the sixth lens E6 is convex near the optical axis, and the image-side surface of the sixth lens E6 is concave near the optical axis. Both the object-side surface and the image-side surface of the sixth lens E6 are aspheric surfaces. In addition, the object-side surface of the sixth lens E6 includes two inflection points. The image-side surface of the sixth lens E6 includes two inflection points.

[0284] The filter element E7 is made of glass and is disposed between the sixth lens E6 and the imaging surface IMG without affecting the focal length of the imaging optical system lens group.

[0285] In combination with Table XIII and Table XIV below.

[0286]

[0287]

[0288]

[0289]

[0290] In the seventh embodiment, the curve equation of the aspheric surface is in the form of the first embodiment. In addition, the definitions of the parameters in the following tables are the same as those in the first embodiment, which are not described herein.

[0291] In combination with Table XIII and Table XIV, the following data can be calculated:

[0292]

[0293] Eighth Embodiment

[0294] Please refer to Figure 15 and Figure 16 wherein Figure 15 a schematic diagram of an image capturing device 8 according to the eighth embodiment of the present disclosure is shown, Figure 16 the left-to-right sequence is the curve graph of the spherical aberration, the astigmatism and the distortion of the eighth embodiment. From Figure 15As shown in FIG. 8, the image pickup device 8 of the eighth embodiment includes an imaging optical system lens group (not labeled separately) and an electronic photosensitive element IS. The imaging optical system lens group includes, in order from the object side to the image side of the optical path, a first lens E1, a stop S1, a second lens E2, an aperture ST, a third lens E3, a stop S2, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter element E7, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG of the imaging optical system lens group. The imaging optical system lens group includes six lenses (E1, E2, E3, E4, E5, E6) without any other intervening lenses therebetween.

[0295] The first lens E1 has a negative refractive power and is made of plastic. The object side surface thereof is concave near the optical axis, and the image side surface thereof is convex near the optical axis. Both of the surfaces are aspherical. In addition, the object side surface of the first lens includes two inflection points, and the image side surface of the first lens includes two inflection points.

[0296] The second lens E2 has a positive refractive power and is made of plastic. The object side surface thereof is convex near the optical axis, and the image side surface thereof is concave near the optical axis. Both of the surfaces are aspherical. In addition, the object side surface of the second lens includes one inflection point.

[0297] The third lens E3 has a positive refractive power and is made of plastic. The object side surface thereof is convex near the optical axis, and the image side surface thereof is convex near the optical axis. Both of the surfaces are aspherical. In addition, the object side surface of the third lens includes one inflection point.

[0298] The fourth lens E4 has a negative refractive power and is made of plastic. The object side surface thereof is convex near the optical axis, and the image side surface thereof is concave near the optical axis. Both of the surfaces are aspherical. In addition, the object side surface of the fourth lens includes one inflection point, and the image side surface of the fourth lens includes two inflection points.

[0299] The fifth lens E5 has a positive refractive power and is made of plastic. The object side surface thereof is convex near the optical axis, and the image side surface thereof is convex near the optical axis. Both of the surfaces are aspherical. In addition, the object side surface of the fifth lens includes one inflection point and one critical point away from the optical axis, and the image side surface of the fifth lens includes two inflection points.

[0300] The sixth lens E6 has a negative refractive power and is made of plastic. The object side surface thereof is convex near the optical axis, and the image side surface thereof is concave near the optical axis. Both of the surfaces are aspherical. In addition, the object side surface of the sixth lens includes two inflection points, and the image side surface of the sixth lens includes three inflection points.

[0301] The filter element E7 is made of glass and is disposed between the sixth lens E6 and the imaging surface IMG without affecting the focal length of the imaging optical system lens group.

[0302] In addition, the following Table 15 and Table 16 are also referred to.

[0303]

[0304]

[0305]

[0306]

[0307] In the eighth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions of the parameters in the table below are the same as in the first embodiment, and will not be repeated here.

[0308] By referring to Tables 15 and 16, the following data can be calculated:

[0309]

[0310] <Ninth Embodiment>

[0311] Please refer to Figure 17 as well as Figure 18 ,in Figure 17 A schematic diagram of an image-capturing device 9 according to the ninth embodiment of this disclosure is shown. Figure 18 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the ninth embodiment. Figure 17 As can be seen, the imaging device 9 of the ninth embodiment includes an imaging optical system lens group (not otherwise labeled) and an electronic photosensitive element IS. The imaging optical system lens group includes, in sequence from the object side to the image side of the optical path, a first lens E1, an aperture stop S1, a second lens E2, an aperture ST, a third lens E3, an aperture stop S2, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter element E7, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG of the imaging optical system lens group. The imaging optical system lens group includes six lenses (E1, E2, E3, E4, E5, E6), and there are no other interposed lenses between the six lenses.

[0312] The first lens E1 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis, both of which are aspherical. In addition, the object-side surface of the first lens contains two inflection points, and the image-side surface of the first lens contains two inflection points.

[0313] The second lens E2 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis. Both are aspherical.

[0314] The third lens E3 has positive refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is also convex near the optical axis; both are aspherical. In addition, the object-side surface of the third lens contains a point of inflection.

[0315] The fourth lens E4 has negative refractive power and is made of plastic material. The object-side surface of the fourth lens is convex near the optical axis, and the image-side surface of the fourth lens is concave near the optical axis, and both surfaces are aspherical. In addition, the object-side surface of the fourth lens includes one inflection point, and the image-side surface of the fourth lens includes two inflection points.

[0316] The fifth lens E5 has positive refractive power and is made of plastic material. The object-side surface of the fifth lens is convex near the optical axis, and the image-side surface of the fifth lens is convex near the optical axis, and both surfaces are aspherical. In addition, the object-side surface of the fifth lens includes one inflection point and includes one critical point away from the optical axis, and the image-side surface of the fifth lens includes two inflection points.

[0317] The sixth lens E6 has positive refractive power and is made of plastic material. The object-side surface of the sixth lens is convex near the optical axis, and the image-side surface of the sixth lens is concave near the optical axis, and both surfaces are aspherical. In addition, the object-side surface of the sixth lens includes two inflection points, and the image-side surface of the sixth lens includes three inflection points.

[0318] The filter element E7 is made of glass material, which is disposed between the sixth lens E6 and the imaging surface IMG and does not affect the focal length of the imaging optical system lens group.

[0319] In combination with Table 17 and Table 18 below.

[0320]

[0321]

[0322]

[0323]

[0324] In the ninth embodiment, the curve equation of the aspherical surface is in the form of the first embodiment. In addition, the definitions of the parameters in the following tables are the same as those in the first embodiment, which are not described herein.

[0325] In combination with Table 17 and Table 18, the following data can be calculated:

[0326]

[0327] <TENTH EMBODIMENT>

[0328] Please refer to Figure 19 and Figure 20 wherein Figure 19 a schematic diagram of an image capturing device 10 according to the tenth embodiment of the present disclosure is shown, Figure 20 the spherical aberration, the astigmatism, and the distortion curves of the tenth embodiment are sequentially shown from left to right. From Figure 19As shown in FIG. 10, the image pickup device 10 of the tenth embodiment includes an imaging optical system lens group (not labeled separately) and an electronic photosensitive element IS. The imaging optical system lens group includes, in order from the object side to the image side of the optical path, a first lens E1, a stop S1, a second lens E2, an aperture ST, a third lens E3, a stop S2, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter element E7, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG of the imaging optical system lens group. The imaging optical system lens group includes six lenses (E1, E2, E3, E4, E5, E6) without any other intervening lenses therebetween.

[0329] The first lens E1 has a negative refractive power and is made of plastic. The object side surface thereof is concave near the optical axis, and the image side surface thereof is convex near the optical axis. Both surfaces are aspherical. In addition, the object side surface of the first lens includes one inflection point, and the image side surface of the first lens includes three inflection points.

[0330] The second lens E2 has a negative refractive power and is made of glass. The object side surface thereof is convex near the optical axis, and the image side surface thereof is concave near the optical axis. Both surfaces are aspherical. In addition, the object side surface of the second lens includes one inflection point.

[0331] The third lens E3 has a positive refractive power and is made of plastic. The object side surface thereof is convex near the optical axis, and the image side surface thereof is convex near the optical axis. Both surfaces are aspherical. In addition, the object side surface of the third lens includes one inflection point, and the image side surface of the third lens includes one inflection point.

[0332] The fourth lens E4 has a positive refractive power and is made of plastic. The object side surface thereof is concave near the optical axis, and the image side surface thereof is convex near the optical axis. Both surfaces are aspherical. In addition, the object side surface of the fourth lens includes one inflection point, and the image side surface of the fourth lens includes three inflection points.

[0333] The fifth lens E5 has a positive refractive power and is made of plastic. The object side surface thereof is concave near the optical axis, and the image side surface thereof is convex near the optical axis. Both surfaces are aspherical. In addition, the object side surface of the fifth lens includes four inflection points and includes two critical points away from the optical axis, and the image side surface of the fifth lens includes two inflection points.

[0334] The sixth lens E6 has a negative refractive power and is made of plastic. The object side surface thereof is convex near the optical axis, and the image side surface thereof is concave near the optical axis. Both surfaces are aspherical. In addition, the object side surface of the sixth lens includes three inflection points, and the image side surface of the sixth lens includes three inflection points.

[0335] The filter element E7 is made of glass and is disposed between the sixth lens E6 and the imaging surface IMG without affecting the focal length of the imaging optical system lens group.

[0336] In addition, the following Table Nineteen and Table Twenty are also referred to.

[0337]

[0338]

[0339]

[0340]

[0341] In the tenth embodiment, the equation for the aspherical curve is expressed as in the first embodiment. Furthermore, the definitions of the parameters in the table below are the same as in the first embodiment, and will not be repeated here.

[0342] By referring to Tables 19 and 20, the following data can be calculated:

[0343]

[0344] <Eleventh Embodiment>

[0345] Please refer to Figure 21 as well as Figure 22 ,in Figure 21 A schematic diagram of an image-capturing device 11 according to the eleventh embodiment of this disclosure is shown. Figure 22 From left to right, the graphs show the spherical aberration, astigmatism, and distortion curves of the eleventh embodiment. Figure 21 As can be seen, the imaging device 11 of the eleventh embodiment includes an imaging optical system lens group (not otherwise labeled) and an electronic photosensitive element IS. The imaging optical system lens group includes, in sequence from the object side to the image side of the optical path, a first lens E1, an aperture stop S1, a second lens E2, an aperture ST, a third lens E3, an aperture stop S2, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter element E7, and an imaging surface IMG. The electronic photosensitive element IS is disposed on the imaging surface IMG of the imaging optical system lens group. The imaging optical system lens group includes six lenses (E1, E2, E3, E4, E5, E6), and there are no other interposed lenses between the six lenses.

[0346] The first lens E1 has negative refractive power and is made of plastic. Its object-side surface is concave near the optical axis, and its image-side surface is convex near the optical axis, both of which are aspherical. In addition, the object-side surface of the first lens contains two inflection points, and the image-side surface of the first lens contains two inflection points.

[0347] The second lens E2 has negative refractive power and is made of plastic. Its object-side surface is convex near the optical axis, and its image-side surface is concave near the optical axis, both of which are aspherical. In addition, the object-side surface of the second lens contains a point of inflection.

[0348] The third lens E3 has positive refractive power and is made of plastic material. The object-side surface of the third lens E3 is convex near the optical axis, and the image-side surface of the third lens E3 is convex near the optical axis, and both surfaces are aspherical. In addition, the image-side surface of the third lens E3 includes one inflection point.

[0349] The fourth lens E4 has negative refractive power and is made of glass material. The object-side surface of the fourth lens E4 is concave near the optical axis, and the image-side surface of the fourth lens E4 is convex near the optical axis, and both surfaces are aspherical. In addition, the object-side surface of the fourth lens E4 includes one inflection point, and the image-side surface of the fourth lens E4 includes three inflection points.

[0350] The fifth lens E5 has positive refractive power and is made of plastic material. The object-side surface of the fifth lens E5 is concave near the optical axis, and the image-side surface of the fifth lens E5 is convex near the optical axis, and both surfaces are aspherical. In addition, the object-side surface of the fifth lens E5 includes two inflection points and includes two critical points off the optical axis, and the image-side surface of the fifth lens E5 includes two inflection points.

[0351] The sixth lens E6 has negative refractive power and is made of plastic material. The object-side surface of the sixth lens E6 is convex near the optical axis, and the image-side surface of the sixth lens E6 is concave near the optical axis, and both surfaces are aspherical. In addition, the object-side surface of the sixth lens E6 includes three inflection points, and the image-side surface of the sixth lens E6 includes three inflection points.

[0352] The filter element E7 is made of glass material, and is disposed between the sixth lens E6 and the imaging surface IMG and does not affect the focal length of the imaging optical system lens group.

[0353] In addition, the following Table 21 and Table 22 are provided for reference.

[0354]

[0355]

[0356]

[0357]

[0358] In the eleventh embodiment, the curve equation of the aspherical surface is in the form of the first embodiment. In addition, the definitions of the parameters in the following tables are the same as those in the first embodiment, and are not described herein.

[0359] The following data can be calculated according to Table 21 and Table 22:

[0360]

[0361] Twelfth Embodiment

[0362] Please refer to Figure 24 which shows a perspective view of an image capturing device 100 according to the twelfth embodiment of the present disclosure. As shown in Figure 24As can be seen, the image capturing device 100 of the twelfth embodiment is a camera module. The image capturing device 100 includes an imaging lens 101, a driving device assembly 102, and an electronic image sensor 103. The imaging lens 101 includes the imaging optical system lens assembly of this disclosure and a lens barrel (not otherwise labeled) that carries the imaging optical system lens assembly. The image capturing device 100 uses the imaging lens 101 to focus light and capture an image of the subject, and works with the driving device assembly 102 to focus the image. Finally, the image is captured on the electronic image sensor 103, and the image data is output.

[0363] The drive unit assembly 102 can be an autofocus module, and its drive method can be a voice coil motor, microelectromechanical system, piezoelectric system, or shape memory metal drive system. The drive unit assembly 102 enables the imaging optical system lens group to achieve a better imaging position, and can provide clear images of the subject at different object distances.

[0364] The image capturing device 100 may be equipped with a high-sensitivity and low-noise electronic image sensor 103 (such as CMOS or CCD) located on the imaging surface of the imaging optical system lens assembly, which can truly present the good imaging quality of the imaging optical system lens assembly. In addition, the image capturing device 100 may also include an image stabilization module 104, which may be a kinetic energy sensing element such as an accelerometer, gyroscope, or Hall effect sensor. In the twelfth embodiment, the image stabilization module 104 is a gyroscope, but it is not limited thereto. By adjusting the changes in different axes of the imaging optical system lens assembly to compensate for the blurred image caused by shaking at the moment of shooting, the imaging quality of shooting in dynamic and low-light scenes is further improved, and advanced image compensation functions such as optical image stabilization (OIS) and electronic image stabilization (EIS) are provided.

[0365] <Thirteenth Embodiment>

[0366] Please refer to Figure 25A , Figure 25B and Figure 25C ,in Figure 25A A schematic diagram showing one side of an electronic device 200 according to the thirteenth embodiment of this disclosure is provided. Figure 25B Drawing according to Figure 25A A schematic diagram of the other side of the electronic device 200. Figure 25C Drawing according to Figure 25A A system schematic diagram of the electronic device 200. (By...) Figure 25A , Figure 25B and Figure 25CIt is known that the electronic device 200 of the thirteenth embodiment is a smart phone, and the electronic device 200 comprises the image capturing devices 100, 110, 120, 130, 140, the flash module 201, the focus assisting module 202, the image signal processor 203 (ISP), the user interface 204, and the image software processor 205, wherein the image capturing devices 120, 130, 140 are front cameras. When the user captures the object 206 through the user interface 204, the electronic device 200 uses the image capturing devices 100, 110, 120, 130, 140 to focus and capture the image, starts the flash module 201 to provide light supplement, uses the object distance information provided by the focus assisting module 202 to achieve fast focusing, and uses the image signal processor 203 and the image software processor 205 to perform image optimization processing, so as to further improve the image quality generated by the image lens. The focus assisting module 202 can use an infrared or laser focus assisting system to achieve fast focusing, and the user interface 204 can use a touch screen or a physical shooting button to cooperate with the diversified functions of the image processing software to perform image capturing and image processing.

[0367] At least one of the image capturing devices 100, 110, 120, 130, 140 in the thirteenth embodiment can comprise the imaging optical system lens group of the present disclosure, and can have the same or similar structure as the image capturing device 100 in the aforementioned twelfth embodiment, which will not be described again. In detail, the image capturing devices 100, 110 in the thirteenth embodiment can be wide-angle image capturing devices and ultra-wide-angle image capturing devices, respectively, or can be wide-angle image capturing devices and telephoto image capturing devices, respectively, and the image capturing devices 120, 130, 140 can be wide-angle image capturing devices, ultra-wide-angle image capturing devices, and TOF modules (Time-Of-Flight), respectively, but are not limited to this configuration. In addition, the connection relationship of the image capturing devices 110, 120, 130, 140 and other components can be the same as the image capturing device 100 shown in the thirteenth embodiment, or can be adaptively adjusted according to the type of the image capturing device, which will not be described again. Figure 25C In detail, the image capturing devices 100, 110, 120, 130, 140 in the thirteenth embodiment can be wide-angle image capturing devices, ultra-wide-angle image capturing devices, and TOF modules (Time-Of-Flight), respectively, but are not limited to this configuration. In addition, the connection relationship of the image capturing devices 110, 120, 130, 140 and other components can be the same as the image capturing device 100 shown in the thirteenth embodiment, or can be adaptively adjusted according to the type of the image capturing device, which will not be described again.

[0368] <Fourteenth Embodiment>

[0369] Please refer to Figure 26 , which shows a schematic view of one side of an electronic device 300 according to the fourteenth embodiment of the present disclosure. The electronic device 300 of the fourteenth embodiment is a smart phone, and the electronic device 300 comprises image capturing devices 310, 320, 330 and a flash module 301.

[0370] The electronic device 300 of the fourteenth embodiment can include the same or similar elements as those of the thirteenth embodiment described above, and the connection relationship of the image capturing devices 310, 320, 330 and other elements can also be the same as or similar to that disclosed in the thirteenth embodiment, which will not be described again here. The image capturing devices 310, 320, 330 in the fourteenth embodiment can each include an imaging optical system lens group according to the present disclosure, and can each have the same or similar structure as the image capturing device 100 in the twelfth embodiment described above, which will not be described again here. In detail, the image capturing device 310 can be an ultra-wide-angle image capturing device, the image capturing device 320 can be a wide-angle image capturing device, the image capturing device 330 can be a telephoto image capturing device (which can include a light path turning element), or can be another kind of image capturing device, without being limited to this configuration.

[0371] <The fifteenth embodiment>

[0372] Please refer to Figure 27 , which shows a schematic diagram of one side of an electronic device 400 according to the fifteenth embodiment of the present disclosure. The electronic device 400 of the fifteenth embodiment is a smartphone, which includes image capturing devices 410, 420, 430, 440, 450, 460, 470, 480, 490 and a flash module 401.

[0373] The electronic device 400 of the fifteenth embodiment can include the same or similar elements as those of the thirteenth embodiment described above, and the connection relationship of the image capturing devices 410, 420, 430, 440, 450, 460, 470, 480, 490 and the flash module 401 and other elements can also be the same as or similar to that disclosed in the thirteenth embodiment, which will not be described again here. The image capturing devices 410, 420, 430, 440, 450, 460, 470, 480, 490 in the fifteenth embodiment can each include an imaging optical system lens group according to the present disclosure, and can each have the same or similar structure as the image capturing device 100 in the twelfth embodiment described above, which will not be described again here.

[0374] In detail, the image capturing devices 410, 420 can each be an ultra-wide-angle image capturing device, the image capturing devices 430, 440 can each be a wide-angle image capturing device, the image capturing devices 450, 460 can each be a telephoto image capturing device, the image capturing devices 470, 480 can each be a telephoto image capturing device (which can include a light path turning element), the image capturing device 490 can be a TOF module, or can be another kind of image capturing device, without being limited to this configuration.

[0375] <The sixteenth embodiment>

[0376] Please refer to Figure 28A and Figure 28B , in which Figure 28AFIG. 16 shows a schematic view of one side of an electronic device 500 according to a sixteenth embodiment of the present disclosure, Figure 28B FIG. 17 shows a schematic view of the other side of the electronic device 500 according to the sixteenth embodiment of the present disclosure. Figure 28A Figure 28A Figure 28B As can be seen, the electronic device 500 of the sixteenth embodiment is a smartphone, and the electronic device 500 includes image capturing devices 510, 520, 530, 540 and a user interface 504.

[0377] The electronic device 500 of the sixteenth embodiment can include the same or similar elements as those of the thirteenth embodiment described above, and the connection relationship between the image capturing devices 510, 520, 530, 540 and the user interface 504 and other elements can also be the same or similar to those disclosed in the thirteenth embodiment, and thus will not be described again. In detail, the image capturing device 510 can correspond to a non-circular opening on the outer side of the electronic device, and the image capturing devices 520, 530, 540 can be a telephoto image capturing device, a wide-angle image capturing device and an ultra-wide-angle image capturing device, respectively, or can be other types of image capturing devices, and are not limited to this configuration.

[0378] Although the present disclosure has been described with reference to the embodiments above, it is not used to limit the present disclosure, and any person skilled in the art can make various modifications and decorations without departing from the spirit and scope of the present disclosure, and thus the protection scope of the present disclosure should be subject to the scope defined by the appended claims.​​

Claims

1. An imaging optical system lens set, characterized by, comprises six lenses in order from an object side to an image side of an optical path: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens; each of the lenses has an object side surface facing the object side and an image side surface facing the image side; wherein the total number of lenses in the imaging optical system lens is six, the first lens has negative refractive power, the first lens object side surface is concave near the optical axis, the first lens image side surface is convex near the optical axis; the second lens has positive refractive power, the second lens object side surface is convex near the optical axis, the second lens image side surface is concave near the optical axis; the third lens has positive refractive power; the fifth lens has positive refractive power; wherein a thickness of the third lens on the optical axis is CT3, a thickness of the fourth lens on the optical axis is CT4, a thickness of the fifth lens on the optical axis is CT5, a focal length of the imaging optical system lens is f, a focal length of the fourth lens is f4, a focal length of the sixth lens is f6, an Abbe number of the second lens is V2, an Abbe number of the fourth lens is V4, which satisfy the following conditions: 5.30 < (CT3 + CT5) / CT4 < 15.0; -2.10 < f / f4 < 1.00; -0.35 < f / f6 < 0.90; and 12 < (V2 + V4) / 2 < 24.

2. The imaging optical system of claim 1, wherein a focal length of the imaging optical system lens is f, a separation distance of the first lens and the second lens on the optical axis is T12, a separation distance of the second lens and the third lens on the optical axis is T23, which satisfy the following conditions: 1.70 < f / (T12 + T23) < 3.

80.

3. The imaging optical system of claim 1, wherein a focal length of the third lens is f3, a focal length of the fifth lens is f5, which satisfy the following conditions: -0.50 < f3 / f5 < 2.

80.

4. The imaging optical system of claim 1, wherein a focal length of the imaging optical system lens is f, a thickness of the third lens on the optical axis is CT3, a thickness of the fifth lens on the optical axis is CT5, which satisfy the following conditions: 0.90 < f / (CT3 + CT5) < 1.

27.

5. The imaging optical system of claim 1, wherein a radius of curvature of the sixth lens object side surface is R11, a radius of curvature of the sixth lens image side surface is R12, which satisfy the following conditions: 5.00 < (R11 + R12) / (R11 - R12) < 20.

0.

6. The imaging optical system of claim 1, wherein a radius of curvature of the third lens object side surface is R5, a radius of curvature of the third lens image side surface is R6, a focal length of the imaging optical system lens is f, a separation distance of the fourth lens and the fifth lens on the optical axis is T45, which satisfy the following conditions: -1.70 < (R5 + R6) / (R5 - R6) < 0.40; and 18.0 < f / T45 < 65.

0.

7. The imaging optical system of claim 1, wherein an Abbe number of the second lens is V2, an Abbe number of the fourth lens is V4, which satisfy the following conditions: 12 < (V2 + V4) / 2 ≤ 23.

35.

8. An image pickup device, comprising: comprises: the imaging optical system lens of claim 1; and an electronic photosensitive element disposed on an image plane of the imaging optical system lens.

9. An electronic device, comprising: comprises: the image capturing device of claim 8.

10. An imaging optical system lens set, characterized by, comprises six lenses in order from an object side to an image side of an optical path: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens; each of the lenses has an object side surface facing the object side and an image side surface facing the image side; wherein the total number of lenses in the imaging optical system lens set is six, the first lens has negative refractive power, the first lens object side surface is concave near the optical axis, the first lens image side surface is convex near the optical axis; the second lens image side surface is concave near the optical axis; the third lens has positive refractive power; the fifth lens has positive refractive power; at least one surface of at least one of the six lenses comprises at least one inflection point; wherein a curvature radius of the second lens image side surface is R4, a curvature radius of the sixth lens image side surface is R12, a focal length of the imaging optical system lens set is f, a focal length of the sixth lens is f6, a separation distance on the optical axis between the third lens and the fourth lens is T34, a separation distance on the optical axis between the fourth lens and the fifth lens is T45, a separation distance on the optical axis between the fifth lens and the sixth lens is T56, which satisfy the following conditions: 1.60 < (R4 + R12) / (R4 - R12) < 3.30; 4.22 < f / (T34 + T45 + T56) < 15.0; and -0.63 < f / f6 < 1.

20.

11. The imaging optical system of claim 10, wherein a focal length of the imaging optical system lens set is f, a focal length of the fifth lens is f5, a curvature radius of the fifth lens image side surface is R10, a curvature radius of the sixth lens image side surface is R12, which satisfy the following conditions: 0.18 < f / f5 < 1.00; and R10 / R12 < -1.

60.

12. The imaging optical system of claim 10, wherein a focal length of the imaging optical system lens set is f, a composite focal length of the second lens and the third lens is f23, which satisfy the following conditions: -0.20 < f / f23 < 1.

50.

13. The imaging optical system of claim 10, wherein, a curvature radius of the third lens object side surface is R5, a curvature radius of the third lens image side surface is R6, a focal length of the imaging optical system lens set is f, a separation distance on the optical axis between the fourth lens and the fifth lens is T45, which satisfy the following conditions: -5.00 < (R5 + R6) / (R5 - R6) < 1.50; and 20.0 < f / T45 < 60.

0.

14. The imaging optical system of claim 10, wherein, further comprising: an aperture, wherein a distance on the optical axis between the aperture and an image plane is SL, a focal length of the imaging optical system lens set is f, which satisfy the following conditions: 2.05 < SL / f < 2.

75.

15. The imaging optical system of claim 10, wherein, at least one of the object side surface and the image side surface of the fifth lens comprises at least one critical point near the periphery; a curvature radius of the second lens object side surface is R3, a separation distance on the optical axis between the first lens and the second lens is T12, which satisfy the following conditions: 2.50 < R3 / T12 < 17.

0.

16. The imaging optical system of claim 10, wherein A radius of curvature of the object-side surface of the sixth lens is R11, a radius of curvature of the image-side surface of the sixth lens is R12, a focal length of the imaging optical system lens is f, a separation distance on the optical axis between the first lens and the second lens is T12, a separation distance on the optical axis between the second lens and the third lens is T23, and the following conditions are satisfied: 5.50 < (R11+R12) / (R11-R12) < 19.0; and 1.80 < f / (T12+T23) < 3.

75.

17. The imaging optical system of claim 10, wherein A refractive index of the second lens is N2, and a refractive index of the fourth lens is N4, and the following condition is satisfied: 1.62 < (N2+N4) / 2 < 1.

79.

18. An imaging optical system lens set, characterized by, The sixth lens includes six lenses arranged in order from an object side to an image side of an optical path as follows: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens; each of the lenses has an object-side surface facing the object side and an image-side surface facing the image side; wherein the total number of lenses in the imaging optical system lens is six, the first lens has negative refractive power, the object-side surface of the first lens is concave near the optical axis, the image-side surface of the first lens is convex near the optical axis, the third lens has positive refractive power, the fifth lens has positive refractive power, the image-side surface of the sixth lens is concave near the optical axis, and at least one surface of at least one of the six lenses includes at least one inflection point; wherein a radius of curvature of the image-side surface of the second lens is R4, a radius of curvature of the image-side surface of the fifth lens is R10, a radius of curvature of the image-side surface of the sixth lens is R12, a focal length of the imaging optical system lens is f, a focal length of the fourth lens is f4, and a focal length of the sixth lens is f6, and the following conditions are satisfied: (R4+R12) / (R4-R12) < 2.32; -0.65 < f / f4 < 0.80; -0.37 < f / f6 < 1.00; and -4.00 < R10 / R12 < -1.

55.

19. The imaging optical system of claim 18, wherein, A separation distance on the optical axis between the fourth lens and the fifth lens is T45, and a thickness of the fourth lens on the optical axis is CT4, and the following condition is satisfied: 0.05 < T45 / CT4 < 0.

35.

20. The imaging optical system of claim 18, wherein A radius of curvature of the object-side surface of the third lens is R5, and a radius of curvature of the image-side surface of the third lens is R6, and the following condition is satisfied: -1.68 < (R5+R6) / (R5-R6) < 0.

38.

21. The imaging optical system of claim 18, wherein, A focal length of the imaging optical system lens is f, a focal length of the fourth lens is f4, and a separation distance on the optical axis between the fourth lens and the fifth lens is T45, and the following conditions are satisfied: -0.38 < f / f4 < 0.80; and 20.0 < f / T45 < 60.

0.

22. The imaging optical system of claim 18, wherein A focal length of the imaging optical system lens is f, a thickness of the third lens on the optical axis is CT3, a thickness of the fifth lens on the optical axis is CT5, and a separation distance on the optical axis between the fourth lens and the fifth lens is T45, and the following conditions are satisfied: 0.50 < f / (CT3+CT5) < 1.65; and 20.0 < f / T45 < 70.

0.

23. The imaging optical system of claim 18, wherein An Abbe number of the second lens is V2, and an Abbe number of the fourth lens is V4, which satisfy the following condition: 12 < (V2+V4) / 2 < 24.

24. The imaging optical system of claim 18, wherein An image-side surface of the second lens is concave near the optical axis; an aperture value of the imaging optical system lens is Fno, and half of a maximum viewing angle in the imaging optical system lens is HFOV, which satisfy the following conditions: 1.95 < Fno < 2.20; and 58 degrees < HFOV.

25. The imaging optical system of claim 18, wherein A radius of curvature of an object-side surface of the sixth lens is R11, and a radius of curvature of an image-side surface of the sixth lens is R12, which satisfy the following condition: 4.90 < (R11+R12) / (R11-R12) < 17.

0.

26. An imaging optical system lens set, characterized by, The six lenses are sequentially arranged from an object side to an image side of an optical path as follows: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens; each of the lenses has an object-side surface facing the object side and an image-side surface facing the image side; wherein a total number of the lenses in the imaging optical system lens is six, the first lens has negative refractive power, the third lens has positive refractive power, the fifth lens has positive refractive power, at least one surface of at least one of the six lenses includes at least one inflection point; wherein the imaging optical system lens further includes an aperture, a distance from the aperture to an image plane on the optical axis is SL, a focal length of the imaging optical system lens is f, a focal length of the sixth lens is f6, a combined focal length of the second lens and the third lens is f23, a separation distance on the optical axis between the first lens and the second lens is T12, a separation distance on the optical axis between the second lens and the third lens is T23, a separation distance on the optical axis between the third lens and the fourth lens is T34, a separation distance on the optical axis between the fourth lens and the fifth lens is T45, a separation distance on the optical axis between the fifth lens and the sixth lens is T56, a thickness of the third lens on the optical axis is CT3, a thickness of the fourth lens on the optical axis is CT4, and a thickness of the fifth lens on the optical axis is CT5, which satisfy the following conditions: 4.50 < (CT3+CT5) / CT4 < 8.00; 1.95 < f / (T12+T23) < 16.0; 3.70 < f / (T34+T45+T56) < 14.5; -0.10 < f / f23 < 0.92; -0.25 < f / f6 < 0.55; and 2.00 < SL / f < 2.

90.

27. The imaging optical system of claim 26, wherein A focal length of the imaging optical system lens is f, a focal length of the fourth lens is f4, and a separation distance on the optical axis between the fourth lens and the fifth lens is T45, which satisfy the following conditions: -1.00 < f / f4 < 1.30; and 20.0 < f / T45 < 60.

0.

28. The imaging optical system of claim 26, wherein An object-side surface of the first lens is concave near the optical axis; a focal length of the third lens is f3, and a focal length of the fifth lens is f5, which satisfy the following condition: 0.20 < f3 / f5 < 2.

70.

29. The imaging optical system of claim 26, wherein A focal length of the imaging optical system lens set is f, a focal length of the fourth lens is f4, a curvature radius of an image side surface of the second lens is R4, and a curvature radius of an image side surface of the sixth lens is R12, which satisfy the following conditions: -0.55 < f / f4 < 0.70; and 1.70 < (R4+R12) / (R4-R12) < 2.

30.

30. The imaging optical system of claim 26, wherein A curvature radius of an object side surface of the sixth lens is R11, and a curvature radius of an image side surface of the sixth lens is R12, which satisfy the following conditions: 7.00 < (R11+R12) / (R11-R12) < 17.

31. The imaging optical system of claim 26, wherein The object side surface of the first lens is concave near the optical axis, and the image side surface of the first lens is convex near the optical axis; a curvature radius of the image side surface of the second lens is R4, and a curvature radius of the image side surface of the sixth lens is R12, which satisfy the following conditions: 1.35 < (R4+R12) / (R4-R12) < 5.

00.

32. The imaging optical system of claim 26, wherein A refractive index of the second lens is N2, and a refractive index of the fourth lens is N4, which satisfy the following conditions: 1.62 < (N2+N4) / 2 < 1.79.

Images