Optical imaging system, imaging device and electronic device

Abstract

The present invention provides an optical imaging system, which sequentially includes, from the object side to the image side: a first lens with positive optical power; a second lens with negative optical power; a third lens with optical power; a fourth lens with positive optical power; a fifth lens with optical power; a sixth lens with positive optical power; and a seventh lens with negative optical power; wherein, the optical imaging system satisfies the following relational expressions: 1.0 < f12 / f < 2.0; f / EPD ≤ 1.8; where f12 is the combined focal length of the first lens and the second lens, f is the total effective focal length of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging system. The optical imaging system of the present invention has high imaging quality, a large amount of incident light, and a small volume. The present invention also provides an image capturing device and an electronic device.

Description

Technical Field

[0001] The present invention relates to optical imaging technology, and particularly to an optical imaging system, an image capturing device, and an electronic device. Background Art

[0002] With the continuous development of camera-related technologies, taking pictures has become a standard function of smart electronic products, and consumers' demand for electronic products with ideal photo-taking effects is also increasing. With the application of optimized software algorithms, some high-pixel optical imaging systems have excellent photo-taking effects, bringing consumers an excellent experience. However, with the improvement of the performance and the increase in the size of common photosensitive elements such as charge-coupled devices (CCDs) or complementary metal-oxide-semiconductor elements (CMOSs), the number of pixels of the photosensitive element increases and the pixel size decreases, thus posing higher requirements for the miniaturization of the imaging lens. Moreover, in environments with insufficient light, such as at night, on rainy and cloudy days, and for starry skies, higher requirements are placed on the light input of the lens. At the same time, to ensure the high imaging quality of the optical lens, more lens elements are required to achieve this, which will inevitably bring more difficulties to the miniaturized design of the lens. Therefore, to meet this trend, through the reasonable combination design of the optical power of seven lenses, the surface shapes of each lens, the central thickness of each lens, etc., the present invention can realize a lens composed of seven lenses with high-pixel imaging quality, a larger light input, and the characteristics of being thin, light, and small in volume. Summary of the Invention

[0003] In view of this, the present invention provides a seven-piece optical imaging system, which has high imaging quality, a large light input, and a small volume.

[0004] It is also necessary to provide an image capturing device using the above optical imaging system.

[0005] In addition, it is necessary to provide an electronic device using the above image capturing device.

[0006] An optical imaging system sequentially includes, from the object side to the image side:

[0007] A first lens with positive optical power;

[0008] A second lens with negative optical power;

[0009] A third lens with optical power;

[0010] A fourth lens with positive optical power;

[0011] A fifth lens with optical power;

[0012] A sixth lens with positive optical power; and

[0013] A seventh lens with negative optical power;

[0014] Among them, the optical imaging system satisfies the following relational expressions:

[0015] 1.0 < f12 / f < 2.0;

[0016] f / EPD ≤ 1.8;

[0017] Among them, f12 is the combined focal length of the first lens and the second lens, f is the total effective focal length of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging system.

[0018] For the optical imaging system 100 of the present invention, f12 / f is greater than 1.0 and less than 2.0, which is beneficial to enhancing the light focusing ability of the optical imaging system 100. At the same time, the first lens has a positive optical power and the second lens has a negative optical power, which can ensure the balance of spherical aberration of the optical imaging system, achieve good imaging quality, is beneficial to shortening the overall length of the system, and can also obtain a larger field of view angle. At the same time, f / EPD ≤ 1.8, enabling the optical imaging system 100 to have a large aperture, which can increase the light flux per unit time and enhance the imaging effect in a dark environment.

[0019] Among them, the object side and the image side of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are all aspherical surfaces, and at least one inflection point is provided on at least one of the object side and the image side of the sixth lens. Using aspherical lenses for each lens is beneficial to converging light and imaging. It can be easily made into a shape other than a spherical surface, obtaining more control variables, having the advantage of achieving good imaging with a smaller number of lenses, thereby reducing the number of lenses and meeting the miniaturization requirement. The inflection point can be used to correct the off-axis field aberration, suppress the incident angle of light to the imaging surface, and can more accurately match the photosensitive element.

[0020] Among them, the object side near the optical axis and at the circumference of the first lens is convex, and the image side near the optical axis and at the circumference is concave. The object side of the first lens is convex near the optical axis, which can enhance the positive optical power of the first lens that undertakes the main imaging function of the optical imaging system, and is beneficial to ultra-thinning.

[0021] Among them, the object side near the optical axis and at the circumference of the second lens is convex, and the image side near the optical axis and at the circumference is concave. The concave image side of the second lens can better correct spherical aberration.

[0022] Among them, the object side near the optical axis of the third lens is convex; the image side near the optical axis and at the circumference is concave.

[0023] Among them, the circumference of the object side of the fourth lens is concave; the circumference of the image side is convex. This can effectively reduce the field curvature and distortion of the system and improve the imaging quality

[0024] Wherein, the object side of the fifth lens is concave both near the optical axis and at the circumference; the image side is convex near the optical axis and concave at the circumference.

[0025] Wherein, the object side of the sixth lens is convex near the optical axis and concave at the circumference; the image side is concave near the optical axis.

[0026] Wherein, the object side of the seventh lens is convex near the optical axis; the image side is concave near the optical axis and convex at the circumference.

[0027] Wherein, the optical imaging system further includes an infrared filter, which is located between the seventh lens and the imaging surface. The infrared filter can filter out light in the infrared band, reduce some ghost image stray light, and can also play a certain protective role for the photosensitive element.

[0028] Wherein, the optical imaging system satisfies the following conditional formula:

[0029] 2.6 < f4 / f1 < 6.5;

[0030] Wherein, f1 is the effective focal length of the first lens, and f4 is the effective focal length of the fourth lens.

[0031] By reasonably configuring the ratio of the fourth lens to the first lens, the spherical aberration of the optical imaging system can be effectively corrected, and at the same time, it is beneficial to compress the total length of the optical imaging system and achieve the characteristic of being thin.

[0032] Wherein, the optical imaging system satisfies the following conditional formula:

[0033] -25 < f2 / f1 + f6 / f7 < -1;

[0034] Wherein, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

[0035] By reasonably balancing the relationship between the optical powers of the first lens and the second lens and between the sixth lens and the seventh lens, the optical total length of the optical imaging system can be effectively shortened, and at the same time, it can be ensured that the positive and negative spherical aberrations of the optical imaging system are balanced with each other, thereby achieving an improvement in imaging quality.

[0036] Wherein, the optical imaging system satisfies the following conditional formula:

[0037] 0.5 < f / f1 < 1.5;

[0038] Wherein, f is the total effective focal length of the optical imaging system, and f1 is the effective focal length of the first lens.

[0039] By reasonably configuring the total effective focal length of the optical imaging system, the optical imaging system can have a better ability to balance the field area.

[0040] Among them, the optical imaging system satisfies the following conditional formula:

[0041] TTL / ImgH < 1.6;

[0042] Among them, TTL is the distance from the object side surface of the first lens to the imaging surface of the optical imaging system, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

[0043] When TTL / ImgH < 1.6, high-quality imaging effects on a large image surface can be satisfied, and at the same time, the total length of the optical imaging system can be effectively reduced, thereby realizing the ultra-thin and miniaturization of the optical imaging system.

[0044] Among them, the optical imaging system satisfies the following conditional formula:

[0045] 2.0 < (R4 + R5) / (R4 - R5) < 5.0;

[0046] Among them, R4 is the curvature radius of the object side surface of the second lens, and R5 is the curvature radius of the image side surface of the second lens.

[0047] By reasonably restricting the curvature radii of the object side surface and the image side surface of the second lens, the optical deflection angle borne by the second lens can be effectively distributed, and at the same time, the off-axis field astigmatism can be improved, and the imaging quality of the optical imaging system can be improved.

[0048] Among them, the optical imaging system satisfies the following conditional formula:

[0049] 0.6 < R6 / R7 < 1.8;

[0050] Among them, R6 is the curvature radius of the object side surface of the third lens, and R7 is the curvature radius of the image side surface of the third lens.

[0051] When 0.6 < R6 / R7 < 1.8, the curvature radius of the object side surface of the third lens and the curvature radius of the image side surface of the third lens can be appropriately configured, the optical power can be controlled not to increase excessively, while correcting the astigmatism aberration of the optical imaging system, the sensitivity of the optical imaging system can be reduced, which is beneficial to improving the product yield.

[0052] Among them, the optical imaging system satisfies the following conditional formula:

[0053] 3.1 < ∑CT < 4.5;

[0054] Among them, ∑CT is the sum of the thicknesses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens on the optical axis.

[0055] When 3.1 < ∑CT < 4.5, the central thicknesses of the respective lenses are reasonably configured so that the structure between the lenses is compact, which is beneficial to the thinning of the optical imaging system. At the same time, the optical imaging system has a good ability to correct distortion, thereby improving the imaging quality.

[0056] Among them, the optical imaging system satisfies the following conditional formula:

[0057] 0.6 < T34 / T23 < 2.0;

[0058] Among them, T23 is the distance on the optical axis from the image side of the second lens to the object side of the third lens, and T34 is the distance on the optical axis from the image side of the third lens to the object side of the fourth lens.

[0059] By reasonably configuring the distance on the optical axis between the image side of the second lens and the object side of the third lens and the distance on the optical axis between the image side of the third lens and the object side of the fourth lens, the size of the optical imaging system can be effectively compressed, thereby ensuring the ultra-thinning of the optical imaging system.

[0060] Among them, the optical imaging system satisfies the following conditional formula:

[0061] 0.1 < f4 / f6 < 2.0;

[0062] Among them, f4 is the effective focal length of the fourth lens, and f6 is the effective focal length of the sixth lens.

[0063] The positive optical power of the fourth lens and the sixth lens can balance the negative spherical aberration generated by other negative optical power lenses, reduce the tolerance sensitivity of the optical imaging system, and improve the imaging quality of the system. When f4 / f6 ≤ 0.1, the sixth lens needs to provide most of the positive optical power, resulting in excessive bending of the object side of the sixth lens, poor molding, and affecting the manufacturing yield. When f4 / f6 ≥ 2, the optical power distribution between the fourth lens and the sixth lens is unbalanced, resulting in excessive aberrations in the optical imaging system and difficulty in correction.

[0064] Among them, the optical imaging system satisfies the following conditional formula:

[0065] 2.1 < |f7| / R15 < 5.5;

[0066] Among them, f7 is the effective focal length of the seventh lens, and R15 is the radius of curvature of the image side of the seventh lens.

[0067] Reasonably configuring the relationship between the effective focal length of the seventh lens and the curvature radius of the image side of the seventh lens can reduce the incident angle of light entering the photosensitive element, thereby ensuring that the optical imaging system can be more easily matched with common photosensitive elements.

[0068] Among them, the optical imaging system satisfies the following conditional formula:

[0069] 0.5 < CT5 / |SAG51| < 1.5;

[0070] Among them, CT5 is the thickness of the fifth lens on the optical axis, and Sag51 is the horizontal displacement of 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 in the optical axis direction.

[0071] When 0.5 < CT5 / |SAG51| < 1.5, the manufacturing and molding of the fifth lens are made easier, and the yield of the fifth lens is improved. At the same time, the field area generated by the previous four lenses can be corrected to ensure the balance of the field area of the optical imaging system and improve the imaging quality of the optical imaging system.

[0072] Among them, the optical imaging system satisfies the following conditional formula:

[0073] 0 < vd6 - vd3 < 40;

[0074] Among them, vd3 is the Abbe number of the third lens, and vd6 is the Abbe number of the sixth lens.

[0075] Reasonably selecting the materials of the third lens and the sixth lens can effectively correct the chromatic aberration of the optical imaging system, improve the imaging clarity of the optical imaging system, and thus improve the imaging quality of the optical imaging system.

[0076] The present invention also provides an imaging device, which includes:

[0077] The above-mentioned optical imaging system; and

[0078] A photosensitive element, which is located on the image side of the optical imaging system.

[0079] The present invention also provides an electronic device, which includes:

[0080] The device body and;

[0081] The above-mentioned imaging device, and the imaging device is installed on the device body.

[0082] Thus, the present invention adopts a seven-piece optical imaging system. Through the design of the optical power, surface shape, and central thickness of each of the seven lenses, it has a high pixel count, a large light input, and a small volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] To more clearly illustrate the structural features and functions of the present invention, the following will provide a detailed description thereof in conjunction with the accompanying drawings and specific embodiments.

[0084] Figure 1-1 It is a schematic structural diagram of the optical imaging system according to the first embodiment of the present invention.

[0085] Figure 1-2 From left to right are the spherical aberration, astigmatism, and distortion curves of the optical imaging system according to the first embodiment of the present invention.

[0086] Figure 2-1 It is a schematic structural diagram of the optical imaging system according to the second embodiment of the present invention.

[0087] Figure 2-2 From left to right are the spherical aberration, astigmatism, and distortion curves of the optical imaging system according to the second embodiment of the present invention.

[0088] Figure 3-1 It is a schematic structural diagram of the optical imaging system according to the third embodiment of the present invention.

[0089] Figure 3-2 From left to right are the spherical aberration, astigmatism, and distortion curves of the optical imaging system according to the third embodiment of the present invention.

[0090] Figure 4-1 It is a schematic structural diagram of the optical imaging system according to the fourth embodiment of the present invention.

[0091] Figure 4-2 From left to right are the spherical aberration, astigmatism, and distortion curves of the optical imaging system according to the fourth embodiment of the present invention.

[0092] Figure 5-1 It is a schematic structural diagram of the optical imaging system according to the fifth embodiment of the present invention.

[0093] Figure 5-2 From left to right are the spherical aberration, astigmatism, and distortion curves of the optical imaging system according to the fifth embodiment of the present invention.

[0094] Figure 6-1 It is a schematic structural diagram of the optical imaging system according to the sixth embodiment of the present invention.

[0095] Figure 6-2 From left to right are the spherical aberration, astigmatism, and distortion curves of the optical imaging system according to the sixth embodiment of the present invention.

[0096] Figure 7-1 It is a schematic structural diagram of the optical imaging system according to the seventh embodiment of the present invention.

[0097] Figure 7-2 From left to right are the spherical aberration, astigmatism, and distortion curves of the optical imaging system according to the seventh embodiment of the present invention.

[0098] Figure 8-1 It is a schematic structural diagram of the optical imaging system according to the eighth embodiment of the present invention.

[0099] Figure 8-2 From left to right are the spherical aberration, astigmatism, and distortion curves of the optical imaging system according to the eighth embodiment of the present invention.

[0100] Figure 9 Schematic structural diagram of the image pickup device according to the embodiment of the present invention.

[0101] Figure 10 Schematic structural diagram of the electronic device according to the embodiment of the present invention. Specific embodiments

[0102] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0103] Please refer to Figure 1-1 , Figure 2-1 , Figure 3-1 , Figure 4-1 , Figure 5-1 , Figure 6-1 , Figure 7-1 and Figure 8-1 , the optical imaging system 100 according to the embodiment of the present invention is applied to a lens, which sequentially includes a first lens L1 with a positive optical power, a second lens L2 with a negative optical power, a third lens L3 with an optical power, a fourth lens L4 with a positive optical power, a fifth lens L5 with an optical power, a sixth lens L6 with a positive optical power, and a seventh lens L7 with a negative optical power from the object side to the image side. The optical imaging system satisfies the following relational expressions:

[0104] 1.0 < f12 / f < 2.0;

[0105] f / EPD ≤ 1.8;

[0106] wherein, f12 is the combined focal length of the first lens L1 and the second lens L2, f is the total effective focal length of the optical imaging system 100, and EPD is the entrance pupil diameter of the optical imaging system 100.

[0107] For the optical imaging system 100 of the present invention, f12 / f is greater than 1.0 and less than 2.0, which is beneficial to enhancing the light focusing ability of the optical imaging system 100. At the same time, the first lens has a positive optical power and the second lens has a negative optical power, which can ensure the balance of spherical aberration of the optical imaging system, achieve good imaging quality, is beneficial to shortening the overall length of the system, and can also obtain a larger field of view angle. At the same time, f / EPD≤1.8, which enables the optical imaging system 100 to have a large aperture, can increase the light flux per unit time, and enhance the imaging effect in a dark environment.

[0108] Optionally, the first lens L1 is made of plastic and has an object side S1 and an image side S2. Both the object side S1 and the image side S2 are aspherical surfaces. The object side S1 is convex both near the optical axis and at the circumference. The image side S2 is concave both near the optical axis and at the circumference. The first lens L1 being an aspherical lens is beneficial for converging light and imaging. It can be easily formed into a shape other than a spherical surface, obtaining more control variables, having the advantage of achieving good imaging with a smaller number of lenses, thereby reducing the number of lenses and meeting the miniaturization requirement.

[0109] Optionally, the second lens L2 is made of plastic and has an object side S3 and an image side S4. Both the object side S3 and the image side S4 are aspherical surfaces. The object side S3 is convex both near the optical axis and at the circumference. The image side S4 is concave both near the optical axis and at the circumference. The second lens L2 being an aspherical lens can be easily formed into a shape other than a spherical surface, obtaining more control variables, which is beneficial for reducing aberration, having the advantage of achieving good imaging with a smaller number of lenses; thereby reducing the number of lenses and meeting the miniaturization requirement. The concave image side S4 of the second lens L2 can better correct spherical aberration.

[0110] Optionally, the third lens L3 is made of plastic and has an object side S5 and an image side S6. Both the object side S5 and the image side S6 are aspherical surfaces. The object side S5 is convex near the optical axis, and can be convex or concave at the circumference. The image side S6 is concave both near the optical axis and at the circumference. The third lens L3 can have a positive optical power or a negative optical power. The third lens L3 can effectively reduce the field curvature and distortion of the system and improve the imaging quality. The third lens being an aspherical lens can be easily formed into a shape other than a spherical surface, obtaining more control variables, which is beneficial for reducing aberration, having the advantage of achieving good imaging with a smaller number of lenses; thereby reducing the number of lenses and meeting the miniaturization requirement.

[0111] Optionally, the fourth lens L4 is made of plastic and has an object side S7 and an image side S8. Both the object side S7 and the image side S8 are aspherical surfaces. The object side S7 may be convex or concave near the optical axis and concave at the circumference. The image side S8 may be convex or concave near the optical axis and convex at the circumference. The aspherical lens can be easily formed into a shape other than a spherical shape, obtaining more control variables, which is beneficial to reducing aberration and achieving good imaging with a smaller number of lenses; thereby reducing the number of lenses and meeting the miniaturization requirement.

[0112] Optionally, the fifth lens L5 is made of plastic and has an object side S9 and an image side S10. Both the object side S9 and the image side S10 are aspherical surfaces. The object side S9 is concave both near the optical axis and at the circumference. The image side S10 is convex near the optical axis and concave at the circumference. The fifth lens L5 may have a positive optical power or a negative optical power. The aspherical lens can be easily formed into a shape other than a spherical shape, obtaining more control variables, which is beneficial to reducing aberration and achieving good imaging with a smaller number of lenses; thereby reducing the number of lenses and meeting the miniaturization requirement.

[0113] Optionally, the sixth lens L6 is made of plastic and has an object side S11 and an image side S12. Both the object side S11 and the image side S12 are aspherical surfaces. The object side S11 is convex near the optical axis and concave at the circumference. The image side S12 is concave near the optical axis and may be convex or concave at the circumference. The aspherical lens can be easily formed into a shape other than a spherical shape, obtaining more control variables, which is beneficial to reducing aberration and achieving good imaging with a smaller number of lenses; thereby reducing the number of lenses and meeting the miniaturization requirement.

[0114] In some embodiments, at least one inflection point is provided on at least one of the object side S11 and the image side S12. The "inflection point" refers to the inflection point where the radius of curvature changes from positive to negative or from negative to positive. The inflection point can be used to correct the aberration of the off-axis field of view, suppress the incident angle of light to the imaging surface, and more accurately match the photosensitive element.

[0115] Optionally, the seventh lens L7 is made of plastic and has an object side S13 and an image side S14. Both the object side S13 and the image side S14 are aspherical surfaces. The object side S13 is convex near the optical axis, and can be convex or concave at the circumference. The image side S14 is concave near the optical axis and convex at the circumference. The aspherical lens can be easily formed into a shape other than a spherical surface, obtaining more control variables, which is beneficial to reducing aberration and achieving good imaging with a smaller number of lenses; furthermore, the number of lenses is reduced to meet the miniaturization requirement. Optionally, the optical imaging system 100 further includes a diaphragm 10, and the diaphragm 10 is located on the object side of the first lens L1. Specifically, the diaphragm 10 can be located above the object side S2; it can also be disposed between the object surface and the object side S2, that is, the diaphragm 10 does not directly contact the object side S2. When the diaphragm 10 is disposed on the object side of the first lens L1, the optical imaging system 100 can have a telecentric effect, increasing the efficiency of the photosensitive element in receiving the image.

[0116] Optionally, the optical imaging system 100 further includes an infrared filter 30. The infrared filter has a first surface 31 and a second surface 32. The infrared filter 30 is made of glass and is located between the seventh lens L7 and the imaging surface 50. The infrared filter 30 can filter out the light in the infrared band, reducing some ghost image stray light, and can also play a certain protective role for the photosensitive element.

[0117] In some embodiments, the optical imaging system 100 satisfies the following conditional formula:

[0118] 2.6 < f4 / f1 < 6.5;

[0119] Wherein, f1 is the effective focal length of the first lens L1, and f4 is the effective focal length of the fourth lens L4.

[0120] That is to say, f4 / f1 can be any value between 2.6 and 6.5. For example, the value of f4 / f1 can be 2.7, 2.9, 3.0, 4.0, 5.0, 6.0, 6.4, etc.

[0121] By reasonably configuring the ratio of the fourth lens L4 to the first lens L1, the spherical aberration of the optical imaging system 100 can be effectively corrected, and at the same time, it is beneficial to compress the total length of the optical imaging system 100, realizing the thin-type characteristic.

[0122] In some embodiments, the optical imaging system 100 satisfies the following conditional formula:

[0123] -25 < f2 / f1 + f6 / f7 < -1;

[0124] Wherein, f1 is the effective focal length of the first lens L1, f2 is the effective focal length of the second lens L2, f6 is the effective focal length of the sixth lens L6, and f7 is the effective focal length of the seventh lens L7.

[0125] That is, f2 / f1 + f6 / f7 can be any value between -25 and -1, such as -24, -20, -18, -15, -12, -10, -8, -6, -1.5, etc.

[0126] By reasonably balancing the relationship between the optical powers of the first lens L1, the second lens L2, the sixth lens L6, and the seventh lens L7, the overall optical length of the optical imaging system can be effectively shortened, and the positive and negative spherical aberrations of the optical imaging system can be balanced simultaneously, thereby improving the imaging quality.

[0127] In some embodiments, the optical imaging system 100 satisfies the following conditional expression:

[0128] 0.5 < f / f1 < 1.5;

[0129] Where f is the total effective focal length of the optical imaging system 100, and f1 is the effective focal length of the first lens L1.

[0130] That is, f / f1 can be any value between 0.5 and 1.5, such as 0.6, 0.8, 1.0, 1.2, 1.4, etc.

[0131] By reasonably configuring the total effective focal length f of the optical imaging system 100, the optical imaging system 100 can have a better ability to balance the field.

[0132] In some embodiments, the optical imaging system 100 satisfies the following conditional expression:

[0133] TTL / ImgH < 1.6;

[0134] Where TTL is the distance from the object side surface S1 of the first lens L1 to the imaging surface 50 of the optical imaging system, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

[0135] That is, TTL / ImgH can be any value less than 1.6, such as 0.1, 0.5, 0.6, 0.8, 1.0, 1.2, 1.5, etc.

[0136] When TTL / ImgH < 1.6, high-quality imaging effects on a large imaging surface can be satisfied, and at the same time, the total length of the optical imaging system 100 can be effectively reduced, thereby realizing the ultra-thin and miniaturization of the optical imaging system 100.

[0137] In some embodiments, the optical imaging system 100 satisfies the following conditional expression:

[0138] 2.0 < (R4 + R5) / (R4 - R5) < 5.0;

[0139] Among them, R4 is the curvature radius of the object side surface S3 of the second lens, and R5 is the curvature radius of the image side surface S4 of the second lens.

[0140] That is to say, (R4 + R5) / (R4 - R5) can be any value between 2.0 and 5.0, such as 2.1, 2.5, 3.0, 4.0, 4.8, etc.

[0141] By reasonably constraining the curvature radii of the object side surface S3 and the image side surface S4 of the second lens L2, the optical deflection angle borne by the second lens L2 can be effectively distributed, while the astigmatism of the off-axis field of view is improved, and the imaging quality of the optical imaging system 100 is enhanced.

[0142] In some embodiments, the optical imaging system 100 satisfies the following conditional formula:

[0143] 0.6 < R6 / R7 < 1.8;

[0144] Among them, R6 is the curvature radius of the object side surface S5 of the third lens, and R7 is the curvature radius of the image side surface S6 of the third lens.

[0145] That is to say, R6 / R7 can be any value between 0.6 and 1.8, such as 0.7, 0.8, 1.0, 1.2, 1.5, 1.7, etc.

[0146] When 0.6 < R6 / R7 < 1.8, the curvature radius of the object side surface S5 of the third lens and the curvature radius of the image side surface S6 of the third lens can be properly configured, the optical power can be controlled not to increase excessively, while correcting the astigmatism aberration of the optical imaging system 100, the sensitivity of the optical imaging system 100 can be reduced, which is beneficial to improving the product yield.

[0147] In some embodiments, the optical imaging system 100 satisfies the following conditional formula:

[0148] 3.1 < ∑CT < 4.5;

[0149] Among them, ∑CT is the sum of the thicknesses of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 on the optical axis.

[0150] That is to say, ∑CT can be any value between 3.1 and 4.5, such as 3.2, 3.5, 3.6, 3.8, 3.9, etc.

[0151] When 3.1 < ∑CT < 4.5, the center thicknesses of the respective lenses are reasonably configured so that the structure between the lenses is compact, which is beneficial to the thinning of the optical imaging system 100. At the same time, the optical imaging system 100 has a good ability to correct distortion, thereby improving the imaging quality.

[0152] In some embodiments, the optical imaging system 100 satisfies the following conditional formula:

[0153] 0.6 < T34 / T23 < 2.0;

[0154] Wherein, T23 is the distance on the optical axis from the image side surface of the second lens to the object side surface of the third lens, and T34 is the distance on the optical axis from the image side surface of the third lens to the object side surface of the fourth lens.

[0155] That is to say, T34 / T23 can be any value between 0.6 and 2.0, such as 0.7, 1.0, 1.2, 1.5, 1.9, etc.

[0156] Reasonably configuring the distance on the optical axis between the image side surface of the second lens L2 and the object side surface of the third lens L3 and the distance on the optical axis between the image side surface of the third lens L3 and the object side surface of the fourth lens L4 can effectively compress the size of the optical imaging system 100, thereby ensuring the ultra-thinning of the optical imaging system 100.

[0157] In some embodiments, the optical imaging system 100 satisfies the following conditional formula:

[0158] 0.1 < f4 / f6 < 2.0;

[0159] Wherein, f4 is the effective focal length of the fourth lens, and f6 is the effective focal length of the sixth lens.

[0160] That is to say, f4 / f6 can be any value between 0.1 and 2.0, such as 0.2, 0.7, 1.0, 1.2, 1.5, 1.9, etc.

[0161] The positive optical power of the fourth lens L4 and the sixth lens L6 can balance the negative spherical aberration generated by other negative optical power lenses, reduce the tolerance sensitivity of the optical imaging system 100, and improve the imaging quality of the system. When f4 / f6 ≤ 0.1, the sixth lens L6 needs to provide most of the positive optical power, resulting in excessive bending of the object side surface S12 of the sixth lens L6, poor molding, and affecting the manufacturing yield. When f4 / f6 ≥ 2, the optical power distribution between the fourth lens L4 and the sixth lens L6 is unbalanced, resulting in excessive aberration of the optical imaging system 100 and difficult correction.

[0162] In some embodiments, the optical imaging system 100 satisfies the following conditional formula:

[0163] 2.1 < |f7| / R15 < 5.5;

[0164] Wherein, f7 is the effective focal length of the seventh lens L7, and R15 is the radius of curvature of the image side S14 of the seventh lens L7.

[0165] That is to say, |f7| / R15 can be any value between 2.1 and 5.5, such as 2.2, 2.5, 3.0, 4.2, 5.0, 5.4, etc.

[0166] By reasonably configuring the relationship between the effective focal length of the seventh lens L7 and the radius of curvature of the image side S14 of the seventh lens L7, the incident angle of light entering the photosensitive element can be reduced, thereby ensuring that the optical imaging system 100 can be more easily matched with a common photosensitive element.

[0167] In some embodiments, the optical imaging system 100 satisfies the following conditional formula:

[0168] 0.5 < CT5 / |SAG51| < 1.5;

[0169] Wherein, CT5 is the thickness of the fifth lens L5 on the optical axis, and Sag51 is the horizontal displacement of the intersection of the object side S9 of the fifth lens L5 and the optical axis to the maximum effective radius of the object side S9 of the fifth lens L5 in the optical axis direction. The horizontal displacement is defined as positive towards the image side direction and negative towards the object side.

[0170] That is to say, CT5 / |SAG51| can be any value between 0.5 and 1.5, such as 0.6, 0.7, 0.8, 1.2, 1.4, etc.

[0171] When 0.5 < CT5 / |SAG51| < 1.5, the manufacturing and forming of the fifth lens L5 are made easier, and the yield rate of the fifth lens L5 is improved. At the same time, the field area generated by the previous four lenses can be corrected, ensuring the balance of the field area of the optical imaging system 100 and improving the imaging quality of the optical imaging system 100.

[0172] In some embodiments, the optical imaging system 100 satisfies the following conditional formula:

[0173] 0 < vd6 - vd3 < 40;

[0174] Wherein, vd3 is the Abbe number of the third lens L3, and vd6 is the Abbe number of the sixth lens L6.

[0175] That is to say, vd6 - vd3 can be any value between 0 and 40, such as 1, 5, 10, 15, 20, 30, 35, 39, etc.

[0176] Reasonably selecting the materials of the third lens L3 and the sixth lens L6 can effectively correct the chromatic aberration of the optical imaging system 100, improve the imaging clarity of the optical imaging system 100, and thus enhance the imaging quality of the optical imaging system 100.

[0177] The following further describes the optical imaging system 100 of the present invention in detail with specific embodiments.

[0178] First Embodiment

[0179] Please refer to Figure 1-1 and Figure 1-2 where Figure 1-1 is a schematic structural diagram of the optical imaging system 100 of the first embodiment, Figure 1-2 from left to right are the spherical aberration, astigmatism, and distortion curves of the first embodiment of the present invention. It can be seen from Figure 1-1 that the optical imaging system 100 of this embodiment includes, in sequence from the object side to the image side, a diaphragm 10, a first lens L1 with a positive optical power, a second lens L2 with a negative optical power, a third lens L3 with a positive optical power, a fourth lens L4 with a positive optical power, a fifth lens L5 with a positive optical power, a sixth lens L6 with a positive optical power, a seventh lens L7 with a negative optical power, an infrared filter 30, and an imaging surface 50.

[0180] The first lens L1 is made of plastic, and its object side surface S1 and image side surface S2 are both aspherical surfaces. The object side surface S1 is convex both near the optical axis and at the circumference. The image side surface S2 is concave both near the optical axis and at the circumference.

[0181] The second lens L2 is made of plastic, and its object side surface S3 and image side surface S4 are both aspherical surfaces. The object side surface S3 is convex both near the optical axis and at the circumference. The image side surface S4 is concave both near the optical axis and at the circumference.

[0182] The third lens L3 is made of plastic, and its object side surface S5 and image side surface S6 are both aspherical surfaces. The object side surface S5 is convex near the optical axis and concave at the circumference. The image side surface S6 is concave both near the optical axis and at the circumference.

[0183] The fourth lens L4 is made of plastic, and its object side surface S7 and image side surface S8 are both aspherical surfaces. The object side surface S7 is convex near the optical axis and concave at the circumference. The image side surface S8 is convex both near the optical axis and at the circumference.

[0184] The fifth lens L5 is made of plastic, and its object side surface S9 and image side surface S10 are both aspherical surfaces. The object side surface S9 is concave both near the optical axis and at the circumference. The image side surface S10 is convex near the optical axis and concave at the circumference.

[0185] The sixth lens L6 is made of plastic, and its object side S11 and image side S12 are both aspherical surfaces. The object side S11 is convex near the optical axis and concave at the circumference. The image side S12 is concave near the optical axis and convex at the circumference.

[0186] The seventh lens L7 is made of plastic, and its object side S13 and image side S14 are both aspherical surfaces. The object side S13 is convex both near the optical axis and at the circumference. The image side S14 is concave near the optical axis and convex at the circumference.

[0187] In this embodiment, f12 = 7.5, f = 4.67, f12 / f = 1.606; EPD = 3.162, f / EPD = 1.48; f4 = 23.83, f1 = 4.56, f4 / f1 = 5.23; f2 = -9.08, f6 = 21.14, f7 = -6.25, f2 / f1 + f6 / f7 = -5.37; f / f1 = 1.024; TTL = 5.79, ImgH = 4.18, TTL / ImgH = 1.39; R4 = 8.223, R5 = 3.479, (R4 + R5) / (R4 - R5) = 2.47; R6 = 3.367, R7 = 3.99, R6 / R7 = 0.844; CT1 = 0.931, CT2 = 0.23, CT3 = 0.248, CT4 = 0.519, CT5 = 0.446, CT6 = 0.504, CT7 = 0.448, CT1 + CT2 + CT3 + CT4 + CT5 + CT6 + CT7 = 3.326; T34 = 0.303, T23 = 0.211, T34 / T23 = 1.436; f4 / f6 = 1.127; R15 = 1.593, |f7| / R15 = 3.92; SAG51 = -0.473, CT5 / |SAG51| = 0.943; vd6 = 23.54, vd3 = 20.37, vd6 - vd3 = 3.17.

[0188] In this embodiment, the optical imaging system 100 satisfies the conditions in Table 1 and Table 2 below.

[0189]

[0190]

[0191] Table 2 shows the aspherical data of the first embodiment, where k is the conic coefficient of each surface, and A4 - A20 are the 4th - 20th order aspherical coefficients of each surface.

[0192] From Figure 1-2 it can be seen that under the condition of meeting miniaturization, the optical imaging system 100 of the present invention has a high pixel count.

[0193] Second Embodiment

[0194] Please refer to Figure 2-1 and Figure 2-2 , where Figure 2-1 is a schematic structural diagram of the optical imaging system 100 of the second embodiment, Figure 2-2 from left to right are the spherical aberration, astigmatism, and distortion curves of the second embodiment of the present invention. It can be seen from Figure 2-1 that the optical imaging system 100 of this embodiment sequentially includes a diaphragm 10, a first lens L1 with positive optical power, a second lens L2 with negative optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with positive optical power, a sixth lens L6 with positive optical power, a seventh lens L7 with negative optical power, an infrared filter 30, and an imaging surface 50 from the object side to the image side.

[0195] The first lens L1 is made of plastic, and its object side surface S1 and image side surface S2 are both aspherical surfaces. The object side surface S1 is convex both near the optical axis and at the circumference. The image side surface S2 is concave both near the optical axis and at the circumference.

[0196] The second lens L2 is made of plastic, and its object side surface S3 and image side surface S4 are both aspherical surfaces. The object side surface S3 is convex both near the optical axis and at the circumference. The image side surface S4 is concave both near the optical axis and at the circumference.

[0197] The third lens L3 is made of plastic, and its object side surface S5 and image side surface S6 are both aspherical surfaces. The object side surface S5 is convex near the optical axis and concave at the circumference. The image side surface S6 is concave both near the optical axis and at the circumference.

[0198] The fourth lens L4 is made of plastic, and its object side surface S7 and image side surface S8 are both aspherical surfaces. The object side surface S7 is convex near the optical axis and concave at the circumference. The image side surface S8 is convex both near the optical axis and at the circumference.

[0199] The fifth lens L5 is made of plastic, and its object side surface S9 and image side surface S10 are both aspherical surfaces. The object side surface S9 is concave both near the optical axis and at the circumference. The image side surface S10 is convex near the optical axis and concave at the circumference.

[0200] The sixth lens L6 is made of plastic, and its object side surface S11 and image side surface S12 are both aspherical surfaces. The object side surface S11 is convex near the optical axis and concave at the circumference. The image side surface S12 is concave near the optical axis and convex at the circumference.

[0201] The seventh lens L7 is made of plastic, and its object side surface S13 and image side surface S14 are both aspherical surfaces. The object side surface S13 is convex both near the optical axis and at the circumference. The image side surface S14 is concave near the optical axis and convex at the circumference.

[0202] In this embodiment, f12 = 6.37, f = 4.66, f12 / f = 1.367; EPD = 3.153, f / EPD = 1.48; f4 = 20.23, f1 = 4.58, f4 / f1 = 4.42; f2 = -12.45, f6 = 26.74, f7 = -6.14, f2 / f1 + f6 / f7 = -7.07; f / f1 = 1.017; TTL = 5.79, ImgH = 4.18, TTL / ImgH = 1.39; R4 = 6.473, R5 = 3.609, (R4 + R5) / (R4 - R5) = 3.52; R6 = 4.909, R7 = 4.66, R6 / R7 = 1.053; CT1 = 0.931, CT2 = 0.235, CT3 = 0.235, CT4 = 0.491, CT5 = 0.498, CT6 = 0.457, CT7 = 0.458, CT1 + CT2 + CT3 + CT4 + CT5 + CT6 + CT7 = 3.305; T34 = 0.257, T23 = 0.25, T34 / T23 = 1.028; f4 / f6 = 0.757; R15 = 1.627, |f7| / R15 = 3.77; SAG51 = -0.451, CT5 / |SAG51| = 1.104; vd6 = 23.54, vd3 = 20.4, vd6 - vd3 = 3.14.

[0203] In this embodiment, the optical imaging system 100 satisfies the conditions in Table 3 and Table 4 below.

[0204]

[0205]

[0206] Table 4 shows the aspheric data of the second embodiment, where k is the conic coefficient of each surface, and A4 - A20 are the 4th - 20th order aspheric coefficients of each surface.

[0207] It can be seen that Figure 2-2 under the condition of meeting miniaturization, the optical imaging system 100 of the present invention has a high pixel count.

[0208] Third Embodiment

[0209] Please refer to Figure 3-1 and Figure 3-2 where Figure 3-1 is a schematic structural diagram of the optical imaging system 100 of the third embodiment of the present invention, Figure 3-2 from left to right are the spherical aberration, astigmatism, and distortion curves of the third embodiment of the present invention. It can be seen from Figure 3-1It can be known that the optical imaging system 100 of this embodiment sequentially includes a diaphragm 10, a first lens L1 with a positive optical power, a second lens L2 with a negative optical power, a third lens L3 with a negative optical power, a fourth lens L4 with a positive optical power, a fifth lens L5 with a positive optical power, a sixth lens L6 with a positive optical power, a seventh lens L7 with a negative optical power, an infrared filter 30, and an imaging surface 50 from the object side to the image side.

[0210] The first lens L1 is made of plastic, and its object side surface S1 and image side surface S2 are both aspherical surfaces. The object side surface S1 is convex both near the optical axis and at the circumference. The image side surface S2 is concave both near the optical axis and at the circumference.

[0211] The second lens L2 is made of plastic, and its object side surface S3 and image side surface S4 are both aspherical surfaces. The object side surface S3 is convex both near the optical axis and at the circumference. The image side surface S4 is concave both near the optical axis and at the circumference.

[0212] The third lens L3 is made of plastic, and its object side surface S5 and image side surface S6 are both aspherical surfaces. The object side surface S5 is convex near the optical axis and concave at the circumference. The image side surface S6 is concave both near the optical axis and at the circumference.

[0213] The fourth lens L4 is made of plastic, and its object side surface S7 and image side surface S8 are both aspherical surfaces. The object side surface S7 is convex near the optical axis and concave at the circumference. The image side surface S8 is convex both near the optical axis and at the circumference.

[0214] The fifth lens L5 is made of plastic, and its object side surface S9 and image side surface S10 are both aspherical surfaces. The object side surface S9 is concave both near the optical axis and at the circumference. The image side surface S10 is convex near the optical axis and concave at the circumference.

[0215] The sixth lens L6 is made of plastic, and its object side surface S11 and image side surface S12 are both aspherical surfaces. The object side surface S11 is convex near the optical axis and concave at the circumference. The image side surface S12 is concave near the optical axis and convex at the circumference.

[0216] The seventh lens L7 is made of plastic, and its object side surface S13 and image side surface S14 are both aspherical surfaces. The object side surface S13 is convex both near the optical axis and at the circumference. The image side surface S14 is concave near the optical axis and convex at the circumference.

[0217] In this embodiment, f12 = 6.2, f = 4.64, f12 / f = 1.336; EPD = 3.093, f / EPD = 1.50; f4 = 17.65, f1 = 4.65, f4 / f1 = 3.82; f2 = -14.16, f6 = 24.69, f7 = -6.24, f2 / f1 + f6 / f7 = -7; f / f1 = 0.998; TTL = 5.79, ImgH = 4.18, TTL / ImgH = 1.39; R4 = 6.395, R5 = 3.78, (R4 + R5) / (R4 - R5) = 3.89; R6 = 5.381, R7 = 4.551, R6 / R7 = 1.182; CT1 = 0.915, CT2 = 0.235, CT3 = 0.235, CT4 = 0.484, CT5 = 0.495, CT6 = 0.444, CT7 = 0.486, CT1 + CT2 + CT3 + CT4 + CT5 + CT6 + CT7 = 3.294; T34 = 0.237, T23 = 0.259, T34 / T23 = 0.915; f4 / f6 = 0.715; R15 = 1.635, |f7| / R15 = 3.82; SAG51 = -0.451, CT5 / |SAG51| = 1.098; vd6 = 23.54, vd3 = 20.4, vd6 - vd3 = 3.14.

[0218] In this embodiment, the optical imaging system 100 satisfies the conditions in Table 5 and Table 6 below.

[0219]

[0220]

[0221] Table 6 shows the aspheric data of the third embodiment, where k is the conic coefficient of each surface, and A4 - A20 are the 4th - 20th order aspheric coefficients of each surface.

[0222] From Figure 3-2 it can be seen that under the condition of meeting miniaturization, the optical imaging system 100 of the present invention has a high pixel count.

[0223] Fourth Embodiment

[0224] Please refer to Figure 4-1 and Figure 4-2 where Figure 4-1 is a schematic structural diagram of the optical imaging system 100 of the fourth embodiment, Figure 4-2 From left to right are the spherical aberration, astigmatism, and distortion curves of the fourth embodiment of the present invention. From Figure 4-1It can be known that the optical imaging system 100 of this embodiment sequentially includes a diaphragm 10, a first lens L1 with a positive optical power, a second lens L2 with a negative optical power, a third lens L3 with a negative optical power, a fourth lens L4 with a positive optical power, a fifth lens L5 with a positive optical power, a sixth lens L6 with a positive optical power, a seventh lens L7 with a negative optical power, an infrared filter 30, and an imaging surface 50 from the object side to the image side.

[0225] The first lens L1 is made of plastic, and its object side surface S1 and image side surface S2 are both aspherical surfaces. The object side surface S1 is convex both near the optical axis and at the circumference. The image side surface S2 is concave both near the optical axis and at the circumference.

[0226] The second lens L2 is made of plastic, and its object side surface S3 and image side surface S4 are both aspherical surfaces. The object side surface S3 is convex both near the optical axis and at the circumference. The image side surface S4 is concave both near the optical axis and at the circumference.

[0227] The third lens L3 is made of plastic, and its object side surface S5 and image side surface S6 are both aspherical surfaces. The object side surface S5 is convex near the optical axis and concave at the circumference. The image side surface S6 is concave both near the optical axis and at the circumference.

[0228] The fourth lens L4 is made of plastic, and its object side surface S7 and image side surface S8 are both aspherical surfaces. The object side surface S7 is convex near the optical axis and concave at the circumference. The image side surface S8 is convex both near the optical axis and at the circumference.

[0229] The fifth lens L5 is made of plastic, and its object side surface S9 and image side surface S10 are both aspherical surfaces. The object side surface S9 is concave both near the optical axis and at the circumference. The image side surface S10 is convex near the optical axis and concave at the circumference.

[0230] The sixth lens L6 is made of plastic, and its object side surface S11 and image side surface S12 are both aspherical surfaces. The object side surface S11 is convex near the optical axis and concave at the circumference. The image side surface S12 is concave near the optical axis and convex at the circumference.

[0231] The seventh lens L7 is made of plastic, and its object side surface S13 and image side surface S14 are both aspherical surfaces. The object side surface S13 is convex both near the optical axis and at the circumference. The image side surface S14 is concave near the optical axis and convex at the circumference.

[0232] In this embodiment, f12 = 5.82, f = 4.68, f12 / f = 1.244; EPD = 3.171, f / EPD = 1.48; f4 = 14.61, f1 = 4.65, f4 / f1 = 3.14; f2 = -17.43, f6 = 22.36, f7 = -6.22, f2 / f1 + f6 / f7 = -7.34; f / f1 = 1.006; TTL = 5.79, ImgH = 4, TTL / ImgH = 1.45; R4 = 6.635, R5 = 4.192, (R4 + R5) / (R4 - R5) = 4.43; R6 = 6.151, R7 = 4.148, R6 / R7 = 1.483; CT1 = 0.923, CT2 = 0.216, CT3 = 0.216, CT4 = 0.513, CT5 = 0.503, CT6 = 0.445, CT7 = 0.497, CT1 + CT2 + CT3 + CT4 + CT5 + CT6 + CT7 = 3.313; T34 = 0.222, T23 = 0.263, T34 / T23 = 0.844; f4 / f6 = 0.653; R15 = 1.636, |f7| / R15 = 3.8; SAG51 = -0.412, CT5 / |SAG51| = 1.221; vd6 = 23.54, vd3 = 20.4, vd6 - vd3 = 3.14.

[0233] In this embodiment, the optical imaging system 100 satisfies the conditions in Table 7 and Table 8 below.

[0234]

[0235]

[0236]

[0237] Table 8 shows the aspherical data of the fourth embodiment, where k is the conic coefficient of each surface, and A4 - A20 are the 4th - 20th order aspherical coefficients of each surface.

[0238] It can be seen that Figure 4-2 under the condition of meeting miniaturization, the optical imaging system 100 of the present invention has a relatively high pixel count.

[0239] Fifth Embodiment

[0240] Please refer to Figure 5-1 and Figure 5-2 where Figure 5-1 is a schematic structural diagram of the optical imaging system 100 of the fifth embodiment, Figure 5-2 from left to right are the spherical aberration, astigmatism, and distortion curves of the fifth embodiment of the present invention. It can be seen from Figure 5-1It can be known that the optical imaging system 100 of this embodiment sequentially includes a diaphragm 10, a first lens L1 with positive optical power, a second lens L2 with negative optical power, a third lens L3 with positive optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with positive optical power, a sixth lens L6 with positive optical power, a seventh lens L7 with negative optical power, an infrared filter 30, and an imaging surface 50 from the object side to the image side.

[0241] The first lens L1 is made of plastic, and its object side surface S1 and image side surface S2 are both aspherical surfaces. The object side surface S1 is convex both near the optical axis and at the circumference. The image side surface S2 is concave both near the optical axis and at the circumference.

[0242] The second lens L2 is made of plastic, and its object side surface S3 and image side surface S4 are both aspherical surfaces. The object side surface S3 is convex both near the optical axis and at the circumference. The image side surface S4 is concave both near the optical axis and at the circumference.

[0243] The third lens L3 is made of plastic, and its object side surface S5 and image side surface S6 are both aspherical surfaces. The object side surface S5 is convex both near the optical axis and at the circumference. The image side surface S6 is concave both near the optical axis and at the circumference.

[0244] The fourth lens L4 is made of plastic, and its object side surface S7 and image side surface S8 are both aspherical surfaces. The object side surface S7 is concave both near the optical axis and at the circumference. The image side surface S8 is convex both near the optical axis and at the circumference.

[0245] The fifth lens L5 is made of plastic, and its object side surface S9 and image side surface S10 are both aspherical surfaces. The object side surface S9 is concave both near the optical axis and at the circumference. The image side surface S10 is convex near the optical axis and concave at the circumference.

[0246] The sixth lens L6 is made of plastic, and its object side surface S11 and image side surface S12 are both aspherical surfaces. The object side surface S11 is convex near the optical axis and concave at the circumference. The image side surface S12 is concave near the optical axis and convex at the circumference.

[0247] The seventh lens L7 is made of plastic, and its object side surface S13 and image side surface S14 are both aspherical surfaces. The object side surface S13 is convex both near the optical axis and at the circumference. The image side surface S14 is concave near the optical axis and convex at the circumference.

[0248] In this embodiment, f12 = 7.43, f = 5.07, f12 / f = 1.465; EPD = 3.071, f / EPD = 1.65; f4 = 21.46, f1 = 4.42, f4 / f1 = 4.86; f2 = -8.53, f6 = 121.46, f7 = -5.89, f2 / f1 + f6 / f7 = -22.55; f / f1 = 1.147; TTL = 6, ImgH = 4.18, TTL / ImgH = 1.44; R4 = 7.045, R5 = 3.135, (R4 + R5) / (R4 - R5) = 2.6; R6 = 3.62, R7 = 3.976, R6 / R7 = 0.910; CT1 = 0.879, CT2 = 0.222, CT3 = 0.241, CT4 = 0.58, CT5 = 0.467, CT6 = 0.518, CT7 = 0.433, CT1 + CT2 + CT3 + CT4 + CT5 + CT6 + CT7 = 3.340; T34 = 0.347, T23 = 0.216, T34 / T23 = 1.606; f4 / f6 = 0.177; R15 = 1.689, |f7| / R15 = 2.49; SAG51 = -0.452, CT5 / |SAG51| = 1.033; vd6 = 32.02, vd3 = 20.37, vd6 - vd3 = 11.65.

[0249] In this embodiment, the optical imaging system 100 satisfies the conditions in Table 9 and Table 10 below.

[0250]

[0251]

[0252]

[0253] Table 10 shows the aspherical data of the fifth embodiment, where k is the conic coefficient of each surface, and A4 - A20 are the 4th - 20th order aspherical coefficients of each surface.

[0254] It can be seen that Figure 5-2 under the condition of meeting miniaturization, the optical imaging system 100 of the present invention has a relatively high pixel count.

[0255] Sixth Embodiment

[0256] Please refer to Figure 6-1 and Figure 6-2 where Figure 6-1 is a schematic structural diagram of the optical imaging system 100 of the sixth embodiment, Figure 6-2 and from left to right are the spherical aberration, astigmatism, and distortion curves of the sixth embodiment of the present invention. It can be seen from Figure 6-1It can be known that the optical imaging system 100 of this embodiment sequentially includes a diaphragm 10, a first lens L1 with a positive optical power, a second lens L2 with a negative optical power, a third lens L3 with a positive optical power, a fourth lens L4 with a positive optical power, a fifth lens L5 with a negative optical power, a sixth lens L6 with a positive optical power, a seventh lens L7 with a negative optical power, an infrared filter 30, and an imaging surface 50 from the object side to the image side.

[0257] The first lens L1 is made of plastic, and its object side surface S1 and image side surface S2 are both aspherical surfaces. The object side surface S1 is convex both near the optical axis and at the circumference. The image side surface S2 is concave both near the optical axis and at the circumference.

[0258] The second lens L2 is made of plastic, and its object side surface S3 and image side surface S4 are both aspherical surfaces. The object side surface S3 is convex both near the optical axis and at the circumference. The image side surface S4 is concave both near the optical axis and at the circumference.

[0259] The third lens L3 is made of plastic, and its object side surface S5 and image side surface S6 are both aspherical surfaces. The object side surface S5 is convex near the optical axis and concave at the circumference. The image side surface S6 is concave both near the optical axis and at the circumference.

[0260] The fourth lens L4 is made of plastic, and its object side surface S7 and image side surface S8 are both aspherical surfaces. The object side surface S7 is concave both near the optical axis and at the circumference. The image side surface S8 is convex both near the optical axis and at the circumference.

[0261] The fifth lens L5 is made of plastic, and its object side surface S9 and image side surface S10 are both aspherical surfaces. The object side surface S9 is concave both near the optical axis and at the circumference. The image side surface S10 is convex near the optical axis and concave at the circumference.

[0262] The sixth lens L6 is made of plastic, and its object side surface S11 and image side surface S12 are both aspherical surfaces. The object side surface S11 is convex near the optical axis and concave at the circumference. The image side surface S12 is concave near the optical axis and convex at the circumference.

[0263] The seventh lens L7 is made of plastic, and its object side surface S13 and image side surface S14 are both aspherical surfaces. The object side surface S13 is convex both near the optical axis and at the circumference. The image side surface S14 is concave near the optical axis and convex at the circumference.

[0264] In this embodiment, f12 = 9.4, f = 6.34, f12 / f = 1.482; EPD = 4.231, f / EPD = 1.5; f4 = 16.21, f1 = 6.02, f4 / f1 = 2.69; f2 = -12.85, f6 = 10.64, f7 = -6.36, f2 / f1 + f6 / f7 = -3.81; f / f1 = 1.053; TTL = 7.73, ImgH = 5.45, TTL / ImgH = 1.42; R4 = 7.005, R5 = 3.814, (R4 + R5) / (R4 - R5) = 3.39; R6 = 5.132, R7 = 5.488, R6 / R7 = 0.935; CT1 = 1.184, CT2 = 0.3, CT3 = 0.3, CT4 = 0.866, CT5 = 0.383, CT6 = 0.793, CT7 = 0.521, CT1 + CT2 + CT3 + CT4 + CT5 + CT6 + CT7 = 4.347; T34 = 0.442, T23 = 0.315, T34 / T23 = 1.403; f4 / f6 = 1.523; R15 = 2.372, |f7| / R15 = 2.68; SAG51 = -0.534, CT5 / |SAG51| = 0.717; vd6 = 30.27, vd3 = 19.24, vd6 - vd3 = 11.03.

[0265] In this embodiment, the optical imaging system 100 satisfies the conditions in Table 11 and Table 12 below.

[0266]

[0267]

[0268]

[0269] Table 12 shows the aspherical data of the sixth embodiment, where k is the conic coefficient of each surface, and A4 - A20 are the 4th - 20th order aspherical coefficients of each surface.

[0270] It can be seen that Figure 6-2 the optical imaging system 100 of the present invention has a relatively high pixel count while meeting the requirements of miniaturization.

[0271] Seventh Embodiment

[0272] Please refer to Figure 7-1 and Figure 7-2 where Figure 7-1 is a schematic structural diagram of the optical imaging system 100 of the seventh embodiment, Figure 7-2 which are the spherical aberration, astigmatism, and distortion curves of the seventh embodiment of the present invention from left to right. It can be seen from Figure 7-1It can be known that the optical imaging system 100 of this embodiment sequentially includes a diaphragm 10, a first lens L1 with positive optical power, a second lens L2 with negative optical power, a third lens L3 with positive optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with positive optical power, a sixth lens L6 with positive optical power, a seventh lens L7 with negative optical power, an infrared filter 30, and an imaging surface 50 from the object side to the image side.

[0273] The first lens L1 is made of plastic, and its object side surface S1 and image side surface S2 are both aspherical surfaces. The object side surface S1 is convex both near the optical axis and at the circumference. The image side surface S2 is concave both near the optical axis and at the circumference.

[0274] The second lens L2 is made of plastic, and its object side surface S3 and image side surface S4 are both aspherical surfaces. The object side surface S3 is convex both near the optical axis and at the circumference. The image side surface S4 is concave both near the optical axis and at the circumference.

[0275] The third lens L3 is made of plastic, and its object side surface S5 and image side surface S6 are both aspherical surfaces. The object side surface S5 is convex near the optical axis and concave at the circumference. The image side surface S6 is concave both near the optical axis and at the circumference.

[0276] The fourth lens L4 is made of plastic, and its object side surface S7 and image side surface S8 are both aspherical surfaces. The object side surface S7 is convex near the optical axis and concave at the circumference. The image side surface S8 is concave near the optical axis and convex at the circumference.

[0277] The fifth lens L5 is made of plastic, and its object side surface S9 and image side surface S10 are both aspherical surfaces. The object side surface S9 is concave both near the optical axis and at the circumference. The image side surface S10 is convex near the optical axis and concave at the circumference.

[0278] The sixth lens L6 is made of plastic, and its object side surface S11 and image side surface S12 are both aspherical surfaces. The object side surface S11 is convex near the optical axis and concave at the circumference. The image side surface S12 is concave near the optical axis and convex at the circumference.

[0279] The seventh lens L7 is made of plastic, and its object side surface S13 and image side surface S14 are both aspherical surfaces. The object side surface S13 is convex both near the optical axis and at the circumference. The image side surface S14 is concave near the optical axis and convex at the circumference.

[0280] In this embodiment, f12 = 7.2, f = 4.72, f12 / f = 1.525; EPD = 2.778, f / EPD = 1.7; f4 = 24.38, f1 = 4.42, f4 / f1 = 5.52; f2 = -9.15, f6 = 31.03, f7 = -6.02, f2 / f1 + f6 / f7 = -7.22; f / f1 = 1.068; TTL = 5.79, ImgH = 4.18, TTL / ImgH = 1.39; R4 = 9.073, R5 = 3.644, (R4 + R5) / (R4 - R5) = 2.34; R6 = 3.699, R7 = 4.09, R6 / R7 = 0.904; CT1 = 0.79, CT2 = 0.23, CT3 = 0.271, CT4 = 0.521, CT5 = 0.501, CT6 = 0.508, CT7 = 0.476, CT1 + CT2 + CT3 + CT4 + CT5 + CT6 + CT7 = 3.297; T34 = 0.311, T23 = 0.214, T34 / T23 = 1.453; f4 / f6 = 0.786; R15 = 1.586, |f7| / R15 = 3.8; SAG51 = -0.425, CT5 / |SAG51| = 1.179; vd6 = 23.54, vd3 = 20.37, vd6 - vd3 = 3.17.

[0281] In this embodiment, the optical imaging system 100 satisfies the conditions in Table 13 and Table 14 below.

[0282]

[0283]

[0284]

[0285] Table 14 shows the aspherical data of the seventh embodiment, where k is the conic coefficient of each surface, and A4 - A20 are the 4th - 20th order aspherical coefficients of each surface.

[0286] From Figure 7-2 it can be seen that under the condition of meeting miniaturization, the optical imaging system 100 of the present invention has a high pixel count.

[0287] Eighth Embodiment

[0288] Please refer to Figure 8-1 and Figure 8-2 where Figure 8-1 is a schematic structural diagram of the optical imaging system 100 of the eighth embodiment, Figure 8-2 and from left to right are the spherical aberration, astigmatism, and distortion curves of the eighth embodiment of the present invention. From Figure 8-1It can be known that the optical imaging system 100 of this embodiment sequentially includes a diaphragm 10, a first lens L1 with positive optical power, a second lens L2 with negative optical power, a third lens L3 with negative optical power, a fourth lens L4 with positive optical power, a fifth lens L5 with negative optical power, a sixth lens L6 with positive optical power, a seventh lens L7 with negative optical power, an infrared filter 30, and an imaging surface 50 from the object side to the image side.

[0289] The first lens L1 is made of plastic, and its object side surface S1 and image side surface S2 are both aspherical surfaces. The object side surface S1 is convex both near the optical axis and at the circumference. The image side surface S2 is concave both near the optical axis and at the circumference.

[0290] The second lens L2 is made of plastic, and its object side surface S3 and image side surface S4 are both aspherical surfaces. The object side surface S3 is convex both near the optical axis and at the circumference. The image side surface S4 is concave both near the optical axis and at the circumference.

[0291] The third lens L3 is made of plastic, and its object side surface S5 and image side surface S6 are both aspherical surfaces. The object side surface S5 is convex both near the optical axis and at the circumference. The image side surface S6 is concave both near the optical axis and at the circumference.

[0292] The fourth lens L4 is made of plastic, and its object side surface S7 and image side surface S8 are both aspherical surfaces. The object side surface S7 is convex near the optical axis and concave at the circumference. The image side surface S8 is concave near the optical axis and convex at the circumference.

[0293] The fifth lens L5 is made of plastic, and its object side surface S9 and image side surface S10 are both aspherical surfaces. The object side surface S9 is concave both near the optical axis and at the circumference. The image side surface S10 is convex near the optical axis and concave at the circumference.

[0294] The sixth lens L6 is made of plastic, and its object side surface S11 and image side surface S12 are both aspherical surfaces. The object side surface S11 is convex near the optical axis and concave at the circumference. The image side surface S12 is concave both near the optical axis and at the circumference.

[0295] The seventh lens L7 is made of plastic, and its object side surface S13 and image side surface S14 are both aspherical surfaces. The object side surface S13 is convex near the optical axis and concave at the circumference. The image side surface S14 is concave near the optical axis and convex at the circumference.

[0296] In this embodiment, f12 = 7.3, f = 5.21, f12 / f = 1.401; EPD = 2.895, f / EPD = 1.8; f4 = 29.09, f1 = 4.71, f4 / f1 = 6.18; f2 = -10.46, f6 = 14.83, f7 = -8.93, f2 / f1 + f6 / f7 = -3.88; f / f1 = 1.106; TTL = 6.51, ImgH = 4.22, TTL / ImgH = 1.54; R4 = 12.031, R5 = 4.426, (R4 + R5) / (R4 - R5) = 2.16; R6 = 4.709, R7 = 4.507, R6 / R7 = 1.045; CT1 = 0.937, CT2 = 0.23, CT3 = 0.3, CT4 = 0.661, CT5 = 0.493, CT6 = 0.574, CT7 = 0.716, CT1 + CT2 + CT3 + CT4 + CT5 + CT6 + CT7 = 3.911; T34 = 4.507, T23 = 4.426, T34 / T23 = 1.018; f4 / f6 = 1.962; R15 = 1.722, |f7| / R15 = 5.19; SAG51 = -0.398, CT5 / |SAG51| = 1.239; vd6 = 55.79, vd3 = 20.37, vd6 - vd3 = 35.42.

[0297] In this embodiment, the optical imaging system 100 satisfies the conditions in Table 15 and Table 16 below.

[0298]

[0299]

[0300]

[0301] Table 16 shows the aspherical data of the eighth embodiment, where k is the conic coefficient of each surface, and A4 - A20 are the 4th - 20th order aspherical coefficients of each surface.

[0302] It can be seen that Figure 8-2 under the condition of meeting miniaturization, the optical imaging system 100 of the present invention has a relatively high pixel count.

[0303] As Figure 9 shown, the present invention also provides an imaging device 200 including the optical imaging system 100 of the present invention and a photosensitive element 210. The photosensitive element 210 is located on the image side of the optical imaging system 100.

[0304] The photosensitive element 210 of the present invention can be a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor Sensor (CMOS sensor).

[0305] For other feature descriptions of the imaging device 200, please refer to the above description and will not be elaborated here.

[0306] As Figure 10 shown, the present invention further provides an electronic device 300, which includes a device body 310 and the imaging device 200 of the present invention. The orientation device 200 is installed on the device body 310.

[0307] The electronic device 300 of the present invention includes, but is not limited to, a computer, a laptop, a tablet computer, a mobile phone, a camera, a smart bracelet, a smart watch, smart glasses, etc.

[0308] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An optical imaging system, characterized in that, There are a total of seven lenses with refractive power, which successively include from the object side to the image side: The first lens with positive refractive power; The second lens with negative refractive power; The third lens with refractive power; The fourth lens with positive refractive power; The fifth lens with refractive power; The sixth lens with positive refractive power; The seventh lens with negative refractive power; Among them, the optical imaging system satisfies the following relational expressions: 1.0 < f12 / f < 2.0; f / EPD ≤ 1.8; 0.1 < f4 / f6 < 2.0; Among them, f12 is the combined focal length of the first lens and the second lens, f is the total effective focal length of the optical imaging system, EPD is the entrance pupil diameter of the optical imaging system, f4 is the effective focal length of the fourth lens, and f6 is the effective focal length of the sixth lens.

2. The optical imaging system according to claim 1, wherein The object side surfaces and image side surfaces of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are all aspherical surfaces, and at least one inflection point is provided on at least one of the object side surface and the image side surface of the sixth lens.

3. The optical imaging system according to claim 1, characterized in that, The optical imaging system satisfies at least one of the following conditions: For the first lens, the object side surface is convex near the optical axis and the image side surface is concave near the optical axis; For the second lens, the object side surface is convex near the optical axis and the image side surface is concave near the optical axis; For the third lens, the object side surface is convex near the optical axis and the image side surface is concave near the optical axis; For the fifth lens, the object side surface is concave near the optical axis and the image side surface is convex near the optical axis; For the sixth lens, the object side surface is convex near the optical axis and the image side surface is concave near the optical axis; For the seventh lens, the object side surface is convex near the optical axis and the image side surface is concave near the optical axis.

4. The optical imaging system according to claim 1, wherein Both the object side surface near the optical axis and the circumferential part of the first lens are convex, and both the image side surface near the optical axis and the circumferential part are concave; Both the object side surface near the optical axis and the circumferential part of the second lens are convex, and both the image side surface near the optical axis and the circumferential part are concave.

5. The optical imaging system according to claim 1, wherein The object side surface of the third lens is convex near the optical axis; the image side surface is concave near the optical axis and at the circumferential part.

6. The optical imaging system according to claim 1, characterized in that, The circumferential part of the object side surface of the fourth lens is concave; the circumferential part of the image side surface is convex.

7. The optical imaging system according to claim 1, characterized in that, Both the object side surface near the optical axis and the circumferential part of the fifth lens are concave; the image side surface is convex near the optical axis and concave at the circumferential part.

8. The optical imaging system according to claim 1, wherein The object side surface of the sixth lens is convex near the optical axis and concave at the circumferential part; the image side surface is concave near the optical axis.

9. The optical imaging system according to claim 1, characterized in that The object side surface of the seventh lens is convex near the optical axis; the image side surface is concave near the optical axis and convex at the circumferential part.

10. The optical imaging system according to any one of claims 1-9, characterized in that, The optical imaging system further includes an infrared filter, and the infrared filter is located between the seventh lens and the imaging surface; The optical imaging system further includes a diaphragm, and the diaphragm is located on the object side of the first lens.

11. The optical imaging system according to claim 10, characterized in that, The optical imaging system satisfies the following conditional expression: 2.6 < f4 / f1 < 6.5; Among them, f1 is the effective focal length of the first lens, and f4 is the effective focal length of the fourth lens.

12. The optical imaging system according to claim 10, wherein The optical imaging system satisfies the following conditional expression: -25 < f2 / f1 + f6 / f7 < -1; Wherein, f1 is the effective focal length of the first lens, f2 is the effective focal length of the second lens, f6 is the effective focal length of the sixth lens, and f7 is the effective focal length of the seventh lens.

13. The optical imaging system according to claim 10, characterized in that, The optical imaging system satisfies at least one of the following conditional expressions: 0.5 < f / f1 < 1.5; and 1.39 ≤ TTL / ImgH < 1.6; Wherein, f is the total effective focal length of the optical imaging system, f1 is the effective focal length of the first lens, TTL is the distance from the object side surface of the first lens to the imaging surface of the optical imaging system, and ImgH is half of the diagonal length of the effective pixel region on the imaging surface.

14. The optical imaging system according to claim 10, wherein The optical imaging system satisfies the following conditional expression: TTL / ImgH < 1.6; Wherein, TTL is the distance from the object side surface of the first lens to the imaging surface of the optical imaging system, and ImgH is half of the diagonal length of the effective pixel region on the imaging surface.

15. The optical imaging system according to claim 10, wherein, The optical imaging system satisfies the following conditional expression: 2.0 < (R4 + R5) / (R4 - R5) < 5.0; Wherein, R4 is the radius of curvature of the object side surface of the second lens, and R5 is the radius of curvature of the image side surface of the second lens.

16. The optical imaging system according to claim 10, wherein The optical imaging system satisfies the following conditional expression: 0.6 < R6 / R7 < 1.8; Wherein, R6 is the radius of curvature of the object side surface of the third lens, and R7 is the radius of curvature of the image side surface of the third lens.

17. The optical imaging system according to claim 10, characterized in that, The optical imaging system satisfies the following conditional expression: 3.1 < ∑CT < 4.5; Wherein, ∑CT is the sum of the thicknesses of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens on the optical axis.

18. The optical imaging system according to claim 10, characterized in that, The optical imaging system satisfies the following conditional expression: 0.6 < T34 / T23 < 2.0; Wherein, T23 is the distance on the optical axis from the image side surface of the second lens to the object side surface of the third lens, and T34 is the distance on the optical axis from the image side surface of the third lens to the object side surface of the fourth lens.

19. The optical imaging system according to claim 1, wherein The optical imaging system satisfies the following conditional expression: 1.48 ≤ f / EPD ≤ 1.

8.

20. The optical imaging system according to claim 10, wherein The optical imaging system satisfies the following conditional expression: 2.1 < |f7| / R15 < 5.5; Wherein, f7 is the effective focal length of the seventh lens, and R15 is the radius of curvature of the image side surface of the seventh lens.

21. The optical imaging system according to claim 10, wherein The optical imaging system satisfies the following conditional expression: 0.5 < CT5 / |SAG51| < 1.5; Wherein, CT5 is the thickness of the fifth lens on the optical axis, and Sag51 is the horizontal displacement in the optical axis direction 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.

22. The optical imaging system according to claim 10, wherein The optical imaging system satisfies the following conditional expression: 0 < vd6 - vd3 < 40; Wherein, vd3 is the Abbe number of the third lens, and vd6 is the Abbe number of the sixth lens.

23. An imaging device, characterized in that, Comprising: The optical imaging system according to any one of claims 1-22; And An image sensor located on the image side of the optical imaging system.

24. An electronic device, characterized in that, Comprising: A device body and; The imaging device according to claim 23, the imaging device being mounted on the device body.

Images