Optical imaging system and imaging device having the same

Abstract

The present invention discloses an optical imaging system and an imaging device having the same. The optical imaging system includes the following lenses, which are coaxially arranged in sequence from the object side to the image side: the first lens to the seventh lens, wherein the first lens has a negative refractive power, and the object side surface is a convex surface at the near optical axis, and the image side surface is a concave surface at the near optical axis; the second lens has a negative refractive power, and the image side surface is a concave surface at the near optical axis; the third lens has a refractive power, and the object side surface is a convex surface at the near optical axis, and the image side surface is a concave surface at the near optical axis; the fourth lens has a refractive power, and the image side surface is a concave surface at the near optical axis; the fifth lens has a positive refractive power, and the image side surface is a convex surface at the near optical axis; the sixth lens has a refractive power, and the object side surface is a convex surface at the near optical axis; and the seventh lens has a refractive power. Thus, the first lens and the second lens both have a negative refractive power to diverge the incoming light, so as to obtain a wide angle, and the fifth lens has a positive refractive power to focus the light before imaging, so as to make the imaging clearer.

Description

Technical Field

[0001] The present invention relates to the field of lenses, and in particular to an optical imaging system and an imaging device having the same. Background Art

[0002] The rapid development of manufacturing technology for electronic products such as smartphones, tablets, and cameras in the market and the increasingly diversified development trend of user needs have gradually increased the demand for miniaturized camera lenses. A mobile phone is equipped with multiple cameras with different characteristics and application environments at the same time. As the size and thickness of electronic products such as mobile phones remain the same or even decrease, more stringent requirements are put forward for the miniaturization of mobile phone lenses. At the same time, with the improvement of semiconductor process technology, the pixel size of photosensitive elements has become smaller, so miniaturized lenses with good imaging quality have become the mainstream of the market.

[0003] A better imaging experience can capture more users. Today's imaging devices need to be equipped with large photosensitive elements, while considering high imaging quality, large aperture and miniaturized size. In order to achieve high imaging quality and large aperture effects, the number of lenses in the imaging device also needs to be increased. The increase in the number of lenses also makes it difficult to achieve miniaturization of the lens. Therefore, how to reasonably configure the surface shape, refractive power, thickness and spacing of multiple lenses in the optical imaging system, as well as the type of lens materials, effectively shorten the back focal length of the optical imaging system, and thus maintain the miniaturization of the lens, and achieve large aperture and high pixel characteristics, is one of the problems that the industry currently wants to solve. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide an optical imaging system with wide angle and high imaging clarity.

[0005] According to an optical imaging system of an embodiment of the first aspect of the present invention, it includes: a first lens to a seventh lens coaxially arranged in sequence from the object side to the image side, wherein the first lens has a negative refractive power, and the object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis; the second lens has a negative refractive power, and the image side surface is concave at the near optical axis; the third lens has a refractive power, and the object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis; the fourth lens has a refractive power, and the image side surface is concave at the near optical axis; the fifth lens has a positive refractive power, and the image side surface is convex at the near optical axis; the sixth lens has a refractive power, and the object side surface is convex at the near optical axis; the seventh lens has a refractive power.

[0006] Accordingly, both the first lens and the second lens have negative refractive powers to diverge the light rays entering the optical system from the object side, thereby enabling a wide angle to be obtained. The fifth lens is arranged to have a positive refractive power so that the light rays can be focused before imaging, thus taking into account the clarity of imaging. At the same time, the image sides of the first to fourth lenses are concave, and the use of image sides with the same concave-convex direction makes the overall thickness of the optical imaging system smaller, making the optical imaging system more miniaturized.

[0007] In some embodiments, tan(HFOV)>3.5, where HFOV is half of the maximum field of view angle of the optical imaging system. Accordingly, by satisfying the above numerical conditions, the field of view angle range of the optical imaging system can be increased, thereby obtaining a wider imaging range.

[0008] In some embodiments, FNO≤2.2, where FNO is the f-number of the optical imaging system. On the premise of maintaining the miniaturization of the lens, the large aperture characteristic of the optical imaging system is realized. In this way, when the aperture is large, the luminous flux of the optical imaging system is also large, so even when shooting in a relatively dark environment, a clear imaging effect can be achieved.

[0009] In some embodiments, 0.5<(sag11+sag12) / f1<1.2, where sag11 is the axial distance from the intersection of the object side of the first lens and the optical axis to the maximum effective radius of the object side of the first lens; sag12 is the axial distance from the intersection of the image side of the first lens and the optical axis to the maximum effective radius of the image side of the first lens. Accordingly, by reasonably configuring the ratio of the sum of the sag heights of the object side and the image side of the first lens to the focal length of the first lens, it is beneficial to effectively bend the light rays to transition to the second lens, and at the same time, it can avoid the first lens from being too curved, thereby reducing the processing difficulty and the assembly sensitivity of the entire lens group (optical imaging system).

[0010] In some embodiments, 2<TTL / sd11<3.2, where TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the near optical axis, and sd11 is the maximum effective radius of the object side of the first lens. Accordingly, by reasonably configuring the ratio of the distance from the object side of the first lens to the imaging surface of the optical imaging system on the near optical axis to the maximum effective semi-aperture of the object side of the first lens, it helps to shorten the total length of the lens group (optical imaging system), increase the field of view angle of the lens group, and realize the wide-angle feature.

[0011] In some embodiments, 4 < f2345 / at2345 < 12, where f2345 is the combined effective focal length of the second, third, fourth, and fifth lenses, and at2345 is the sum of the air gaps between adjacent lenses of the second, third, fourth, and fifth lenses. By reasonably configuring the ratio of the combined focal length of the second, third, fourth, and fifth lenses to the sum of the air gaps between adjacent lenses of the second, third, fourth, and fifth lenses, the overall optical length of the optical imaging system can be effectively shortened, the miniaturization of the optical imaging system can be achieved, and in addition, it is beneficial to cooperate with the first lens and the sixth and seventh lenses to correct aberrations and reach a balanced state.

[0012] In some embodiments, 2 < f67 / f < 5, where f67 is the combined effective focal length of the sixth lens and the seventh lens, and f is the effective focal length of the optical imaging system. Satisfying the above relationship and reasonably configuring the ratio of the combined effective focal length of the sixth and seventh lenses to the effective focal length of the optical imaging system is beneficial to correcting off-axis aberrations of the optical imaging system and improving the imaging quality of the lens group.

[0013] In some embodiments, 1 < sag22 / sag31 < 2, where sag22 is the axial distance from the intersection of the image side surface of the second lens and the optical axis to the maximum effective radius of the image side surface of the second lens, and sag31 is the axial distance from the intersection of the object side surface of the third lens and the optical axis to the maximum effective radius of the object side surface of the third lens. In this way, by reasonably configuring the ratio of the sag of the image side surface of the second lens to the sag of the object side surface of the third lens, it is beneficial to reduce the curvature of the image side surface of the second lens and the object side surface of the third lens and reduce the processing difficulty; in addition, the sags of the image side surface of the second lens and the object side surface of the third lens cooperate with each other, which is beneficial to the stable and smooth transition of light to the next lens.

[0014] In some embodiments, 1.5 < -f2 / f < 4.5, where f2 is the effective focal length of the second lens and f is the effective focal length of the optical imaging system. Therefore, by reasonably setting the ratio of the effective focal length of the second lens to the effective focal length of the optical imaging system, it is beneficial to shorten the overall length of the lens group, and at the same time cooperate with other lenses to correct the aberrations of the lens group and improve the aberration correction ability of the optical imaging system.

[0015] The image-taking device according to the second aspect embodiment of the present invention includes the optical system described above. The image-taking device can be a lens module or an electronic device having a lens module, such as a mobile phone, a computer, etc. The image-taking device can have an electronic photosensitive element, and the electronic sensing element is arranged on the imaging surface of the optical imaging system. Through the integrated setting of the optical imaging system and the electronic photosensitive element, the image formed by the optical imaging system can be collected and transmitted to the image-taking device through the electronic sensing element, thereby realizing the image-taking of the image-taking device.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 is a schematic structural diagram of an optical imaging system according to a first embodiment of the present invention;

[0019] Figure 2A is a longitudinal spherical aberration curve diagram of the optical imaging system of the first embodiment of the present invention (mm);

[0020] Figure 2B is an astigmatism curve diagram (mm) of the optical imaging system of the first embodiment of the present invention;

[0021] Figure 2C is a distortion curve diagram (%) of the optical imaging system of the first embodiment of the present invention;

[0022] Figure 3 is a schematic structural diagram of an optical imaging system according to a second embodiment of the present invention;

[0023] Figure 4A is a longitudinal spherical aberration curve diagram of the optical imaging system of the second embodiment of the present invention (mm);

[0024] Figure 4B is an astigmatism curve diagram (mm) of the optical imaging system of the second embodiment of the present invention;

[0025] Figure 4C is a distortion curve diagram (%) of the optical imaging system of the second embodiment of the present invention;

[0026] Figure 5 is a schematic structural diagram of an optical imaging system according to a third embodiment of the present invention;

[0027] Fig. 6A is a longitudinal spherical aberration curve diagram of the optical imaging system of the third embodiment of the present invention (mm);

[0028] Figure 6B is an astigmatism curve diagram (mm) of the optical imaging system of the third embodiment of the present invention;

[0029] Figure 6C is a distortion curve diagram (%) of the optical imaging system of the third embodiment of the present invention;

[0030] Figure 7 is a schematic structural diagram of an optical imaging system according to a fourth embodiment of the present invention;

[0031] Fig. 8A is a longitudinal spherical aberration curve diagram of the optical imaging system of the fourth embodiment of the present invention (mm);

[0032] Figure 8B is an astigmatism curve diagram (mm) of the optical imaging system of the fourth embodiment of the present invention;

[0033] Figure 8C is a distortion curve diagram (%) of the optical imaging system of the fourth embodiment of the present invention;

[0034] Fig. 9 is a schematic structural diagram of an optical imaging system according to a fifth embodiment of the present invention;

[0035] Fig. 10A is a longitudinal spherical aberration curve diagram of the optical imaging system of the fifth embodiment of the present invention (mm);

[0036] Fig. 10B is an astigmatism curve diagram (mm) of the optical imaging system of the fifth embodiment of the present invention;

[0037] Fig. 10C is a distortion curve diagram (%) of the optical imaging system of the fifth embodiment of the present invention;

[0038] Fig.11 is a schematic structural diagram of an optical imaging system according to a sixth embodiment of the present invention;

[0039] Fig. 12A is a longitudinal spherical aberration curve diagram of the optical imaging system of the sixth embodiment of the present invention (mm);

[0040] Fig. 12B is an astigmatism curve diagram (mm) of the optical imaging system of the sixth embodiment of the present invention;

[0041] Fig. 12C is a distortion curve diagram (%) of the optical imaging system of the sixth embodiment of the present invention;

[0042] Reference numerals:

[0043] first lens L1; object-side surface S1 of the first lens; image-side surface S2 of the first lens L1;

[0044] The second lens L2; ​​the object-side surface S3 of the second lens; the image-side surface S4 of the second lens;

[0045] The third lens L3; the object-side surface S5 of the third lens; the image-side surface S6 of the third lens;

[0046] The fourth lens L4; the object-side surface S7 of the fourth lens; the image-side surface S8 of the fourth lens;

[0047] Aperture 110;

[0048] The fifth lens L5; the object-side surface S10 of the fifth lens; the image-side surface S11 of the fifth lens;

[0049] The sixth lens L6; the object-side surface S12 of the sixth lens; the image-side surface S13 of the sixth lens;

[0050] The seventh lens L7; the object-side surface of the seventh lens S14; the image-side surface of the seventh lens S15;

[0051] Infrared cut-off filter 120; object side surface S16 of the infrared cut-off filter; image side surface S17 of the infrared cut-off filter;

[0052] Imaging surface S17;

[0053] Optical system 100. DETAILED DESCRIPTION

[0054] Embodiments of the present invention are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. Embodiments of the present invention are described in detail below.

[0055] Reference below Figure 1-12C An optical imaging system according to an embodiment of the present invention is described.

[0056] The optical imaging system according to the first aspect of the embodiment of the present invention comprises: a first lens to a seventh lens which are coaxially arranged in sequence from the object side to the image side.

[0057] The first lens has negative refractive power, and the object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The second lens has negative refractive power, and the image side surface is concave at the near optical axis. The third lens has refractive power, and the object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The fourth lens has refractive power, and the image side surface is concave at the near optical axis. The fifth lens has positive refractive power, and the image side surface is convex at the near optical axis. The sixth lens has refractive power, and the object side surface is convex at the near optical axis. The seventh lens has refractive power.

[0058] Thus, the first lens and the second lens both have negative refractive power to diverge the light that is taken into the optical system from the object side, so that a larger aperture and wide angle can be obtained, and the fifth lens is set to have positive refractive power so that the light can be focused before imaging, thereby taking into account the clarity of the imaging; at the same time, the image side surfaces of the first to fourth lenses are concave, and the image side surfaces with the same concave and convex directions make the overall thickness of the optical imaging system smaller, making the optical imaging system more miniaturized. Optionally, tan(HFOV)>3.5, where HFOV is half of the maximum field of view of the optical imaging system. Thus, by meeting the above numerical conditions, the field of view angle range of the optical imaging system can be improved, thereby obtaining a wider imaging range.

[0059] In order to achieve the large aperture characteristic of the optical imaging system while maintaining the miniaturization of the lens, the following aperture value range can be selected: FNO ≤ 2.2, where FNO is the aperture number of the optical imaging system. In this way, when the aperture is large, the light flux per unit time of the optical imaging system is also large. Therefore, even when shooting in a relatively dark environment, a clear imaging effect can be achieved.

[0060] In some alternative embodiments, 0.5 < (sag11 + sag12) / f1 < 1.2, where sag11 is the axial distance from the intersection of the object side surface of the first lens and the optical axis to the maximum effective radius of the object side surface of the first lens; sag12 is the axial distance from the intersection of the image side surface of the first lens and the optical axis to the maximum effective radius of the image side surface of the first lens. Thus, reasonably configuring the ratio of the sum of the sag heights of the object side and the image side of the first lens to the focal length of the first lens is beneficial for effectively bending the light rays to transition to the second lens and can also prevent the first lens from being overly curved, thereby reducing the processing difficulty and the assembly sensitivity of the entire lens group (optical imaging system).

[0061] As a preferred embodiment, 2 < TTL / sd11 < 3.2, where TTL is the distance on the near optical axis from the object side surface of the first lens to the imaging surface of the optical imaging system, which can also be referred to as the total system length. sd11 is the maximum effective radius of the object side surface of the first lens. Thus, reasonably configuring the ratio of the distance on the near optical axis from the object side surface of the first lens to the imaging surface of the optical imaging system to the maximum effective semi-aperture of the object side surface of the first lens helps to shorten the total length of the lens group (optical imaging system), increase the field of view angle of the lens group, and achieve the wide-angle characteristic.

[0062] In some embodiments, 4 < f2345 / at2345 < 12, where f2345 is the combined effective focal length of the second, third, fourth, and fifth lenses, and at2345 is the sum of the air gaps between adjacent lenses of the second, third, fourth, and fifth lenses. Satisfying the above relationship and reasonably configuring the ratio of the combined focal length of the second, third, fourth, and fifth lenses to the sum of the air gaps between adjacent lenses of the second, third, fourth, and fifth lenses can effectively shorten the optical total length of the optical imaging system, achieve the miniaturization of the optical imaging system, and is also beneficial for correcting aberrations in cooperation with the first lens and the sixth and seventh lenses to reach a balanced state. When f2345 / at2345 > 12, the positive refractive power provided by the combined focal length of the second, third, fourth, and fifth lenses is insufficient, which is not conducive to correcting aberrations.

[0063] Advantageously, 2 < f67 / f < 5, where f67 is the combined effective focal length of the sixth lens and the seventh lens, and f is the effective focal length of the optical imaging system. Satisfying the above relationship and reasonably configuring the ratio of the combined effective focal length of the sixth and seventh lenses to the effective focal length of the optical imaging system is beneficial to correcting the off-axis aberration of the optical imaging system and improving the imaging quality of the lens group. When f67 / f < 2, the sixth and seventh lenses provide too much positive refractive power, which is not conducive to the concentration of off-axis field light towards the image plane and is also not conducive to aberration correction.

[0064] In some embodiments, 1 < sag22 / sag31 < 2, where sag22 is the axial distance from the intersection of the image side surface of the second lens and the optical axis to the maximum effective radius of the image side surface of the second lens, and sag31 is the axial distance from the intersection of the object side surface of the third lens and the optical axis to the maximum effective radius of the object side surface of the third lens.

[0065] In this way, reasonably configuring the ratio of the sag of the image side surface of the second lens to the sag of the object side surface of the third lens is beneficial to reducing the curvature of the image side surface of the second lens and the object side surface of the third lens and reducing the processing difficulty; in addition, the sags of the image side surface of the second lens and the object side surface of the third lens cooperate with each other, which is beneficial to the stable and gentle transition of light to the next lens.

[0066] The applicant's research finds that for the optical imaging system of the embodiments of the present invention, when -f2 / f > 4.5, the negative refractive power provided by the second lens is insufficient, and off-axis field light is prone to deflect towards the on-axis field, resulting in an increased risk of on-axis ghost image formation; when -f2 / f < 1.5, the negative refractive power provided by the second lens is excessive, and off-axis field light diverges too much, reducing the imaging quality. Therefore, the following setting is selected: 1.5 < -f2 / f < 4.5, where f2 is the effective focal length of the second lens, and f is the effective focal length of the optical imaging system. Thus, reasonably setting the ratio of the effective focal length of the second lens to the effective focal length of the optical imaging system is beneficial to shortening the total length of the lens group, and at the same time cooperating with other lenses to correct the lens group aberration and improve the aberration correction ability of the optical imaging system.

[0067] The optical imaging system of the present invention will be described in detail through the following specific embodiments in conjunction with the accompanying drawings.

[0068] First Embodiment

[0069] The optical imaging system of the first embodiment includes, arranged from the object side to the image side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture 110, a fifth lens L5, a sixth lens L6, a seventh lens L7, an infrared cut-off filter 120, and an imaging surface S18. The focal length f of the optical system of the first embodiment is 0.941 mm, the aperture FNO is 1.9°, the field of view FOV is 153°, and the total length TTL of the system is 7.448 mm.

[0070] The first lens L1 has negative refractive power and is made of plastic. On the optical axis, the object side S1 is convex in the paraxial area, and the image side S2 is concave in the paraxial area; on the circumference, the object side S1 is convex in the paraxial area, and the image side S2 is concave in the paraxial area; and both the object side S1 and the image side S2 are aspherical.

[0071] The second lens L2 has negative refractive power and is made of plastic. On the optical axis, the object side S3 paraxial area is convex, and the image side S4 paraxial area is concave; on the circumference, the object side S3 paraxial area is convex, and the image side S4 paraxial area is concave; and both the object side S3 and the image side S4 are aspherical.

[0072] The third lens L3 has positive refractive power and is made of plastic. On the optical axis, the object side S5 paraxial area is convex, and the image side S6 paraxial area is concave; on the circumference, the object side S5 paraxial area is convex, and the image side S6 paraxial area is concave; and both the object side S5 and the image side S6 are aspherical.

[0073] The fourth lens L4 has negative refractive power and is made of plastic. On the optical axis, the object side S7 paraxial region is convex, and the image side S8 paraxial region is concave; on the circumference, the object side S7 paraxial region is convex, and the image side S8 paraxial region is concave; and both the object side S7 and the image side S8 are aspherical.

[0074] The fifth lens L5 has positive refractive power and is made of plastic. Its object-side surface S10 paraxial region relative to the optical axis is convex, and its image-side surface S11 paraxial region is convex. Its object-side surface S10 paraxial region relative to the circumference is convex, and its image-side surface S11 paraxial region is concave. Both the object-side surface S10 and the image-side surface S11 are aspherical surfaces.

[0075] The sixth lens L6 has positive refractive power and is made of plastic. On the optical axis, the object side S12 paraxial region is convex, and the image side S13 paraxial region is convex; on the circumference, the object side S12 paraxial region is convex, and the image side S13 paraxial region is concave; and both the object side S12 and the image side S13 are aspherical.

[0076] The seventh lens L7 has negative refractive power and is made of plastic. On the optical axis, the object side S14 paraxial region is concave, and the image side S15 paraxial region is convex; on the circumference, the object side S14 paraxial region is convex, and the image side S15 paraxial region is convex; and both the object side S14 and the image side S15 are aspherical.

[0077] The infrared cut filter 120 is made of glass, and is disposed between the seventh lens L7 and the imaging surface S18 without affecting the focal length of the optical imaging system. The object side surface S16 and the image side surface S17 of the infrared cut filter are both spherical surfaces.

[0078] See below Figures 1 to 2C , Figure 2A The longitudinal spherical aberration curve of the optical imaging system of the first embodiment is shown, which indicates that light rays with different aperture angles intersect the optical axis at different points, and have different deviations relative to the ideal point, and the ordinate is the normalized field of view; Figure 2B 1 shows an astigmatism curve of the optical imaging system of the first embodiment, which represents the meridional image curvature and the sagittal image curvature, and the ordinate is the image height in mm; Figure 2C The distortion curve of the optical imaging system of the first embodiment is shown, which represents the distortion magnitude value under different viewing angles, and the ordinate is the image height in mm. Among them, the reference wavelength of astigmatism and distortion is 555nm, the units of Y radius and focal length are mm, the reference wavelength of focal length is 555nm, and the reference wavelength of refractive index and Abbe number is 587.56nm.

[0079] Therefore, it can be known that the optical imaging system of the first embodiment has better imaging quality.

[0080] See Table 1 and Table 2 for specific parameters of the optical imaging system of the first embodiment:

[0081] Table 1

[0082]

[0083]

[0084] The object side or image side of the optical imaging system lens can be an aspherical surface. The surface formula of the aspherical surface is:

[0085]

[0086] Wherein, Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex (at the optical axis), k is the cone constant, Ai is the coefficient corresponding to the i-th high-order term in the aspheric surface shape formula, see Table 2, which are the surface shape related parameters of each lens of the optical system of the first embodiment.

[0087] Table 2

[0088]

[0089]

[0090] Second embodiment

[0091] The optical imaging system of the second embodiment includes, arranged from the object side to the image side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture 110, a fifth lens L5, a sixth lens L6, a seventh lens L7, an infrared cut-off filter 120, and an imaging surface S18. The focal length f of the optical system is 0.94128 mm, the aperture FNO is 1.9°, the field of view FOV is 153.2°, and the total length TTL of the system is 7.459 mm.

[0092] The first lens L1 has negative refractive power and is made of plastic. On the optical axis, the object side S1 is convex in the paraxial area, and the image side S2 is concave in the paraxial area; on the circumference, the object side S1 is convex in the paraxial area, and the image side S2 is concave in the paraxial area; and both the object side S1 and the image side S2 are aspherical.

[0093] The second lens L2 has negative refractive power and is made of plastic. On the optical axis, the object side S3 paraxial area is convex, and the image side S4 paraxial area is concave; on the circumference, the object side S3 paraxial area is convex, and the image side S4 paraxial area is concave; and both the object side S3 and the image side S4 are aspherical.

[0094] The third lens L3 has positive refractive power and is made of plastic. On the optical axis, the object side S5 paraxial area is convex, and the image side S6 paraxial area is concave; on the circumference, the object side S5 paraxial area is convex, and the image side S6 paraxial area is concave; and both the object side S5 and the image side S6 are aspherical.

[0095] The fourth lens L4 has positive refractive power and is made of plastic. On the optical axis, the object side S7 paraxial region is convex, and the image side S8 paraxial region is concave; on the circumference, the object side S7 paraxial region is convex, and the image side S8 paraxial region is concave; and both the object side S7 and the image side S8 are aspherical.

[0096] The fifth lens L5 has positive refractive power and is made of plastic. Its object-side surface S10 paraxial region relative to the optical axis is convex, and its image-side surface S11 paraxial region is convex. Its object-side surface S10 paraxial region relative to the circumference is convex, and its image-side surface S11 paraxial region is concave. Both the object-side surface S10 and the image-side surface S11 are aspherical surfaces.

[0097] The sixth lens L6 has positive refractive power and is made of plastic. On the optical axis, the object side S12 paraxial region is convex, and the image side S13 paraxial region is convex; on the circumference, the object side S12 paraxial region is convex, and the image side S13 paraxial region is concave; and both the object side S12 and the image side S13 are aspherical.

[0098] The seventh lens L7 has negative refractive power and is made of plastic. On the optical axis, the object side S14 paraxial region is concave, and the image side S15 paraxial region is convex; on the circumference, the object side S14 paraxial region is convex, and the image side S15 paraxial region is convex; and both the object side S14 and the image side S15 are aspherical.

[0099] The infrared cut filter 120 is made of glass, and is disposed between the seventh lens L7 and the imaging surface S18 without affecting the focal length of the optical imaging system. The object side surface S16 and the image side surface S17 of the infrared cut filter are both spherical surfaces.

[0100] See below Figure 4A-4C , Figure 4A The spherical aberration curve of the optical imaging system of the second embodiment is shown, which indicates that light rays with different aperture angles intersect the optical axis at different points, and have different deviations relative to the ideal point, and the ordinate is the normalized field of view; Figure 4B 1 shows an astigmatism curve of the optical imaging system of the first embodiment, which represents the meridional image curvature and the sagittal image curvature, and the ordinate is the image height in mm; Figure 4C The distortion curve of the optical imaging system of the first embodiment is shown, which represents the distortion magnitude value under different viewing angles, and the ordinate is the image height in mm. Among them, the reference wavelength of astigmatism and distortion is 555nm, the units of Y radius and focal length are mm, the reference wavelength of focal length is 555nm, and the reference wavelength of refractive index and Abbe number is 587.56nm.

[0101] It can be seen from this that the optical imaging system of the second embodiment has better imaging quality.

[0102] See Table 3 and Table 4 for specific parameters of the optical imaging system of the second embodiment:

[0103] Table 3

[0104]

[0105] The object side or image side of the optical imaging system lens can be an aspherical surface. The surface formula of the aspherical surface is:

[0106]

[0107] Wherein, Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex (at the optical axis), k is the cone constant, Ai is the coefficient corresponding to the i-th high-order term in the aspheric surface shape formula, see Table 4, which are the surface shape related parameters of each lens of the optical system of the second embodiment.

[0108] Table 4

[0109]

[0110] Third embodiment

[0111] The optical imaging system of the third embodiment includes, arranged from the object side to the image side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture 110, a fifth lens L5, a sixth lens L6, a seventh lens L7, an infrared cut-off filter 120, and an imaging surface S18. The focal length f of the optical system is 0.939 mm, the aperture FNO is 1.96°, the field of view FOV is 152.4°, and the total length TTL of the system is 7.368 mm.

[0112] The first lens L1 has negative refractive power and is made of plastic. On the optical axis, the object side S1 is convex in the paraxial area, and the image side S2 is concave in the paraxial area; on the circumference, the object side S1 is convex in the paraxial area, and the image side S2 is concave in the paraxial area; and both the object side S1 and the image side S2 are aspherical.

[0113] The second lens L2 has negative refractive power and is made of plastic. On the optical axis, the object side S3 paraxial area is convex, and the image side S4 paraxial area is concave; on the circumference, the object side S3 paraxial area is convex, and the image side S4 paraxial area is convex; and both the object side S3 and the image side S4 are aspherical.

[0114] The third lens L3 has negative refractive power and is made of plastic. On the optical axis, the object side S5 paraxial area is convex, and the image side S6 paraxial area is concave; on the circumference, the object side S5 paraxial area is concave, and the image side S6 paraxial area is concave; and both the object side S5 and the image side S6 are aspherical.

[0115] The fourth lens L4 has positive refractive power and is made of plastic. On the optical axis, the object side S7 paraxial region is convex, and the image side S8 paraxial region is concave; on the circumference, the object side S7 paraxial region is convex, and the image side S8 paraxial region is concave; and both the object side S7 and the image side S8 are aspherical.

[0116] The fifth lens L5 has positive refractive power and is made of plastic. Its object-side surface S10 paraxial region relative to the optical axis is concave, and its image-side surface S11 paraxial region is convex. Its object-side surface S10 paraxial region is convex on the circumference, and its image-side surface S11 paraxial region is convex. Both the object-side surface S10 and the image-side surface S11 are aspherical surfaces.

[0117] The sixth lens L6 has positive refractive power and is made of plastic. On the optical axis, the object side S12 paraxial region is convex, and the image side S13 paraxial region is convex; on the circumference, the object side S12 paraxial region is concave, and the image side S13 paraxial region is convex; and both the object side S12 and the image side S13 are aspherical.

[0118] The seventh lens L7 has negative refractive power and is made of plastic. On the optical axis, the object side S14 paraxial region is concave, and the image side S15 paraxial region is convex; on the circumference, the object side S14 paraxial region is concave, and the image side S15 paraxial region is convex; and both the object side S14 and the image side S15 are aspherical.

[0119] The infrared cut filter 120 is made of glass, and is disposed between the seventh lens L7 and the imaging surface S18 without affecting the focal length of the optical imaging system. The object side surface S16 and the image side surface S17 of the infrared cut filter are both spherical surfaces.

[0120] See below Figures 5 to 6C , Fig. 6A The spherical aberration curve of the optical imaging system of the third embodiment is shown, which indicates that light rays with different aperture angles intersect the optical axis at different points, and have different deviations relative to the ideal point, and the ordinate is the normalized field of view; Figure 6B 1 shows an astigmatism curve of the optical imaging system of the first embodiment, which represents the meridional image curvature and the sagittal image curvature, and the ordinate is the image height in mm; Figure 6C The distortion curve of the optical imaging system of the first embodiment is shown, which represents the distortion magnitude value under different viewing angles, and the ordinate is the image height in mm. Among them, the reference wavelength of astigmatism and distortion is 555nm, the units of Y radius and focal length are mm, the reference wavelength of focal length is 555nm, and the reference wavelength of refractive index and Abbe number is 587.56nm.

[0121] It can be seen from this that the optical imaging system of the third embodiment has better imaging quality.

[0122] See Table 5 and Table 6 for specific parameters of the optical imaging system of the third embodiment:

[0123] Table 5

[0124]

[0125]

[0126] The object side or image side of the optical imaging system lens can be an aspherical surface. The surface formula of the aspherical surface is:

[0127]

[0128] Wherein, Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex (at the optical axis), k is the cone constant, Ai is the coefficient corresponding to the i-th high-order term in the aspheric surface shape formula, see Table 6, which are the surface shape related parameters of each lens of the optical system of the third embodiment.

[0129] Table 6

[0130]

[0131]

[0132] Fourth embodiment

[0133] The optical imaging system of the fourth embodiment includes, arranged from the object side to the image side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture 110, a fifth lens L5, a sixth lens L6, a seventh lens L7, an infrared cut-off filter 120, and an imaging surface S18. The focal length f of the optical system is 0.995 mm, the aperture FNO is 2°, the field of view FOV is 151.2°, and the total length TTL of the system is 7.483 mm.

[0134] The first lens L1 has negative refractive power and is made of plastic. On the optical axis, the object side S1 is convex in the paraxial area, and the image side S2 is concave in the paraxial area; on the circumference, the object side S1 is convex in the paraxial area, and the image side S2 is concave in the paraxial area; and both the object side S1 and the image side S2 are aspherical.

[0135] The second lens L2 has negative refractive power and is made of plastic. On the optical axis, the object side S3 is concave in the paraxial area, and the image side S4 is concave in the paraxial area; on the circumference, the object side S3 is convex in the paraxial area, and the image side S4 is convex in the paraxial area; and both the object side S3 and the image side S4 are aspherical.

[0136] The third lens L3 has positive refractive power and is made of plastic. On the optical axis, the object side S5 paraxial area is convex, and the image side S6 paraxial area is concave; on the circumference, the object side S5 paraxial area is concave, and the image side S6 paraxial area is concave; and both the object side S5 and the image side S6 are aspherical.

[0137] The fourth lens L4 has negative refractive power and is made of plastic. On the optical axis, the object side S7 paraxial area is convex, and the image side S8 paraxial area is concave; on the circumference, the object side S7 paraxial area is concave, and the image side S8 paraxial area is concave; and both the object side S7 and the image side S8 are aspherical.

[0138] The fifth lens L5 has positive refractive power and is made of plastic. Its object-side surface S10 paraxial region relative to the optical axis is convex, and its image-side surface S11 paraxial region is convex. Its object-side surface S10 paraxial region relative to the circumference is convex, and its image-side surface S11 paraxial region is convex. Both the object-side surface S10 and the image-side surface S11 are aspherical surfaces.

[0139] The sixth lens L6 has positive refractive power and is made of plastic. On the optical axis, the object side S12 paraxial region is convex, and the image side S13 paraxial region is convex; on the circumference, the object side S12 paraxial region is concave, and the image side S13 paraxial region is convex; and both the object side S12 and the image side S13 are aspherical.

[0140] The seventh lens L7 has positive refractive power and is made of plastic. On the optical axis, the object side S14 paraxial region is concave, and the image side S15 paraxial region is convex; on the circumference, the object side S14 paraxial region is convex, and the image side S15 paraxial region is concave; and both the object side S14 and the image side S15 are aspherical.

[0141] The infrared cut filter 120 is made of glass, and is disposed between the seventh lens L7 and the imaging surface S18 without affecting the focal length of the optical imaging system. The object side surface S16 and the image side surface S17 of the infrared cut filter are both spherical surfaces.

[0142] See below Figures 7 to 8C , Fig. 8A The spherical aberration curve of the optical imaging system of the fourth embodiment is shown, which indicates that light rays with different aperture angles intersect the optical axis at different points, and have different deviations relative to the ideal point, and the ordinate is the normalized field of view; Figure 8B 1 shows an astigmatism curve of the optical imaging system of the first embodiment, which represents the meridional image curvature and the sagittal image curvature, and the ordinate is the image height in mm; Figure 8C The distortion curve of the optical imaging system of the first embodiment is shown, which represents the distortion magnitude value under different viewing angles, and the ordinate is the image height in mm. Among them, the reference wavelength of astigmatism and distortion is 555nm, the units of Y radius and focal length are mm, the reference wavelength of focal length is 555nm, and the reference wavelength of refractive index and Abbe number is 587.56nm.

[0143] It can be seen from this that the optical imaging system of the fourth embodiment has better imaging quality.

[0144] The specific parameters of the optical imaging system of the fourth embodiment are shown in Table 7 and Table 8:

[0145] Table 7

[0146]

[0147]

[0148] The object side or image side of the optical imaging system lens can be an aspherical surface. The surface formula of the aspherical surface is:

[0149]

[0150] Wherein, Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex (at the optical axis), k is the cone constant, Ai is the coefficient corresponding to the i-th high-order term in the aspheric surface shape formula, see Table 8, which are the surface shape related parameters of each lens of the optical system of the fourth embodiment.

[0151] Table 8

[0152]

[0153] Fifth embodiment

[0154] The optical imaging system of the fifth embodiment includes, arranged in order from the object side to the image side: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture 110, a fifth lens L5, a sixth lens L6, a seventh lens L7, an infrared cut-off filter 120, and an imaging surface S18. The focal length f of the optical system is 0.986 mm, the aperture FNO is 1.85°, the field of view FOV is 151.6°, and the total length TTL of the system is 7.6 mm.

[0155] The first lens L1 has negative refractive power and is made of plastic. On the optical axis, the object side S1 is convex in the paraxial area, and the image side S2 is concave in the paraxial area; on the circumference, the object side S1 is convex in the paraxial area, and the image side S2 is concave in the paraxial area; and both the object side S1 and the image side S2 are aspherical.

[0156] The second lens L2 has negative refractive power and is made of plastic. On the optical axis, the object side S3 paraxial area is convex, and the image side S4 paraxial area is concave; on the circumference, the object side S3 paraxial area is convex, and the image side S4 paraxial area is concave; and both the object side S3 and the image side S4 are aspherical.

[0157] The third lens L3 has positive refractive power and is made of plastic. On the optical axis, the object side S5 paraxial area is convex, and the image side S6 paraxial area is concave; on the circumference, the object side S5 paraxial area is concave, and the image side S6 paraxial area is concave; and both the object side S5 and the image side S6 are aspherical.

[0158] The fourth lens L4 has negative refractive power and is made of plastic. On the optical axis, the object side S7 paraxial region is convex, and the image side S8 paraxial region is concave; on the circumference, the object side S7 paraxial region is convex, and the image side S8 paraxial region is concave; and both the object side S7 and the image side S8 are aspherical.

[0159] The fifth lens L5 has positive refractive power and is made of plastic. Its object-side surface S10 paraxial region relative to the optical axis is convex, and its image-side surface S11 paraxial region is convex. Its object-side surface S10 paraxial region relative to the circumference is convex, and its image-side surface S11 paraxial region is convex. Both the object-side surface S10 and the image-side surface S11 are aspherical surfaces.

[0160] The sixth lens L6 has positive refractive power and is made of plastic. On the optical axis, the object side S12 paraxial region is convex, and the image side S13 paraxial region is concave; on the circumference, the object side S12 paraxial region is convex, and the image side S13 paraxial region is convex; and both the object side S12 and the image side S13 are aspherical.

[0161] The seventh lens L7 has positive refractive power and is made of plastic. On the optical axis, the object side S14 paraxial region is convex, and the image side S15 paraxial region is convex; on the circumference, the object side S14 paraxial region is concave, and the image side S15 paraxial region is convex; and both the object side S14 and the image side S15 are aspherical.

[0162] The infrared cut filter 120 is made of glass, and is disposed between the seventh lens L7 and the imaging surface S18 without affecting the focal length of the optical imaging system. The object side surface S16 and the image side surface S17 of the infrared cut filter are both spherical surfaces.

[0163] See below Figures 9 to 10C , Fig. 10A The spherical aberration curve of the optical imaging system of the fifth embodiment is shown, which indicates that light rays with different aperture angles intersect the optical axis at different points, and have different deviations relative to the ideal point, and the ordinate is the normalized field of view; Fig. 10B 1 shows an astigmatism curve of the optical imaging system of the first embodiment, which represents the meridional image curvature and the sagittal image curvature, and the ordinate is the image height in mm; Fig. 10CThe distortion curve of the optical imaging system of the first embodiment is shown, which represents the distortion magnitude value under different viewing angles, and the ordinate is the image height in mm. Among them, the reference wavelength of astigmatism and distortion is 555nm, the units of Y radius and focal length are mm, the reference wavelength of focal length is 555nm, and the reference wavelength of refractive index and Abbe number is 587.56nm.

[0164] It can be seen from this that the optical imaging system of the fifth embodiment has better imaging quality.

[0165] The specific parameters of the optical imaging system of the fifth embodiment are shown in Table 9 and Table 10:

[0166] Table 9

[0167]

[0168] The object side or image side of the optical imaging system lens can be an aspherical surface. The surface formula of the aspherical surface is:

[0169]

[0170] Wherein, Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex (at the optical axis), k is the cone constant, Ai is the coefficient corresponding to the i-th high-order term in the aspheric surface shape formula, see Table 10, which are the surface shape related parameters of each lens of the optical system of the fifth embodiment.

[0171] Table 10

[0172]

[0173]

[0174] Sixth embodiment

[0175] The optical imaging system of the sixth embodiment includes, arranged from the object side to the image side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, an aperture 110, a fifth lens L5, a sixth lens L6, a seventh lens L7, an infrared cut-off filter 120, and an imaging surface S18. The focal length f of the optical system is 1.032 mm, the aperture FNO is 1.85°, the field of view FOV is 149.6°, and the total length TTL of the system is 7.6 mm.

[0176] The first lens L1 has negative refractive power and is made of plastic. On the optical axis, the object side S1 is convex in the paraxial area, and the image side S2 is concave in the paraxial area; on the circumference, the object side S1 is convex in the paraxial area, and the image side S2 is concave in the paraxial area; and both the object side S1 and the image side S2 are aspherical.

[0177] The second lens L2 has negative refractive power and is made of plastic. On the optical axis, the object side S3 paraxial area is convex, and the image side S4 paraxial area is concave; on the circumference, the object side S3 paraxial area is convex, and the image side S4 paraxial area is convex; and both the object side S3 and the image side S4 are aspherical.

[0178] The third lens L3 has positive refractive power and is made of plastic. On the optical axis, the object side S5 paraxial area is convex, and the image side S6 paraxial area is concave; on the circumference, the object side S5 paraxial area is concave, and the image side S6 paraxial area is concave; and both the object side S5 and the image side S6 are aspherical.

[0179] The fourth lens L4 has negative refractive power and is made of plastic. On the optical axis, the object side S7 paraxial area is concave, and the image side S8 paraxial area is concave; on the circumference, the object side S7 paraxial area is convex, and the image side S8 paraxial area is concave; and both the object side S7 and the image side S8 are aspherical.

[0180] The fifth lens L5 has positive refractive power and is made of plastic. Its object-side surface S10 paraxial region relative to the optical axis is convex, and its image-side surface S11 paraxial region is convex. Its object-side surface S10 paraxial region relative to the circumference is convex, and its image-side surface S11 paraxial region is concave. Both the object-side surface S10 and the image-side surface S11 are aspherical surfaces.

[0181] The sixth lens L6 has negative refractive power and is made of plastic. On the optical axis, the object side S12 paraxial region is convex, and the image side S13 paraxial region is concave; on the circumference, the object side S12 paraxial region is concave, and the image side S13 paraxial region is convex; and both the object side S12 and the image side S13 are aspherical.

[0182] The seventh lens L7 has positive refractive power and is made of plastic. On the optical axis, the object side S14 paraxial region is convex, and the image side S15 paraxial region is concave; on the circumference, the object side S14 paraxial region is concave, and the image side S15 paraxial region is convex; and both the object side S14 and the image side S15 are aspherical.

[0183] The infrared cut filter 120 is made of glass, and is disposed between the seventh lens L7 and the imaging surface S18 without affecting the focal length of the optical imaging system. The object side surface S16 and the image side surface S17 of the infrared cut filter are both spherical surfaces.

[0184] See below Fig.11 and Fig. 12C , Fig. 12AThe spherical aberration curve of the optical imaging system of the sixth embodiment is shown, which indicates that light rays with different aperture angles intersect the optical axis at different points, and have different deviations relative to the ideal point, and the ordinate is the normalized field of view; Fig. 12B 1 shows an astigmatism curve of the optical imaging system of the first embodiment, which represents the meridional image curvature and the sagittal image curvature, and the ordinate is the image height in mm; Fig. 12C The distortion curve of the optical imaging system of the first embodiment is shown, which represents the distortion magnitude value under different viewing angles, and the ordinate is the image height in mm. Among them, the reference wavelength of astigmatism and distortion is 555nm, the units of Y radius and focal length are mm, the reference wavelength of focal length is 555nm, and the reference wavelength of refractive index and Abbe number is 587.56nm.

[0185] It can be seen from this that the optical imaging system of the sixth embodiment has better imaging quality.

[0186] The specific parameters of the optical imaging system of the sixth embodiment are shown in Table 11 and Table 12:

[0187] Table 11

[0188]

[0189]

[0190] The object side or image side of the optical imaging system lens can be an aspherical surface. The surface formula of the aspherical surface is:

[0191]

[0192] Wherein, Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex (at the optical axis), k is the cone constant, Ai is the coefficient corresponding to the i-th high-order term in the aspheric surface shape formula, see Table 12, which are the surface shape related parameters of each lens of the optical system of the sixth embodiment.

[0193] Table 12

[0194]

[0195]

[0196] Table 13 shows the values ​​of tan(HFOV), FNO, sag11+sag12) / f1, TTL / sd11, f2345 / at2345, f67 / f, sag22 / sag31, and f2 / f of the optical systems of the first to sixth embodiments.

[0197] Table 13

[0198] tan(HFOV) FNO (sag11+sag12) / f1 TTL / SD11 First embodiment 4.15 1.90 0.96 2.38 Second embodiment 4.18 1.90 0.93 2.35 Third embodiment 4.06 1.96 1.00 2.24 Fourth embodiment 3.88 2.00 0.53 3.03 Fifth embodiment 3.94 1.85 0.80 2.61 Sixth embodiment 3.67 1.85 0.70 2.71 f2345 / at2345 f67 / f sag22 / sag31 f2 / f First embodiment 6.53 3.32 1.39 -2.40 Second embodiment 8.54 2.85 1.63 -2.28 Third embodiment 11.26 2.29 1.97 -4.47 Fourth embodiment 9.48 2.94 1.23 -1.77 Fifth embodiment 4.85 4.49 1.70 -2.08 Sixth embodiment 4.94 4.46 1.67 -1.94

[0199] It can be seen from Table 13 that all embodiments can satisfy the following conditions: tan(HFOV)>3.5, FNO≤2.2, 0.5<(sag11+sag12) / f1<1.2, 2 <TTL / sd11<3.2,4<f2345 / at2345<12,2<f67 / f<5,1<sag22 / sag31<2,1.5<-f2 / f<4.5。

[0200] The imaging device according to the second aspect of the present invention includes the optical system of the above-mentioned embodiment. The imaging device can be a lens module, or an electronic device with a lens module, such as a mobile phone, a computer, etc. The imaging device can have an electronic photosensitive element, and the electronic photosensitive element is arranged on the imaging surface of the optical imaging system. Through the integrated arrangement of the optical imaging system and the electronic photosensitive element, the image formed by the optical imaging system can be collected and transmitted to the imaging device through the electronic sensing element, thereby realizing the imaging of the imaging device.

[0201] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0202] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An optical imaging system, characterized in that: There are seven lenses with refractive power, including the following, arranged coaxially from the object side to the image side: The first lens has negative refractive power, and the object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis; The second lens has negative refractive power and its image side surface is concave at the near optical axis; The third lens has refractive power, and its object side surface is convex at the near optical axis, and its image side surface is concave at the near optical axis; The fourth lens has refractive power and its image side surface is concave at the near optical axis; The fifth lens has positive refractive power and its image side surface is convex at the near optical axis; The sixth lens has refractive power and the object side surface is convex near the optical axis; The seventh lens has a refractive power, and both the object side surface and the image side surface are aspherical surfaces; FNO≤2.2, where FNO is the aperture number of the optical imaging system.

2. The optical imaging system according to claim 1, characterized in that: tan(HFOV)>3.5; Wherein, HFOV is half of the maximum field of view of the optical imaging system.

3. The optical imaging system according to claim 1, characterized in that: 0.5<(sag11+sag12) / f1<1.2; Wherein, sag11 is the on-axis distance from the intersection of the object side surface of the first lens and the optical axis to the maximum effective radius of the object side surface of the first lens; sag12 is the on-axis distance from the intersection of the image side surface of the first lens and the optical axis to the maximum effective radius of the image side surface of the first lens.

4. The optical imaging system according to claim 1, characterized in that: 2 <TTL / sd11<3.2; Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the near optical axis; sd11 is the maximum effective radius of the object side of the first lens.

5. The optical imaging system according to claim 1, characterized in that: 4 <f2345 / at2345<12; Where f2345 is the combined effective focal length of the second, third, fourth, and fifth lenses; at2345 is the sum of the air spaces between adjacent lenses of the second, third, fourth and fifth lenses.

6. The optical imaging system according to claim 1, characterized in that: 2 <f67 / f<5; Wherein, f67 is the combined effective focal length of the sixth lens and the seventh lens; f is the effective focal length of the optical imaging system.

7. The optical imaging system according to claim 1, characterized in that: 1 <sag22 / sag31<2; Wherein, sag22 is the on-axis distance from the intersection of the image side surface of the second lens and the optical axis to the maximum effective radius of the image side surface of the second lens; sag31 is the on-axis distance from the intersection of the object side surface of the third lens and the optical axis to the maximum effective radius of the object side surface of the third lens.

8. The optical imaging system according to claim 1, characterized in that: 1.5<-f2 / f<4.5; Wherein, f2 is the effective focal length of the second lens, and f is the effective focal length of the optical imaging system.

9. An imaging device, characterized in that: Comprising the optical system as claimed in any one of claims 1 to 8.

Images