Camera lens, imaging device and electronic device

Abstract

The present invention discloses a camera lens, an imaging device, and an electronic device. The camera lens sequentially includes, from the object side to the image side, a first lens having a positive refractive power, a second lens having a refractive power, a third lens having a negative refractive power, a fourth lens having a refractive power, a fifth lens having a refractive power, and a sixth lens having a negative refractive power. The object side surface of the first lens is a convex surface. Both the object side surface and the image side surface of the fifth lens are aspherical surfaces. At least one surface of the object side surface and the image side surface of the sixth lens has at least one inflection point. The camera lens satisfies the following conditional formula: f12 / f < 1.5; where f12 is the combined focal length of the first lens and the second lens, and f is the focal length of the camera lens. The camera lens not only meets the requirements of miniaturization but also meets the requirements of high pixels. In addition, the reasonable configuration of the combined focal length of the first lens and the second lens can effectively shorten the total length of the camera lens and avoid causing excessive aberration.

Description

Technical Field

[0001] The present invention relates to optical imaging technology, and particularly to a camera lens, an image pickup device, and an electronic device. Background Art

[0002] Electronic devices such as smart phones and tablets are generally equipped with camera lenses to achieve the photographing function. With the advancement of semiconductor process technology, the pixel size of the photosensitive element has been reduced. Coupled with the current trend of electronic products towards a compact and lightweight design with excellent functionality, miniaturized camera lenses with good imaging quality have become the mainstream in the market. Therefore, how to provide a miniaturized and high-pixel camera lens has become an urgent problem to be solved. Summary of the Invention

[0003] Embodiments of the present invention provide a camera lens, an image pickup device, and an electronic device.

[0004] The camera lens according to an embodiment of the present invention sequentially includes, from the object side to the image side, a first lens having a positive refractive power, a second lens having a refractive power, a third lens having a negative refractive power, a fourth lens having a refractive power, a fifth lens having a refractive power, and a sixth lens having a negative refractive power. The object side surface of the first lens is convex. The object side surface and the image side surface of the fifth lens are both aspherical. At least one surface of the object side surface and the image side surface of the sixth lens has at least one inflection point. The camera lens satisfies the following conditional formula: f12 / f < 1.5; where f12 is the combined focal length of the first lens and the second lens, and f is the focal length of the camera lens.

[0005] The camera lens according to an embodiment of the present invention meets both the miniaturization requirement and the high-pixel requirement. In addition, the reasonable configuration of the combined focal length of the first lens and the second lens can effectively shorten the total length of the camera lens and avoid causing excessive aberration.

[0006] In some embodiments, the second lens has a positive refractive power, and the image side surface of the second lens is convex. The fifth lens has a negative refractive power, and the image side surface of the fifth lens is concave.

[0007] The cooperation between the image side surface of the fifth lens and the object side surface of the sixth lens is beneficial to correcting aberration and meeting the high-pixel requirement.

[0008] In some embodiments, the second lens has a negative refractive power, and the image side surface of the second lens is concave. The fifth lens has a positive refractive power, and the object side surface of the fifth lens is concave.

[0009] The cooperation between the image side surface of the second lens and the object side surface of the third lens is beneficial to correcting aberration and meeting the high-pixel requirement.

[0010] In some embodiments, the camera lens satisfies the following conditional formula: |f / f5| + |f / f6| < 0.5; where f5 is the focal length of the fifth lens and f6 is the focal length of the sixth lens.

[0011] When the above conditional formula is satisfied, the refractive powers of the fifth lens and the sixth lens are not too large, which can reduce the generation of system aberrations, effectively shorten the total system length, and achieve the goal of miniaturization.

[0012] In some embodiments, the camera lens satisfies the following conditional formula: -40 < V2 - (V3 + V4) / 2 < 40; where V2 is the dispersion coefficient of the second lens, V3 is the dispersion coefficient of the third lens, and V4 is the dispersion coefficient of the fourth lens.

[0013] When the above conditional formula is satisfied, through the reasonable combination of the materials of each lens, it is beneficial to optimize aberrations and correct the chromatic aberration of the system.

[0014] In some embodiments, the camera lens satisfies the following conditional formula: TTL / ImgH < 0.75; where TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis, and ImgH is half of the diagonal length of the effective photosensitive area.

[0015] When the above conditional formula is satisfied, it is beneficial to maintain the miniaturization of the system for mounting on thin, light, and portable electronic products.

[0016] In some embodiments, the camera lens satisfies the following conditional formula: SDmax / EPD < 1.5; where SDmax is the maximum effective radius from the object side surface to the imaging surface in the camera lens, and EPD is the entrance pupil diameter of the camera lens.

[0017] When the above conditional formula is satisfied, it helps to miniaturize the camera lens, provides a larger entrance pupil, expands the aperture, is beneficial to improving the imaging quality, and at the same time expands the usage time and space of the carrier.

[0018] In some embodiments, the camera lens satisfies the following conditional formula: Zc62 / Yc62 < 0.2; where on the image side surface of the sixth lens, except for the intersection point with the optical axis, for all planes perpendicular to the optical axis on the image side surface, for all points on the plane and the image side surface, Zc62 is the horizontal distance between the tangent point and the intersection point of the image side surface and the optical axis, and Yc62 is the vertical distance between the tangent point and the optical axis.

[0019] When the above conditional formula is satisfied, it is beneficial to reduce the molding difficulty of the sixth lens and improve the product yield.

[0020] In some embodiments, the camera lens satisfies the following conditional expressions: |SAG51| ≤ 0.35, |SAG52| ≤ 0.66; where SAG51 is the horizontal displacement distance on the optical axis from the intersection of the object side of the fifth lens and the optical axis to the maximum effective radius of the object side of the fifth lens, and SAG52 is the horizontal displacement distance on the optical axis from the intersection of the image side of the fifth lens and the optical axis to the maximum effective radius of the image side of the fifth lens.

[0021] When the above conditional expressions are satisfied, it is beneficial to reduce the processing difficulty and improve the yield.

[0022] In some embodiments, the camera lens satisfies the following conditional expressions: |SAG51| ≤ 0.31, |SAG52| ≤ 0.22.

[0023] When the above conditional expressions are satisfied, it is beneficial to further reduce the processing difficulty and improve the yield.

[0024] In some embodiments, the camera lens satisfies the following conditional expression: CT1 / f < 0.2; where CT1 is the thickness of the first lens on the optical axis.

[0025] When the above conditional expression is satisfied, the thickness of the first lens is not too large, which is convenient for demolding during molding, improves the yield, and is beneficial to reducing the volume of the overall lens.

[0026] In some embodiments, the camera lens satisfies the following conditional expression: THI / TTL > 0.35; where THI is the distance of the exit pupil of the camera lens, and TTL is the distance on the optical axis from the object side of the first lens to the imaging surface.

[0027] When the above conditional expression is satisfied, the exit pupil is far from the imaging surface, and the light will be incident on the electronic photosensitive element in a nearly perpendicular manner, having a telecentric characteristic. The telecentric characteristic is extremely important for the photosensitive ability of the solid-state electronic photosensitive element, which can improve the photosensitive sensitivity of the electronic photosensitive element and reduce the possibility of vignetting in the system.

[0028] The imaging device according to the embodiment of the present invention includes the camera lens and the electronic photosensitive element described in any one of the above embodiments, and the electronic photosensitive element is disposed on the imaging surface of the camera lens.

[0029] The electronic device according to the embodiment of the present invention includes a housing and the imaging device described in any one of the above embodiments, and the imaging device is mounted on the housing.

[0030] Additional aspects and advantages of the embodiments of the present invention will be given in part in the following description, will become apparent in part from the following description, or will be understood through the practice of the present invention. Description of the Drawings

[0031] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0032] Figure 1 is a schematic structural diagram of a camera lens according to a first embodiment of the present invention;

[0033] Figures 2 to 4 are respectively the longitudinal aberration diagram (mm), field curvature diagram (mm), and distortion diagram (%) of the camera lens in the first embodiment;

[0034] Figure 5 is a schematic structural diagram of a camera lens according to a second embodiment of the present invention;

[0035] Figures 6 to 8 are respectively the longitudinal aberration diagram (mm), field curvature diagram (mm), and distortion diagram (%) of the camera lens in the second embodiment;

[0036] Figure 9 is a schematic structural diagram of a camera lens according to a third embodiment of the present invention;

[0037] Figures 10 to 12 are respectively the longitudinal aberration diagram (mm), field curvature diagram (mm), and distortion diagram (%) of the camera lens in the third embodiment;

[0038] Figure 13 is a schematic structural diagram of a camera lens according to a fourth embodiment of the present invention;

[0039] Figures 14 to 16 are respectively the longitudinal aberration diagram (mm), field curvature diagram (mm), and distortion diagram (%) of the camera lens in the fourth embodiment;

[0040] Figure 17 is a schematic structural diagram of an image capturing device according to an embodiment of the present invention;

[0041] Figure 18 is a schematic structural diagram of an electronic device according to an embodiment of the present invention. Detailed Embodiments

[0042] The following describes in detail the embodiments of the present invention. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0043] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0046] Please also read Figure 1 , Figure 5 , Figure 9 and Figure 13 The camera lens 10 of the embodiment of the present invention includes, from the object side to the image side, a first lens L1 with positive refractive power, a second lens L2 with refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with refractive power, a fifth lens L5 with refractive power, and a sixth lens L6 with negative refractive power.

[0047] The first lens L1 has an object side S1 and an image side S2. The object side S1 of the first lens L1 is convex. The second lens L2 has an object side S3 and an image side S4. The third lens L3 has an object side S5 and an image side S6. The fourth lens L4 has an object side S7 and an image side S8. The fifth lens L5 has an object side S9 and an image side S10. Both the object side S9 and the image side S10 of the fifth lens L5 are aspherical surfaces. The fifth lens L5 has an object side S11 and an image side S12. At least one surface of the object side S11 and the image side S12 of the sixth lens L6 has at least one inflection point. Specifically, the object side S11 of the sixth lens L6 has one or more inflection points, and the image side S12 of the sixth lens L6 does not have an inflection point; or, the image side S12 of the sixth lens L6 has one or more inflection points, and the object side S11 of the sixth lens L6 does not have an inflection point; or, the object side S11 of the sixth lens L6 has one or more inflection points, and the image side S12 of the sixth lens L6 also has one or more inflection points.

[0048] The imaging lens 10 according to the embodiment of the present invention meets both the requirements of miniaturization and high pixel.

[0049] The imaging lens 10 satisfies the following conditional formula: f12 / f < 1.5; where f12 is the combined focal length of the first lens L1 and the second lens L2, and f is the focal length of the imaging lens 10. That is to say, f12 / f can be any value less than 1.5 and greater than or equal to 0.28. For example, this value can be 0.3, 0.6, 0.9, 1.2, 1.4, etc.

[0050] When the above conditional formula is satisfied, the reasonable configuration of the combined focal length of the first lens L1 and the second lens L2 can effectively shorten the total length of the imaging lens 10 and avoid causing excessive aberration.

[0051] The imaging lens 10 may further include an infrared filter L7. The infrared filter L7 has an object side S13 and an image side S14. The infrared filter L7 is used to adjust the light wavelength range of imaging, specifically for isolating infrared light from entering the electronic photosensitive element 20 (as Figure 17 shown), so as to prevent infrared light from affecting the normal image color and clarity. When the imaging lens 10 is used for imaging, the light emitted or reflected by the object to be photographed enters the imaging lens 10 from the object side direction and sequentially passes through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the infrared filter L7, and finally converges on the imaging surface S15.

[0052] The imaging lens 10 may further include a diaphragm STO. The diaphragm STO may be an aperture diaphragm or a field stop. In the embodiments of the present invention, the case where the diaphragm STO is an aperture diaphragm is taken as an example for illustration. The diaphragm STO may be disposed between the object to be photographed and the first lens L1, or on the surface of any one lens, or between any two lenses, or between the sixth lens L6 and the infrared filter L7.

[0053] In some embodiments, the second lens L2 has a positive refractive power, and the image side S4 of the second lens L2 is a convex surface. The fifth lens L5 has a negative refractive power, and the image side S10 of the fifth lens L5 is a concave surface.

[0054] The cooperation between the image side S10 of the fifth lens L5 and the object side S11 of the sixth lens L6 is conducive to correcting aberration and meeting the requirements of high pixel.

[0055] In some embodiments, the second lens L2 has a negative refractive power, and the image side S4 of the second lens L2 is a concave surface. The fifth lens L5 has a positive refractive power, and the object side S9 of the fifth lens L5 is a concave surface.

[0056] The cooperation between the image side S4 of the second lens L2 and the object side S5 of the third lens L3 is conducive to correcting aberration and meeting the requirements of high pixel.

[0057] In some embodiments, the imaging lens 10 satisfies the following conditional formula: |f / f5| + |f / f6| < 0.5; where f5 is the focal length of the fifth lens L5, and f6 is the focal length of the sixth lens L6. That is to say, |f / f5| + |f / f6| can be any value less than 0.5. For example, this value can be 0.1, 0.2, 0.3, 0.4, 0.5, etc.

[0058] When the above conditional formula is satisfied, the refractive powers of the fifth lens L5 and the sixth lens L6 will not be too large, which can reduce the generation of system aberration, effectively shorten the total length of the system, and achieve the goal of miniaturization.

[0059] In some embodiments, the imaging lens 10 satisfies the following conditional formula: -40 < V2 - (V3 + V4) / 2 < 40; where V2 is the dispersion coefficient of the second lens L2, V3 is the dispersion coefficient of the third lens L3, and V4 is the dispersion coefficient of the fourth lens L4. That is to say, V2 - (V3 + V4) / 2 can be any value within the interval (-40, 40). For example, this value can be -30, -10, 0, 10, 30, etc.

[0060] When the above conditional formula is satisfied, through the reasonable combination of the materials of each lens (i.e., the second lens L2, the third lens L3, and the fourth lens L4), it is conducive to optimizing aberration and correcting system chromatic aberration.

[0061] In some embodiments, the camera lens 10 satisfies the following conditional formula: TTL / ImgH < 0.75; where TTL is the distance on the optical axis from the object side surface S1 of the first lens L1 to the imaging surface S15, and ImgH is half of the diagonal length of the effective photosensitive area. That is to say, TTL / ImgH can be any value less than 0.75. For example, this value can be 0.3, 0.4, 0.5, 0.6, 0.7, etc.

[0062] When the above conditional formula is satisfied, it is beneficial to maintain the miniaturization of the system for being mounted on thin, light, and portable electronic products.

[0063] In some embodiments, the camera lens 10 satisfies the following conditional formula: SDmax / EPD < 1.5; where SDmax is the maximum effective radius from the object side surface S1 to the imaging surface S15 in the camera lens 10, and EPD is the entrance pupil diameter of the camera lens 10. That is to say, SDmax / EPD can be any value less than 1.5 and greater than or equal to 1.15. For example, this value can be 1.2, 1.3, etc.

[0064] When the above conditional formula is satisfied, it helps to miniaturize the camera lens 10, provides a larger entrance pupil, expands the aperture, is beneficial to improving the imaging quality, and at the same time expands the usage time and space of the carrier.

[0065] In some embodiments, the camera lens 10 satisfies the following conditional formula: Zc62 / Yc62 < 0.2; on the image side surface S12 of the sixth lens L6, except for the intersection point with the optical axis, for all planes perpendicular to the optical axis on the image side surface S12, and for all points of the tangent plane with the image side surface S12, Zc62 is the horizontal distance between the tangent point and the intersection point of the image side surface S12 with the optical axis, and Yc62 is the vertical distance between the tangent point and the optical axis. That is to say, Zc62 / Yc62 can be any value less than 0.2. For example, this value can be 0.02, 0.05, 0.10, 0.15, 0.18, etc.

[0066] When the above conditional formula is satisfied, it is beneficial to reduce the molding difficulty of the sixth lens L6 and improve the product yield.

[0067] In some embodiments, the imaging lens 10 satisfies the following conditional expressions: |SAG51| ≤ 0.35, |SAG52| ≤ 0.66; where SAG51 is the horizontal displacement distance on the optical axis from the intersection point of the object side surface S9 of the fifth lens L5 and the optical axis to the maximum effective radius of the object side surface S9 of the fifth lens L5, and SAG52 is the horizontal displacement distance on the optical axis from the intersection point of the image side surface S10 of the fifth lens L5 and the optical axis to the maximum effective radius of the image side surface S10 of the fifth lens L5. That is to say, |SAG51| can be any value less than or equal to 0.35. For example, this value can be 0.05, 0.15, 0.20, 0.25, 0.33, etc. |SAG52| can be any value less than or equal to 0.66. For example, this value can be 0.10, 0.20, 0.30, 0.40, 0.50, etc.

[0068] When the above conditional expressions are satisfied, it is beneficial to reduce the processing difficulty and improve the yield.

[0069] Furthermore, the imaging lens 10 satisfies the following conditional expressions: |SAG51| ≤ 0.31, |SAG52| ≤ 0.22. That is to say, |SAG51| can be any value less than or equal to 0.31. For example, this value can be 0.05, 0.15, 0.20, 0.25, 0.30, etc. |SAG52| can be any value less than or equal to 0.22. For example, this value can be 0.05, 0.10, 0.15, 0.20, 0.21, etc.

[0070] When the above conditional expressions are satisfied, it is beneficial to further reduce the processing difficulty and improve the yield.

[0071] In some embodiments, the imaging lens 10 satisfies the following conditional expression: CT1 / f < 0.2; where CT1 is the thickness of the first lens L1 on the optical axis. That is to say, CT1 / f can be any value less than 0.2 and greater than or equal to 0.12. For example, this value can be 0.15, 0.18, etc.

[0072] When the above conditional expression is satisfied, the thickness of the first lens L1 is not too large, which is convenient for demolding during molding, improves the yield, and is beneficial to reducing the volume of the overall lens.

[0073] In some embodiments, the imaging lens 10 satisfies the following conditional expression: THI / TTL > 0.35; where THI is the distance of the exit pupil of the imaging lens 10, and TTL is the distance on the optical axis from the object side surface S1 of the first lens L1 to the imaging surface S15. That is to say, THI / TTL can be any value greater than 0.2. For example, this value can be 0.37, 0.40, 0.50, 0.60, 0.70, etc.

[0074] When the above conditional expression is satisfied, the exit pupil is far from the imaging surface S15, and the light rays will be incident on the electronic photosensitive element 20 in a manner close to perpendicular incidence, having a telecentric characteristic. The telecentric characteristic is extremely important for the photosensitive ability of the solid-state electronic photosensitive element 20, which can improve the photosensitive sensitivity of the electronic photosensitive element 20 and reduce the possibility of vignetting in the system.

[0075] In some embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspherical lenses. The aspherical surface profile is determined by the following formula:

[0076]

[0077] Where Z is the longitudinal distance between any point on the aspherical surface and the surface vertex, r is the distance from any point on the aspherical surface to the optical axis, c is the vertex curvature (the reciprocal of the radius of curvature), k is the conic constant, and Ai is the correction coefficient of the i-th order of the aspherical surface.

[0078] In this way, the imaging lens 10 can effectively reduce the total length of the imaging lens 10 by adjusting the radius of curvature of each lens surface and the aspherical coefficient, and can effectively correct the system aberration and improve the imaging quality.

[0079] <First Embodiment>

[0080] Please refer to Figures 1 to 4 , in the first embodiment, the imaging lens 10 sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 from the object side to the image side.

[0081] The first lens L1 has a positive refractive power and is made of plastic. The object side surface S1 of the first lens L1 is convex at the optical axis and also convex at the circumference. The image side surface S2 of the first lens L1 is concave at the optical axis and also concave at the circumference. Both the object side surface S1 and the image side surface S2 of the first lens L1 are aspherical surfaces.

[0082] The second lens L2 has a positive refractive power and is made of plastic. The object side surface S3 of the second lens L2 is convex at the optical axis and also convex at the circumference. The image side surface S4 of the second lens L2 is convex at the optical axis and also convex at the circumference. Both the object side surface S3 and the image side surface S4 of the second lens L2 are aspherical surfaces.

[0083] The third lens L3 has a negative refractive power and is made of plastic. The object side surface S5 of the third lens L3 is convex at the optical axis and also convex at the circumference. The image side surface S6 of the third lens L3 is concave at the optical axis and also concave at the circumference. Both the object side surface S5 and the image side surface S6 of the third lens L3 are aspherical surfaces.

[0084] The fourth lens L4 has a positive refractive power and is made of plastic. The object side surface S7 of the fourth lens L4 is convex at the optical axis and concave at the circumference. The image side surface S8 of the fourth lens L4 is concave at the optical axis and convex at the circumference. Both the object side surface S7 and the image side surface S8 of the fourth lens L4 are aspherical surfaces.

[0085] The fifth lens L5 has a negative refractive power and is made of plastic. The object side surface S9 of the fifth lens L5 is convex at the optical axis and concave at the circumference. The image side surface S10 of the fifth lens L5 is concave at the optical axis and convex at the circumference. Both the object side surface S9 and the image side surface S10 of the fifth lens L5 are aspherical surfaces.

[0086] The sixth lens L6 has a negative refractive power and is made of plastic. The object side surface S11 of the sixth lens L6 is convex at the optical axis and concave at the circumference. The image side surface S12 of the sixth lens L6 is concave at the optical axis and convex at the circumference. Both the object side surface S5 and the image side surface S6 of the sixth lens L6 are aspherical surfaces.

[0087] In the first embodiment, the focal length f of the imaging lens 10 is 3.96 mm, the f-number FNO of the imaging lens 10 is 1.78, and half of the field of view angle of the imaging lens 10, 1 / 2 FOV, is 39.22 degrees. The imaging lens 10 satisfies the conditional expressions: |f / f5| + |f / f6| = 0.19; f12 / f = 0.28; V2 - (V3 + V4) / 2 = 34; TTL / ImgH = 0.715; SDmax / EPD = 1.15; Zc62 / Yc62 = 0.15; |SAG51| = 0.31 mm, |SAG52| = 0.219 mm; CT1 / f = 0.13; THI / TTL = 0.42.

[0088] The imaging lens 10 satisfies the conditions in the following table:

[0089] Table 1

[0090]

[0091]

[0092] Table 2

[0093]

[0094] <Second Embodiment>

[0095] Please refer to Figures 5 to 8 , in the second embodiment, the imaging lens 10 sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 from the object side to the image side.

[0096] The first lens L1 has a positive refractive power and is made of plastic. The object side S1 of the first lens L1 is convex at the optical axis and also convex at the circumference. The image side S2 of the first lens L1 is concave at the optical axis and also concave at the circumference. Both the object side S1 and the image side S2 of the first lens L1 are aspherical surfaces.

[0097] The second lens L2 has a negative refractive power and is made of plastic. The object side S3 of the second lens L2 is concave at the optical axis and convex at the circumference. The image side S4 of the second lens L2 is concave at the optical axis and also concave at the circumference. Both the object side S3 and the image side S4 of the second lens L2 are aspherical surfaces.

[0098] The third lens L3 has a negative refractive power and is made of plastic. The object side S5 of the third lens L3 is convex at the optical axis and concave at the circumference. The image side S6 of the third lens L3 is concave at the optical axis and convex at the circumference. Both the object side S5 and the image side S6 of the third lens L3 are aspherical surfaces.

[0099] The fourth lens L4 has a negative refractive power and is made of plastic. The object side S7 of the fourth lens L4 is concave at the optical axis and concave at the circumference. The image side S8 of the fourth lens L4 is concave at the optical axis and convex at the circumference. Both the object side S7 and the image side S8 of the fourth lens L4 are aspherical surfaces.

[0100] The fifth lens L5 has a positive refractive power and is made of plastic. The object side S9 of the fifth lens L5 is concave at the optical axis and also concave at the circumference. The image side S10 of the fifth lens L5 is convex at the optical axis and also convex at the circumference. Both the object side S9 and the image side S10 of the fifth lens L5 are aspherical surfaces.

[0101] The sixth lens L6 has a negative refractive power and is made of plastic. The object side S11 of the sixth lens L6 is concave at the optical axis and convex at the circumference. The image side S12 of the sixth lens L6 is concave at the optical axis and convex at the circumference. Both the object side S5 and the image side S6 of the sixth lens L6 are aspherical surfaces.

[0102] In the second embodiment, the focal length f of the imaging lens 10 is 3.95 mm, the aperture number FNO of the imaging lens 10 is 1.86, and half of the field of view angle of the imaging lens 10, 1 / 2 FOV, is 40.72 degrees. The imaging lens 10 satisfies the conditional equations: |f / f5| + |f / f6| = 0.42; f12 / f = 1.14; V2 - (V3 + V4) / 2 = -1.8; TTL / ImgH = 0.67; SDmax / EPD = 1.25; Zc62 / Yc62 = 0.09; |SAG51| = 0.309 mm, |SAG52| = 0.651 mm; CT1 / f = 0.19; THI / TTL = 0.38.

[0103] The imaging lens 10 satisfies the conditions in the following table:

[0104] Table 3

[0105]

[0106] Table 4

[0107]

[0108] <Third Embodiment>

[0109] Please refer to Figures 9 to 12 , in the third embodiment, the imaging lens 10 sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 from the object side to the image side.

[0110] The first lens L1 has a positive refractive power and is made of plastic. The object side surface S1 of the first lens L1 is convex at the optical axis and also convex at the circumference. The image side surface S2 of the first lens L1 is concave at the optical axis and also concave at the circumference. Both the object side surface S1 and the image side surface S2 of the first lens L1 are aspherical surfaces.

[0111] The second lens L2 has a negative refractive power and is made of plastic. The object side surface S3 of the second lens L2 is convex at the optical axis and also convex at the circumference. The image side surface S4 of the second lens L2 is concave at the optical axis and also concave at the circumference. Both the object side surface S3 and the image side surface S4 of the second lens L2 are aspherical surfaces.

[0112] The third lens L3 has a negative refractive power and is made of plastic. The object side surface S5 of the third lens L3 is convex at the optical axis and concave at the circumference. The image side surface S6 of the third lens L3 is concave at the optical axis and convex at the circumference. Both the object side surface S5 and the image side surface S6 of the third lens L3 are aspherical surfaces.

[0113] The fourth lens L4 has a positive refractive power and is made of plastic. The object side surface S7 of the fourth lens L4 is convex at the optical axis and concave at the circumference. The image side surface S8 of the fourth lens L4 is concave at the optical axis and convex at the circumference. Both the object side surface S7 and the image side surface S8 of the fourth lens L4 are aspherical surfaces.

[0114] The fifth lens L5 has a positive refractive power and is made of plastic. The object side surface S9 of the fifth lens L5 is concave at the optical axis and also concave at the circumference. The image side surface S10 of the fifth lens L5 is convex at the optical axis and also convex at the circumference. Both the object side surface S9 and the image side surface S10 of the fifth lens L5 are aspherical surfaces.

[0115] The sixth lens L6 has a negative refractive power and is made of plastic. The object side surface S11 of the sixth lens L6 is concave at the optical axis and convex at the circumference. The image side surface S12 of the sixth lens L6 is concave at the optical axis and convex at the circumference. The object side surface S5 and the image side surface S6 of the sixth lens L6 are both aspherical surfaces.

[0116] In the third embodiment, the focal length f of the imaging lens 10 is 3.94 mm, the f-number FNO of the imaging lens 10 is 2.22, and half of the field of view angle of the imaging lens 10, 1 / 2 FOV, is 40.75 degrees. The imaging lens 10 satisfies the conditional expressions: |f / f5| + |f / f6| = 0.28; f12 / f = 1.46; V2 - (V3 + V4) / 2 = -36.46; TTL / ImgH = 0.7; SDmax / EPD = 1.33; Zc62 / Yc62 = 0.129; |SAG51| = 0.259 mm, |SAG52| = 0.383 mm; CT1 / f = 0.12; THI / TTL = 0.45.

[0117] The imaging lens 10 satisfies the conditions in the following table:

[0118] Table 5

[0119]

[0120] Table 6

[0121]

[0122]

[0123] <Fourth Embodiment>

[0124] Please refer to Figures 13 to 16 , in the fourth embodiment, the imaging lens 10 sequentially includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 from the object side to the image side.

[0125] The first lens L1 has a positive refractive power and is made of plastic. The object side surface S1 of the first lens L1 is convex at the optical axis and also convex at the circumference. The image side surface S2 of the first lens L1 is concave at the optical axis and also concave at the circumference. The object side surface S1 and the image side surface S2 of the first lens L1 are both aspherical surfaces.

[0126] The second lens L2 has a negative refractive power and is made of plastic. The object side surface S3 of the second lens L2 is convex at the optical axis and also convex at the circumference. The image side surface S4 of the second lens L2 is concave at the optical axis and also concave at the circumference. The object side surface S3 and the image side surface S4 of the second lens L2 are both aspherical surfaces.

[0127] The third lens L3 has a negative refractive power and is made of plastic. The object side surface S5 of the third lens L3 is convex at the optical axis and concave at the circumference. The image side surface S6 of the third lens L3 is concave at the optical axis and convex at the circumference. Both the object side surface S5 and the image side surface S6 of the third lens L3 are aspherical surfaces.

[0128] The fourth lens L4 has a positive refractive power and is made of plastic. The object side surface S7 of the fourth lens L4 is convex at the optical axis and concave at the circumference. The image side surface S8 of the fourth lens L4 is convex at the optical axis and also convex at the circumference. Both the object side surface S7 and the image side surface S8 of the fourth lens L4 are aspherical surfaces.

[0129] The fifth lens L5 has a positive refractive power and is made of plastic. The object side surface S9 of the fifth lens L5 is concave at the optical axis and also concave at the circumference. The image side surface S10 of the fifth lens L5 is convex at the optical axis and also convex at the circumference. Both the object side surface S9 and the image side surface S10 of the fifth lens L5 are aspherical surfaces.

[0130] The sixth lens L6 has a negative refractive power and is made of plastic. The object side surface S11 of the sixth lens L6 is concave at the optical axis and convex at the circumference. The image side surface S12 of the sixth lens L6 is concave at the optical axis and convex at the circumference. Both the object side surface S5 and the image side surface S6 of the sixth lens L6 are aspherical surfaces.

[0131] In the fourth embodiment, the focal length f of the imaging lens 10 is 3.96 mm, the f-number FNO of the imaging lens 10 is 1.78, and half of the field of view angle of the imaging lens 10, 1 / 2 FOV, is 39.22 degrees. The imaging lens 10 satisfies the conditional expressions: |f / f5| + |f / f6| = 0.465; f12 / f = 1.33; V2 - (V3 + V4) / 2 = -18.4; TTL / ImgH = 0.74; SDmax / EPD = 1.18; Zc62 / Yc62 = 0.14; |SAG51| = 0.254 mm, |SAG52| = 0.389 mm; CT1 / f = 0.16; THI / TTL = 0.51.

[0132] The imaging lens 10 satisfies the conditions in the following table:

[0133] Table 7

[0134]

[0135] Table 8

[0136]

[0137]

[0138] Please refer to Figure 17, the imaging device 100 according to an embodiment of the present invention includes the imaging lens 10 and the electronic photosensitive element 20 according to any of the above embodiments, and the electronic photosensitive element 20 is disposed on the imaging surface of the imaging lens 10. Among them, the electronic photosensitive element 20 may adopt a complementary metal oxide semiconductor (CMOS) photosensitive element or a charge-coupled device (CCD) photosensitive element.

[0139] Please refer to Figure 18 , the electronic device 1000 according to an embodiment of the present invention includes a housing 200 and the imaging device 100 according to any of the above embodiments, and the imaging device 100 is mounted on the housing 200. The electronic device 100 includes, but is not limited to, information terminal devices such as smart phones, mobile phones, and PDAs (Personal Digital Assistant), game consoles, PCs (personal computers), etc., and household electrical appliances with a camera function.

[0140] In the description of this specification, the descriptions with reference to the terms "certain embodiments", "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0141] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of the said features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0142] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An imaging lens, characterized in that, it has a total of six lenses with refractive power, and the imaging lens from the object side to the image side is in sequence: a first lens with positive refractive power, and the object side surface of the first lens is a convex surface; a second lens with refractive power; a third lens with negative refractive power; a fourth lens with refractive power; a fifth lens with refractive power, and both the object side surface and the image side surface of the fifth lens are aspherical surfaces; and a sixth lens with negative refractive power, and at least one surface of the object side surface and the image side surface of the sixth lens has at least one inflection point; the imaging lens satisfies the following conditional formula: 0.28 ≤ f12 / f < 1.5; wherein, f12 is the combined focal length of the first lens and the second lens, and f is the focal length of the imaging lens; the second lens has positive refractive power, and the image side surface of the second lens is a convex surface; the fifth lens has negative refractive power, and the image side surface of the fifth lens is a concave surface; the imaging lens satisfies the following conditional formula: |f / f5| + |f / f6| < 0.5; wherein, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens.

2. The imaging lens according to claim 1, characterized in that, the second lens has negative refractive power, and the image side surface of the second lens is a concave surface; the fifth lens has positive refractive power, and the object side surface of the fifth lens is a concave surface.

3. The imaging lens according to claim 1, characterized in that, the imaging lens satisfies the following conditional formula: -40 < V2 - (V3 + V4) / 2 < 40; wherein, V2 is the dispersion coefficient of the second lens, V3 is the dispersion coefficient of the third lens, and V4 is the dispersion coefficient of the fourth lens.

4. The imaging lens according to claim 1, characterized in that, the imaging lens satisfies the following conditional formula: TTL / ImgH < 0.75; wherein, TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface, and ImgH is half of the diagonal length of the effective photosensitive area.

5. The imaging lens according to claim 1, characterized in that, the imaging lens satisfies the following conditional formula: 1.15 ≤ SDmax / EPD < 1.5; wherein, SDmax is the maximum effective radius from the object side surface to the imaging surface in the imaging lens, and EPD is the entrance pupil diameter of the imaging lens.

6. The imaging lens according to claim 1, characterized in that, the imaging lens satisfies the following conditional formula: Zc62 / Yc62 < 0.2; wherein, on the image side surface of the sixth lens, except for the intersection point with the optical axis, for any plane perpendicular to the optical axis on the image side surface, and for any point on the intersection of the plane and the image side surface, Zc62 is the horizontal distance between the tangent point and the intersection point of the image side surface and the optical axis, and Yc62 is the vertical distance between the tangent point and the optical axis.

7. The imaging lens according to claim 1, characterized in that, the imaging lens satisfies the following conditional formula: |SAG51| ≤ 0.35, |SAG52| ≤ 0.66; Wherein, SAG51 is the horizontal displacement distance on the optical axis from the intersection of the object side surface of the fifth lens and the optical axis to the maximum effective radius of the object side surface of the fifth lens, and SAG52 is the horizontal displacement distance on the optical axis from the intersection of the image side surface of the fifth lens and the optical axis to the maximum effective radius of the image side surface of the fifth lens.

8. The imaging lens according to claim 7, wherein, the imaging lens satisfies the following conditional formula: |SAG51| ≤ 0.31, |SAG52| ≤ 0.

22.

9. The imaging lens according to claim 1, wherein, the imaging lens satisfies the following conditional formula: 0.12 ≤ CT1 / f < 0.2; wherein, CT1 is the thickness of the first lens on the optical axis.

10. The imaging lens according to claim 1, wherein, the imaging lens satisfies the following conditional formula: THI / TTL > 0.35; wherein, THI is the distance of the exit pupil of the imaging lens, and TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface.

11. An imaging device, wherein, the imaging device includes: the imaging lens according to any one of claims 1 to 10; and an electronic photosensitive element, and the electronic photosensitive element is disposed on the imaging surface of the imaging lens.

12. An electronic device, wherein, the electronic device includes: a housing; and the imaging device according to claim 11, and the imaging device is mounted on the housing.

Images