CN114002814A - Optical lens, camera module and electronic equipment - Google Patents
Optical lens, camera module and electronic equipment Download PDFInfo
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- CN114002814A CN114002814A CN202111319701.8A CN202111319701A CN114002814A CN 114002814 A CN114002814 A CN 114002814A CN 202111319701 A CN202111319701 A CN 202111319701A CN 114002814 A CN114002814 A CN 114002814A
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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
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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
- G02B13/0035—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 three 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
- G02B13/0065—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having a beam-folding prism or mirror
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
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- Optics & Photonics (AREA)
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Abstract
The invention discloses an optical lens, a camera module and electronic equipment, wherein the optical lens comprises a first lens, a second lens and a third lens which are sequentially arranged from an object side to an image side along an optical axis; the first lens element with positive refractive power has an object-side surface including an incident area far away from an optical axis and a second reflective area located at a paraxial axis, the image-side surface of the first lens element includes a first reflective area far away from the optical axis and an emergent area located at the paraxial axis, the second lens element with negative refractive power has a concave object-side surface and a concave image-side surface both at the paraxial axis, the third lens element with negative refractive power has a concave object-side surface and a convex image-side surface both at the paraxial axis, and the optical lens element satisfies the following relationships: 0.7< EFL/TTLc <1.2, EFL is the effective focal length of the optical lens, and TTLc is the total optical path length of the optical lens. By adopting the technical scheme of the invention, the miniaturization design of the optical lens can be realized, the resolution and the imaging definition of the optical lens are improved, the shooting quality of the optical lens is improved, and clear imaging is realized.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to an optical lens, a camera module and electronic equipment.
Background
At present, with the wide application of electronic devices such as mobile phones, tablet computers, unmanned aerial vehicles and computers in life, the requirements of people on the imaging quality of an optical lens are higher and higher, and the optical lens is required to be lighter, thinner and more miniaturized, and simultaneously, higher imaging quality is also achieved. In order to achieve sharp imaging and achieve higher imaging quality, the number of lenses of the optical lens is increasing, wherein the number of lenses required by the telephoto optical lens is more, which results in the zoom optical lens having a larger volume, and is not favorable for the development trend of miniaturization, lightness and thinness of the zoom optical lens. That is, under the design trend of light, thin and small-sized optical lens, the optical lens is difficult to clearly image, the image quality sense is poor, the resolution ratio is low, and the requirement of people on high-definition imaging of the optical lens is difficult to meet.
Disclosure of Invention
The embodiment of the invention discloses an optical lens, a camera module and electronic equipment, which can improve the resolution and imaging definition of the optical lens, improve the shooting quality of the optical lens and realize clear imaging while realizing the light, thin and miniaturized design of the optical lens.
In order to achieve the above object, in a first aspect, the present invention discloses an optical lens including a first lens, a second lens, and a third lens arranged in order from an object side to an image side along an optical axis;
the first lens element with positive refractive power has an object-side surface including an incident region far from an optical axis and a second reflecting region located at a paraxial axis, and an image-side surface including a first reflecting region far from the optical axis and an exit region located at the paraxial axis, wherein incident light enters the first lens element through the incident region, is reflected by the first reflecting region and the second reflecting region in sequence, and exits the first lens element through the exit region;
the second lens element with negative refractive power has a concave object-side surface at a paraxial region thereof and a concave image-side surface at a paraxial region thereof;
the third lens element with negative refractive power has a concave object-side surface at a paraxial region thereof and a convex image-side surface at a paraxial region thereof;
the optical lens satisfies the following relation: 0.7< EFL/TTLc < 1.2; the EFL is an effective focal length of the optical lens, and the TTLc is a total optical path length of the optical lens in a direction parallel to an optical axis, where the total optical path length is a sum of an optical path of an incident light entering the first reflection area through the incident area in a direction parallel to the optical axis, an optical path of an incident light reflecting the incident light to the second reflection area through the first reflection area in a direction parallel to the optical axis, an optical path of an incident light reflecting the incident light to the exit area through the second reflection area in a direction parallel to the optical axis, and an optical path of an incident light entering the imaging surface of the optical lens through the exit area in a direction parallel to the optical axis.
In the optical lens provided by the application, the first lens is provided with the incident area, the first reflection area, the second reflection area and the emergent area, so that the total length of the structure of the optical lens is favorably compressed while the total optical path length of the optical lens is increased, a reflection element does not need to be additionally erected to provide a miniaturized configuration, the number of elements is reduced, the cost is reduced, and the assembly error is reduced. The positive refractive power provided by the first lens, the first reflection area and the second reflection area can be arranged towards the object side of the optical lens, and the second reflection area can be arranged towards the image side of the optical lens, so that the configuration of long focal length and small field angle can be achieved on the premise of not increasing the thickness of the optical lens, the object details are clearer, and the recognition effect is better; the negative refractive power provided by the second lens element and the concave surface design of the object-side surface and the image-side surface at the paraxial region can ensure the incident angle of light and avoid excessive aberration; meanwhile, the negative refractive power provided by the third lens is matched, so that the edge aberration is favorably corrected, the imaging resolving power is improved, meanwhile, the concave surface type design of the object side surface of the third lens at the position of a lower beam axis is favorable for converging peripheral light rays, the phenomenon that stray light is caused due to overlarge incident angle is avoided, and the convex surface type design of the image side surface of the third lens at the position of the lower beam axis is favorable for balancing the aberration and is favorable for compressing the total length of the structure of the optical lens.
That is, by selecting a proper number of lenses and reasonably configuring the refractive power and the surface type of each lens, and the first lens having an incident area, a first reflection area, a second reflection area and an exit area, the total length of the structure of the optical lens can be compressed on the premise of not changing the total optical path length of the optical lens, so as to realize the light, thin and small design of the optical lens, and simultaneously meet the requirements of a telephoto lens, improve the optical performance, and improve the resolution and imaging definition of the optical lens, so that the optical lens has a better imaging effect, and meets the high-definition imaging requirements of people on the optical lens; and further causing the optical lens to satisfy the following relational expression: 0.7< EFL/TTLc <1.2, when the limitation of the relational expression is met, the total length of the structure of the optical lens can be shortened, and meanwhile, the optical lens has longer total optical path length so as to meet the requirement of a telephoto lens, improve the optical performance and the resolving power of the optical lens, improve the shooting quality of the optical lens and realize clear imaging. When the lower limit of the relation is lower, the total length of the optical lens structure is lengthened, which is not favorable for the miniaturization design of the optical lens; when the upper limit of the above relation is exceeded, the total structural length of the optical lens becomes short, and it is difficult to satisfy the focal length design requirement of the telephoto lens.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: TTL/EFL < 0.6; wherein, TTL is a distance on an optical axis from the incident area to an imaging surface of the optical lens (i.e. a total structural length of the optical lens), and EFL is an effective focal length of the optical lens.
By reasonably controlling the ratio of the total structural length of the optical lens to the effective focal length of the optical lens, the miniaturization design requirement of the optical lens can be met, the telephoto shooting function and the high-definition image shooting function of the optical lens can be realized, and meanwhile, the light can be better converged on the imaging surface of the optical lens. Particularly, the first lens with two reflecting surfaces can effectively shorten the total structural length of the optical lens while enabling the optical lens to have a long focal length, and can introduce spherical aberration to the minimum extent and improve the optical performance of the optical lens. When the total length of the optical lens exceeds the upper limit of the above relation, the total length of the optical lens is too short relative to the effective focal length of the optical lens, which results in the increase of the sensitivity of the optical lens and is also not beneficial to the convergence of light rays on the image plane.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.2< YI/EPD < 0.5; wherein YI is half of the image height corresponding to the maximum field angle of the optical lens, and EPD is the entrance pupil diameter of the optical lens.
The size of the diameter of the entrance pupil of the optical lens is related to the f-number of the optical lens, which determines the brightness of the shot picture of the optical lens. Therefore, when the limitation of the above relation is satisfied, a large light flux amount of the optical lens can be realized on the premise of maintaining the telephoto performance of the optical lens, that is, the optical lens has a better telephoto performance when being in the telephoto, and simultaneously has a larger light flux amount, which is not only beneficial to making the shot image of the optical lens clearer and achieving a better imaging effect; the optical lens can acquire more scene contents, and imaging information of the optical lens is enriched. Moreover, when the optical lens has a large luminous flux per unit time, a clear imaging effect can be achieved even when photographing is performed in a dark environment. When the image height of the optical lens is lower than the lower limit of the relational expression, the image height of the optical lens is too small to be matched with a photosensitive chip with high pixels, so that high-pixel imaging is difficult to realize; when the ratio exceeds the upper limit of the above relational expression, the diameter of the entrance pupil of the optical lens is too small, which causes insufficient light flux and insufficient relative brightness of light, thereby causing reduction of picture sensitivity, darkening of images shot by the optical lens, and affecting the shooting quality.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 30< | L1R1|/| L1R2| < 1000; wherein L1R1 is the radius of curvature of the incident region at the optical axis, and L1R2 is the radius of curvature of the first reflective region at the optical axis.
Because the shape of the first lens influences the length of the total structure length of the optical lens, when the limitation of the relational expression is met, the total structure length of the optical lens can be prevented from being too long, and the optical lens is favorable for conforming to the miniaturization design. When the ratio of the radius of curvature of the incident area at the optical axis to the radius of curvature of the first reflective area at the optical axis is smaller than the lower limit of the above relation, this means that the absolute value of the radius of curvature of the incident area at the optical axis becomes smaller or the absolute value of the radius of curvature of the first reflective area at the optical axis becomes larger, and the angle of the incident area becomes too large, which makes the first lens difficult to manufacture; when the ratio of the radius of curvature of the incident area at the optical axis to the radius of curvature of the first reflective area at the optical axis is larger than the upper limit of the above relation, this means that the absolute value of the radius of curvature of the incident area at the optical axis becomes larger or the absolute value of the radius of curvature of the first reflective area at the optical axis becomes smaller, and the angle of the incident area becomes too small to meet the design requirement of the field angle of the telephoto lens.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 40.0< RI/YI < 52.0; wherein RI is a relative illuminance corresponding to a maximum field angle of the optical lens, and the relative illuminance refers to: and the ratio of the central illumination to the peripheral illumination of the optical lens, wherein YI is half of the height of the image corresponding to the maximum field angle of the optical lens.
When the limitation of the relational expression is met, the requirement of the optical lens on relative illumination is favorably met, the illumination of the edge field is favorably improved, the brightness of the optical lens is higher, the shooting effect of the optical lens in a dark light environment is enhanced, and the depth recognition precision of the optical lens is improved. When the brightness of the whole shooting picture of the optical lens is lower than the lower limit of the relational expression, the relative illumination corresponding to the maximum field angle of the optical lens is reduced, so that the peripheral light quantity received by the photosensitive chip is little, the brightness of the whole shooting picture of the optical lens is relatively dark, and the shooting quality of the optical lens is influenced; on the other hand, if the relative illuminance corresponding to the maximum angle of view of the optical lens is sufficiently large, the size of the photosensitive chip needs to be reduced, which may result in a small imaging surface and insufficient imaging information.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.26< TTL/FOV < 0.31; wherein, TTL is a distance on an optical axis from the incident area to an image plane of the optical lens (i.e. a total structural length of the optical lens), and FOV is a maximum field angle of the optical lens.
The first lens is limited by the structure of the incident area, the first reflection area, the second reflection area and the emergent area, so that the optical lens has a smaller total structural length and a larger field angle, and the requirement of the optical lens on the shooting range is met. When the angle of view of the optical lens is lower than the lower limit of the above relational expression, the field of view of the optical lens is too large, which easily causes too large distortion of the edge field of view, and the image edge may be distorted, thereby reducing the telephoto imaging quality of the optical lens. When the upper limit of the relation is exceeded, the total length of the optical lens is too large, which easily causes that the light rays of the marginal field of view are difficult to image in the effective pixel area of the imaging surface, which easily causes incomplete imaging information, and simultaneously also causes the whole optical lens to be larger, which cannot be applied to small products such as mobile phone cameras and the like.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.2< (L1R 3L 1R3Th)/(L1R 2L 1R2Th L) < 0.3; wherein L1R2 is a radius of curvature of the first reflective region at the optical axis, L1R2Th is an on-axis distance from the first reflective region to the second reflective region, L1R3 is a radius of curvature of the second reflective region at the optical axis, and L1R3Th is an on-axis distance from the second reflective region to the exit region.
When the limitation of the relational expression is satisfied, the distance and the bending degree between the first reflection area and the second reflection area are reasonably configured, and the first lens has strong bending force, so that the light rays incident to the optical lens from a large angle can be acquired, namely, the field angle range of the optical lens can be expanded. When the curvature radius of the second reflection area is smaller than the lower limit of the relational expression, the deflection angle of the light reflected by the second reflection area is smaller than the deflection angle of the light reflected by the second reflection area, so that the light is difficult to converge on the imaging surface, the field angle of the optical lens is too narrow, the optical lens is difficult to acquire more scene contents, and the imaging information of the optical lens is incomplete. When the distance between the first reflection area and the second reflection area exceeds the upper limit of the relational expression, the distance between the first reflection area and the second reflection area is too small, so that the optical path of the optical lens is too short, and the realization of the long-focus performance of the optical lens is not facilitated.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the first lens, the second lens and the third lens are plastic lenses. The degree of freedom of shape design of the first lens, the second lens and the third lens can be increased, which is beneficial to the manufacture of each lens and the correction of aberration, and is beneficial to reducing the manufacturing cost.
In a second aspect, the present invention discloses a camera module, which includes a photosensitive chip and the optical lens according to the first aspect, wherein the photosensitive chip is disposed on an image side of the optical lens. The camera module with the optical lens can shorten the total structural length of the optical lens to meet the requirements of a long-focus lens, so that the optical lens has the total optical path length meeting the corresponding multiplying power of the optical lens while meeting the light, thin and miniaturized design, the optical performance and the resolving power of the optical lens are improved, the shooting quality of the optical lens is improved, and clear imaging is realized.
In a third aspect, the invention further discloses an electronic device, which includes a housing and the camera module set according to the second aspect, and the camera module set is disposed on the housing. The electronic equipment with the camera module can shorten the total structural length of the optical lens to meet the requirements of a long-focus lens, so that the optical lens has the total optical path length meeting the corresponding multiplying power of the optical lens while meeting the light, thin and miniaturized design, the optical performance and the resolving power of the optical lens are improved, the shooting quality of the optical lens is improved, and clear imaging is realized.
Compared with the prior art, the invention has the beneficial effects that:
according to the optical lens, the camera module and the electronic device provided by the embodiment of the invention, the first lens of the optical lens is limited to be provided with the incident area, the first reflection area, the second reflection area and the emergent area, so that the total length of the structure of the optical lens can be compressed on the premise of not changing the total optical path length of the optical lens, the light, thin and small design of the optical lens is realized, meanwhile, the requirements of a telephoto lens can be met, the optical performance is improved, the resolution and the imaging definition of the optical lens are improved, the optical lens has a better imaging effect, and the high-definition imaging requirements of people on the optical lens are met; and further causing the optical lens to satisfy the following relational expression: 0.7< EFL/TTLc <1.2, when the limitation of the relational expression is met, the total length of the structure of the optical lens can be shortened, and meanwhile, the optical lens has longer total optical path length so as to meet the requirement of a telephoto lens, improve the optical performance and the resolving power of the optical lens, improve the shooting quality of the optical lens and realize clear imaging. When the lower limit of the relation is lower, the total length of the optical lens structure is lengthened, which is not favorable for the miniaturization design of the optical lens; if the upper limit of the above relation is exceeded, the total structural length of the optical lens becomes short, and it becomes difficult to meet the focal length design requirement of the telephoto lens.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical lens disclosed in a first embodiment of the present application;
fig. 2 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);
fig. 3 is a schematic structural diagram of an optical lens disclosed in the second embodiment of the present application;
fig. 4 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);
fig. 5 is a schematic structural diagram of an optical lens disclosed in the third embodiment of the present application;
fig. 6 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);
fig. 7 is a schematic structural diagram of an optical lens disclosed in a fourth embodiment of the present application;
fig. 8 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);
fig. 9 is a schematic structural diagram of an optical lens disclosed in a fifth embodiment of the present application;
fig. 10 is a light ray spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%);
fig. 11 is a schematic structural diagram of the camera module disclosed in the present application;
fig. 12 is a schematic structural diagram of an electronic device disclosed in the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "center", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the invention and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.
Furthermore, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
Furthermore, the terms "first," "second," and the like, are used primarily to distinguish one device, element, or component from another (the specific nature and configuration may be the same or different), and are not used to indicate or imply the relative importance or number of the indicated devices, elements, or components. "plurality" means two or more unless otherwise specified.
The technical solution of the present invention will be further described with reference to the following embodiments and the accompanying drawings.
Referring to fig. 1, according to a first aspect of the present application, the present application discloses an optical lens 100, where the optical lens 100 includes a first lens L1, a second lens L2, and a third lens L3 arranged in order from an object side to an image side along an optical axis O, an object side surface of the first lens L1 includes an incident region S1 far from the optical axis and a second reflective region S3 located at a near optical axis, an image side surface of the first lens L1 includes a first reflective region S2 far from the optical axis and an exit region S4 located at the near optical axis, incident light enters the first lens L1 through the incident region S1, is reflected through the first reflective region S2 and the second reflective region S3 in order and exits the first lens L1 through the exit region S4, that is, that, when imaging, light enters the first reflective region S2 of the first lens L1 from the incident region S635 of the first lens L1, and passes through the first reflective region S2 of the first lens L1 to the second reflective region S599 of the first lens L599, then the light is reflected to the exit region S4 of the first lens L1 through the second reflection region S3 of the first lens L1, and enters the second lens L2 and the third lens L3 in sequence through the second reflection region S4 of the first lens, and finally is imaged on the imaging surface 101 of the optical lens 100. The first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, and the third lens element L3 with negative refractive power.
Further, the incident region S1 of the first lens element L1 can be concave or convex at the paraxial region O, the first reflective region S2 of the first lens element L1 can be convex or concave at the paraxial region O, the second reflective region S3 of the first lens element L1 can be concave or convex at the paraxial region O, and the exit region S4 of the first lens element L1 can be convex or concave at the paraxial region O. The object-side surface S5 and the image-side surface S6 of the second lens element L2 may be concave at the paraxial region O. The object-side surface S7 of the third lens element L3 can be concave at the paraxial region O, and the image-side surface S8 of the third lens element L3 can be convex at the paraxial region O.
Considering that the optical lens 100 is mostly applied to electronic devices such as mobile phones, tablet computers, smartwatches, etc., the first lens L1, the second lens L2, and the third lens L3 may all be made of plastic, that is, the first lens L1, the second lens L2, and the third lens L3 may all be made of plastic lenses, so that the degree of freedom in shape design of the first lens L1, the second lens L2, and the third lens L3 may be increased, which is beneficial to the manufacture and aberration correction of each lens, and is also beneficial to the reduction of the manufacturing cost. Meanwhile, the first lens L1, the second lens L2, and the third lens L3 may be aspheric.
In some embodiments, the optical lens 100 further includes a stop, which may be an aperture stop or a field stop, for reducing stray light, which is helpful to improve image quality. The stop may be disposed between the exit region S4 of the first lens L1 and the object side surface S5 of the second lens L2. It is understood that, in other embodiments, the stop may also be disposed between the object side of the optical lens 100 and the incident region S1 of the first lens L1, that is, the disposed position of the stop may be adjusted according to actual situations, and this embodiment is not limited in this respect.
In some embodiments, the optical lens 100 further includes a filter L4, such as an infrared filter, disposed between the image side surface S8 of the third lens element L3 and the image plane 101 of the optical lens 100, so as to filter out light in other bands, such as visible light, and only allow infrared light to pass through, and therefore, the optical lens 100 can be used as an infrared optical lens, that is, the optical lens 100 can image in a dark environment and other special application scenes and can obtain a better image effect. It is understood that the optical filter L4 may be made of an optical glass coating film, a colored glass, or a filter made of other materials, which may be selected according to actual needs, and is not limited in this embodiment.
In some embodiments, the optical lens 100 satisfies the following relationship: 0.7< EFL/TTLc < 1.2; where EFL is an effective focal length of the optical lens 100, and TTLc is a total optical path length of the optical lens 100 in a direction parallel to the optical axis, where the total optical path length is a sum of an optical path of the incident light entering the first reflective region S2 through the incident region S1 in a direction parallel to the optical axis, an optical path of the incident light reflected to the second reflective region S3 through the first reflective region S2 in a direction parallel to the optical axis, an optical path of the incident light reflected to the exit region S4 through the second reflective region S3 in a direction parallel to the optical axis, and an optical path of the incident light entering the imaging surface 101 of the optical lens 100 through the exit region S4 in a direction parallel to the optical axis.
When the limitation of the above relation is satisfied, the total structural length of the optical lens 100 can be shortened, and meanwhile, the optical lens 100 has a longer total optical path length, so as to satisfy the requirements of a telephoto lens, improve the optical performance and the resolving power of the optical lens 100, improve the shooting quality of the optical lens 100, and realize clear imaging. When the lower limit of the above relation is lower, the total length of the optical lens 100 may be longer, which is not favorable for the miniaturization design of the optical lens 100; if the upper limit of the above relation is exceeded, the total length of the optical lens 100 becomes short, and it becomes difficult to satisfy the focal length design requirement of the telephoto lens.
In some embodiments, the optical lens 100 satisfies the following relationship: TTL/EFL < 0.6; wherein, TTL is a distance from the incident area S1 to the image plane 101 of the optical lens 100 on the optical axis O (i.e. a total structure length of the optical lens 100), and EFL is an effective focal length of the optical lens 100.
By reasonably controlling the ratio of the total structural length of the optical lens 100 to the effective focal length of the optical lens 100, the optical lens 100 can not only meet the miniaturization design requirement of the optical lens 100, but also realize the telephoto shooting function and the high-definition image shooting function of the optical lens 100, and simultaneously ensure that light rays can better converge on the imaging surface 101 of the optical lens 100. Specifically, the first lens L1 with two reflecting surfaces can effectively shorten the total length of the optical lens 100 while the optical lens 100 has a long focal length, and can introduce spherical aberration to the minimum extent to improve the optical performance of the optical lens 100. When the total length of the optical lens 100 is too short relative to the effective focal length of the optical lens 100, the sensitivity of the optical lens 100 is increased, and the light rays are not focused on the image plane.
In some embodiments, the optical lens 100 satisfies the following relationship: 0.2< YI/EPD < 0.5; where YI is half of the maximum field angle of the optical lens 100 corresponding to the image height, and EPD is the entrance pupil diameter of the optical lens 100.
The size of the entrance pupil diameter of the optical lens 100 is related to the f-number of the optical lens 100, and the f-number of the optical lens 100 determines the brightness of the captured image of the optical lens 100. Therefore, when the limitation of the above relation is satisfied, a large light flux amount of the optical lens 100 can be realized on the premise of maintaining the telephoto performance of the optical lens 100, that is, the optical lens 100 can have a better telephoto performance when the optical lens 100 is in the telephoto, and meanwhile, the optical lens 100 has a larger light flux amount, which is not only beneficial to making the shot image of the optical lens 100 clearer and achieving a better imaging effect; the optical lens 100 can acquire more scene contents, and imaging information of the optical lens 100 is enriched. Also, when the optical lens 100 has a large luminous flux per unit time, a clear imaging effect can be achieved even when photographing is performed in a dark environment. When the image height is lower than the lower limit of the above relational expression, the image height of the optical lens 100 is too small to match with a photosensitive chip with high pixels, so that high-pixel imaging is difficult to realize; when the ratio exceeds the upper limit of the above relational expression, the diameter of the entrance pupil of the optical lens 100 is too small, which may cause insufficient light flux and insufficient relative brightness of light, thereby causing a decrease in picture sensitivity, resulting in a darkening of an image captured by the optical lens 100, and affecting the quality of the captured image.
In some embodiments, the optical lens 100 satisfies the following relationship: 30< | L1R1|/| L1R2| < 1000; wherein L1R1 is the radius of curvature of the incident region S1 at the optical axis O, and L1R2 is the radius of curvature of the first reflective region S2 at the optical axis O.
Since the shape of the first lens L1 influences the overall length of the optical lens 100, when the above-mentioned limitation of the relation is satisfied, the overall length of the optical lens 100 can be prevented from being too long, which is beneficial to make the optical lens 100 conform to the miniaturized design. When the value is lower than the lower limit of the above relation, the ratio of the curvature radius of the incident region S1 at the optical axis O to the curvature radius of the first reflective region S2 at the optical axis O becomes smaller, which means that the absolute value of the curvature radius of the incident region S1 at the optical axis O becomes smaller or the absolute value of the curvature radius of the first reflective region S2 at the optical axis O becomes larger, and the angle of the incident region S1 becomes too large, so that the first lens L1 is difficult to machine and manufacture; if the ratio of the radius of curvature of the incident area S1 on the optical axis O to the radius of curvature of the first reflective area S2 on the optical axis O is larger than the upper limit of the above relation, this means that the absolute value of the radius of curvature of the incident area S1 on the optical axis O becomes larger or the absolute value of the radius of curvature of the first reflective area S2 on the optical axis O becomes smaller, and the angle of the incident area S1 is too small to meet the design requirement of the field angle of the telephoto lens.
In some embodiments, the optical lens 100 satisfies the following relationship: 40.0< RI/YI < 52.0; wherein RI is a relative illumination corresponding to the maximum field angle of the optical lens 100, and the relative illumination refers to: the ratio of the central illuminance to the peripheral illuminance of the optical lens 100, YI, is half of the image height corresponding to the maximum field angle of the optical lens 100.
When the limitation of the above relation is satisfied, the requirement of the optical lens 100 on relative illumination is favorably satisfied, the illumination of the edge field is favorably improved, and the luminance brightness of the optical lens 100 is higher, so that the shooting effect of the optical lens 100 in a dark light environment is enhanced, and the depth recognition accuracy of the optical lens 100 is improved. When the luminance is lower than the lower limit of the above relational expression, the relative illuminance corresponding to the maximum field angle of the optical lens 100 becomes low, which results in a small amount of peripheral light received by the light sensing chip, so that the luminance of the whole shooting picture of the optical lens 100 is relatively dark, and the shooting quality of the optical lens 100 is affected; on the other hand, if the relative illuminance corresponding to the maximum angle of view of the optical lens 100 is sufficiently large, the size of the photosensitive chip needs to be reduced, which may result in a small imaging surface 101 and insufficient imaging information.
In some embodiments, the optical lens 100 satisfies the following relationship: 0.26< TTL/FOV < 0.31; wherein, TTL is a distance from the incident area S1 to the image plane 101 of the optical lens 100 on the optical axis O (i.e. a total structural length of the optical lens 100), and the FOV is a maximum field angle of the optical lens 100.
Due to the structural limitation that the first lens L1 has the incident area S1, the first reflection area S2, the exit area S3 and the exit area S4, the optical lens 100 has a smaller overall structural length and a larger angle of view, so as to meet the requirement of the optical lens 100 on the shooting range. When the angle of view of the optical lens 100 is lower than the lower limit of the above relational expression, the distortion of the marginal field of view is easily caused to be too large, the image margin may be distorted, and the telephoto imaging quality of the optical lens 100 is reduced. When the upper limit of the above relation is exceeded, the total length of the optical lens 100 is too large, which easily causes that the light rays of the marginal field of view are difficult to be imaged in the effective pixel area of the imaging surface 101, which easily causes incomplete imaging information, and simultaneously, the whole optical lens 100 is also large, which cannot be applied to small products such as mobile phone cameras.
In some embodiments, the optical lens 100 satisfies the following relationship: the optical lens satisfies the following relation:
0.2< (L1R 3L 1R3Th)/(L1R 2L 1R2Th L) < 0.3; wherein L1R2 is a curvature radius of the first reflective region S2 on the optical axis O, L1R2Th is a distance between the first reflective region S2 and the second reflective region S3 on the optical axis O, L1R3 is a curvature radius of the second reflective region S3 on the optical axis O, and L1R3Th is a distance between the second reflective region S3 and the exit region S4 on the optical axis O.
When the definition of the above relation is satisfied, the distance and the bending degree between the first reflective region S2 and the second reflective region S3 are reasonably configured, and the first lens L1 has a strong bending force, thereby facilitating to obtain the light rays incident to the optical lens 100 from a large angle, i.e., being capable of expanding the field angle range of the optical lens 100. If the curvature radius of the second reflective region S3 is too small, the deflection angle of the light reflected by the second reflective region S3 is too small to converge on the imaging plane 100, which results in too narrow a field angle of the optical lens 100, and thus the optical lens 100 is difficult to acquire more scene content, resulting in incomplete imaging information of the optical lens 100. When the upper limit of the above relation is exceeded, the distance between the first reflective region S2 and the second reflective region S3 is too small, which results in too short an optical path of the optical lens 100, and is not favorable for realizing the telephoto performance of the optical lens 100.
The optical lens 100 of the present embodiment will be described in detail with reference to specific parameters.
First embodiment
In a configuration diagram of an optical lens 100 disclosed in the first embodiment of the present application, as shown in fig. 1, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, and a filter L4, which are sequentially disposed from an object side to an image side along an optical axis O. The first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, and the third lens element L3 with negative refractive power. For the materials of the first lens L1, the second lens L2, and the third lens L3, reference may be made to the above-mentioned embodiments, and further description is omitted here.
Further, the incident region S1, the first reflective region S2, the second reflective region S3 and the exit region of the first lens element L1 are respectively concave, convex, concave and convex at the paraxial region O; the object-side surface S5 and the image-side surface S6 of the second lens element L2 are both concave at the paraxial region O; the object-side surface S7 and the image-side surface S8 of the third lens element L3 are concave and convex, respectively, at the paraxial region O.
Specifically, other parameters of the optical lens 100 are given in table 1 below, taking as an example that the effective focal length EFL of the optical lens 100 is 11.78mm, the field angle FOV of the optical lens 100 is 19.45 °, the total structure length TTL of the optical lens 100 is 5.57mm, and the aperture size FNO is 1.90. The elements of the optical lens 100 from the object side to the image side along the optical axis O are arranged in the order of the elements from top to bottom in table 1. In the first lens L1, the numbers of surfaces of the incident region S1, the first reflective region S2, the second reflective region S3, and the exit region S4 increase in order, and for the second lens L2 and the third lens L3, in the same lens, the surface with the smaller number of surfaces is the object-side surface of the lens, and the surface with the larger number of surfaces is the image-side surface of the lens, and as in the case of the numbers 5 and 6, the object-side surface S5 and the image-side surface S6 of the second lens L2 correspond, respectively. The Y radius in table 1 is the radius of curvature of the object-side or image-side surface of the respective surface number at the paraxial region O. The first value in the "thickness" parameter list of a lens is the thickness of the lens on the optical axis O, and the second value is the distance from the image-side surface to the back surface of the lens on the optical axis O. The numerical value of the stop in the "thickness" parameter column is the distance from the stop to the vertex of the next surface (the vertex refers to the intersection point of the surface and the optical axis O) on the optical axis O, the direction from the incident area of the first lens L1 to the image side of the last lens is the positive direction of the optical axis O, when the value is negative, it indicates that the stop is disposed on the right side of the vertex of the next surface, and if the thickness of the stop is positive, the stop is disposed on the left side of the vertex of the next surface. It is understood that the units of the radius Y, thickness, and focal length in table 1 are all mm. And the reference wavelength of the effective focal length of each lens in table 1 is 555nm, and the reference wavelengths of the refractive index and abbe number of each lens are 587.6 nm.
TABLE 1
In the first embodiment, the object-side surface and the image-side surface of the incident region S1, the first reflective region S2, the second reflective region S3 and the exit region S4 of the first lens L1, and the object-side surface and the image-side surface of the second lens L2 and the third lens L3 are aspheric surfaces, and the surface shape x of each aspheric surface lens can be defined by, but is not limited to, the following aspheric surface formula:
wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex 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 1 above); k is the cone coefficient; ai is a correction coefficient corresponding to the high-order term of the ith aspheric term. Table 2 shows the high-order term coefficients A4, A6, A8, A10 and A12 which can be used for the respective aspherical mirrors S1-S8 in the first embodiment.
TABLE 2
Referring to fig. 2 (a), fig. 2 (a) shows a light spherical aberration curve of the optical lens 100 in the first embodiment at wavelengths of 470nm, 510nm, 555nm, 610nm and 663.77 nm. In fig. 2 (a), the abscissa in the X-axis direction represents the focus shift, and the ordinate in the Y-axis direction represents the normalized field of view. As can be seen from fig. 2 (a), the spherical aberration value of the optical lens 100 in the first embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.
Referring to fig. 2 (B), fig. 2 (B) is a diagram of astigmatism of light of the optical lens 100 in the first embodiment at a wavelength of 555 nm. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the image height in mm. The astigmatism curves represent the meridional image plane curvature T and the sagittal image plane curvature S, and it can be seen from (B) in fig. 2 that the astigmatism of the optical lens 100 is well compensated at this wavelength.
Referring to fig. 2 (C), fig. 2 (C) is a distortion curve diagram of the optical lens 100 in the first embodiment at a wavelength of 555 nm. Wherein the abscissa along the X-axis direction represents distortion and the ordinate along the Y-axis direction represents image height in mm. As can be seen from (C) in fig. 2, the distortion of the optical lens 100 is well corrected at a wavelength of 555 nm.
Second embodiment
Referring to fig. 3, fig. 3 is a schematic structural diagram of an optical lens 100 according to a second embodiment of the present application. The optical lens 100 includes a first lens L1, a second lens L2, and a third lens L3, which are disposed in order from the object side to the image side along the optical axis O. For the materials of the first lens element L1, the second lens element L2 and the third lens element L3, reference is made to the above-mentioned detailed description, and for the surface shape and refractive power of each lens element, reference is made to the above-mentioned first embodiment, which is not repeated herein.
In the second embodiment, the effective focal length EFL of the optical lens 100 is 11.78mm, the FOV of the field angle of the optical lens 100 is 20.12 °, the total length TTL of the structure of the optical lens 100 is 5.62mm, and the aperture size FNO is 1.87.
Other parameters in the second embodiment are given in the following table 3, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, which are not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 3 are all mm. And the reference wavelength of the effective focal length of each lens in table 3 is 555nm, and the reference wavelength of the refractive index, abbe number, of each lens is 587.6 nm.
TABLE 3
In the second embodiment, table 4 gives the high-order term coefficients that can be used for each aspherical mirror surface in the second embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.
TABLE 4
Referring to fig. 4, fig. 4 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens 100 according to the second embodiment, and specific definitions are described with reference to the first embodiment and will not be repeated herein. As can be seen from (a) in fig. 4, the spherical aberration value of the optical lens 100 in the second embodiment is better, which illustrates that the imaging quality of the optical lens 100 in the present embodiment is better. As can be seen from (B) in fig. 4, astigmatism of the optical lens 100 is well compensated at a wavelength of 555 nm. As can be seen from (C) in fig. 4, the distortion of the optical lens 100 is well corrected at a wavelength of 555 nm.
Third embodiment
Referring to fig. 5, fig. 5 is a schematic structural diagram of an optical lens 100 according to a third embodiment of the present application. The optical lens 100 includes a first lens L1, a second lens L2, and a third lens L3, which are disposed in order from the object side to the image side along the optical axis O. For the materials of the first lens element L1, the second lens element L2 and the third lens element L3, reference is made to the above-mentioned detailed description, and for the surface shape and refractive power of each lens element, reference is made to the above-mentioned first embodiment, which is not repeated herein.
In the third embodiment, the effective focal length EFL of the optical lens 100 is 11.77mm, the FOV of the field angle of the optical lens 100 is 19.95 °, the total length TTL of the structure of the optical lens 100 is 5.55mm, and the aperture size FNO is 1.87 are taken as examples.
Other parameters in the third embodiment are shown in the following table 5, and the definitions of the parameters can be obtained from the foregoing description, which is not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 5 are mm. And the reference wavelength of the effective focal length of each lens in table 5 is 555nm, and the reference wavelength of the refractive index and abbe number of each lens is 587.6 nm.
TABLE 5
In the third embodiment, table 6 gives the high-order term coefficients 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 6
Referring to fig. 6, fig. 6 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens 100 according to the third embodiment, and specific definitions are described with reference to the first embodiment and will not be repeated herein. As can be seen from (a) in fig. 6, the spherical aberration value of the optical lens 100 in the third embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better. As can be seen from (B) in fig. 6, astigmatism of the optical lens 100 is well compensated at a wavelength of 555 nm. As can be seen from (C) in fig. 6, the distortion of the optical lens 100 is well corrected at a wavelength of 555 nm.
Fourth embodiment
Fig. 7 is a schematic structural diagram of an optical lens 100 according to a fourth embodiment of the present disclosure. The optical lens 100 includes a first lens L1, a second lens L2, and a third lens L3, which are disposed in order from the object side to the image side along the optical axis O. For the materials of the first lens element L1, the second lens element L2 and the third lens element L3, reference is made to the above-mentioned detailed description, and for the surface shape and refractive power of each lens element, reference is made to the above-mentioned first embodiment, which is not repeated herein.
In the fourth embodiment, the focal length EFL of the optical lens 100 is 12.15mm, the FOV of the field angle of the optical lens 100 is 18.78 °, the total configuration length TTL of the optical lens 100 is 5.13mm, and the aperture size FNO is 1.94.
Other parameters in the fourth embodiment are shown in the following table 7, and the definitions of the parameters can be obtained from the foregoing description, which is not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 7 are mm. And the reference wavelength of the effective focal length of each lens in table 7 is 555nm, and the reference wavelength of the refractive index and abbe number of each lens is 587.6 nm.
TABLE 7
In the fourth embodiment, table 8 gives the high-order term coefficients 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 8
Referring to fig. 8, fig. 8 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens 100 according to the fourth embodiment, and specific definitions are described with reference to the first embodiment and will not be repeated herein. As can be seen from (a) in fig. 8, the spherical aberration value of the optical lens 100 in the fourth embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better. As can be seen from (B) in fig. 8, astigmatism of the optical lens 100 is well compensated at a wavelength of 555 nm. As can be seen from (C) in fig. 8, the distortion of the optical lens 100 is well corrected at a wavelength of 555 nm.
Fifth embodiment
Fig. 9 is a schematic structural diagram of an optical lens 100 according to a fifth embodiment of the present application. The optical lens 100 includes a first lens L1, a second lens L2, and a third lens L3, which are disposed in order from the object side to the image side along the optical axis O. For the materials of the first lens element L1, the second lens element L2 and the third lens element L3, reference is made to the above-mentioned detailed description, and for the surface shape and refractive power of each lens element, reference is made to the above-mentioned first embodiment, which is not repeated herein.
In the fifth embodiment, the focal length EFL of the optical lens 100 is 11.77mm, the FOV of the field angle of the optical lens 100 is 19.46 °, the total configuration length TTL of the optical lens 100 is 5.71mm, and the aperture size FNO is 2.07 are taken as examples.
The other parameters in the fifth embodiment are shown in the following table 9, and the definitions of the parameters can be obtained from the foregoing description, which is not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 9 are mm. And the reference wavelength of the effective focal length of each lens in table 9 is 555nm, and the reference wavelength of the refractive index and abbe number of each lens is 587.6 nm.
TABLE 9
In the fifth embodiment, table 10 gives 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.
Watch 10
Referring to fig. 10, fig. 10 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens 100 according to the fifth embodiment, and specific definitions are described in the first embodiment and will not be repeated herein. As can be seen from (a) in fig. 10, the spherical aberration value of the optical lens 100 in the fifth embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better. As can be seen from (B) in fig. 10, astigmatism of the optical lens 100 is well compensated at a wavelength of 555 nm. As can be seen from (C) in fig. 10, the distortion of the optical lens 100 is well corrected at a wavelength of 555 nm.
Referring to table 11, table 11 summarizes ratios of the relations in the first embodiment to the fifth embodiment of the present application.
Watch 15
Referring to fig. 11, the present application further discloses a camera module 200, which includes a photo sensor 201 and the optical lens 100 according to any of the first to fifth embodiments, wherein the photo sensor 201 is disposed at an image side of the optical lens 100. The optical lens 100 may be configured to receive a light signal of a subject and project the light signal to the light sensing chip 201, and the light sensing chip 201 may be configured to convert the light signal corresponding to the subject into an image signal. And will not be described in detail herein. It can be understood that the electronic device having the camera module 200 can shorten the total structural length of the optical lens 100 to satisfy the light, thin and miniaturized design, and at the same time, the optical lens 100 has the total optical path length satisfying the corresponding magnification to satisfy the requirement of the telephoto lens, thereby improving the optical performance and resolution of the optical lens 100, improving the shooting quality of the optical lens 100, and realizing clear imaging. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they are not described herein again.
Referring to fig. 12, the present application further discloses an electronic device, where the electronic device 300 includes a housing 301 and the camera module 200 as described above, and the camera module 200 is disposed on the housing 301 to obtain image information. The electronic device 300 may be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a smart watch, a monitor, and the like. It can be understood that the electronic device 300 having the camera module 200 also has all the technical effects of the optical lens 100. That is, the electronic device 300 can shorten the total structural length of the optical lens 100 to satisfy the light, thin and miniaturized design, and at the same time, the optical lens 100 has the total optical path length satisfying the corresponding magnification to satisfy the requirement of the telephoto lens, thereby improving the optical performance and the resolution of the optical lens 100, improving the shooting quality of the optical lens 100, and realizing clear imaging. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they are not described herein again.
The optical lens, the camera module and the electronic device disclosed by the embodiment of the invention are described in detail, a specific example is applied in the description to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the optical lens, the camera module and the electronic device and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. An optical lens includes a first lens, a second lens, and a third lens arranged in this order from an object side to an image side along an optical axis;
the first lens element with positive refractive power has an object-side surface including an incident region far from an optical axis and a second reflecting region located at a paraxial axis, and an image-side surface including a first reflecting region far from the optical axis and an exit region located at the paraxial axis, wherein incident light enters the first lens element through the incident region, is reflected by the first reflecting region and the second reflecting region in sequence, and exits the first lens element through the exit region;
the second lens element with negative refractive power has a concave object-side surface at a paraxial region thereof and a concave image-side surface at a paraxial region thereof;
the third lens element with negative refractive power has a concave object-side surface at a paraxial region thereof and a convex image-side surface at a paraxial region thereof;
the optical lens satisfies the following relation:
0.7<EFL/TTLc<1.2；
and EFL is the effective focal length of the optical lens, and TTLc is the total optical path length of the optical lens in the direction parallel to the optical axis.
2. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:
TTL/EFL<0.6；
wherein, TTL is a distance on an optical axis from the incident area to an imaging plane of the optical lens.
3. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:
0.2<YI/EPD<0.5；
wherein YI is half of the image height corresponding to the maximum field angle of the optical lens, and EPD is the entrance pupil diameter of the optical lens.
4. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:
30<|L1R1|/|L1R2|<1000；
wherein L1R1 is the radius of curvature of the incident region at the optical axis, and L1R2 is the radius of curvature of the first reflective region at the optical axis.
5. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:
40.0<RI/YI<52.0；
wherein RI is a relative illuminance corresponding to the maximum field angle of the optical lens, and YI is half of a height of an image corresponding to the maximum field angle of the optical lens.
6. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:
0.26<TTL/FOV<0.31；
wherein, TTL is a distance on an optical axis from the incident area to an imaging plane of the optical lens, and FOV is a maximum field angle of the optical lens.
7. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:
0.2<(L1R3*L1R3Th)/(L1R2*|L1R2Th|)<0.3；
wherein L1R2 is a radius of curvature of the first reflective region at the optical axis, L1R2Th is an on-axis distance from the first reflective region to the second reflective region, L1R3 is a radius of curvature of the second reflective region at the optical axis, and L1R3Th is an on-axis distance from the second reflective region to the exit region.
8. An optical lens according to claim 1, wherein the first lens, the second lens and the third lens are plastic lenses.
9. A camera module, comprising a photo sensor chip and the optical lens of any one of claims 1-8, wherein the photo sensor chip is disposed on an image side of the optical lens.
10. An electronic device, comprising a housing and the camera module of claim 9, wherein the camera module is disposed in the housing.
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| CN202111319701.8A CN114002814A (en) | 2021-11-09 | 2021-11-09 | Optical lens, camera module and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024120514A1 (en) * | 2022-12-09 | 2024-06-13 | 华为技术有限公司 | Telephoto lens, camera module, and electronic device |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024120514A1 (en) * | 2022-12-09 | 2024-06-13 | 华为技术有限公司 | Telephoto lens, camera module, and electronic device |
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Application publication date: 20220201 |