CN112198627A - Optical system, lens module and electronic equipment - Google Patents
Optical system, lens module and electronic equipment Download PDFInfo
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- CN112198627A CN112198627A CN202011006211.8A CN202011006211A CN112198627A CN 112198627 A CN112198627 A CN 112198627A CN 202011006211 A CN202011006211 A CN 202011006211A CN 112198627 A CN112198627 A CN 112198627A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
An optical system, a lens module and an electronic device, the optical system comprises in order from an object side to an image side: the first lens element with negative refractive power has a planar object-side surface; the second lens element with negative refractive power has a concave object-side surface; a third lens element with positive refractive power having a convex object-side surface; a fourth lens element with positive refractive power having a concave object-side surface; the fifth lens element with positive refractive power has a convex object-side surface and a convex image-side surface; the sixth lens element with negative refractive power has a concave object-side surface and a concave image-side surface; the optical system satisfies the conditional expression: -51< f56/f < -10. Through the arrangement, the optical system can simultaneously meet the technical requirements of presentation of long-distance details and clear imaging in a large-angle range, and has a wide imaging view field range and a deep imaging depth range.
Description
Technical Field
The invention belongs to the field of optical imaging, and particularly relates to an optical system, a lens module and electronic equipment.
Background
With the development of the vehicle-mounted industry, the technical requirements of automobile driving auxiliary cameras such as forward-looking cameras, side-looking cameras, automatic cruising cameras, automobile data recorders and automobile backing images are higher and higher. The side-looking camera is a vehicle-mounted camera used for monitoring road conditions on the left side and the right side of the automobile and can be used as a camera system in an advanced driver assistance system to analyze video contents. With the side-looking camera, a driver can visually identify and monitor obstacles and pedestrians in blind areas on the left side and the right side of the automobile in the running process of the automobile. When a driver drives an automobile to turn and turn around through a special place (such as a crossroad, a roadblock, a parking lot and the like), the side-looking camera is opened at any time, the driving environment is judged, a correct instruction is given by a feedback automobile central system to avoid the occurrence of driving accidents, the side-looking camera can also realize the road condition monitoring function, and the basis is provided for the judgment of law enforcement personnel on various traffic accidents and vehicle violation.
However, the existing side-looking camera lens cannot simultaneously meet the requirements of presentation of long-distance details and clear imaging in a large angle range, and cannot accurately judge the long-distance shooting details in real time to give an early warning or avoid obstacles in the large angle range, so that the driving risk is caused.
Disclosure of Invention
The invention aims to provide an optical system, a lens module and electronic equipment, which can simultaneously meet the requirements of presentation of long-distance details and clear imaging in a large angle range.
In order to realize the purpose of the invention, the invention provides the following technical scheme:
in a first aspect, the present invention provides an optical system comprising, in order from an object side to an image side: the first lens element with negative refractive power has a planar object-side surface; the second lens element with negative refractive power has a concave object-side surface; a third lens element with positive refractive power having a convex object-side surface; the fourth lens element with positive refractive power has a concave object-side surface at an optical axis; the fifth lens element with positive refractive power has a convex object-side surface and a convex image-side surface; the sixth lens element with negative refractive power has a concave object-side surface and a concave image-side surface; the optical system satisfies the conditional expression: -51< f56/f < -10; wherein f56 is the combined effective focal length of the fifth lens and the sixth lens, and f is the effective focal length of the optical system. By reasonably configuring the surface shapes and the refractive powers of the first lens element to the sixth lens element, the optical system can simultaneously meet the technical requirements of presenting more distance details and clearly imaging in a wide angle range, and has a wider imaging visual field range and a deeper imaging depth range. Meanwhile, the value of f56/f is between-51 and-10, the fifth lens provides positive refractive power for the optical system, the sixth lens provides negative refractive power for the optical system, and a combined lens structure formed by gluing two lenses with positive and negative refractive powers is used for facilitating mutual correction of aberrations. It is understood that when f56/f is less than-51, the refractive power of the combined lens is too small, which is liable to generate larger edge aberration and chromatic aberration, and is not favorable for improving the resolution performance. When the value of f56/f is higher than-10, the effective focal length of the combined lens is too large, and the total refractive power of the fifth lens element and the sixth lens element is too strong, so that the lens assembly is prone to generating a relatively serious astigmatism, which is not favorable for improving the imaging quality.
In one embodiment, the image side surface of the first lens is concave; the image side surface of the second lens is a convex surface; the image side surface of the third lens is a convex surface; the image side surface of the fourth lens is a convex surface at the optical axis; the image side surface of the fifth lens is glued with the object side surface of the sixth lens. The surface types of the first lens to the fourth lens are further optimized, so that the imaging view range is widened and the imaging depth range is deepened; meanwhile, the fifth lens and the sixth lens are arranged to be glued to form a combined lens, so that the astigmatism generated by phase difference and corrected light rays after being refracted by the front lens can be eliminated.
In one embodiment, an object-side surface and/or an image-side surface of at least one of the first lens to the sixth lens is aspheric. The object side surface and/or the image side surface of at least one of the first lens, the second lens and the sixth lens are/is arranged to be aspheric, so that aberration of the optical system is favorably corrected, and imaging quality of the optical system is improved.
In one embodiment, the optical system satisfies the conditional expression: 1< CT1/CT2< 2; wherein CT1 is the thickness of the first lens element on the optical axis, and CT2 is the thickness of the second lens element on the optical axis. By meeting the requirement that the value of CT1/CT2 is between 1 and 2, the problem of poor lens production molding can be avoided, and the molding uniformity of the lens is increased; meanwhile, the distribution relation of the refractive power between the first lens and the second lens can be effectively adjusted, so that the wide-angle and miniaturization of the optical system can be realized, and the optical performance of the optical system can be improved. It is understood that when the value of CT1/CT2 is lower than 1 or higher than 2, the refractive power ratio distribution of the first lens element and the second lens element is not reasonable, which is not favorable for correcting the aberration of the optical system.
In one embodiment, the optical system satisfies the conditional expression: -8< f2/f < -6; wherein f2 is the effective focal length of the second lens. The second lens is set as the negative lens by meeting the condition that the value of f2/f is between-8 and-6, so that negative refractive power is provided for the optical system, the light beam width is favorably expanded, light rays which are absorbed after large-angle light rays are refracted by the first lens are expanded and fully transmitted to a high-pixel imaging surface after being filled in a pupil, a wider field range is obtained, and the characteristic of high pixel of the optical system is favorably embodied. It is understood that the value of f2/f is less than-8 or more than-6, which is not favorable for correcting the aberration of the optical system, thereby reducing the imaging quality.
In one embodiment, the optical system satisfies the conditional expression: 3< f3/CT3< 4; wherein f3 is the effective focal length of the third lens, and CT3 is the thickness of the third lens on the optical axis. By satisfying that the value of f3/CT3 is between 3 and 4, the relation between the central thickness of the third lens and the effective focal length of the optical system is reasonably matched, the tolerance sensitivity of the central thickness of the third lens can be reduced, the processing difficulty of the single lens is reduced, the assembly yield of the lens group is favorably improved, and the production cost is further reduced. It can be understood that when the value of f3/CT3 is higher than 4, the optical system is too sensitive to the central thickness of the third lens, and the processing of the single lens is difficult to meet the required tolerance requirement, so that the assembly yield of the lens group is reduced, and the production cost is high; if the value of f3/CT3 is less than 3, the central thickness of the third lens is too large on the premise of satisfying the optical performance, and if the third lens is a glass lens, the larger the central thickness of the third lens is, the larger the weight of the third lens is, which is not favorable for realizing the light weight and the miniaturization of the optical system.
In one embodiment, the optical system satisfies the conditional expression: -8< R4/CT4< -5; wherein R4 is a radius of curvature of an object-side surface of the fourth lens element at an optical axis, and CT4 is a thickness of the fourth lens element at the optical axis. By meeting the condition that the value of R4/CT4 is between-8 and-5, and the object side surface of the fourth lens is a concave surface, light can be further diffused, the surface shape is smooth, and the deviation of incident angles and emergent angles of light rays with different fields of view can be reduced, so that the sensitivity is reduced. Meanwhile, the fourth lens has proper thickness, so that the processing difficulty can be reduced, the sensitivity of thickness tolerance can be reduced, and the yield can be improved. It can be understood that when the value of R4/CT4 is higher than-5, the central thickness of the fourth lens is too large, and the weight of the fourth lens is larger, which is not favorable for realizing the characteristics of light weight and miniaturization of the optical system.
In one embodiment, the optical system satisfies the conditional expression: -25< f56/f < -10. By meeting the condition that the value of f56/f is between-25 and-10, the generation probability of aberration and astigmatism of the optical system can be better corrected, the improvement of imaging quality is facilitated, and the characteristic of high pixel of the optical system is facilitated to be embodied.
In one embodiment, the optical system satisfies the conditional expression: 4< TTL/f < 6; wherein, TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis. By meeting the TTL/f value between 4 and 6, the total optical length of the optical system is controlled while the field angle range of the optical system is met, and the miniaturization of the optical system is facilitated. When the value of TTL/f is higher than 6, the total length of the optical system is too long, which is not beneficial to miniaturization. When the value of TTL/f is less than 4, the optical system is too long in focal length, which is not favorable for satisfying the wide field angle range of the optical system, and sufficient object space information cannot be obtained.
In a second aspect, the present invention further provides a lens module, which includes a lens barrel, a photosensitive element and the optical system according to any one of the embodiments of the first aspect, wherein the first to sixth lenses of the optical system are mounted in the lens barrel, and the photosensitive element is disposed on an image side of the optical system. By adding the optical system provided by the invention into the lens module, the lens module can simultaneously realize the presentation of long-distance details and the clear imaging in a large-angle range, has a wide imaging view range and a deep imaging depth range, is favorable for accurately judging the details of long-distance shooting in real time to make early warning, and avoids obstacles in the large-angle range, thereby improving the driving safety.
In a third aspect, the present invention further provides an electronic device, where the electronic device includes a housing and the lens module of the second aspect, and the lens module is disposed in the housing. By adding the lens module provided by the invention into the electronic equipment, the electronic equipment has a wider imaging view range and a deeper imaging depth range, and is beneficial to accurately judging details shot at a longer distance in real time to give an early warning, avoid obstacles in a large angle range and improve the driving safety.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1a is a schematic structural diagram of an optical system of a first embodiment;
FIG. 1b is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the first embodiment;
FIG. 2a is a schematic structural diagram of an optical system of a second embodiment;
FIG. 2b is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the second embodiment;
FIG. 3a is a schematic structural diagram of an optical system of a third embodiment;
FIG. 3b is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the third embodiment;
FIG. 4a is a schematic structural diagram of an optical system of a fourth embodiment;
FIG. 4b is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the fourth embodiment;
FIG. 5a is a schematic structural diagram of an optical system of a fifth embodiment;
FIG. 5b is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the fifth embodiment;
FIG. 6a is a schematic structural diagram of an optical system of a sixth embodiment;
fig. 6b is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the sixth embodiment.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
The embodiment of the invention provides electronic equipment, which comprises a shell and a lens module provided by the embodiment of the invention, wherein the lens module is arranged in the shell. This electronic equipment can be for smart mobile phone, Personal Digital Assistant (PDA), panel computer, intelligent wrist-watch, unmanned aerial vehicle, electronic books read ware, vehicle event data recorder, wearable device and control security protection equipment etc.. Preferably to advanced driver assistance systems. By adding the lens module provided by the invention into the electronic equipment, the electronic equipment has a wider imaging view range and a deeper imaging depth range, and is beneficial to accurately judging the details of remote shooting in real time to give an early warning, avoid obstacles in a large angle range and improve the driving safety.
The embodiment of the invention also provides a lens module, which comprises a lens barrel, a photosensitive element and the optical system, wherein the first lens to the sixth lens of the optical system are arranged in the lens barrel, and the photosensitive element is arranged at the image side of the optical system and is used for converting the light rays of objects which pass through the first lens to the sixth lens and are incident on the photosensitive element into electric signals of images. The photosensitive element may be a Complementary Metal Oxide Semiconductor (CMOS) or a Charge-coupled Device (CCD). The lens module can be an independent lens of a digital camera, and also can be an imaging module integrated on electronic equipment such as a smart phone, preferably a side-looking camera and a front-looking camera in an advanced driver assistance system and a monitoring security device. By adding the optical system provided by the invention into the lens module, the lens module can simultaneously realize the presentation of long-distance details and the clear imaging in a large-angle range, has a wide imaging view range and a deep imaging depth range, is favorable for accurately judging the details of long-distance shooting in real time to make early warning, and avoids obstacles in the large-angle range, thereby improving the driving safety.
The present invention provides an optical system, which includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The concrete structure is as follows:
the first lens element with negative refractive power has a planar object-side surface;
the second lens element with negative refractive power has a concave object-side surface;
a third lens element with positive refractive power having a convex object-side surface;
the fourth lens element with positive refractive power has a concave object-side surface at an optical axis;
the fifth lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the sixth lens element with negative refractive power has a concave object-side surface and a concave image-side surface;
the optical system satisfies the conditional expression:
-51<f56/f<-10；
wherein f56 is the combined effective focal length of the fifth lens and the sixth lens, and f is the effective focal length of the optical system.
By reasonably configuring the surface shapes and the refractive powers of the first lens element to the sixth lens element, the optical system can simultaneously meet the technical requirements of presenting more distance details and clearly imaging in a wide angle range, and has a wider imaging visual field range and a deeper imaging depth range. Meanwhile, the value of f56/f is between-51 and-10, the fifth lens provides positive refractive power for the optical system, the sixth lens provides negative refractive power for the optical system, and a combined lens structure formed by gluing two lenses with positive and negative refractive powers is used for facilitating mutual correction of aberrations. It is understood that when f56/f is less than-51, the refractive power of the combined lens is too small, which is liable to generate larger edge aberration and chromatic aberration, and is not favorable for improving the resolution performance. When the value of f56/f is higher than-10, the effective focal length of the combined lens is too large, and the total refractive power of the fifth lens element and the sixth lens element is too strong, so that the lens assembly is prone to generating a relatively serious astigmatism, which is not favorable for improving the imaging quality. Specifically, f56/f can be-51, -45, -43, -36, -31, -22, -15, -10, etc.
In one embodiment, the image side surface of the first lens is concave;
the image side surface of the second lens is a convex surface;
the image side surface of the third lens is a convex surface;
the image side surface of the fourth lens is a convex surface at the optical axis;
the image side surface of the fifth lens is glued with the object side surface of the sixth lens.
The surface types of the first lens to the fourth lens are further optimized, so that the imaging view range is widened and the imaging depth range is deepened; meanwhile, the fifth lens and the sixth lens are arranged to be glued to form a combined lens, so that the astigmatism generated by phase difference and corrected light rays after being refracted by the front lens can be eliminated.
In one embodiment, an object-side surface and/or an image-side surface of at least one of the first lens to the sixth lens is aspheric. Specifically, the object-side surface and/or the image-side surface of the plurality of lenses may be aspheric, or the object-side surface and/or the image-side surface of one lens may be aspheric. Preferably, both the object-side surface and the image-side surface of the fourth lens are aspheric. The object side surface and/or the image side surface of at least one of the first lens, the second lens and the sixth lens are/is arranged to be aspheric, so that aberration of the optical system is favorably corrected, and imaging quality of the optical system is improved.
In one embodiment, the optical system satisfies the conditional expression: 1< CT1/CT2< 2; wherein CT1 is the thickness of the first lens element on the optical axis, and CT2 is the thickness of the second lens element on the optical axis. By meeting the requirement that the value of CT1/CT2 is between 1 and 2, the problem of poor lens production molding can be avoided, and the molding uniformity of the lens is increased; meanwhile, the distribution relation of the refractive powers between the first lens and the second lens can be effectively adjusted, so that the wide-angle and miniaturization of the optical system can be realized, and the optical performance of the optical system can be improved. It is understood that when the value of CT1/CT2 is lower than 1 or higher than 2, the refractive power ratio distribution of the first lens element and the second lens element is not reasonable, which is not favorable for correcting the aberration of the optical system. Specifically, CT1/CT2 can take the values of 1, 1.2, 1.35, 1.42, 1.68, 1.86, 2, and the like.
In one embodiment, the optical system satisfies the conditional expression: -8< f2/f < -6; wherein f2 is the effective focal length of the second lens. The second lens is set as the negative lens by meeting the condition that the value of f2/f is between-8 and-6, so that negative refractive power is provided for the optical system, the light beam width is favorably expanded, light rays which are absorbed after large-angle light rays are refracted by the first lens are expanded and fully transmitted to a high-pixel imaging surface after being filled in a pupil, a wider field range is obtained, and the characteristic of high pixel of the optical system is favorably embodied. It is understood that the value of f2/f is less than-8 or more than-6, which is not favorable for correcting the aberration of the optical system, thereby reducing the imaging quality. Specifically, f2/f can be-8, -7.8, -7.5, -7.1, -6.7, -6.2, -6, etc.
In one embodiment, the optical system satisfies the conditional expression: 3< f3/CT3< 4; wherein f3 is the effective focal length of the third lens, and CT3 is the thickness of the third lens on the optical axis. By satisfying that the value of f3/CT3 is between 3 and 4, the relation between the central thickness of the third lens and the effective focal length of the optical system is reasonably matched, the tolerance sensitivity of the central thickness of the third lens can be reduced, the processing difficulty of the single lens is reduced, the assembly yield of the lens group is favorably improved, and the production cost is further reduced. It can be understood that when the value of f3/CT3 is higher than 4, the optical system is too sensitive to the central thickness of the third lens, and the processing of the single lens is difficult to meet the required tolerance requirement, so that the assembly yield of the lens group is reduced, and the production cost is high; if the value of f3/CT3 is less than 3, the central thickness of the third lens is too large on the premise of satisfying the optical performance, and if the third lens is a glass lens, the larger the central thickness of the third lens is, the larger the weight of the third lens is, which is not favorable for realizing the light weight and the miniaturization of the optical system. Specifically, f3/CT3 can be 3, 3.1, 3.5, 3.6, 3.8, 4, and the like.
In one embodiment, the optical system satisfies the conditional expression: -8< R4/CT4< -5; wherein R4 is a radius of curvature of an object-side surface of the fourth lens element at an optical axis, and CT4 is a thickness of the fourth lens element at the optical axis. By meeting the condition that the value of R4/CT4 is between-8 and-5, and the object side surface of the fourth lens is a concave surface, light can be further diffused, the surface shape is smooth, and the deviation of incident angles and emergent angles of light rays with different fields of view can be reduced, so that the sensitivity is reduced. Meanwhile, the fourth lens has proper thickness, so that the processing difficulty can be reduced, the sensitivity of thickness tolerance can be reduced, and the yield can be improved. It can be understood that when the value of R4/CT4 is higher than-5, the central thickness of the fourth lens is too large, and the weight of the fourth lens is larger, which is not favorable for realizing the characteristics of light weight and miniaturization of the optical system. Specifically, the value of R4/CT4 can be-8, -7.6, -7, -6.5, -5.9, -5, etc.
In one embodiment, the optical system satisfies the conditional expression: -25< f56/f < -10. By meeting the condition that the value of f56/f is between-25 and-10, the generation probability of aberration and astigmatism of the optical system can be better corrected, the improvement of imaging quality is facilitated, and the characteristic of high pixel of the optical system is facilitated to be embodied. Specifically, f56/f can be-25, -21, -14, -12, -10, etc.
In one embodiment, the optical system satisfies the conditional expression: 4< TTL/f < 6; wherein, TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis. By meeting the TTL/f value between 4 and 6, the total optical length of the optical system is controlled while the field angle range of the optical system is met, and the miniaturization of the optical system is facilitated. When the value of TTL/f is higher than 6, the total length of the optical system is too long, which is not beneficial to miniaturization. When the value of TTL/f is less than 4, the optical system is too long in focal length, which is not favorable for satisfying the wide field angle range of the optical system, and sufficient object space information cannot be obtained. Specifically, the value of TTL/f can be 4, 4.3, 4.6, 5.1, 5.6, 6, and the like.
The optical system provided by the embodiment of the invention can be applied to advanced driver assistance systems, monitoring devices and the like, and particularly can be used for a side-looking camera lens for vehicle-mounted use. The optical system has better imaging quality, improves the production yield of the lens, not only increases the field angle range and widens the imaging field range while ensuring high pixels, but also improves the focal length of the system and deepens the imaging depth range. Therefore, the shooting picture in a large angle range can be captured while the remote detailed information is captured, and the driving environment of the left and right vehicle bodies is more clearly transmitted to the system to be identified or is clearly displayed on the display screen. The automobile safety monitoring system is convenient for a driver to make accurate judgment and avoid accidents, can provide a clear view for the driver in the aspect of driving record, and provides guarantee for the driver to drive safely. When the method is used for monitoring security, detail information can be clearly recorded, and the like, and corresponding technical support and application guarantee are provided in the aspect of practical application.
First embodiment
Referring to fig. 1a and fig. 1b, the optical system of the present embodiment, in order from an object side to an image side along an optical axis, includes:
the first lens element L1 with negative refractive power has a planar object-side surface S1 and a concave image-side surface S2;
the second lens element L2 with negative refractive power has a concave object-side surface S3 and a convex image-side surface S4;
the third lens element L3 with positive refractive power having a convex object-side surface S5 and a convex image-side surface S6;
the fourth lens element L4 with positive refractive power having a concave object-side surface S7 and a convex image-side surface S8;
the fifth lens element L5 with positive refractive power has a convex object-side surface S9 and a convex image-side surface S10.
The sixth lens element L6 with negative refractive power has a concave object-side surface S10 and a concave image-side surface S11.
The first lens element L1 to the sixth lens element L6 are made of glass. Since the image-side surface of the fifth lens L5 and the object-side surface of the sixth lens L6 are cemented, the surface S10 is the image-side surface of the fifth lens L5 and the object-side surface of the sixth lens L6.
Further, the optical system includes a diaphragm ST0, an infrared filter IR, a cover glass L7, and an imaging surface IMG. A stop ST0 is disposed between the image side surface S6 of the third lens L3 and the object side surface S7 of the fourth lens L4, and controls the amount of light entering. In other embodiments, the stop ST0 can also be disposed on the object-side surface and the image-side surface of any one of the lenses. The infrared filter IR is disposed on the image side of the sixth lens L6, and includes an object side surface S12 and an image side surface S13, and is configured to filter infrared light, so that the light incident on the imaging surface IMG is visible light with a wavelength of 380nm to 780 nm. The material of the infrared filter IR is glass, and a film can be coated on the glass. The protective glass L7 is disposed between the image side surface S13 and the image plane IMG of the infrared filter IR, and includes an object side surface S14 and an image side surface S15, and the protective glass L7 can be used for protecting the image plane IMG. The imaging plane IMG is an effective pixel area of the photosensitive element.
Table 1a shows a table of characteristics of the optical system of the present embodiment in which data is obtained using light having a wavelength of 587.5618nm, and the units of the Y radius, thickness, and focal length are all millimeters (mm).
TABLE 1a
Wherein f is the effective focal length of the optical system, FNO is the f-number of the optical system, and FOV is the maximum field angle of the optical system in the diagonal direction.
In the present embodiment, the object-side surface S7 and the image-side surface S8 of the fourth lens L4 are both aspheric surfaces, and the surface type x of the aspheric lens can be defined by, but is not limited to, the following aspheric surface formula:
wherein x is the maximum rise of the distance from the vertex of the aspheric surface when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 1/R (i.e., paraxial curvature c is the inverse of radius R of Y in table 1a above); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface.
Table 1b shows the high-order term coefficients a4, a6, A8, a10, a12, a14, a16, a18, and a20 that can be used for each aspherical mirror surface in the first embodiment.
TABLE 1b
| Number of noodles | S7 | S8 |
| K | -4.500E+00 | -4.179E-01 |
| A4 | -5.431E-03 | 6.386E-04 |
| A6 | -4.057E-04 | -1.510E-04 |
| A8 | 6.209E-05 | 4.261E-05 |
| A10 | -1.960E-05 | -8.197E-06 |
| A12 | 0.000E+00 | 5.919E-07 |
| A14 | 0.000E+00 | 0.000E+00 |
| A16 | 0.000E+00 | 0.000E+00 |
| A18 | 0.000E+00 | 0.000E+00 |
| A20 | 0.000E+00 | 0.000E+00 |
Fig. 1b shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the first embodiment. The reference wavelength of the light rays of the astigmatism curve and the distortion curve is 587.5618nm, wherein the longitudinal spherical aberration curve represents the deviation of the convergent focus of the light rays with different wavelengths after passing through each lens of the optical system; the astigmatism curves are meridional image surface curvature and sagittal image surface curvature; the distortion curve represents the distortion magnitude values corresponding to different angles of view. As can be seen from fig. 1b, the optical system according to the first embodiment can achieve good imaging quality.
Second embodiment
Referring to fig. 2a and fig. 2b, the optical system of the present embodiment, in order from an object side to an image side along an optical axis direction, includes:
the first lens element L1 with negative refractive power has a planar object-side surface S1 and a concave image-side surface S2;
the second lens element L2 with negative refractive power has a concave object-side surface S3 and a convex image-side surface S4;
the third lens element L3 with positive refractive power having a convex object-side surface S5 and a convex image-side surface S6;
the fourth lens element L4 with positive refractive power having a concave object-side surface S7 and a convex image-side surface S8;
the fifth lens element L5 with positive refractive power has a convex object-side surface S9 and a convex image-side surface S10.
The sixth lens element L6 with negative refractive power has a concave object-side surface S10 and a concave image-side surface S11.
Table 2a shows a table of characteristics of the optical system of the present embodiment in which data is obtained using light having a wavelength of 587.5618nm, and the units of the Y radius, thickness, and focal length are all millimeters (mm).
TABLE 2a
Wherein f is the effective focal length of the optical system, FNO is the f-number of the optical system, and FOV is the maximum field angle of the optical system in the diagonal direction.
Table 2b gives the coefficients of high order terms that can be used for each aspherical mirror in the second embodiment, wherein each aspherical mirror type can be defined by the formula given in the first embodiment.
TABLE 2b
| Number of noodles | S7 | S8 |
| K | -2.216E+01 | -4.109E-01 |
| A4 | -5.361E-03 | 6.685E-04 |
| A6 | -3.269E-04 | -1.578E-04 |
| A8 | 3.613E-05 | 4.788E-05 |
| A10 | -1.447E-05 | -9.366E-06 |
| A12 | 0.000E+00 | 7.028E-07 |
| A14 | 0.000E+00 | 0.000E+00 |
| A16 | 0.000E+00 | 0.000E+00 |
| A18 | 0.000E+00 | 0.000E+00 |
| A20 | 0.000E+00 | 0.000E+00 |
Fig. 2b shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the second embodiment. The reference wavelength of the light of the astigmatism curve and the distortion curve is 587.5618 nm. As can be seen from fig. 2b, the optical system according to the second embodiment can achieve good imaging quality.
Third embodiment
Referring to fig. 3a and 3b, the optical system of the present embodiment, in order from an object side to an image side along an optical axis direction, includes:
the first lens element L1 with negative refractive power has a planar object-side surface S1 and a concave image-side surface S2;
the second lens element L2 with negative refractive power has a concave object-side surface S3 and a convex image-side surface S4;
the third lens element L3 with positive refractive power having a convex object-side surface S5 and a convex image-side surface S6;
the fourth lens element L4 with positive refractive power having a concave object-side surface S7 and a convex image-side surface S8;
the fifth lens element L5 with positive refractive power has a convex object-side surface S9 and a convex image-side surface S10.
The sixth lens element L6 with negative refractive power has a concave object-side surface S10 and a concave image-side surface S11.
Table 3a shows a table of characteristics of the optical system of the present embodiment in which data is obtained using light having a wavelength of 587.5618nm, and the units of the Y radius, thickness, and focal length are all millimeters (mm).
TABLE 3a
Wherein f is the effective focal length of the optical system, FNO is the f-number of the optical system, and FOV is the maximum field angle of the optical system in the diagonal direction.
Table 3b gives the coefficients of high-order terms that can be used for each aspherical mirror surface in the third embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.
TABLE 3b
| Number of noodles | S7 | S8 |
| K | -2.579E+01 | -4.163E-01 |
| A4 | -5.552E-03 | 5.503E-04 |
| A6 | -1.604E-04 | -5.246E-05 |
| A8 | -5.079E-05 | 3.040E-06 |
| A10 | 0.000E+00 | -1.106E-06 |
| A12 | 0.000E+00 | 1.328E-07 |
| A14 | 0.000E+00 | 0.000E+00 |
| A16 | 0.000E+00 | 0.000E+00 |
| A18 | 0.000E+00 | 0.000E+00 |
| A20 | 0.000E+00 | 0.000E+00 |
Fig. 3b shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the third embodiment. The reference wavelength of the light of the astigmatism curve and the distortion curve is 587.5618 nm. As can be seen from fig. 3b, the optical system according to the third embodiment can achieve good imaging quality.
Fourth embodiment
Referring to fig. 4a and 4b, the optical system of the present embodiment, in order from an object side to an image side along an optical axis direction, includes:
the first lens element L1 with negative refractive power has a planar object-side surface S1 and a concave image-side surface S2;
the second lens element L2 with negative refractive power has a concave object-side surface S3 and a convex image-side surface S4;
the third lens element L3 with positive refractive power having a convex object-side surface S5 and a convex image-side surface S6;
the fourth lens element L4 with positive refractive power having a concave object-side surface S7 and a convex image-side surface S8;
the fifth lens element L5 with positive refractive power has a convex object-side surface S9 and a convex image-side surface S10.
The sixth lens element L6 with negative refractive power has a concave object-side surface S10 and a concave image-side surface S11.
Table 4a shows a table of characteristics of the optical system of the present embodiment in which data is obtained using light having a wavelength of 587.5618nm, and the units of the Y radius, thickness, and focal length are all millimeters (mm).
TABLE 4a
Wherein f is the effective focal length of the optical system, FNO is the f-number of the optical system, and FOV is the maximum field angle of the optical system in the diagonal direction.
Table 4b gives the coefficients of high-order terms that can be used for each aspherical mirror surface in the fourth embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.
TABLE 4b
| Number of noodles | S7 | S8 |
| K | -9.898E+01 | -5.032E-01 |
| A4 | -7.352E-03 | 1.874E-04 |
| A6 | 2.367E-05 | -8.339E-05 |
| A8 | -6.364E-05 | 6.671E-06 |
| A10 | 0.000E+00 | -8.642E-07 |
| A12 | 0.000E+00 | 6.846E-08 |
| A14 | 0.000E+00 | 0.000E+00 |
| A16 | 0.000E+00 | 0.000E+00 |
| A18 | 0.000E+00 | 0.000E+00 |
| A20 | 0.000E+00 | 0.000E+00 |
Fig. 4b shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the fourth embodiment. The reference wavelength of the light of the astigmatism curve and the distortion curve is 587.5618 nm. As can be seen from fig. 4b, the optical system according to the fourth embodiment can achieve good imaging quality.
Fifth embodiment
Referring to fig. 5a and 5b, the optical system of the present embodiment, in order from an object side to an image side along an optical axis direction, includes:
the first lens element L1 with negative refractive power has a planar object-side surface S1 and a concave image-side surface S2;
the second lens element L2 with negative refractive power has a concave object-side surface S3 and a convex image-side surface S4;
the third lens element L3 with positive refractive power having a convex object-side surface S5 and a convex image-side surface S6;
the fourth lens element L4 with positive refractive power having a concave object-side surface S7 and a convex image-side surface S8;
the fifth lens element L5 with positive refractive power has a convex object-side surface S9 and a convex image-side surface S10.
The sixth lens element L6 with negative refractive power has a concave object-side surface S10 and a concave image-side surface S11.
Table 5a shows a table of characteristics of the optical system of the present embodiment in which data is obtained using light having a wavelength of 587.5618nm, and the units of the Y radius, thickness, and focal length are all millimeters (mm).
TABLE 5a
Wherein f is the effective focal length of the optical system, FNO is the f-number of the optical system, and FOV is the maximum field angle of the optical system in the diagonal direction.
Table 5b shows the high-order term coefficients that can be used for each aspherical mirror surface in the fifth embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.
TABLE 5b
| Number of noodles | S7 | S8 |
| K | -9.808E+00 | -3.889E-01 |
| A4 | -5.345E-03 | 4.428E-04 |
| A6 | -3.823E-04 | -1.259E-04 |
| A8 | 3.039E-05 | 3.393E-05 |
| A10 | -9.556E-06 | -6.865E-06 |
| A12 | 0.000E+00 | 4.898E-07 |
| A14 | 0.000E+00 | 0.000E+00 |
| A16 | 0.000E+00 | 0.000E+00 |
| A18 | 0.000E+00 | 0.000E+00 |
| A20 | 0.000E+00 | 0.000E+00 |
Fig. 5b shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the fifth embodiment. The reference wavelength of the light of the astigmatism curve and the distortion curve is 587.5618 nm. As can be seen from fig. 5b, the optical system according to the fifth embodiment can achieve good image quality.
Sixth embodiment
Referring to fig. 6a and 6b, the optical system of the present embodiment, in order from an object side to an image side along an optical axis direction, includes:
the first lens element L1 with negative refractive power has a planar object-side surface S1 and a concave image-side surface S2;
the second lens element L2 with negative refractive power has a concave object-side surface S3 and a convex image-side surface S4;
the third lens element L3 with positive refractive power having a convex object-side surface S5 and a convex image-side surface S6;
the fourth lens element L4 with positive refractive power having a concave object-side surface S7 and a convex image-side surface S8;
the fifth lens element L5 with positive refractive power has a convex object-side surface S9 and a convex image-side surface S10.
The sixth lens element L6 with negative refractive power has a concave object-side surface S10 and a concave image-side surface S11.
Table 6a shows a table of characteristics of the optical system of the present embodiment in which data is obtained using light having a wavelength of 587.5618nm, and the units of the Y radius, thickness, and focal length are all millimeters (mm).
TABLE 6a
Wherein f is the effective focal length of the optical system, FNO is the f-number of the optical system, and FOV is the maximum field angle of the optical system in the diagonal direction.
Table 6b shows the high-order term coefficients that can be used for each aspherical mirror surface in the sixth embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.
TABLE 6b
| Number of noodles | S7 | S8 |
| K | -3.279E+01 | -3.679E-01 |
| A4 | -5.005E-03 | 4.222E-04 |
| A6 | -3.364E-04 | -1.585E-04 |
| A8 | 1.889E-05 | 4.124E-05 |
| A10 | -8.386E-06 | -7.507E-06 |
| A12 | 0.000E+00 | 4.856E-07 |
| A14 | 0.000E+00 | 0.000E+00 |
| A16 | 0.000E+00 | 0.000E+00 |
| A18 | 0.000E+00 | 0.000E+00 |
| A20 | 0.000E+00 | 0.000E+00 |
Fig. 6b shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system of the sixth embodiment. The reference wavelength of the light of the astigmatism curve and the distortion curve is 587.5618 nm. As can be seen from fig. 6b, the optical system according to the sixth embodiment can achieve good image quality.
Table 7 shows values of CT1/CT2, f2/f, f3/CT3, R4/CT4, f56/f, TTL/f of the optical systems in the first to sixth embodiments.
TABLE 7
As can be seen from table 7, the optical systems of the first to sixth embodiments of the present invention each satisfy the following conditional expressions: 1< CT1/CT2<2, -8< f2/f < -6, 3< f3/CT3<4, -8< R4/CT4< -5, -51< f56/f < -10, -25< f56/f < -10, 4< TTL/f < 6.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An optical system comprising, in order from an object side to an image side:
the first lens element with negative refractive power has a planar object-side surface;
the second lens element with negative refractive power has a concave object-side surface;
a third lens element with positive refractive power having a convex object-side surface;
the fourth lens element with positive refractive power has a concave object-side surface at an optical axis;
the fifth lens element with positive refractive power has a convex object-side surface and a convex image-side surface;
the sixth lens element with negative refractive power has a concave object-side surface and a concave image-side surface;
the optical system satisfies the conditional expression:
-51<f56/f<-10；
wherein f56 is the combined effective focal length of the fifth lens and the sixth lens, and f is the effective focal length of the optical system.
2. The optical system of claim 1,
the image side surface of the first lens is a concave surface;
the image side surface of the second lens is a convex surface;
the image side surface of the third lens is a convex surface;
the image side surface of the fourth lens is a convex surface at the optical axis;
the image side surface of the fifth lens is glued with the object side surface of the sixth lens.
3. The optical system according to claim 1, wherein an object-side surface and/or an image-side surface of at least one of the first lens to the sixth lens is an aspherical surface.
4. The optical system according to claim 1, wherein the optical system satisfies a conditional expression:
1<CT1/CT2<2；
wherein CT1 is the thickness of the first lens element on the optical axis, and CT2 is the thickness of the second lens element on the optical axis.
5. The optical system according to claim 1, wherein the optical system satisfies a conditional expression:
-8<f2/f<-6；
wherein f2 is the effective focal length of the second lens.
6. The optical system according to claim 1, wherein the optical system satisfies a conditional expression:
3<f3/CT3<4；
wherein f3 is the effective focal length of the third lens, and CT3 is the thickness of the third lens on the optical axis.
7. The optical system according to claim 1, wherein the optical system satisfies a conditional expression:
-8<R4/CT4<-5；
wherein R4 is a radius of curvature of an object-side surface of the fourth lens element at an optical axis, and CT4 is a thickness of the fourth lens element at the optical axis.
8. The optical system according to claim 1, wherein the optical system satisfies a conditional expression:
4<TTL/f<6；
wherein, TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis.
9. A lens module comprising a lens barrel, a photosensitive element, and the optical system according to any one of claims 1 to 8, wherein the first to sixth lenses of the optical system are mounted in the lens barrel, and the photosensitive element is disposed on the image side of the optical system.
10. An electronic device comprising a housing and the lens module as claimed in claim 9, wherein the lens module is disposed in the housing.
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| JP2011145315A (en) * | 2010-01-12 | 2011-07-28 | Fujifilm Corp | Imaging lens, imaging optical system and imaging apparatus |
| CN108196355A (en) * | 2018-03-05 | 2018-06-22 | 嘉兴中润光学科技有限公司 | Optics tight shot |
| CN109425970A (en) * | 2017-09-01 | 2019-03-05 | 康达智株式会社 | Pick-up lens |
| CN208689250U (en) * | 2018-08-22 | 2019-04-02 | 福建海图智能科技有限公司 | A kind of Underwater Imaging camera lens |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011145315A (en) * | 2010-01-12 | 2011-07-28 | Fujifilm Corp | Imaging lens, imaging optical system and imaging apparatus |
| CN109425970A (en) * | 2017-09-01 | 2019-03-05 | 康达智株式会社 | Pick-up lens |
| CN108196355A (en) * | 2018-03-05 | 2018-06-22 | 嘉兴中润光学科技有限公司 | Optics tight shot |
| CN208689250U (en) * | 2018-08-22 | 2019-04-02 | 福建海图智能科技有限公司 | A kind of Underwater Imaging camera lens |
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Effective date of registration: 20230615 Address after: 330096 No.699 Tianxiang North Avenue, Nanchang hi tech Industrial Development Zone, Nanchang City, Jiangxi Province Patentee after: Jiangxi Oufei Optics Co.,Ltd. Address before: 300385 No.2, Hongyuan Road, Xiqing District, Tianjin Patentee before: Tianjin Oufei photoelectric Co.,Ltd. |