CN211826697U - Optical imaging system, image capturing module and electronic device - Google Patents
Optical imaging system, image capturing module and electronic device Download PDFInfo
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- CN211826697U CN211826697U CN202020707375.2U CN202020707375U CN211826697U CN 211826697 U CN211826697 U CN 211826697U CN 202020707375 U CN202020707375 U CN 202020707375U CN 211826697 U CN211826697 U CN 211826697U
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Abstract
The utility model provides an optical imaging system, get for instance module and electron device, optical imaging system includes by the thing side to picture side in proper order: a first lens element with negative refractive power; a second lens element with refractive power; a third lens element with positive refractive power; a fourth lens element with refractive power; a fifth lens element with negative refractive power; and a sixth lens element with positive refractive power. The optical imaging system satisfies the following conditional expression: the FOV/f is more than 87.0 degrees/mm and less than or equal to 128.0 degrees/mm; wherein FOV is the maximum field angle of the optical imaging system, and f is the effective focal length of the optical imaging system. The utility model discloses optical imaging system, get for instance module and electron device, through the configuration of above-mentioned reasonable refractive power, make optical imaging system have wide visual angle and better imaging quality simultaneously.
Description
Technical Field
The utility model relates to an optical imaging technique, in particular to optical imaging system, get for instance module and electron device.
Background
At present, wide-angle optical cameras are widely introduced in smart phones and smart electronic devices. The problem of significant distortion of the field of view at the edges of the wide-angle lens has raised concerns for both the consumer and the end manufacturer. In the process of implementing the present invention, the inventor finds that there are at least the following problems in the prior art: the larger the angle of view of the optical pick-up lens is, the more obvious the edge distortion is, and the imaging quality is influenced. How to make an optical camera lens have a wide viewing angle and a good imaging quality at the same time is a problem that needs to be solved urgently by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is desirable to provide an optical imaging system, an image capturing module and an electronic device to solve the above problems.
An embodiment of the present application provides an optical imaging system, sequentially from an object side to an image side, comprising:
a first lens element with negative refractive power;
a second lens element with refractive power;
a third lens element with positive refractive power;
a fourth lens element with refractive power;
a fifth lens element with negative refractive power; and
a sixth lens element with positive refractive power;
the optical imaging system satisfies the following conditional expression:
87.0°/mm＜FOV/f≤128.0°/mm；
wherein FOV is the maximum field angle of the optical imaging system, and f is the effective focal length of the optical imaging system.
Satisfying the above formula, the optical imaging system can provide a field angle of over 120 ° to effectively increase the viewing area of the picture. Furthermore, the field angle can reach 134.4 degrees, the effective focal length is reduced, and the device has certain microspur capability while accommodating more image capturing areas. The utility model discloses optical imaging system can promote optical imaging system to the trapping ability of low frequency detail through the configuration of reasonable refractive power, effectively reduces marginal visual field distortion, promotes the diaphragm number, has realized wide visual angle and higher imaging quality simultaneously.
In some embodiments, the first lens element has a concave object-side surface and a concave image-side surface;
the object side surface of the second lens is a convex surface at the optical axis, and the image side surface of the second lens is a concave surface at the optical axis;
the object side surface of the third lens is a convex surface at the optical axis, and the image side surface of the third lens is a convex surface at the optical axis;
the object side surface of the fourth lens is a concave surface at the optical axis, and the image side surface of the fourth lens is a convex surface at the optical axis;
the object side surface of the fifth lens is a concave surface on the circumference, the image side surface of the fifth lens is a concave surface on the circumference, and both the object side surface and the image side surface are aspheric surfaces;
the object side surface of the sixth lens element is a convex surface at the optical axis, the image side surface of the sixth lens element is a concave surface at the optical axis, both the object side surface and the image side surface of the sixth lens element are aspheric, and at least one of the object side surface and the image side surface of the sixth lens element is provided with at least one inflection point.
The utility model discloses optical imaging system is through reasonable camera lens configuration, and working range is wide, has reduced optical imaging system's size when keeping good optical property, has realized optical imaging system's miniaturization.
In some embodiments, the optical imaging system further comprises a diaphragm disposed between the second lens and the third lens.
The diaphragm is used for reducing stray light and is beneficial to improving the image quality, and the diaphragm is arranged between the second lens and the third lens, so that possibility is provided for realizing a large visual angle, the structure of the optical imaging system is symmetrical to a certain extent, and the optical distortion is well controlled.
In some embodiments, the optical imaging system satisfies the following conditional expression:
4.5＜SD1/CT12＜16.5；
the SD1 is the vertical distance from the edge of the optically effective area of the object side surface of the first lens to the optical axis, and the CT12 is the distance between the image side surface of the first lens and the object side surface of the second lens on the optical axis.
The SD1 is effectively compressed, the size of the head of the optical imaging system 10 can be reduced, the width of the optical imaging system perpendicular to the optical axis direction is reduced, the overall volume is compressed to a greater extent by matching with the reduction of the CT12, the compactness is improved, the miniaturization is realized, and the ghost risk is reduced; meanwhile, the arrangement difficulty of the structure is reduced, and the assembly forming yield is improved.
In some embodiments, the optical imaging system satisfies the following conditional expression:
2.0％＜|DIS/FNO|＜8.0％；
wherein DIS is a maximum value of optical distortion of the optical imaging system, and FNO is an f-number of the optical imaging system.
Satisfying the above formula, the f-number FNO can be increased, and the field angle of over 120 ° can be obtained at the same time, and in this case, the overall structure of the optical imaging system is reasonably controlled, so that the optical distortion is small, and thus, the distortion of the wide-angle shooting edge can be weakened, and better image quality can be obtained.
In some embodiments, the optical imaging system satisfies the following conditional expression:
CT45/ET5＜0.30；
wherein CT45 is an axial distance between an image-side surface of the fourth lens element and an object-side surface of the fifth lens element, and ET5 is a thickness of an optically effective area edge of the fifth lens element.
The fourth lens element and the fifth lens element are matched to form a certain matching shape, the fifth lens element has negative refractive power, the fourth lens element has refractive power, the fourth lens element and the fifth lens element are matched to achieve a good chromatic aberration correction effect and a good spherical aberration correction effect, and the resolving power of the optical imaging system can be improved. In addition, the reduction in size provides the convenience of increasing the compactness of the system and compressing the optical length.
In some embodiments, the optical imaging system satisfies the following conditional expression:
0.2＜SAG62/R61＜0.5；
wherein SAG62 is the maximum rise of the image-side surface of the sixth lens, and R61 is the radius of curvature of the object-side surface of the sixth lens at the optical axis.
The wavy lens structure of the sixth lens provides good refractive power distribution for the direction perpendicular to the optical axis, provides good transition for marginal field rays to enter an image plane, reduces the angle of incidence of the image plane, is favorable for improving the relative brightness on the image plane, and reduces the tolerance sensitivity of the lens.
In some embodiments, the optical imaging system satisfies the following conditional expression:
20.0＜|R41/ET4|＜71.5；
wherein R41 is a radius of curvature of an object-side surface of the fourth lens at an optical axis, and ET4 is a thickness of an optically effective area edge of the fourth lens.
The surface type and the thickness of the fourth lens are changed, so that the light rays contracted by the first lens and the second lens are gradually diffused at the fourth lens, and the phenomenon that the light rays are deflected too much to cause sensitivity increase is avoided.
In some embodiments, the optical imaging system satisfies the following conditional expression:
0.35＜(CT1+CT2)/SD1＜0.5；
wherein CT1 is a thickness of the first lens element along the optical axis, CT2 is a thickness of the second lens element along the optical axis, and SD1 is a perpendicular distance from an edge of the effective area of the object side of the first lens element to the optical axis.
Satisfying the above formula, the reduction of CT1 and CT2 can reduce SD1, further reduce the size of the head of the optical imaging system, reduce the optical length of the optical imaging system, and facilitate the molding and manufacturing.
In some embodiments, the optical imaging system satisfies the following conditional expression:
1.2≤(CT3+CT4+CT5)/BF＜2.4；
wherein CT3 is a thickness of the third lens element, CT4 is a thickness of the fourth lens element, CT5 is a thickness of the fifth lens element, and BF is a minimum distance between an image side surface of the sixth lens element and an image plane in a direction parallel to the optical axis.
The above formula is satisfied, and sufficient matching space between the optical imaging system and the photosensitive chip can be ensured, thereby being beneficial to the improvement of assembly yield. Meanwhile, the reasonable arrangement of the CT3, the CT4 and the CT5 can reduce the optical length, contribute to the formation of structural symmetry and reduce optical distortion.
In some embodiments, the optical imaging system satisfies the following conditional expression:
0.85＜TTL/(ImgH*2)＜1.1
wherein, TTL is a distance on an optical axis from an object-side surface of the first lens element to an imaging surface, and ImgH is a half of a length of a diagonal line of an effective imaging area of the optical imaging system on the imaging surface.
The optical total length can be reduced, the structure of the optical imaging system is more compact, the thickness distribution of the lens is reasonable, and the forming and assembling are facilitated; the ImgH can be increased appropriately to support a chip with a large image plane size.
An embodiment of the present invention provides an image capturing module, including the optical imaging system of any embodiment; and the photosensitive element is arranged on the image side of the optical imaging system.
The utility model discloses get for instance the module and include optical imaging system, optical imaging system can promote optical imaging system to the catching ability of low frequency detail through the configuration of reasonable refractive power, effectively reduces marginal visual field distortion, promotes the diaphragm number, has realized wide visual angle and higher imaging quality simultaneously.
An embodiment of the utility model provides an electronic device, include: the casing with the module of getting for instance of above-mentioned embodiment, get for instance the module and install on the casing.
The utility model discloses electronic device is including getting for instance the module, through the configuration of reasonable refractive power, can promote the optical imaging system to the catching ability of low frequency detail, effectively reduces marginal visual field distortion, promotes the f-number, has realized wide visual angle and higher imaging quality simultaneously.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of an optical imaging system according to a first embodiment of the present invention.
Fig. 2 is a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical imaging system in the first embodiment of the present invention.
Fig. 3 is a schematic structural diagram of an optical imaging system according to a second embodiment of the present invention.
Fig. 4 is a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical imaging system in the second embodiment of the present invention.
Fig. 5 is a schematic structural diagram of an optical imaging system according to a third embodiment of the present invention.
Fig. 6 is a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical imaging system in the third embodiment of the present invention.
Fig. 7 is a schematic structural diagram of an optical imaging system according to a fourth embodiment of the present invention.
Fig. 8 is a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical imaging system according to the fourth embodiment of the present invention.
Fig. 9 is a schematic structural diagram of an optical imaging system according to a fifth embodiment of the present invention.
Fig. 10 is a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical imaging system according to the fifth embodiment of the present invention.
Fig. 11 is a schematic structural diagram of an optical imaging system according to a sixth embodiment of the present invention.
Fig. 12 is a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of an optical imaging system according to a sixth embodiment of the present invention.
Fig. 13 is a schematic structural diagram of an optical imaging system according to a seventh embodiment of the present invention.
Fig. 14 is a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical imaging system according to the seventh embodiment of the present invention.
Fig. 15 is a schematic structural diagram of an image capturing module according to an embodiment of the present invention.
Fig. 16 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Description of the main elements
First lens L1
Second lens L2
Third lens L3
Fourth lens L4
Fifth lens L5
Sixth lens L6
Infrared filter L7
Stop STO
Object sides S1, S3, S5, S7, S9, S11, S13
Like sides S2, S4, S6, S8, S10, S12, S14
Image plane S15
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or reference letters in the various examples, which have been repeated for purposes of simplicity and clarity and do not in themselves dictate a relationship between the various embodiments and/or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
Referring to fig. 1, the optical imaging system 10 of the present invention includes, in order from an object side to an image side, a first lens element L1 with negative refractive power, a second lens element L2 with refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with refractive power, a fifth lens element L5 with negative refractive power, and a sixth lens element L6 with positive refractive power.
The first lens L1 has an object-side surface S1 and an image-side surface S2, the second lens L2 has an object-side surface S3 and an image-side surface S4, the third lens L3 has an object-side surface S5 and an image-side surface S6, the fourth lens L4 has an object-side surface S7 and an image-side surface S8, the object-side surface S7 is concave on the optical axis, the fifth lens L5 has an object-side surface S9 and an image-side surface S10, and the sixth lens L6 has an object-side surface S11 and an image-side surface S12. The optical imaging system 10 satisfies the following relationship:
87.0°/mm＜FOV/f≤128.0°/mm；
where FOV is the maximum field angle of the optical imaging system 10, and f is the effective focal length of the optical imaging system 10, that is, FOV/f can be any value within the range of (87 °/mm, 128 °/mm), for example, 124.07 °/mm, 91.68 °/mm, 117.94 °/mm, 87.86 °/mm, 106.56 °/mm, 120.55 °/mm, 128 °/mm, and so on.
In the optical imaging system 10 of the embodiment of the present application, through the above configuration of reasonable refractive power, the requirement of the optical imaging system 10 for a wide angle is met, the capturing capability of the optical imaging system 10 for low-frequency details is improved, the distortion of the edge field of view is effectively reduced, the f-number is improved, and the optical imaging system 10 can be ensured to have better imaging quality.
Satisfying the above formula, the optical imaging system 10 can provide a field angle of over 120 ° to effectively increase the viewing area of the screen. Furthermore, the field angle can reach 134.4 degrees, the effective focal length is reduced, and the device has certain microspur capability while accommodating more image capturing areas; for example, the focusing object distance can reach 50 mm; through reasonable refractive power configuration, the capturing capability of the system on low-frequency details can be improved, and the design requirement of high image quality is met.
In some embodiments, the object-side surface S1 of the first lens L1 is concave at the optical axis, and the image-side surface S2 is concave at the optical axis; the object-side surface S3 of the second lens element L2 is convex along the optical axis, and the image-side surface S4 is concave along the optical axis; the object-side surface S5 of the third lens element L3 is convex along the optical axis, and the image-side surface S6 is convex along the optical axis; the image-side surface S8 of the fourth lens element L4 is convex at the optical axis; the object-side surface S9 of the fifth lens element L5 is concave at the circumference, the image-side surface S10 is concave at the circumference, and both the object-side surface S9 and the image-side surface S10 are aspheric; the object-side surface S11 of the sixth lens element L6 is convex along the optical axis, the image-side surface S12 is concave along the optical axis, both the object-side surface S11 and the image-side surface S12 are aspheric, and at least one of the object-side surface S11 and the image-side surface S12 has at least one inflection point.
The optical imaging system 10 has a wide working range through reasonable lens configuration, reduces the size of the optical imaging system 10 while maintaining good optical performance, and realizes miniaturization of the optical imaging system 10.
In some embodiments, the optical imaging system 10 further includes a stop STO. The stop STO may be disposed before the first lens L1, after the sixth lens L6, between any two lenses, or on the surface of any one lens, or disposed on the surface of any one lens. The stop STO is used to reduce stray light, which is helpful to improve image quality.
Preferably, the stop STO is a center stop, for example, in fig. 1, the stop STO is disposed between the second lens L2 and the third lens L3, thereby providing a possibility of a large angle of view. Moreover, the central diaphragm makes the structure of the optical imaging system 10 in a certain symmetry, so that the optical distortion is better controlled.
In some embodiments, optical imaging system 10 further includes an infrared filter L7, infrared filter L7 having an object side S13 and an image side S14. The infrared filter L7 is disposed on the image-side surface S12 of the sixth lens element L6 to filter out light in other wavelength bands, such as visible light, and only let infrared light pass through, so that the optical imaging system 10 can also image in a dark environment and other special application scenarios.
When the optical imaging system 10 is used for imaging, light rays emitted or reflected by a subject enter the optical imaging system 10 from the object side direction, sequentially pass through the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6, and finally converge on the image surface S15.
In some embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all made of plastic.
In some embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all aspheric lenses.
In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:
4.5＜SD1/CT12＜16.5；
wherein SD1 is the vertical distance from the edge of the optically effective area of the object-side surface S1 of the first lens L1 to the optical axis, and represents the size of the head of the optical imaging system 10, which affects the structural arrangement and the assembly yield; CT12 is the distance between the image side surface S2 of the first lens L1 and the object side surface S3 of the second lens L2 on the optical axis, that is, SD1/CT12 may have any value in the range of (4.5,16.5), for example, 16.38, 5.59, 6.28, 8.19, 4.80, 5.18, 8.67, and the like.
The SD1 is effectively compressed, the size of the head of the optical imaging system 10 can be reduced, the width of the optical imaging system 10 perpendicular to the optical axis direction is reduced, the overall volume is compressed to a greater extent by matching with the reduction of the CT12, the compactness is improved, the miniaturization is realized, and the ghost risk is reduced; meanwhile, the arrangement difficulty of the structure is reduced, and the assembly forming yield is improved. When CT12 is greater than 0.3, the thickness of the first lens L1 and SD1 are difficult to control within a reasonable range due to the rapid reduction of the deflection angle of the incident second lens L2, and the possibility of structural arrangement is lost if SD1 is too large, while satisfying the FOV requirement.
In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:
2.0％＜|DIS/FNO|＜8.0％；
where DIS is the maximum value of the optical distortion of the optical imaging system 10, and FNO is the f-number of the optical imaging system 10, that is, | DIS/FNO | can be any value in the range of (2.0%, 8.0%), for example, 6.83%, 3.64%, 7.89%, 7.05%, 5.89%, 2.12%, 6.98%, etc.
The arrangement of the middle diaphragm makes the structure of the optical imaging system 10 in certain symmetry, and the optical distortion is better controlled. The FNO and the diffraction limit are in positive correlation with the Airy spots, the formula is satisfied, the system can obtain a large aperture effect, and a visual field angle of over 120 degrees is obtained, under the condition, the whole structure of the system is reasonably controlled, so that the optical distortion is less than 15%, and the minimum DIS reaches 5%; therefore, the distortion of the wide-angle shooting edge can be weakened; moreover, FNO is less than 1.9, the system diffraction limit is further improved, and a higher optical transfer function value and better image quality can be obtained by matching with a good lens surface type and a good refractive power configuration. Therefore, the distortion of the wide-angle shooting edge can be weakened, and better image quality can be obtained.
In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:
CT45/ET5＜0.30；
here, CT45 is the distance between the image-side surface S8 of the fourth lens element L4 and the object-side surface S9 of the fifth lens element L5 on the optical axis, and ET5 is the thickness of the edge of the optically effective area of the fifth lens element L5, that is, CT45/ET5 may be any value less than 0.30, for example, 0.22, 0.08, 0.05, 0.27, 0.26, 0.19, 0.20, and the like. When CT45 is greater than 0.15, the fifth lens L5 can provide marginal rays with proper deflection angles, and the shape of the image side surface S8 can be complicated and introduce more aberrations. Satisfying the above formula, the fourth lens L4 and the fifth lens L5 form a certain fitting shape, and can reduce the axial dimension, thereby facilitating the compactness of the system and the compression of the optical length. CT45 is less than 0.11, the fourth lens L4 and the fifth lens L5 are matched in a C shape, the smaller the distance between the two lenses is, the closer the two lenses are to the cemented lens, the fifth lens L5 has negative refractive power, the fourth lens L4 has positive or negative refractive power, the matching of the high and low refractive indexes of the fourth lens L4 and the fifth lens L5 has a very good correcting effect on chromatic aberration, and simultaneously has a good correcting effect on spherical aberration, and the good refractive power setting can improve the resolving power of the system.
In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:
0.2＜SAG62/R61＜0.5；
the SAG62 is the maximum rise of the image side surface S12 of the sixth lens L6, and the R61 is the radius of curvature of the object side surface S11 of the sixth lens L6 on the optical axis, that is, the SAG62/R61 may be any value in the range of (0.2,0.5), for example, 0.44, 0.42, 0.30, 0.22, 0.32, 0.31, 0.46. The rise is the distance from the projection of the edge of the effective area on the image side surface of the lens on the optical axis to the intersection point of the image side surface of the lens and the optical axis.
Satisfying the above formula, the waved lens structure of the sixth lens element L6 provides good refractive power distribution in the direction perpendicular to the optical axis, provides good transition for marginal field rays to enter the image plane S15, reduces the angle of incidence of the image plane, is beneficial to improving the relative brightness on the image plane S15, and reduces the tolerance sensitivity of the lens.
In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:
20.0＜|R41/ET4|＜71.5；
where R41 is a curvature radius of the object-side surface S7 of the fourth lens L4 at the optical axis, and ET4 is a thickness of an optically effective area edge of the fourth lens L4, that is, | R41/ET4| may be any value in a range of (20.0,71.5), for example, 27.33, 11.41, 20.56, 33.92, 28.43, 13.74, 71.20, and so on.
Satisfying the above formula, the surface shape and thickness of the fourth lens L4 are changed, so that the light beam contracted by the first lens L1 and the second lens L2 is gradually diffused at the fourth lens L4, and the light beam is prevented from deflecting too much, which causes the sensitivity to increase. In some embodiments, ET4<0.27, which allows the fourth lens element L4 to form a meniscus shape with varying refractive power, a small amount of primary aberration introduced into the object-side surface, and an introduced amount of image-side aberration that can be used with other lens elements to correct the overall aberration; the reasonable refractive power configuration can improve the image quality of the system. If ET4 is greater than 0.3, the shape of the object-side surface S7 of the fourth lens L4 tends to be flat, and the deflection capability of the edge light is reduced, so that the edge field performance is difficult to improve; if ET is less than 0.1, the thickness-to-thickness ratio in the fourth lens L4 is difficult to balance, which tends to increase the manufacturing difficulty.
In some embodiments, the optical imaging system satisfies the following conditional expression:
0.35＜(CT1+CT2)/SD1＜0.5；
wherein CT1 is the thickness of the first lens element L1 on the optical axis, CT2 is the thickness of the second lens element L2 on the optical axis, and SD1 is the perpendicular distance between the edge of the effective region of the object-side surface S1 of the first lens element L1 and the optical axis, that is, (CT1+ CT2)/SD1 can be any value within the range of (0.25,0.5), for example, 0.46, 0.44, 0.39, 0.61, 0.44, 0.38, 0.40, etc.
Satisfying the above formula, the reduction of CT1 and CT2 can reduce SD1, further reduce the size of the head of the optical imaging system 10, reduce the optical length of the optical imaging system 10, and facilitate the molding and manufacturing. In some embodiments, 0.2 < CT ≦ 0.55. If CT1 is greater than 0.55, SD1 can be caused to be greater than 1.9, at this time, the effective diameter of the first lens L1 is equal to or greater than that of the sixth lens L6, and has a larger difference with the effective diameters of the second lens L2 and the third lens L3, which increases the difficulty of lens bearing and lens barrel structure arrangement, and the aperture of the light incident end and the volume of the lens module are larger, thus being not beneficial to miniaturization development; if CT1 is less than 0.2, the curvature of the edge of the first lens L1 increases, the edge thickness further increases, and it is difficult to maintain the appropriate thickness-to-thickness ratio of the lens.
In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:
1.2≤(CT3+CT4+CT5)/BF＜2.4；
wherein CT3 is the thickness of the third lens L3 on the optical axis, CT4 is the thickness of the fourth lens L4 on the optical axis, CT5 is the thickness of the fifth lens L5 on the optical axis, and BF is the minimum distance between the image side surface S12 of the sixth lens L6 and the image surface S15 in the direction parallel to the optical axis.
Wherein BF is more than or equal to 0.55, if BF is less than 0.55, it is difficult to provide proper matching and gap adjustment between the lens and the photosensitive chip; CT3 is less than 0.52, CT4 is less than 0.6, and the third lens L3, the fourth lens L4 and the fifth lens L5 can keep proper medium thickness, so that the complexity of the surface form is prevented from being improved, and the grinding tool is favorably manufactured and injection molded; if CT3 > 0.55 and CT4 > 0.6, it is difficult to maintain a small TTL due to the increase in size, which is not favorable for maintaining the lightweight and thin characteristics of the system. The ratio (CT3+ CT4+ CT5)/BF may be any value within the range of [1.2,2.4 ], for example, 1.93, 2.13, 2.16, 1.2, 1.82, 2.33, 1.97, etc.
The above formula is satisfied, so that the sufficient matching space between the optical imaging system 10 and the photosensitive chip can be ensured, and the improvement of the assembly yield is facilitated. Meanwhile, the reasonable arrangement of the CT3, the CT4 and the CT5 can reduce the optical length, contribute to the formation of structural symmetry and reduce optical distortion.
In some embodiments, the optical imaging system 10 satisfies the following conditional expressions:
0.85＜TTL/(ImgH*2)＜1.1
wherein, TTL is a distance from the object-side surface S1 of the first lens element L1 to the image plane on the optical axis, ImgH is a half of a diagonal length of an effective imaging area of the optical imaging system on the image plane, that is, TTL/(ImgH × 2) may be any value within a range of (0.85,1.1), for example, 0.89, 1.00, 0.97, 1.02, 0.96, 1.03, 0.95, etc.
The optical total length can be reduced, so that the structure of the optical imaging system 10 is more compact, the thickness distribution of the lens is reasonable, and the forming and assembling are facilitated; the ImgH can be increased appropriately to support a chip with a large image plane size. When the condition that TTL/(ImgH x 2) < 1.0 is satisfied, the optical imaging system 10 has good thickness and volume, and at the moment, the conflict between the performance of the optical imaging system 10 and TTL is avoided, so that the performance of the optical system is favorably improved, and the light and thin characteristic is kept; the ImgH can be increased appropriately to support a chip with a large image plane size. If TTL/(ImgH 2) < 0.75, the performance improvement of TTL and the material is limited, and the manufacturing cost is greatly increased by increasing the material with high refractive index; if TTL/(ImgH × 2) > 1.4, it is not favorable for the optical imaging system 10 to be light and thin due to higher TTL.
In some embodiments, at least one surface of at least one lens in the optical imaging system 10 is aspheric. For example, in the first embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 in the optical imaging system 10 are all aspheric.
The aspherical surface has a surface shape determined by the following formula:
wherein Z is the longitudinal distance between any point on the aspheric surface and the surface vertex, r is the distance between any point on the aspheric surface and the optical axis, the vertex curvature (the reciprocal of the curvature radius) of c, k is a conic constant, and Ai is the correction coefficient of the i-th order of the aspheric surface.
In this way, the optical imaging system 10 can effectively reduce the size of the optical imaging system 10, effectively correct aberration, and improve imaging quality by adjusting the curvature radius and aspheric coefficients of each lens surface.
First embodiment
Referring to fig. 1 and 2, the optical imaging system 10 of the first embodiment includes, in order from an object side to an image side, a first lens element L1 with negative refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with negative refractive power, a fifth lens element L5 with negative refractive power, and a sixth lens element L6 with positive refractive power.
The object-side surface S1 of the first lens element L1 is concave along the optical axis, and the image-side surface S2 is concave along the optical axis; the object-side surface S3 of the second lens element L2 is convex along the optical axis, and the image-side surface S4 is concave along the optical axis; the object-side surface S5 of the third lens element L3 is convex along the optical axis, and the image-side surface S6 is convex along the optical axis; the object-side surface S7 of the fourth lens element L4 is concave along the optical axis, and the image-side surface S8 is convex along the optical axis; the object-side surface S9 of the fifth lens element L5 is convex along the optical axis, the image-side surface S10 is concave along the optical axis, and both the object-side surface S9 and the image-side surface S10 are aspheric; the object-side surface S11 of the sixth lens element L6 is convex along the optical axis, the image-side surface S12 is concave along the optical axis, both the object-side surface S11 and the image-side surface S12 are aspheric, and at least one of the object-side surface S11 and the image-side surface S12 has at least one inflection point.
The object-side surface S1 of the first lens element L1 is convex at the circumference, and the image-side surface S2 is concave at the circumference; the object-side surface S3 of the second lens element L2 is convex at the circumference, and the image-side surface S4 is concave at the circumference; the object-side surface S5 of the third lens element L3 is concave at the circumference, and the image-side surface S6 is convex at the circumference; the object-side surface S7 of the fourth lens element L4 is concave at the circumference, and the image-side surface S8 is convex at the circumference; the object-side surface S9 of the fifth lens element L5 is concave at the circumference, and the image-side surface S10 is concave at the circumference; the object-side surface S11 of the sixth lens element L6 is concave at the circumference, and the image-side surface S12 is convex at the circumference.
The stop STO is disposed between the second lens L2 and the third lens L3.
In the first embodiment, the field angle FOV of the optical imaging system is 134.0 °, the effective focal length f is 1.08mm, FOV/f is 124.07 °/mm, SD1/CT12 is 16.38, | DIS/FNO | 6.83%, CT45/ET5 is 0.22, SAG62/R61 is 0.44, | R41/ET4| 27.33, (CT1+ CT2)/SD1 is 0.46, (CT3+ CT4+ CT5)/BF 5 is 1.93, and/(ImgH 2) is 0.89.
The reference wavelength in the first embodiment is 587nm, and the optical imaging system 10 in the first embodiment satisfies the conditions of the following table.
TABLE 1
It should be noted that EFL is an effective focal length of the optical imaging system 10, FNO is an f-number of the optical imaging system 10, FOV is a field angle of the optical imaging system 10, and TTL is a distance from the object-side surface S1 of the first lens L1 to the imaging surface on the optical axis.
TABLE 2
Second embodiment
Referring to fig. 3 and 4, the optical imaging system 10 of the second embodiment includes, in order from an object side to an image side, a first lens element L1 with negative refractive power, a second lens element L2 with positive refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, and a sixth lens element L6 with positive refractive power.
The object-side surface S1 of the first lens element L1 is concave along the optical axis, and the image-side surface S2 is concave along the optical axis; the object-side surface S3 of the second lens element L2 is convex along the optical axis, and the image-side surface S4 is concave along the optical axis; the object-side surface S5 of the third lens element L3 is convex along the optical axis, and the image-side surface S6 is convex along the optical axis; the object-side surface S7 of the fourth lens element L4 is concave along the optical axis, and the image-side surface S8 is convex along the optical axis; the object-side surface S9 of the fifth lens element L5 is concave along the optical axis, the image-side surface S10 is concave along the optical axis, and both the object-side surface S9 and the image-side surface S10 are aspheric; the object-side surface S11 of the sixth lens element L6 is convex along the optical axis, the image-side surface S12 is concave along the optical axis, both the object-side surface S11 and the image-side surface S12 are aspheric, and at least one of the object-side surface S11 and the image-side surface S12 has at least one inflection point.
The object-side surface S1 of the first lens element L1 is convex at the circumference, and the image-side surface S2 is concave at the circumference; the object-side surface S3 of the second lens element L2 is convex at the circumference, and the image-side surface S4 is concave at the circumference; the object-side surface S5 of the third lens element L3 is convex at the circumference, and the image-side surface S6 is convex at the circumference; the object-side surface S7 of the fourth lens element L4 is concave at the circumference, and the image-side surface S8 is convex at the circumference; the object-side surface S9 of the fifth lens element L5 is concave at the circumference, and the image-side surface S10 is concave at the circumference; the object-side surface S11 of the sixth lens element L6 is concave at the circumference, and the image-side surface S12 is convex at the circumference.
The stop STO is disposed on the object side S5 of the third lens L3.
In the second embodiment, the FOV of the optical imaging system is 118.27 °, the effective focal length f is 1.29mm, FOV/f is 91.68 °/mm, SD1/CT12 is 5.59, | DIS/FNO | 3.64%, CT45/ET5 is 0.08, SAG62/R61 is 0.42, | R41/ET4| 11.41, (CT1+ CT2)/SD1 is 0.44, (CT3+ CT4+ CT5)/BF is 2.13, TTL/(ImgH 2): 1.00.
The reference wavelength in the second embodiment is 587nm, and the optical imaging system 10 in the second embodiment satisfies the conditions of the following table.
TABLE 3
It should be noted that EFL is an effective focal length of the optical imaging system 10, FNO is an f-number of the optical imaging system 10, FOV is a field angle of the optical imaging system 10, and TTL is a distance from the object-side surface S1 of the first lens L1 to the imaging surface on the optical axis.
TABLE 4
Third embodiment
Referring to fig. 5 and 6, the optical imaging system 10 of the third embodiment includes, in order from an object side to an image side, a first lens element L1 with negative refractive power, a second lens element L2 with positive refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, and a sixth lens element L6 with positive refractive power.
The object-side surface S1 of the first lens element L1 is concave along the optical axis, and the image-side surface S2 is concave along the optical axis; the object-side surface S3 of the second lens element L2 is convex along the optical axis, and the image-side surface S4 is concave along the optical axis; the object-side surface S5 of the third lens element L3 is convex along the optical axis, and the image-side surface S6 is convex along the optical axis; the object-side surface S7 of the fourth lens element L4 is concave along the optical axis, and the image-side surface S8 is convex along the optical axis; the object-side surface S9 of the fifth lens element L5 is concave along the optical axis, the image-side surface S10 is concave along the optical axis, and both the object-side surface S9 and the image-side surface S10 are aspheric; the object-side surface S11 of the sixth lens element L6 is convex along the optical axis, the image-side surface S12 is concave along the optical axis, both the object-side surface S11 and the image-side surface S12 are aspheric, and at least one of the object-side surface S11 and the image-side surface S12 has at least one inflection point.
The object-side surface S1 of the first lens element L1 is convex at the circumference, and the image-side surface S2 is concave at the circumference; the object-side surface S3 of the second lens element L2 is convex at the circumference, and the image-side surface S4 is concave at the circumference; the object-side surface S5 of the third lens element L3 is concave at the circumference, and the image-side surface S6 is convex at the circumference; the object-side surface S7 of the fourth lens element L4 is convex at the circumference, and the image-side surface S8 is convex at the circumference; the object-side surface S9 of the fifth lens element L5 is concave at the circumference, and the image-side surface S10 is concave at the circumference; the object-side surface S11 of the sixth lens element L6 is concave at the circumference, and the image-side surface S12 is convex at the circumference.
The stop STO is disposed between the second lens L2 and the third lens L3.
In the third embodiment, the FOV of the optical imaging system is 126.2 °, the effective focal length f is 1.07mm, FOV/f is 117.94 °/mm, SD1/CT12 is 6.28, | DIS/FNO | 7.89%, CT45/ET5 is 0.05, SAG62/R61 is 0.30, | R41/ET4| 20.56, (CT1+ CT2)/SD1 is 0.39, (CT3+ CT4+ CT5)/BF is 2.16, TTL/(ImgH 2) ═ 0.97.
The reference wavelength in the third embodiment is 587nm, and the optical imaging system 10 in the third embodiment satisfies the conditions of the following table.
TABLE 5
It should be noted that EFL is an effective focal length of the optical imaging system 10, FNO is an f-number of the optical imaging system 10, FOV is a field angle of the optical imaging system 10, and TTL is a distance from the object-side surface S1 of the first lens L1 to the imaging surface on the optical axis.
Table 6
Fourth embodiment
Referring to fig. 7 and 8, the optical imaging system 10 of the fourth embodiment includes, in order from an object side to an image side, a first lens element L1 with negative refractive power, a second lens element L2 with positive refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with negative refractive power, a fifth lens element L5 with negative refractive power, and a sixth lens element L6 with positive refractive power.
The object-side surface S1 of the first lens element L1 is concave along the optical axis, and the image-side surface S2 is concave along the optical axis; the object-side surface S3 of the second lens element L2 is convex along the optical axis, and the image-side surface S4 is concave along the optical axis; the object-side surface S5 of the third lens element L3 is convex along the optical axis, and the image-side surface S6 is convex along the optical axis; the object-side surface S7 of the fourth lens element L4 is concave along the optical axis, and the image-side surface S8 is convex along the optical axis; the object-side surface S9 of the fifth lens element L5 is convex along the optical axis, the image-side surface S10 is concave along the optical axis, and both the object-side surface S9 and the image-side surface S10 are aspheric; the object-side surface S11 of the sixth lens element L6 is convex along the optical axis, the image-side surface S12 is concave along the optical axis, both the object-side surface S11 and the image-side surface S12 are aspheric, and at least one of the object-side surface S11 and the image-side surface S12 has at least one inflection point.
The object-side surface S1 of the first lens element L1 is convex at the circumference, and the image-side surface S2 is concave at the circumference; the object-side surface S3 of the second lens element L2 is convex at the circumference, and the image-side surface S4 is concave at the circumference; the object-side surface S5 of the third lens element L3 is convex at the circumference, and the image-side surface S6 is convex at the circumference; the object-side surface S7 of the fourth lens element L4 is concave at the circumference, and the image-side surface S8 is convex at the circumference; the object-side surface S9 of the fifth lens element L5 is concave at the circumference, and the image-side surface S10 is concave at the circumference; the object-side surface S11 of the sixth lens element L6 is concave at the circumference, and the image-side surface S12 is convex at the circumference.
The stop STO is disposed on the object side S5 of the third lens L3.
In the fourth embodiment, the FOV of the optical imaging system is 117.43 °, the effective focal length f is 1.2mm, FOV/f is 87.86 °/mm, SD1/CT12 is 8.19, | DIS/FNO | 7.05%, CT45/ET5 is 0.27, SAG62/R61 is 0.22, | R41/ET4| 33.92, (CT1+ CT2)/SD1 is 0.61, (CT3+ CT4+ CT5)/BF is 1.2, and TTL/(ImgH × 2) is 1.02.
The reference wavelength in the fourth embodiment is 587nm, and the optical imaging system 10 in the fourth embodiment satisfies the conditions of the following table.
TABLE 7
It should be noted that EFL is an effective focal length of the optical imaging system 10, FNO is an f-number of the optical imaging system 10, FOV is a field angle of the optical imaging system 10, and TTL is a distance from the object-side surface S1 of the first lens L1 to the imaging surface on the optical axis.
TABLE 8
Fifth embodiment
Referring to fig. 9 and 10, the optical imaging system 10 of the fifth embodiment includes, in order from an object side to an image side, a first lens element L1 with negative refractive power, a second lens element L2 with positive refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with negative refractive power, a fifth lens element L5 with negative refractive power, and a sixth lens element L6 with positive refractive power.
The object-side surface S1 of the first lens element L1 is concave along the optical axis, and the image-side surface S2 is concave along the optical axis; the object-side surface S3 of the second lens element L2 is convex along the optical axis, and the image-side surface S4 is concave along the optical axis; the object-side surface S5 of the third lens element L3 is convex along the optical axis, and the image-side surface S6 is convex along the optical axis; the object-side surface S7 of the fourth lens element L4 is concave along the optical axis, and the image-side surface S8 is convex along the optical axis; the object-side surface S9 of the fifth lens element L5 is convex along the optical axis, the image-side surface S10 is concave along the optical axis, and both the object-side surface S9 and the image-side surface S10 are aspheric; the object-side surface S11 of the sixth lens element L6 is convex along the optical axis, the image-side surface S12 is concave along the optical axis, both the object-side surface S11 and the image-side surface S12 are aspheric, and at least one of the object-side surface S11 and the image-side surface S12 has at least one inflection point.
The object-side surface S1 of the first lens element L1 is convex at the circumference, and the image-side surface S2 is concave at the circumference; the object-side surface S3 of the second lens element L2 is convex at the circumference, and the image-side surface S4 is concave at the circumference; the object-side surface S5 of the third lens element L3 is convex at the circumference, and the image-side surface S6 is convex at the circumference; the object-side surface S7 of the fourth lens element L4 is concave at the circumference, and the image-side surface S8 is convex at the circumference; the object-side surface S9 of the fifth lens element L5 is concave at the circumference, and the image-side surface S10 is concave at the circumference; the object-side surface S11 of the sixth lens element L6 is convex at the circumference, and the image-side surface S12 is convex at the circumference.
The stop STO is disposed on the object side S5 of the third lens L3.
In the fifth embodiment, the FOV of the optical imaging system is 130 °, the effective focal length f is 1.22mm, FOV/f is 106.56 °/mm, SD1/CT12 is 4.8, | DIS/FNO | 5.89%, CT45/ET5 is 0.26, SAG62/R61 is 0.32, | R41/ET4| 28.43, (CT1+ CT2)/SD1 is 0.44, (CT3+ CT4+ CT5)/BF is 1.82, and TTL/(ImgH |) 0.96.
The reference wavelength in the fifth embodiment is 587nm, and the optical imaging system 10 in the fifth embodiment satisfies the conditions of the following table.
TABLE 9
It should be noted that EFL is an effective focal length of the optical imaging system 10, FNO is an f-number of the optical imaging system 10, FOV is a field angle of the optical imaging system 10, and TTL is a distance from the object-side surface S1 of the first lens L1 to the imaging surface on the optical axis.
Sixth embodiment
Referring to fig. 11 and 12, the optical imaging system 10 of the sixth embodiment includes, in order from an object side to an image side, a first lens element L1 with negative refractive power, a second lens element L2 with positive refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, and a sixth lens element L6 with positive refractive power.
The object-side surface S1 of the first lens element L1 is concave along the optical axis, and the image-side surface S2 is concave along the optical axis; the object-side surface S3 of the second lens element L2 is convex along the optical axis, and the image-side surface S4 is concave along the optical axis; the object-side surface S5 of the third lens element L3 is convex along the optical axis, and the image-side surface S6 is convex along the optical axis; the object-side surface S7 of the fourth lens element L4 is concave along the optical axis, and the image-side surface S8 is convex along the optical axis; the object-side surface S9 of the fifth lens element L5 is concave along the optical axis, the image-side surface S10 is concave along the optical axis, and both the object-side surface S9 and the image-side surface S10 are aspheric; the object-side surface S11 of the sixth lens element L6 is concave along the optical axis, the image-side surface S12 is concave along the optical axis, both the object-side surface S11 and the image-side surface S12 are aspheric, and at least one of the object-side surface S11 and the image-side surface S12 has at least one inflection point.
The object-side surface S1 of the first lens element L1 is convex at the circumference, and the image-side surface S2 is concave at the circumference; the object-side surface S3 of the second lens element L2 is convex at the circumference, and the image-side surface S4 is concave at the circumference; the object-side surface S5 of the third lens element L3 is convex at the circumference, and the image-side surface S6 is convex at the circumference; the object-side surface S7 of the fourth lens element L4 is concave at the circumference, and the image-side surface S8 is convex at the circumference; the object-side surface S9 of the fifth lens element L5 is concave at the circumference, and the image-side surface S10 is concave at the circumference; the object-side surface S11 of the sixth lens element L6 is concave at the circumference, and the image-side surface S12 is convex at the circumference.
The stop STO is disposed between the second lens L2 and the third lens L3.
In the sixth embodiment, the FOV of the optical imaging system is 126.58 °, the effective focal length f is 1.05mm, FOV/f is 120.55 °/mm, SD1/CT12 is 5.18, | DIS/FNO | 2.12%, CT45/ET5 is 0.19, SAG62/R61 is 0.31, | R41/ET4| 13.74, (CT1+ CT2)/SD1 is 0.38, (CT3+ CT4+ CT5)/BF 2.33, TTL/(ImgH ═ 2) — 1.03.
The reference wavelength in the sixth embodiment is 587nm, and the optical imaging system 10 in the sixth embodiment satisfies the conditions of the following table.
TABLE 11
It should be noted that EFL is an effective focal length of the optical imaging system 10, FNO is an f-number of the optical imaging system 10, FOV is a field angle of the optical imaging system 10, and TTL is a distance from the object-side surface S1 of the first lens L1 to the imaging surface on the optical axis.
TABLE 12
Seventh embodiment
Referring to fig. 13 and 14, the optical imaging system 10 of the seventh embodiment includes, in order from an object side to an image side, a first lens element L1 with negative refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with negative refractive power, a fifth lens element L5 with negative refractive power, and a sixth lens element L6 with positive refractive power.
The object-side surface S1 of the first lens element L1 is concave along the optical axis, and the image-side surface S2 is concave along the optical axis; the object-side surface S3 of the second lens element L2 is convex along the optical axis, and the image-side surface S4 is concave along the optical axis; the object-side surface S5 of the third lens element L3 is convex along the optical axis, and the image-side surface S6 is convex along the optical axis; the object-side surface S7 of the fourth lens element L4 is concave along the optical axis, and the image-side surface S8 is convex along the optical axis; the object-side surface S9 of the fifth lens element L5 is convex along the optical axis, the image-side surface S10 is concave along the optical axis, and both the object-side surface S9 and the image-side surface S10 are aspheric; the object-side surface S11 of the sixth lens element L6 is convex along the optical axis, the image-side surface S12 is concave along the optical axis, both the object-side surface S11 and the image-side surface S12 are aspheric, and at least one of the object-side surface S11 and the image-side surface S12 has at least one inflection point.
The object-side surface S1 of the first lens element L1 is convex at the circumference, and the image-side surface S2 is concave at the circumference; the object-side surface S3 of the second lens element L2 is convex at the circumference, and the image-side surface S4 is concave at the circumference; the object-side surface S5 of the third lens element L3 is convex at the circumference, and the image-side surface S6 is convex at the circumference; the object-side surface S7 of the fourth lens element L4 is convex at the circumference, and the image-side surface S8 is convex at the circumference; the object-side surface S9 of the fifth lens element L5 is concave at the circumference, and the image-side surface S10 is concave at the circumference; the object-side surface S11 of the sixth lens element L6 is concave at the circumference, and the image-side surface S12 is convex at the circumference.
The stop STO is disposed between the second lens L2 and the third lens L3.
In the seventh embodiment, the field angle FOV of the optical imaging system is 134.4 °, the effective focal length f is 1.05mm, FOV/f is 128 °/mm, SD1/CT12 is 8.67, | DIS/FNO | 6.98%, CT45/ET5 is 0.20, SAG62/R61 is 0.46, | R41/ET4| 71.20, (CT1+ CT2)/SD1 is 0.40, (CT3+ CT4+ 5)/BF is 1.97, TTL/(ImgH 2) ═ 0.95.
The reference wavelength in the seventh embodiment is 587nm, and the optical imaging system 10 in the seventh embodiment satisfies the conditions of the following table.
Watch 13
It should be noted that EFL is the effective focal length of the optical imaging system 10, FNO is the f-number of the optical imaging system 10, FOV is the field angle of the optical imaging system 10, and TTL is the total length of the optical imaging system 10
TABLE 14
Referring to fig. 15, an image capturing module 100 according to an embodiment of the present invention includes an optical imaging system 10 and a photosensitive element 20, wherein the photosensitive element 20 is disposed on an image side of the optical imaging system 10.
Specifically, the photosensitive element 20 may be a Complementary Metal Oxide Semiconductor (CMOS) image sensor or a Charge-coupled device (CCD).
The utility model discloses get for instance module 100 can promote optical imaging system 10 to the catching ability of low frequency detail through the configuration of above-mentioned reasonable refractive power, effectively reduces marginal visual field distortion, promotes the f-number, has realized wide visual angle and higher imaging quality simultaneously to reduce optical imaging system 10's size, realized optical imaging system 10's miniaturization.
Referring to fig. 16, an electronic device 1000 according to an embodiment of the present invention includes a housing 200 and an image capturing module 100, wherein the image capturing module 100 is mounted on the housing 200.
The electronic device 1000 of the embodiment of the present invention includes but is not limited to an electronic device supporting imaging, such as a smart phone, a tablet computer, a notebook computer, an electronic book reader, a Portable Multimedia Player (PMP), a portable phone, a video phone, a digital still camera, a mobile medical device, and a wearable device.
The optical imaging system 10 in the electronic device 1000 of the above embodiment can improve the capturing capability of low-frequency details, effectively reduce the distortion of the marginal field of view, improve the f-number, and realize a wide viewing angle and high imaging quality through reasonable configuration of refractive power.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (13)
1. An optical imaging system, comprising, in order from an object side to an image side:
a first lens element with negative refractive power;
a second lens element with refractive power;
a third lens element with positive refractive power;
a fourth lens element with refractive power;
a fifth lens element with negative refractive power; and
a sixth lens element with positive refractive power;
the optical imaging system satisfies the following conditional expression:
87.0°/mm＜FOV/f≤128.0°/mm；
wherein FOV is the maximum field angle of the optical imaging system, and f is the effective focal length of the optical imaging system.
2. The optical imaging system of claim 1,
the object side surface of the first lens is a concave surface at the optical axis, and the image side surface of the first lens is a concave surface at the optical axis;
the object side surface of the second lens is a convex surface at the optical axis, and the image side surface of the second lens is a concave surface at the optical axis;
the object side surface of the third lens is a convex surface at the optical axis, and the image side surface of the third lens is a convex surface at the optical axis;
the object side surface of the fourth lens is a concave surface at the optical axis, and the image side surface of the fourth lens is a convex surface at the optical axis;
the object side surface of the fifth lens is a concave surface on the circumference, the image side surface of the fifth lens is a concave surface on the circumference, and both the object side surface and the image side surface are aspheric surfaces;
the object side surface of the sixth lens element is a convex surface at the optical axis, the image side surface of the sixth lens element is a concave surface at the optical axis, both the object side surface and the image side surface of the sixth lens element are aspheric, and at least one of the object side surface and the image side surface of the sixth lens element is provided with at least one inflection point.
3. The optical imaging system of claim 1, further comprising an optical stop disposed between the second lens and the third lens.
4. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:
4.5＜SD1/CT12＜16.5；
the SD1 is the vertical distance from the edge of the optically effective area of the object side surface of the first lens to the optical axis, and the CT12 is the distance between the image side surface of the first lens and the object side surface of the second lens on the optical axis.
5. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:
2.0％＜|DIS/FNO|＜8.0％；
wherein DIS is a maximum value of optical distortion of the optical imaging system, and FNO is an f-number of the optical imaging system.
6. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:
CT45/ET5＜0.30；
wherein CT45 is an axial distance between an image-side surface of the fourth lens element and an object-side surface of the fifth lens element, and ET5 is a thickness of an optically effective area edge of the fifth lens element.
7. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:
0.2＜SAG62/R61＜0.5；
wherein SAG62 is the maximum rise of the image-side surface of the sixth lens, and R61 is the radius of curvature of the object-side surface of the sixth lens at the optical axis.
8. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:
20.0＜|R41/ET4|＜71.5；
wherein R41 is a radius of curvature of an object-side surface of the fourth lens at an optical axis, and ET4 is a thickness of an optically effective area edge of the fourth lens.
9. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:
0.35＜(CT1+CT2)/SD1＜0.5；
wherein CT1 is a thickness of the first lens element along the optical axis, CT2 is a thickness of the second lens element along the optical axis, and SD1 is a perpendicular distance from an edge of the effective area of the object side of the first lens element to the optical axis.
10. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:
1.2≤(CT3+CT4+CT5)/BF＜2.4；
wherein CT3 is a thickness of the third lens element, CT4 is a thickness of the fourth lens element, CT5 is a thickness of the fifth lens element, and BF is a minimum distance between an image side surface of the sixth lens element and an image plane in a direction parallel to the optical axis.
11. The optical imaging system of claim 1, wherein the optical imaging system satisfies the following conditional expression:
0.85＜TTL/(ImgH*2)＜1.1
wherein, TTL is a distance on an optical axis from an object-side surface of the first lens element to an imaging surface, and ImgH is a half of a length of a diagonal line of an effective imaging area of the optical imaging system on the imaging surface.
12. An image capturing module comprises:
the optical imaging system of any one of claims 1 to 11; and
the photosensitive element is arranged on the image side of the optical imaging system.
13. An electronic device, comprising:
a housing; and
the image capture module of claim 12, mounted on the housing.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114967075A (en) * | 2022-08-01 | 2022-08-30 | 江西晶超光学有限公司 | Optical lens, camera module and electronic equipment |
| CN115524897A (en) * | 2022-03-08 | 2022-12-27 | 荣耀终端有限公司 | Camera lens, lens module and electronic equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115524897A (en) * | 2022-03-08 | 2022-12-27 | 荣耀终端有限公司 | Camera lens, lens module and electronic equipment |
| CN114967075A (en) * | 2022-08-01 | 2022-08-30 | 江西晶超光学有限公司 | Optical lens, camera module and electronic equipment |
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