Optical Imaging Lens, Camera Module, and Imaging Device

Abstract

An optical imaging lens in an optical system including six lenses according to an example of the present disclosure, successively having from the object side: a first lens having a negative refractive power, the first lens having a concave surface with an inflection point facing the object side; a fourth lens having a positive refractive power, the fourth lens having a concave surface without an inflection point facing the object side; and a fifth lens having a positive refractive power near the optical axis, the thickness of the outermost periphery of the fifth lens being greater than its thickness on the optical axis, wherein the maximum viewing angle is equal to or greater than 100 degrees. The optical imaging lens thus achieved has a small size and good optical performance. The present disclosure is applicable to a camera module and an imaging device.

Description

Technical Field

[0001] The present disclosure relates to an optical imaging lens, a camera module, and an imaging device, and more particularly, to an optical imaging lens, a camera module, and an imaging device that are small and capable of achieving good optical performance. Background Art

[0002] Conventionally, an optical system including a front group optical system having negative refractive power and a rear group optical system having positive refractive power in order from the object side has been known as an imaging optical system used in imaging devices (such as in-vehicle cameras, surveillance cameras, video cameras, and electronic still cameras).

[0003] In recent years, portable imaging devices such as mobile phones and digital cameras have been widely used. As imaging devices become increasingly miniaturized, the optical imaging lenses mounted on the imaging devices also need to be reduced in size. In addition, since the resolution of the imaging elements mounted on the imaging devices is also increasing, the resolution of the optical imaging lenses mounted on the imaging devices also needs to be further improved to adapt to the higher resolution of the imaging elements. Therefore, compact optical imaging lenses that meet such requirements have been proposed.

[0004] However, in such imaging devices, in order to avoid a decrease in the sensitivity of the imaging elements or an increase in noise as the pitch of the imaging element units becomes narrower, a brighter lens with a larger diameter is required. In addition, the demand for increasing the amount of imaging data by expanding the viewing angle when taking, for example, a snapshot, and the demand for creating a shooting space and an air atmosphere are increasing. However, it is necessary to reduce the size of the imaging device to fit a predetermined device size.

[0005] Therefore, it is necessary to further reduce the size to accommodate an ultra-wide-angle lens in a compact digital device (such as a mobile phone or an action camera).

[0006] However, a wide-angle lens with a conventional design has a long back focal length when used in a compact digital device, and its size as an optical system is not compact enough. Summary of the Invention

[0007] The present disclosure aims to solve at least one of the above technical problems. Therefore, the present disclosure provides an optical imaging lens, a camera module, and an imaging device.

[0008] According to the present disclosure, an optical imaging lens in an optical system including six front lenses sequentially includes, from the object side:

[0009] A first lens having negative refractive power, the first lens having a concave surface with an inflection point facing the object side;

[0010] A fourth lens with positive refractive power, the fourth lens having a concave surface facing the object side without an inflection point; and

[0011] A fifth lens with positive refractive power near the optical axis, the thickness of the outermost part of the fifth lens being greater than the thickness of the fifth lens on the optical axis,

[0012] wherein, the maximum viewing angle is equal to or greater than 100 degrees.

[0013] In one example, the imaging may satisfy the following conditional expression:

[0014] 0.8 < TTL / ImgCircle < 1.1,

[0015] wherein, TTL is the length from the surface on the optical axis on the object side of the first lens to the focus of the entire lens system; and

[0016] ImgCircle is the diagonal length of the effective pixel region of the imaging surface of the optical imaging lens.

[0017] In one example, the imaging may satisfy the following conditional expression:

[0018] 20 < v5–v3,

[0019] wherein, v5 is the Abbe number of the fifth lens; and

[0020] v3 is the Abbe number of the third lens.

[0021] In one example, the optical imaging lens may satisfy the following conditional expression:

[0022] 0.15 < f4 / f5 < 10.0,

[0023] wherein, f4 is the focal length of the fourth lens; and

[0024] f5 is the focal length of the fifth lens.

[0025] In one example, the optical imaging lens may include a diaphragm between the first lens and the second lens.

[0026] In one example, the lens located on the outermost surface side of the imaging may have an aspherical shape with an inflection point, and the lens is formed of plastic.

[0027] According to the present disclosure, a camera module includes an optical imaging lens and an image sensor, and the image sensor outputs an image signal according to an optical image formed by the optical imaging lens,

[0028] wherein, the optical imaging lens in an optical system including six lenses sequentially includes, starting from the object side:

[0029] A first lens having a negative refractive power, the first lens having a concave surface with an inflection point facing the object side;

[0030] A fourth lens having a positive refractive power, the fourth lens having a concave surface without an inflection point facing the object side; and

[0031] A fifth lens having a positive refractive power near the optical axis, the outermost peripheral portion of the fifth lens having a thickness greater than the thickness of the fifth lens on the optical axis,

[0032] wherein, the maximum viewing angle is equal to or greater than 100 degrees.

[0033] According to the present disclosure, an imaging device includes a camera module. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] These and / or other aspects and advantages of the embodiments of the present disclosure will become apparent and more readily understood from the following description with reference to the accompanying drawings, in which:

[0035] Figure 1 is a diagram showing a schematic configuration of a camera module according to the present disclosure;

[0036] Figure 2 is a configuration diagram of a camera module according to a first example of the present disclosure;

[0037] Figure 3A is a table showing the radius of curvature, surface distance, refractive index, and Abbe number on each side of each lens of the camera module according to the first example of the present disclosure;

[0038] Figure 3B is a table showing the focal length, F-number, viewing angle, total lens length, and sensor size of the camera module according to the first example of the present disclosure;

[0039] Figure 3C is a table showing the focal length of each lens of the camera module according to the first example of the present disclosure;

[0040] Figure 3D is a table showing the values of TTL / ImgCircle, the value of v5 - v3, and the value of f4 / f5 of the camera module according to the first example of the present disclosure;

[0041] Figure 4 is a table showing the radius of curvature, conic coefficient, and aspheric coefficient on each side of each lens of the camera module according to the first example of the present disclosure;

[0042] Figure 5 is a graph showing the longitudinal spherical aberration, astigmatic field curve, and distortion of the camera module according to the first example of the present disclosure;

[0043] Figure 6It is a configuration diagram of a camera module according to the second example of the present disclosure;

[0044] Figure 7A It is a table showing the radius of curvature, surface distance, refractive index, and Abbe number on each side of each lens of the camera module according to the second example of the present disclosure;

[0045] Figure 7B It is a table showing the focal length, F-number, viewing angle, total lens length, and sensor size of the camera module according to the second example of the present disclosure;

[0046] Figure 7C It is a table showing the focal length of each lens of the camera module according to the second example of the present disclosure;

[0047] Figure 7D It is a table showing the values of TTL / ImgCircle, v5 - v3, and f4 / f5 of the camera module according to the second example of the present disclosure;

[0048] Figure 8 It is a table showing the radius of curvature, conic coefficient, and aspheric coefficient on each side of each lens of the camera module according to the second example of the present disclosure;

[0049] Figure 9 It is a graph showing the longitudinal spherical aberration, astigmatic field curve, and distortion of the camera module according to the second example of the present disclosure;

[0050] Figure 10 It is a configuration diagram of a camera module according to the third example of the present disclosure;

[0051] Figure 11A It is a table showing the radius of curvature, surface distance, refractive index, and Abbe number on each side of each lens of the camera module according to the third example of the present disclosure;

[0052] Figure 11B It is a table showing the focal length, F-number, viewing angle, total lens length, and sensor size of the camera module according to the third example of the present disclosure;

[0053] Figure 11C It is a table showing the focal length of each lens of the camera module according to the third example of the present disclosure;

[0054] Figure 11D It is a table showing the values of TTL / ImgCircle, v3 - v5, and f4 / f5 of the camera module according to the third example of the present disclosure;

[0055] Figure 12 It is a table showing the radius of curvature, conic coefficient, and aspheric coefficient on each side of each lens of the camera module according to the third example of the present disclosure;

[0056] Figure 13is a graph showing the longitudinal spherical aberration, astigmatism field curve, and distortion of a camera module according to a third example of the present disclosure;

[0057] Figure 14 is a configuration diagram of a camera module according to a fourth example of the present disclosure;

[0058] Figure 15A is a table showing the radius of curvature, surface distance, refractive index, and Abbe number of each side of each lens of a camera module according to a fourth example of the present disclosure;

[0059] Figure 15B is a table showing the focal length, F-number, viewing angle, total lens length, and sensor size of a camera module according to a fourth example of the present disclosure;

[0060] Figure 15C is a table showing the focal length of each lens of a camera module according to a fourth example of the present disclosure;

[0061] Figure 15D is a table showing the values of TTL / ImgCircle, v5 - v3, and f4 / f5 of a camera module according to a fourth example of the present disclosure;

[0062] Figure 16 is a table showing the radius of curvature, conic coefficient, and aspheric coefficient of each side of each lens of a camera module according to a fourth example of the present disclosure;

[0063] Figure 17 is a graph showing the longitudinal spherical aberration, astigmatism field curve, and distortion of a camera module according to a fourth example of the present disclosure;

[0064] Figure 18 is a configuration diagram of a camera module according to a fifth example of the present disclosure;

[0065] Figure 19A is a table showing the radius of curvature, surface distance, refractive index, and Abbe number of each side of each lens of a camera module according to a fifth example of the present disclosure;

[0066] Figure 19B is a table showing the focal length, F-number, viewing angle, total lens length, and sensor size of a camera module according to a fifth example of the present disclosure;

[0067] Figure 19C is a table showing the focal length of each lens of a camera module according to a fifth example of the present disclosure;

[0068] Figure 19D is a table showing the values of TTL / ImgCircle, v5–v3, and f4 / f5 of a camera module according to a fifth example of the present disclosure;

[0069] Figure 20A table showing the radius of curvature, conic coefficient, and aspheric coefficient on each side of each lens of a camera module according to a fifth example of the present disclosure;

[0070] Figure 21 A graph showing the longitudinal spherical aberration, astigmatic field curve, and distortion of a camera module according to a fifth example of the present disclosure;

[0071] Figure 22 A configuration diagram of a camera module according to a sixth example of the present disclosure;

[0072] Figure 23A A table showing the radius of curvature, surface distance, refractive index, and Abbe number on each side of each lens of a camera module according to a sixth example of the present disclosure;

[0073] Figure 23B A table showing the focal length, F-number, viewing angle, total lens length, and sensor size of a camera module according to a sixth example of the present disclosure;

[0074] Figure 23C A table showing the focal length of each lens of a camera module according to a sixth example of the present disclosure;

[0075] Figure 23D A table showing the values of TTL / ImgCircle, νv5-v3, and f4 / f5 of a camera module according to a sixth example of the present disclosure;

[0076] Figure 24 A table showing the radius of curvature, conic coefficient, and aspheric coefficient on each side of each lens of a camera module according to a sixth example of the present disclosure;

[0077] Figure 25 A graph showing the longitudinal spherical aberration, astigmatic field curve, and distortion of a camera module according to a sixth example of the present disclosure;

[0078] Figure 26 A configuration diagram of a camera module according to a seventh example of the present disclosure;

[0079] Figure 27A A table showing the radius of curvature, surface distance, refractive index, and Abbe number on each side of each lens of a camera module according to a seventh example of the present disclosure;

[0080] Figure 27B A table showing the focal length, F-number, viewing angle, total lens length, and sensor size of a camera module according to a seventh example of the present disclosure;

[0081] Figure 27C A table showing the focal length of each lens of a camera module according to a seventh example of the present disclosure;

[0082] Figure 27DA table showing the values of TTL / ImgCircle, v5 - v3, and f4 / f5 of the camera module according to the seventh example of the present disclosure;

[0083] Figure 28 A table showing the radius of curvature, conic coefficient, and aspheric coefficient on each side of each lens of the camera module according to the seventh example of the present disclosure; and

[0084] Figure 29 A graph showing the longitudinal spherical aberration, astigmatic field curve, and distortion of the camera module according to the seventh example of the present disclosure. Detailed Description of the Invention

[0085] Embodiments of the present disclosure will be described in detail, and examples of the embodiments will be shown in the drawings. Identical or similar elements and elements having the same or similar functions are denoted by, for example, reference numerals throughout the specification. The embodiments described with reference to the drawings herein are explanatory and are intended to illustrate the present disclosure, but should not be construed as limiting the present disclosure.

[0086] For example, data such as lens data in the following specification are merely examples, and these data should not limit the present disclosure and may be changed, modified, substituted, and varied without departing from the scope of the present disclosure.

[0087] <Summary of the Disclosure>

[0088] First, the summary of the present disclosure will be described. For example, the present disclosure is applied to a camera module configured as Figure 1 shown. In the drawings, the dashed line represents the optical axis of the camera module.

[0089] Figure 1 The camera module 11 shown includes an optical imaging lens 21, a filter 22, and an image sensor 23.

[0090] The optical imaging lens 21 is, for example, an ultra - wide - angle lens with a degree of 100 degrees or more, and includes a front - group optical system 31, an aperture stop 32, and a rear - group optical system 33. The front - group optical system 31 is a lens group disposed closer to the object side than the aperture stop 32, and the rear - group optical system 33 is a lens group disposed closer to the imaging surface side than the aperture stop 32. The front - group optical system 31 includes a lens having a negative refractive power. In addition, the rear - group optical system 33 includes at least one lens having a negative refractive power and at least one lens having a positive refractive power.

[0091] The image sensor 23 is a solid-state image sensor such as, for example, a Complementary Metal Oxide Semiconductor (CMOS) or a Charge Coupled Device (CCD). The image sensor 23 is provided on the image formation surface (imaging surface) side of the optical imaging lens 21. The image sensor 23 receives the light incident from an object via the optical imaging lens 21 and the filter 22, converts the light into an electro-optical form, and outputs the image data obtained through the electro-optical conversion of the light to a subsequent stage.

[0092] In order to obtain a small camera module with an optical imaging lens having good optical performance, it is preferable to appropriately correct the chromatic aberration of the optical imaging lens and shorten the back focal length of the optical imaging lens, for example.

[0093] Therefore, in the camera module 11, the front group optical system 31 includes at least one lens having a negative refractive power, the rear group optical system 33 includes at least one lens having a negative refractive power and at least one lens having a positive refractive power, and the lens located on the imaging most surface side in the rear group optical system 33 has an aspherical shape having an inflection point on the surface on the imaging surface side.

[0094] Since the front group optical system 31 includes at least one lens having a negative refractive power as described above, even when the viewing angle is ultra-wide, the light can be sharply refracted, and the total optical length can be shortened.

[0095] In addition, in the camera module 11, since the rear group optical system 33 includes at least one lens having a negative refractive power and at least one lens having a positive refractive power, and the lens located on the imaging most surface side in the rear group optical system 33 has an aspherical shape having an inflection point on the surface on the imaging surface side. Therefore, it is possible to make a part of the rear group optical system 33 have a large negative refractive power to shorten the back focal length of the optical imaging lens 21. In particular, if the lens located on the imaging most surface side in the rear group optical system 33 has a negative refractive power, that is, has a negative optical power near the optical axis, then this lens is suitable for shortening the back focal length.

[0096] In addition, the lens located on the imaging most surface side in the rear group optical system 33 has an aspherical shape having an inflection point near the lens edge on the surface on the imaging surface side. Specifically, the surface on the imaging surface side of the lens located on the imaging most surface side in the rear group optical system 33 has a concave shape at the lens center (i.e., near the optical axis) and a convex shape in the peripheral part (i.e., near the outer peripheral part).

[0097] In addition, the camera module 11 allows miniaturization of the optical imaging lens 21 while maintaining good optical performance of the optical imaging lens 21 by satisfying the following formula (1):

[0098] 0.8 < TTL / ImgCircle < 1.1 (1),

[0099] wherein, the total track length (TTL) is the length from the surface on the optical axis on the object side of the first lens to the focal point of the entire lens system, and ImgCircle is the diagonal length of the effective pixel region of the imaging surface of the optical imaging lens.

[0100] In addition, the camera module 11 maintains good optical performance by satisfying the following formula (2):

[0101] 20 < v5 - v3 (2),

[0102] wherein, v5 is the Abbe number of the fifth lens, and v3 is the Abbe number of the third lens.

[0103] The larger the difference between v5 and v3, the more fully the chromatic aberration can be corrected, and an optical imaging lens with good optical performance can be obtained.

[0104] Then, in the present disclosure, the camera module 11 preferably satisfies the following formula (3):

[0105] 28 < v5 - v3 (3).

[0106] In addition, while maintaining good optical performance of the optical imaging lens 21, the camera module 11 allows miniaturization of the optical imaging lens 21 by satisfying the following formula (4):

[0107] 0.15 < F4 / f5< 10.0 (4),

[0108] wherein, f4 is the focal length of the fourth lens, and f5 is the focal length of the fifth lens.

[0109] If the value of f4 / f5 drops below the lowest limit value of the condition indicated by formula (4), the dioptric power of f5 becomes weak, the spherical aberration is overcorrected, and the on-axis performance deteriorates. On the other hand, if the value of f4 / f5 exceeds the upper limit value of the condition indicated by formula (4), the dioptric power of f5 increases, the fifth lens becomes a meniscus formed on the paraxial axis and the radius of curvature decreases, which results in the aspherical shape of the fifth lens tending to fluctuate, increasing the manufacturing difficulty.

[0110] In addition, it is preferable in the present disclosure to satisfy the following formula (5),

[0111] 0.3 < f4 / f5 < 8 (5).

[0112] In addition, with respect to molding the lens, it is preferable that the aspherical lens (specifically, an aspherical lens having an aspherical shape with an inflection point) constituting the optical imaging lens 21 is formed of a plastic material (glass material). Further, among the lenses constituting the optical imaging lens 21, lenses having a size equal to or smaller than a specific size may be lenses formed of a plastic material, and lenses larger than the specific size may be lenses formed of a glass material. This is because it is difficult to form an aspherical lens or a relatively small-sized lens using a glass material other than plastic.

[0113] If the above conditions are satisfied, an optical imaging lens 21 having a small size and sufficient optical performance can be obtained even when the viewing angle is 100 degrees or more.

[0114] In particular, while balancing the focal power between the front group optical system 31 and the rear group optical system 33, the lens located on the imaging surface side of the rear group optical system 33 has an aspherical shape having an inflection point on the surface on the imaging surface side. Thereby, the back focal length can be made shorter, and it becomes possible to obtain an optical imaging lens 21 having a small size and good optical performance.

[0115] Such a camera module 11 including the optical imaging lens 21 is applicable to compact digital devices such as mobile phones, wearable cameras, and surveillance cameras.

[0116] <Configuration Example of Camera Module>

[0117] Next, more specific examples to which the present disclosure is applied will be described.

[0118] In the following examples, the symbol "Li" represents the serial number of the i-th surface sequentially increasing from the object side toward the imaging surface side. For example, "L1" represents the first lens, "L1R1" represents the surface on the object side of the first lens, and "L1R2" represents the surface on the imaging surface side of the first lens.

[0119] "R" represents the central radius of curvature value (mm). Regarding "R", "E+i" represents an exponential expression with base 10, that is, "10 i ". For example, "1.00E+18" represents "1.00×10 18 ". Such an exponential expression also applies to the aspherical coefficients described below.

[0120] "D" represents the distance value (mm) on the optical axis between the i-th surface and the (i + 1)-th surface.

[0121] "Nd" represents the refractive index value of the material of the optical element having the i-th surface at the d-line (wavelength 587.6 nm).

[0122] "vd" represents the Abbe number of the material of the optical element having the i-th surface at the d-line.

[0123] "Fno" represents the F-number.

[0124] In addition, each value of "L1" to "L6" represents the focal length, "-" represents a negative optical power, and a value without "-" represents a positive optical power.

[0125] The optical imaging lens 21 used in the following examples includes a lens having an aspherical surface. The aspherical shape of the lens is defined by the following formula (6):

[0126] Z = C·h2 / {1 + [1 - (1 + K)·C2·h2]1 / 2} + ∑An·hn (6),

[0127] where n is an integer equal to or greater than 3.

[0128] In formula (6), Z is the depth of the aspherical surface. C is the paraxial curvature equal to 1 / R, h is the distance from the optical axis to the lens surface, K is the conic coefficient (second-order aspherical coefficient), and An is the n-th order aspherical coefficient.

[0129] [First Example]

[0130] A first example of applying specific numerical values to Figure 1 the shown camera module 11 will be described.

[0131] In the first example, the front group optical system 31 includes a first lens L1 as Figure 2 shown, having a negative refractive power, and the first lens has concave surfaces facing the object side and the imaging surface side.

[0132] The rear group optical system 33 includes: a second lens L2 having a positive refractive power, which has convex surfaces facing the object side and the imaging surface side; a third lens L3 having a negative refractive power, which has a convex surface facing the object side and a concave surface facing the imaging surface side; a fourth lens L4 having a positive refractive power, which has a concave surface facing the object side and a convex surface facing the imaging surface side; a fifth lens L5 having a positive refractive power, which has a convex surface facing the object side and a concave surface facing the imaging surface side; and a sixth lens L6 having a negative refractive power, which has a convex surface facing the object side and a concave surface facing the imaging surface side.

[0133] The aperture stop 32 located in the rear group optical system 33 is disposed on the imaging surface side with respect to the vertex of the first surface of the second lens L2 and on the object side with respect to the second surface of the second lens L2.

[0134] Figure 3AShows lens data as a first example: radius of curvature R, surface distance D, refractive index Nd, and Abbe number vd.

[0135] Figure 3B Shows the focal length f, F-number Fno, viewing angle, total lens length, and sensor size of the entire system, Figure 3C Shows the focal length values of the first lens L1 to the sixth lens L6.

[0136] Figure 3D Shows the value of TTL / ImgCircle that satisfies the relationship 0.8 < TTL / ImgCircle < 1.1, the value of v5 - v3 that satisfies the relationship 20 < v5 - v3, and the value of f4 / f5 that satisfies the relationship 0.15 < f4 / f5 < 10.0.

[0137] In addition, Figure 4 Shows the radius of curvature of each of the first lens L1 to the sixth lens L6, the conic coefficient of each side of each lens, and the first aspheric coefficient to the twenty-second aspheric coefficient.

[0138] Figure 5 Shows each aberration of the above first example. Figure 5 Shows longitudinal spherical aberration, astigmatism (field curvature), and distortion as examples of aberrations. Each of these aberration diagrams shows the aberration with the d-line (587.56 nm) as the reference wavelength. In the spherical aberration diagram, the aberration with respect to the g-line (435.84 nm) and the C-line (656.27 nm) is also shown. In the diagram showing astigmatism, "S" represents the aberration value on the sagittal image surface, and "T" represents the aberration value on the tangential image surface. This also applies to the aberration diagrams in other examples.

[0139] It can be seen from the above aberration diagrams that obviously, although the camera module 11 of the first example is small in size and has an ultra-wide angle, it can satisfactorily correct various aberrations to obtain excellent optical performance.

[0140] [Second Example]

[0141] A second example of applying specific numerical values to Figure 1 the shown camera module 11 will be described. Similar to the first example, in the second example, the front group optical system 31 includes the first lens L1 as Figure 6 shown, and the rear group optical system 33 includes the second lens L2 to the sixth lens L6 as Figure 6 shown.

[0142] The aperture stop 32 located in the rear group optical system 33 is disposed on the imaging surface side with respect to the vertex of the first surface of the second lens L2 and on the object side with respect to the second surface of the second lens L2.

[0143] Figure 7A Shows lens data as a second example: radius of curvature R, surface distance D, refractive index Nd, and Abbe number vd.

[0144] Figure 7B Shows the focal length f, F-number Fno, viewing angle, total lens length, and sensor size value of the entire system, Figure 7C Shows the focal length values of the first lens L1 to the sixth lens L6.

[0145] Figure 7D Shows the value of TTL / ImgCircle that satisfies the relationship of 0.8 < TTL / ImgCircle < 1.1, the value of v5 - v3 that satisfies the relationship of 20 < v5 - v3, and the value of f4 / f5 that satisfies the relationship of 0.15 < f4 / f5 < 10.0.

[0146] Figure 8 Shows the radius of curvature of each of the first lens L1 to the sixth lens L6, the conic coefficient on each side of each lens, and the first aspherical coefficient to the twenty-second aspherical coefficient.

[0147] Figure 9 Shows each aberration of the second example above. It can be seen from the above aberration diagrams that, obviously, although the camera module 11 of the second example is small in size and has an ultra-wide angle, it can satisfactorily correct various aberrations to obtain excellent optical performance.

[0148] [Third Example]

[0149] A third example of applying specific numerical values to the Figure 1 shown camera module 11 will be described. Similar to the first example and the second example, in the third example, the front group optical system 31 includes the first lens L1 as Figure 10 shown, and the rear group optical system 33 includes the second lens L2 to the sixth lens L6 as Figure 10 shown.

[0150] The aperture stop 32 in the rear group optical system 33 is disposed on the image forming surface side with respect to the vertex of the first surface of the second lens L2 and on the object side with respect to the second surface of the third lens L2.

[0151] Figure 11A Shows lens data as a third example: radius of curvature R, surface distance D, refractive index Nd, and Abbe number vd.

[0152] Figure 11B Shows the focal length f, F-number Fno, viewing angle, total lens length, and sensor size value of the entire system, Figure 11C Shows the focal length values of the first lens L1 to the sixth lens L6.

[0153] Figure 11D Shows the values of TTL / ImgCircle that satisfy the relationship 0.8 < TTL / ImgCircle < 1.1, the values of v5 - v3 that satisfy the relationship 20 < v5 - v3, and the values of f4 / f5 that satisfy the relationship 0.15 < f4 / f5 < 10.0.

[0154] Figure 12 Shows the radius of curvature of each of the first lens L1 to the sixth lens L6, the conic coefficient of each side of each lens, and the first aspherical coefficient to the twenty - second aspherical coefficient.

[0155] Figure 13 Shows each aberration of the third example above. It can be seen from the above aberration diagrams that, obviously, although the camera module 11 of the third example is small in size and has an ultra - wide angle, it can satisfactorily correct various aberrations to obtain excellent optical performance.

[0156] [Fourth Example]

[0157] A fourth example will be described in which specific numerical values are applied to Figure 1 the camera module 11 shown. Similar to the first, second, and third examples, in the fourth example, the front - group optical system 31 includes the first lens L1 as Figure 14 shown, and the rear - group optical system 33 includes the second lens L2 to the sixth lens L6 as Figure 14 shown.

[0158] The aperture stop 32 located in the rear - group optical system 33 is disposed on the image - forming surface side with respect to the vertex of the first surface of the second lens L2 and on the object side with respect to the second surface of the second lens L2.

[0159] Figure 15A Shows the lens data as the fourth example: radius of curvature R, surface distance D, refractive index Nd, and Abbe number vd.

[0160] Figure 15B Shows the values of the focal length f, F - number Fno, viewing angle, total lens length, and sensor size of the entire system, Figure 15C Shows the focal length values of the first lens L1 to the sixth lens L6.

[0161] Figure 15D Shows the values of TTL / ImgCircle that satisfy the relationship 0.8 < TTL / ImgCircle < 1.1, the values of v5 - v3 that satisfy the relationship 20 < v5 - v3, and the values of f4 / f5 that satisfy the relationship 0.15 < f4 / f5 < 10.0.

[0162] Figure 16The curvature radius of each of the first lens L1 to the sixth lens L6, the conic coefficient of each side of each lens, and the first aspherical coefficient to the twenty-second aspherical coefficient are shown.

[0163] Figure 17 Each aberration of the above-described fourth example is shown. As can be seen from the above aberration diagram, obviously, although the camera module 11 of the fourth example is small in size and has an ultra-wide angle, it can satisfactorily correct various aberrations to obtain excellent optical performance.

[0164] [Fifth Example]

[0165] A fifth example in which specific numerical values are applied to the Figure 1 shown camera module 11 will be described. Similar to the first to fourth examples, in the fifth example, the front group optical system 31 includes the first lens L1 as Figure 18 shown, and the rear group optical system 33 includes the second lens L2 to the sixth lens L6 as Figure 18 shown.

[0166] The aperture stop 32 located in the rear group optical system 33 is disposed on the image formation surface side with respect to the vertex of the first surface of the second lens L2 and on the object side with respect to the second surface of the second lens L2.

[0167] Figure 19A The lens data for the fifth example are shown: the curvature radius R, the surface distance D, the refractive index Nd, and the Abbe number vd.

[0168] Figure 19B The values of the focal length f, the F-number Fno, the viewing angle, the total lens length, and the sensor size of the entire system are shown, Figure 19C The focal length values of the first lens L1 to the sixth lens L6 are shown.

[0169] Figure 19D The values of TTL / ImgCircle satisfying the relationship 0.8 < TTL / ImgCircle < 1.1, the values of v5 - v3 satisfying the relationship 20 < v5 - v3, and the values of f4 / f5 satisfying the relationship 0.15 < f4 / f5 < 10.0 are shown.

[0170] Figure 20 The curvature radius of each of the first lens L1 to the sixth lens L6, the conic coefficient of each side of each lens, and the first aspherical coefficient to the twenty-second aspherical coefficient are shown.

[0171] Figure 21 Each aberration of the above-described fifth example is shown. As can be seen from the above aberration diagram, obviously, although the camera module 11 of the fifth example is small in size and has an ultra-wide angle, it can satisfactorily correct various aberrations to obtain excellent optical performance.

[0172] [Sixth Example]

[0173] A sixth example of applying specific numerical values to Figure 1 the camera module 11 shown will be described. Similar to the first to fifth examples, in the sixth example, the front optical system 31 includes, as Figure 22 shown, the first lens L1, and the rear optical system 33 includes, as Figure 22 shown, the second lens L2 to the sixth lens L6.

[0174] The aperture stop 32 located in the rear optical system 33 is disposed on the image formation surface side with respect to the vertex of the first surface of the second lens L2 and on the object side with respect to the second surface of the second lens L2.

[0175] Figure 23A Lens data as the sixth example, such as the radius of curvature R, surface distance D, refractive index Nd, and Abbe number vd, are shown.

[0176] Figure 23B Values of the focal length f, F-number Fno, viewing angle, total lens length, and sensor size of the entire system are shown, Figure 23C and the focal length values of the first lens L1 to the sixth lens L6 are shown.

[0177] Figure 23D Values of TTL / ImgCircle satisfying the relationship 0.8 < TTL / ImgCircle < 1.1, values of v5–v3 satisfying the relationship 20 < v5 - v3, and values of f4 / f5 satisfying the relationship 0.15 < f4 / f5 < 10.0 are shown.

[0178] Figure 24 The radius of curvature of each of the first lens L1 to the sixth lens L6, the conic coefficient of each side of each lens, and the first aspherical coefficient to the twenty-second aspherical coefficient are shown.

[0179] Figure 25 The aberrations of the above sixth example are shown. From the above aberration diagrams, it is obvious that although the camera module 11 of the sixth example is small in size and has an ultra-wide angle, it can satisfactorily correct various aberrations to obtain excellent optical performance.

[0180] [Seventh Example]

[0181] A seventh example of applying specific numerical values to Figure 1 the camera module 11 shown will be described. Similar to the first to sixth examples, in the seventh example, the front optical system 31 includes, as Figure 26 shown, the first lens L1, and the rear optical system 33 includes, as Figure 26 shown, the second lens L2 to the sixth lens L6.

[0182] The aperture stop 32 in the rear optical system 33 is disposed on the image-forming surface side with respect to the vertex of the first surface of the second lens L2 and on the object side with respect to the second surface of the second lens L2.

[0183] Figure 27A Lens data for the seventh example is shown: radius of curvature R, surface distance D, refractive index Nd, and Abbe number vd.

[0184] Figure 27B Values of the focal length f, F-number Fno, viewing angle, total lens length, and sensor size of the entire system are shown, Figure 27C Values of the focal lengths of the first lens L1 to the sixth lens L6 are shown.

[0185] Figure 27D Values of TTL / ImgCircle satisfying the relationship 0.8 < TTL / ImgCircle < 1.1, values of v5 - v3 satisfying the relationship 20 < v5 - v3, and values of f4 / f5 satisfying the relationship 0.15 < f4 / f5 < 10.0 are shown.

[0186] Figure 28 The radius of curvature of each of the first lens L1 to the sixth lens L6, the conic coefficient of each lens on each side, and the first aspherical coefficient to the twenty-second aspherical coefficient are shown.

[0187] Figure 29 Aberrations of the above seventh example are shown. It can be seen from the above aberration diagrams that, apparently, although the camera module 11 of the seventh example is small in size and has an ultra-wide angle, it can satisfactorily correct various aberrations to obtain excellent optical performance.

[0188] In the description of the embodiments of the present disclosure, it should be understood that terms such as "central", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" should be interpreted as referring to the directions or positions described or shown in the drawings when being discussed. These related terms are only used to simplify the description of the present disclosure and do not indicate or imply that the devices or elements mentioned must have a specific direction or must be constructed or operated in a specific direction. Therefore, these terms cannot be construed as limiting the present disclosure.

[0189] In addition, the terms such as "first" and "second" used in this text are for descriptive purposes and are not intended to indicate or imply relative importance or significance, nor to imply the number of the indicated technical features. Therefore, the features defined as "first" and "second" may include one or more of such features. In the description of the specification of this disclosure, unless otherwise specified, "a plurality of" means "two or more than two".

[0190] In the description of the embodiments of this disclosure, unless otherwise specified or restricted, terms such as "installed", "connected", "coupled", etc. are widely used and may be, for example, a fixed connection, a detachable connection, or an integral connection, may also be a mechanical or electrical connection, may also be a direct connection or an indirect connection through an intermediate structure, and may also be the internal communication between two elements that can be understood by those skilled in the art according to specific situations.

[0191] In the embodiments of this disclosure, unless otherwise specified or restricted, the structure where a first feature is "on" or "under" a second feature may include an embodiment where the first feature is in direct contact with the second feature, and may also include an embodiment where the first feature and the second feature are not in direct contact with each other, but are in contact through an additional feature formed therebetween. In addition, the first feature that is "(in contact) on the second feature", "(not in contact) above the second feature", or "(may be in contact through an additional feature) on the second feature" may include embodiments where the first feature is orthogonally or obliquely "(in contact) on the second feature", "(not in contact) above the second feature", or "(may be in contact through an additional feature) on the second feature", or only means that the height where the first feature is located is higher than the height of the second feature; while the first feature that is "under the second feature", "directly under the second feature", or "at the bottom of the second feature" may include embodiments where the first feature is orthogonally or obliquely "under the second feature", "directly under the second feature", or "at the bottom of the second feature", or only means that the height where the first feature is located is lower than the height of the second feature.

[0192] The above specification provides various embodiments and examples to implement different structures of this disclosure. To simplify this disclosure, specific elements and settings are described above. However, these elements and settings are only examples and are not intended to limit this disclosure. In addition, reference numerals and / or reference letters may be repeated in different examples of this disclosure. This repetition is for simplicity and clarity and does not refer to the relationship between different embodiments and / or settings. In addition, this disclosure provides examples of different processes and materials. However, those skilled in the art should understand that other processes and / or materials may also be applied.

[0193] As used throughout the specification, "embodiment", "some embodiments", "exemplary embodiment", "exemplary embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present disclosure. Thus, the above phrases appearing throughout the specification do not necessarily refer to the same embodiment or example of the present disclosure. In addition, the specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0194] Any process or method described in a flowchart or otherwise herein can be understood to include one or more modules, segments, or portions of code for executable instructions for implementing specific logical functions or steps in the process, and the scope of the preferred embodiments of the present disclosure includes other implementations, where those skilled in the art should understand that the functions can be implemented in a sequence different from that shown or discussed, including in substantially the same sequence or in the reverse sequence.

[0195] The logic and / or steps described otherwise herein or shown in a flowchart, e.g., a particular sequence listing of executable instructions for implementing a logical function, can be embodied in any computer-readable medium and used by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, a system including a processor, or other systems that can obtain the instructions from the instruction execution system, apparatus, and device that execute the instructions. For the purposes of the specification, a "computer-readable medium" can be any device adapted to include, store, communicate, propagate, or transport a program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples of the computer-readable medium include, but are not limited to: an electrical connection having one or more wires (electronic device), a portable computer case (magnetic device), a random access memory (RAM), a read only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium can even be paper or other suitable medium on which a program can be printed, because, for example, when the program needs to be obtained electronically, the paper or other suitable medium can be optically scanned and then compiled, decoded, or processed in other suitable ways, and then the program can be stored in a computer memory.

[0196] It should be understood that each part of the present disclosure can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, similar to another embodiment, the steps or methods can be implemented by one or a combination of the following techniques known in the art: discrete logic circuits with logic gate circuits for implementing data signal logic functions, application-specific integrated circuits with appropriate combinations of logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

[0197] Those skilled in the art should understand that all or part of the steps in the above exemplary methods of the present disclosure can be implemented by using hardware related to program commands. When the program runs on a computer, it can be stored in a computer-readable storage medium, and the program includes one or a combination of the steps in the method embodiments of the present disclosure.

[0198] In addition, each functional unit of the embodiments of the present disclosure can be integrated in a processing module, or these units can be physically separated, or two or more units can be integrated in a processing module. The integrated module can be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, the integrated module can be stored in a computer-readable storage medium.

[0199] The above storage medium can be a read-only memory, a disk, a CD, etc.

[0200] Although the embodiments of the present disclosure have been shown and described, those skilled in the art should understand that these embodiments are illustrative and should not be construed as limiting the present disclosure, and changes, modifications, substitutions, and variations can be made in the embodiments without departing from the scope of the present disclosure.

Claims

1. An optical imaging lens in an optical system, the optical imaging lens having six lenses with refractive power, sequentially including from the object side: A first lens with negative refractive power, the first lens having a concave surface with an inflection point facing the object side; A second lens with positive refractive power; A third lens with negative refractive power; A fourth lens with positive refractive power, the fourth lens having a concave surface without an inflection point facing the object side; A fifth lens with positive refractive power near the optical axis, the outermost part of the fifth lens having a greater thickness than the thickness of the fifth lens on the optical axis; And A sixth lens with negative refractive power, wherein, the maximum viewing angle is equal to or greater than 100 degrees; The optical imaging lens satisfies the following conditional expression: 20 < ν5 – ν3, where ν5 is the Abbe number of the fifth lens and ν3 is the Abbe number of the third lens; and The optical imaging lens satisfies the following conditional expression: 0.15 < f4 / f5 < 10.0, where f4 is the focal length of the fourth lens and f5 is the focal length of the fifth lens.

2. The optical imaging lens according to claim 1, wherein The optical imaging lens satisfies the following conditional expression: 0.8 < TTL / ImgCircle < 1.1, wherein, TTL is the length from the surface on the optical axis on the object side of the first lens to the focus of the entire lens system; and ImgCircle is the diagonal length of the effective pixel region of the imaging surface of the optical imaging lens.

3. The optical imaging lens according to claim 1, wherein, The optical imaging lens includes an aperture stop between the first lens and the second lens.

4. The optical imaging lens according to claim 1, wherein, The lens located on the outermost imaging surface side has an aspherical shape with an inflection point, and the lens is formed of plastic.

5. A camera module, including an optical imaging lens and an image sensor, the image sensor outputting an image signal according to the optical image formed by the optical imaging lens, Among them, The optical imaging lens in the optical system has six lenses with refractive power, sequentially including from the object side: A first lens with negative refractive power, the first lens having a concave surface with an inflection point facing the object side; A second lens with positive refractive power; A third lens with negative refractive power; A fourth lens with positive refractive power, the fourth lens having a concave surface without an inflection point facing the object side; A fifth lens with positive refractive power near the optical axis, the outermost part of the fifth lens having a greater thickness than the thickness of the fifth lens on the optical axis; and A sixth lens with negative refractive power, wherein, the maximum viewing angle is equal to or greater than 100 degrees; The optical imaging lens satisfies the following conditional expression: 20 < ν5 – ν3, where ν5 is the Abbe number of the fifth lens and ν3 is the Abbe number of the third lens; and The optical imaging lens satisfies the following conditional expression: 0.15 < f4 / f5 < 10.0, where f4 is the focal length of the fourth lens and f5 is the focal length of the fifth lens.

6. An imaging device, including the camera module according to claim 5.

Images