CN111781703A - Optical lens, camera module and terminal - Google Patents

Optical lens, camera module and terminal Download PDF

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Publication number
CN111781703A
CN111781703A CN202010697036.5A CN202010697036A CN111781703A CN 111781703 A CN111781703 A CN 111781703A CN 202010697036 A CN202010697036 A CN 202010697036A CN 111781703 A CN111781703 A CN 111781703A
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lens
optical lens
optical
image
satisfies
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黄怀毅
李宗政
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OFilm Microelectronics Technology Co Ltd
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OFilm Microelectronics Technology Co Ltd
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Priority to CN202010697036.5A priority Critical patent/CN111781703A/en
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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
    • 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
    • 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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  • Optics & Photonics (AREA)
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Abstract

The application provides an optical lens, a camera module and a terminal. The optical lens comprises a first lens, a second lens and a third lens which are arranged in sequence from an object side to an image side along an optical axis; the first lens element with negative refractive power has a concave image-side surface; the second lens element with positive refractive power has a convex object-side surface; the third lens element with positive refractive power has a convex image-side surface; the optical lens satisfies the following relationship: FL2/FL1< -1.40, FL2/FL3>1.18, and FL/TTL > 0.190. The optical lens with the three-piece structure is easy to produce and convenient to assemble, can realize shorter total length of the lens and is beneficial to realizing thinning when the relationship that FL/TTL is more than 0.190 is met, and simultaneously has better imaging quality because the number of the lens pieces is less, the light penetration rate of the optical lens is higher; in addition, when each lens element of the optical lens has the refractive power and the convex-concave design of the object side surface and the image side surface and meets the relations of FL2/FL1< -1.40 and FL2/FL3>1.18, the wide-angle light rays can be effectively collected, and the effects of large aperture and wide field angle are achieved.

Description

Optical lens, camera module and terminal
Technical Field
The application relates to the technical field of optical imaging, in particular to an optical lens, a camera module and a terminal.
Background
In recent years, with the progress of the scientific and technological industry, the imaging technology is continuously developed, and the optical lens of the optical imaging is widely applied to terminals such as smart phones, tablets, image capture, sensing, security, 3D identification, automation equipment and the like. Especially, the market scale of wide-angle lenses is gradually increasing, because if one lens can reach a large image capture range, more than two lenses are not needed. Especially in the fields of security and 3D identification, an optical lens with low power consumption, small volume and thinness is generally needed. However, the conventional wide-angle lens generally has the problems of large size and long lens length, and particularly, some methods of implementing a wide angle by using more than 2 lenses have the disadvantages of large size, large thickness, large area, and the like, and are particularly not suitable for being applied to a terminal with a requirement of thinning, and improvement is needed.
Disclosure of Invention
In view of the above, it is desirable to provide an optical lens, an image pickup module and a terminal with a thin and wide field angle.
In a first aspect, an embodiment of the present application provides 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; wherein the content of the first and second substances,
the first lens element with negative refractive power has a concave image-side surface;
the second lens element with positive refractive power has a convex object-side surface;
the third lens element with positive refractive power has a convex image-side surface;
the optical lens satisfies the following relationship:
FL2/FL1< -1.40; FL2/FL3> 1.18; and FL/TTL > 0.190;
wherein FL1 is the focal length of said first lens; FL2 is the focal length of the second lens; FL3 is the focal length of the third lens; FL is the focal length of the optical lens; TTL is the total length of the optical lens.
In the optical lens provided by the embodiment of the application, the three-piece lens with less lens pieces is adopted, so that the production is easy, the assembly is convenient, when the relationship that FL/TTL is more than 0.190 is met, the total length of the lens is short, the thinning is facilitated, and meanwhile, the optical lens has higher light penetration rate and better imaging quality due to less lens pieces; in addition, when each lens element of the optical lens has the refractive power and the convex-concave design of the object side surface and the image side surface and meets the relations of FL2/FL1< -1.40 and FL2/FL3>1.18, the wide-angle light rays can be effectively collected, and the effects of large aperture and wide field angle are achieved.
In one embodiment, the optical lens satisfies the following relationship:
Y′/FL>1.5；
wherein Y' is a half height of an image of the optical lens. When the relation is met, the wide-angle light can be effectively collected, and the effect of wide field angle is achieved; meanwhile, the total length of the optical lens is shortened, so that the optical lens is thinned.
In one embodiment, the refractive index of the second lens is greater than the refractive indices of the first lens and the third lens. The second lens is thinner and lighter due to the larger refractive index of the second lens, and the thinning of the optical lens is facilitated.
In one embodiment, the optical lens satisfies the following relationship:
NdL2>1.60；
wherein NdL2 is the refractive index of the second lens. When the above relation is satisfied, the thickness and weight of the second lens can be effectively reduced, so that the optical lens is light and thin.
In one embodiment, the optical lens satisfies the following relationship:
NdL1<1.59；
NdL3<1.59；
wherein NdL1 is the refractive index of the first lens, and NdL3 is the refractive index of the third lens. When the above relation is satisfied, a large-viewing-angle light ray can enter the optical lens, and chromatic aberration correction can be facilitated, so that a good imaging effect can be obtained.
In one embodiment, the optical lens satisfies the following relationship:
TTL/Y′<3.0；
wherein, TTL is the total length of the optical lens. When the relation is met, the optical total length of the optical lens can be effectively compressed, and the requirement of miniaturization design is further met.
In one embodiment, the optical lens further comprises a diaphragm, the diaphragm being located between the second lens and the third lens; the optical lens satisfies the following relation:
FOV >140 degrees;
wherein the FOV is the angle of view of the optical lens. Therefore, the optical lens has a large field angle and a large image capturing range, and is convenient for observing surrounding objects.
In one embodiment, the optical lens satisfies the following relationship:
FNO<2.8；
wherein the FNO is the f-number of the optical lens. When the above relation is satisfied, the light inlet quantity of the optical lens is high, so that the imaging effect under a dark environment is good, and the optical lens is favorably applied to multiple fields.
In one embodiment thereof, the optical lens satisfies a distortion rate of greater than-60%. Therefore, the optical lens controls the distortion rate on the basis of using the three-piece lens to achieve thinning and wide field angle, thereby obtaining better imaging effect.
In a second aspect, an embodiment of the present application provides an image capturing module, including the optical lens and the image sensor of any of the above embodiments, wherein the optical lens is configured to receive an optical signal of a subject and project the optical signal to the image sensor, and the image sensor is configured to convert the optical signal corresponding to the subject into an image signal.
The embodiment of the application provides in the module of making a video recording, owing to adopt the optical lens of above-mentioned arbitrary embodiment, it is easy, with lower costs to have production equally, be convenient for the equipment, the camera lens overall length is shorter, is favorable to realizing the slimming, the light penetration rate is higher, imaging quality also preferred, big light ring, wide angle of view etc. technical effect.
In a third aspect, an embodiment of the present application provides a terminal, including the camera module in the foregoing embodiment.
The embodiment of the application provides in the terminal, owing to adopt above-mentioned module of making a video recording, it is easy, with lower costs to have production equally, be convenient for the equipment, the camera lens overall length is shorter, be favorable to realizing the slimming, the light penetration rate is higher, imaging quality is also technical effect such as preferred, big light ring, wide field angle.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or related technologies of the present application, the drawings needed to be used in the description of the embodiments or related technologies are briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical lens provided in a first embodiment of the present application.
Fig. 2 is a diagram showing a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical lens in the first embodiment.
Fig. 3 is a schematic structural diagram of an optical lens according to a second embodiment of the present application.
Fig. 4 is a diagram showing a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical lens in the second embodiment.
Fig. 5 is a schematic structural diagram of an optical lens provided in a third embodiment of the present application.
Fig. 6 is a diagram showing a spherical aberration diagram (mm), an astigmatism diagram (mm), and a distortion diagram (%) of the optical lens in the second embodiment.
Fig. 7 is a schematic view of a camera module according to an embodiment of the present application.
Fig. 8 is a schematic diagram of a terminal according to an embodiment of the present application.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "inner", "outer", "left", "right" and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
According to a first aspect of the present application, an optical lens is provided. Referring to fig. 1, 3 and 5, an optical lens 100 in the present application includes, in order from an object side to an image side along an optical axis, a first lens element L1 with negative refractive power, a second lens element L2 with positive refractive power and a third lens element L3 with positive refractive power.
The first lens L1 includes an object-side surface S1 and an image-side surface S2, the second lens L2 includes an object-side surface S3 and an image-side surface S4, and the third lens L3 includes an object-side surface S5 and an image-side surface S6. The image-side surface S2 of the first lens element L1 is concave. The object-side surface S3 of the second lens L2 is convex. The image-side surface S6 of the third lens element L3 is convex. Specifically, the image-side surface S2 of the first lens L1 is concave at the optical axis. The object-side surface S3 of the second lens L2 is convex at the optical axis. The image-side surface S6 of the third lens element L3 is convex on the optical axis.
In some embodiments, the first lens L1, the second lens L2, and the third lens L3 may be spherical lenses, aspherical lenses, or free-form lenses. Wherein, the aspheric surface parameter formula is as follows:
Figure BDA0002591516510000041
wherein X is the point on the aspheric surface which is Y away from the optical axis and the relative distance between the point and the tangent plane tangent to the intersection point on the aspheric surface optical axis; y is the perpendicular distance between the point on the aspheric curve and the optical axis, R is the curvature radius, k is the cone coefficient, and Ai is the aspheric coefficient of the ith order.
In some embodiments, the first lens L1, the second lens L2, and the third lens L3 may be made of plastic, and the plastic lens can reduce the weight of the optical lens 100 and the production cost.
In some embodiments, the first lens L1, the second lens L2, and the third lens L3 are made of glass, and the glass lens can withstand higher temperature and has better optical performance.
In other embodiments, only the first lens element L1 may be made of glass, and the other lens elements may be made of plastic, in which case, the first lens element L1 closest to the object side can better withstand the environment with a higher object side temperature, and the production cost of the optical lens 100 can also be reduced because the other lens elements are made of plastic.
In addition, the optical lens 100 further includes a stop STO, which may be an aperture stop, disposed between the second lens L2 and the third lens L3. An image plane S8 may be further disposed on the image side of the third lens L3, and the image plane S8 may be a surface of the image sensor. It is understood that the light rays carrying the subject information can pass through the first lens L1, the second lens L2, the stop STO, and the third lens L3 in this order and finally form an image on the image plane S8.
In some embodiments, an infrared filter may be further disposed on the image side of the third lens L3. In other embodiments, an infrared filter may also be disposed on the object side of the first lens L1. By arranging the infrared filter, the optical lens 100 can filter out infrared light, so that the infrared light is prevented from reaching the image sensor to interfere with normal visible light imaging, and the imaging quality is improved. It should be noted that, in some embodiments, the optical lens 100 may not include the infrared filter and the image sensor, and in this case, the infrared filter may be disposed in the camera module when the optical lens 100 and the image sensor are packaged together into the camera module.
Further, the optical lens 100 satisfies the following relationship: FL2/FL1< -1.40; FL2/FL3> 1.18; and FL/TTL > 0.190; wherein FL1 is the focal length of first lens L1; FL2 is the focal length of second lens L2; FL3 is the focal length of third lens L3; FL is the focal length of the optical lens 100; TTL is the total length of the optical lens 100.
In the optical lens 100 provided in the embodiment of the present application, since three lenses with a small number of lenses are adopted, the production is easy, the assembly is convenient, when the relationship that FL/TTL >0.190 is satisfied, the total length of the lens is short, and the thinning is facilitated, and meanwhile, since the number of lenses is small, the optical transmittance of the optical lens is high, and the imaging quality is also good; in addition, when each lens element of the optical lens has the refractive power and the convex-concave design of the object side surface and the image side surface and meets the relations of FL2/FL1< -1.40 and FL2/FL3>1.18, the wide-angle light rays can be effectively collected, and the effects of large aperture and wide field angle are achieved.
In some embodiments, optical lens 100 satisfies the following relationship: y is＇/FL>1.5; wherein, Y＇Which is half the height of the image of the optical lens 100, FL is the focal length of the optical lens 100. When the above relationship is satisfied, the wide-angle light can be effectively collected, the effect of a wide field angle is achieved, and the total length of the optical lens 100 is also shortened, so that the optical lens 100 is thinned.
In some embodiments, optical lens 100 satisfies the following relationship: the refractive index of the second lens L2 is greater than the refractive index of the first lens L1 and the refractive index of the third lens. Since the refractive index of the second lens L2 is large, the second lens can be thinner and lighter, which is beneficial to implementing the thinning of the optical lens 100.
Specifically, the optical lens 100 satisfies the following relationship: NdL2> 1.60; NdL2 represents the refractive index of the second lens L2. In some embodiments, NdL2 may be 1.637, 1.638, or 1.639. When the above relationship is satisfied, the thickness and weight of the second lens element L2 can be effectively reduced, so that the optical lens 100 is light and thin.
Preferably, the optical lens 100 satisfies the following relationship: NdL1< 1.59; NdL3< 1.59; wherein NdL1 is the refractive index of the first lens L1, and NdL3 is the refractive index of the third lens L3. In some embodiments, NdL1 and NdL3 may be 1.544 or 1.536, respectively. When the above relationship is satisfied, it is advantageous for light with a large viewing angle to enter the optical lens 100, and chromatic aberration correction can be facilitated, thereby obtaining a good imaging effect.
In some embodiments, optical lens 100 satisfies the following relationship: TTL/Y＇<3.0; wherein TTL is the total length of the optical lens 100. In some embodiments, TTL/Y＇The relationship of (a) may be 2.16 or 2.83. When the above relationship is satisfied, the total optical length of the optical lens 100 can be effectively compressed, thereby satisfying the requirement of miniaturization design.
In some embodiments, optical lens 100 satisfies the following relationship: FOV >140 degrees; where FOV is the angle of view of the optical lens 100. In some embodiments, the FOV may be 148.4 degrees, 147.9 degrees, or 156 degrees. As can be seen, the optical lens 100 has a large field angle and a large image capture range, so as to facilitate observation of surrounding objects.
In some embodiments, optical lens 100 satisfies the following relationship: FNO < 2.8; wherein FNO is the f-number of the optical lens 100. In some embodiments, the FNO may be 2.75 or 2.8. The light entering amount of the optical lens 100 is high, so that the imaging effect in a dark environment is good, and the optical lens 100 is also beneficial to being applied to multiple fields.
In some embodiments, the optical lens 100 satisfies a distortion rate of greater than-60%. As can be seen, the optical lens 100 controls the distortion rate on the basis of achieving the thinness and wide field angle by using the three-piece lens, thereby obtaining a better imaging effect.
First embodiment
In the first embodiment, as shown in fig. 1, the optical lens 100 includes, in order from an object side to an image side, a first lens element L1 with negative refractive power, a second lens element L2 with positive refractive power, a stop STO, and a third lens element L3 with positive refractive power.
Specifically, the object-side surface S1 of the first lens element L1 is convex and the image-side surface S2 is concave; the object-side surface S1 of the first lens element L1 is convex at the circumference, and the image-side surface S2 is concave at the circumference; the object-side surface S3 of the second lens element L2 is convex along the optical axis, and the image-side surface S4 is concave along the optical axis; the object-side surface S3 of the second lens element L2 is convex at the circumference, and the image-side surface S4 is convex at the circumference; the object-side surface S5 of the third lens element L3 is convex along the optical axis, and the image-side surface S6 is convex along the optical axis; the object-side surface S5 of the third lens element L3 is concave at the circumference, and the image-side surface S6 is convex at the circumference.
Further, the object-side surfaces S1, S3, and S5 and the image-side surfaces S2, S4, and S6 of the first lens L1, the second lens L2, and the third lens L3 are aspheric. The first lens L1, the second lens L2 and the third lens L3 are all made of plastic. The optical lens 100 has a three-piece lens structure, which is advantageous for miniaturization, and when applied to a camera module and a terminal, is also advantageous for reducing the size of the camera module and the terminal.
Specifically, in the first embodiment, the optical lens 100 also satisfies the following relationship: FL2/FL1 ═ -1.4270; FL2/FL3 ═ 1.2816; and FL/TTL 0.2385; wherein FL1 is the focal length of first lens L1; FL2 is the focal length of second lens L2; FL3 is the focal length of third lens L3; FL is the focal length of the optical lens 100; TTL is the total length of the optical lens 100. Because of using the three-piece lens with less lens pieces, the production is easy, the assembly is convenient, when FL/TTL is 0.2385, the total length of the lens can be shorter, the thinning can be realized, and simultaneously, because of less lens pieces, the light penetration rate of the optical lens is higher, and the imaging quality is better; in addition, when each lens element of the optical lens has the above-mentioned refractive power and convex-concave design of the object side surface and the image side surface and satisfies the relationship of FL2/FL 1-1.4270 and FL2/FL 3-1.2816, the optical lens can also effectively collect light rays with large angle of view, thereby achieving the efficacy of large aperture and wide angle of view.
Further, in the first embodiment, Y＇1.935/FL; wherein, Y＇Which is half the height of the image of the optical lens 100, FL is the focal length of the optical lens 100. When the above relationship is satisfied, the wide-angle light can be effectively collected, the effect of a wide field angle is achieved, and the total length of the optical lens 100 is also shortened, so that the optical lens 100 is thinned.
Further, in the first embodiment, NdL2 ═ 1.637; NdL2 represents the refractive index of the second lens L2. When the above relationship is satisfied, the thickness and weight of the second lens element L2 can be effectively reduced, so that the optical lens 100 is light and thin. NdL1 ═ 1.544; NdL3 ═ 1.544; wherein NdL1 is the refractive index of the first lens L1, and NdL3 is the refractive index of the third lens L3. When the above relationship is satisfied, a light ray favorable for a large angle of view enters the optical lens 100, and chromatic aberration correction can be facilitated, thereby obtaining a good image.
Further, in the first embodiment, TTL/Y＇2.16; wherein TTL is the total length of the optical lens 100. When the above relationship is satisfied, the total optical length of the optical lens 100 can be effectively compressed, thereby satisfying the requirement of miniaturization design.
Further, in the first embodiment, FOV is 148.4 degrees; where FOV is the angle of view of the optical lens 100. Satisfying the above relationship is advantageous for the optical lens 100 to capture a wide range of images, thereby facilitating observation of surrounding objects.
Further, in the first embodiment, FNO is 2.75; wherein FNO is the optical lens 100 f-number. When the above relationship is satisfied, the optical lens 100 has excellent image pickup performance, and is advantageous for satisfying the characteristic of high relative illuminance.
Further, in the first embodiment, the half height Y of the image formation of the optical lens 100＇0.6mm, 0.31mm for focal length FL, 2.75 for f-number FNO, 148.4 for maximum viewing angle FOVDegree of rotationTotal track length TTL of the optical lens 100＝1.3mm。
In addition, each parameter of the optical lens 100 is given by table 1 and table 2. In this case, the elements from the object side to the image side are sequentially arranged in the order of the elements from top to bottom in table 1. In the same lens, the surface with the smaller surface number is the object side surface of the lens, and the surface with the larger surface number is the image side surface of the lens, and for example, the surface numbers 1 and 2 correspond to the object side surface S1 and the image side surface S2 of the first lens L1, respectively. The radii in table 1 are the radii of curvature of the object-side or image-side surfaces of the respective surface numbers at the optical axis. The first value in the "thickness" parameter column of the first lens element L1 is the thickness of the lens element along the optical axis (center thickness), and the second value is the distance from the image-side surface of the lens element to the object-side surface of the subsequent lens element along the optical axis. The numerical value of the diaphragm in the "thickness" parameter column is the distance on the optical axis from the diaphragm to the vertex of the object-side surface of the next lens (the vertex refers to the intersection point of the lens and the optical axis), the direction from the object-side surface of the first lens to the image-side surface of the last lens is the positive direction of the optical axis by default, when the value is negative, the diaphragm is arranged on the right side of the vertex of the object-side surface of the next lens, and if the thickness of the diaphragm is a positive value, the diaphragm is arranged on the left side of the vertex of the object-side surface. The value of the air space in the "thickness" parameter column is the distance on the optical axis from the image-side surface S6 to the image surface S8 of the third lens L3. Table 2 is a table of the relevant parameters of the aspheric surface of each lens in table 1, where k is the cone coefficient and Ai is the i-th order aspheric coefficient.
The refractive index, Abbe number and focal length of each lens are values at a reference wavelength (e.g., 486.1327 nm).
TABLE 1
Figure BDA0002591516510000081
Figure BDA0002591516510000091
TABLE 2
Figure BDA0002591516510000092
Further, referring to fig. 2(a), fig. 2(a) is a light spherical aberration curve diagram of the first embodiment at 656.2725nm, 587.5618nm and 486.1327 nm. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the normalized field of view. As can be seen from fig. 2(a), the spherical aberration values at the wavelengths of 656.2725nm, 587.5618nm and 486.1327nm are better, which illustrates the better imaging quality of the optical lens assembly in this embodiment.
Referring to fig. 2(B), fig. 2(B) is a diagram of astigmatism of light beams at 656.2725nm, 587.5618nm and 486.1327nm in the first embodiment. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height. It can be seen from fig. 2(B) that the astigmatism corresponding to the three wavelengths is well compensated.
Referring to FIG. 2(C), FIG. 2(C) is a graph of distortion at a wavelength of 486.1327nm in the first embodiment. Wherein the abscissa in the X-axis direction represents the distortion rate and the ordinate in the Y-axis direction represents the image height. It can be seen from FIG. 2(C) that the distortion at the wavelength of 486.1327nm is more than-60%, which is well corrected.
Second embodiment
In the second embodiment, as shown in fig. 3, the optical lens 100 includes, in order from an object side to an image side, a first lens element L1 with negative refractive power, a second lens element L2 with positive refractive power, a stop STO and a third lens element L3 with positive refractive power.
The object-side surface S1 of the first lens element L1 is concave along the optical axis, and the image-side surface S2 is concave along the optical axis; the object-side surface S1 of the first lens element L1 is concave at its circumference, and the image-side surface S2 is concave at its circumference; the object-side surface S3 of the second lens element L2 is convex along the optical axis, and the image-side surface S4 is concave along the optical axis; the object-side surface S3 of the second lens element L2 is convex at the circumference, and the image-side surface S4 is convex at the circumference; the object-side surface S5 of the third lens element L3 is convex along the optical axis, and the image-side surface S6 is convex along the optical axis; the object-side surface S5 of the third lens element L3 is convex at the circumference, and the image-side surface S6 is convex at the circumference.
Further, the object-side surfaces S1, S3, and S5 and the image-side surfaces S2, S4, and S6 of the first lens L1, the second lens L2, and the third lens L3 are aspheric. The first lens L1, the second lens L2 and the third lens L3 are all made of plastic. The optical lens 100 has a three-piece lens structure, which is advantageous for miniaturization, and when applied to a camera module and a terminal, is also advantageous for reducing the size of the camera module and the terminal.
Specifically, in the first embodiment, the optical lens 100 also satisfies the following relationship: FL2/FL1 ═ -2.1029; FL2/FL3 ═ 3.3568; and FL/TTL 0.1906; wherein FL1 is the focal length of first lens L1; FL2 is the focal length of second lens L2; FL3 is the focal length of third lens L3; FL is the focal length of the optical lens 100; TTL is the total length of the optical lens 100. Because of using the three-piece lens with less lens pieces, the production is easy, the assembly is convenient, when FL/TTL is 0.1906, the total length of the lens can be shorter, the thinning can be realized, and simultaneously, because of less lens pieces, the light penetration rate of the optical lens is higher, and the imaging quality is better; in addition, when each lens element of the optical lens has the above-mentioned refractive power and convex-concave design of the object side surface and the image side surface and satisfies the relationship of FL2/FL 1-2.1029 and FL2/FL 3-3.3568, the optical lens can also effectively collect light rays with large angle of view, thereby achieving the efficacy of large aperture and wide angle of view.
In addition, the parameters of the optical lens 100 are given in tables 3 and 4, and the definitions of the parameters can be obtained from the first embodiment, which is not repeated herein.
In the second embodiment, half height Y of imaging of the optical lens 100＇0.6mm, 0.325mm for the focal length FL, 2.8 for the f-number FNO, 147.9 for the maximum field of view FOV, and 1.7mm for the total length TTL of the optical lens 100.
TABLE 3
Figure BDA0002591516510000101
Figure BDA0002591516510000111
TABLE 4
Figure BDA0002591516510000112
Further, referring to FIG. 4(A), FIG. 4(A) is a graph of spherical aberration of light at 656.2725nm, 587.5618nm and 486.1327nm in the second embodiment. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the normalized field of view. As can be seen from fig. 4(a), the spherical aberration values at the wavelengths of 656.2725nm, 587.5618nm and 486.1327nm are better, which illustrates the better imaging quality of the optical lens assembly in this embodiment.
Referring to FIG. 4(B), FIG. 4(B) is a diagram of astigmatism of light beams at 656.2725nm, 587.5618nm and 486.1327nm in the second embodiment. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height. It can be seen from fig. 4(B) that the astigmatism corresponding to the three wavelengths is well compensated.
Referring to FIG. 4(C), FIG. 4(C) is a graph showing distortion at a wavelength of 486.1327nm in the second embodiment. Wherein the abscissa in the X-axis direction represents the distortion rate and the ordinate in the Y-axis direction represents the image height. It can be seen from FIG. 4(C) that the distortion at the wavelength of 486.1327nm is more than-60%, which is well corrected.
Third embodiment
In the third embodiment, as shown in fig. 5, the optical lens 100 includes, in order from an object side to an image side, a first lens element L1 with negative refractive power, a second lens element L2 with positive refractive power, a stop STO and a third lens element L3 with positive refractive power.
Specifically, the object-side surface S1 of the first lens element L1 is convex and the image-side surface S2 is concave; the object-side surface S1 of the first lens element L1 is convex at the circumference, and the image-side surface S2 is concave at the circumference; the object-side surface S3 of the second lens element L2 is convex along the optical axis, and the image-side surface S4 is concave along the optical axis; the object-side surface S3 of the second lens element L2 is convex at the circumference, and the image-side surface S4 is concave at the circumference; the object-side surface S5 of the third lens element L3 is convex along the optical axis, and the image-side surface S6 is convex along the optical axis; the object-side surface S5 of the third lens element L3 is concave at the circumference, and the image-side surface S6 is convex at the circumference.
Further, the object-side surfaces S1, S3, and S5 and the image-side surfaces S2, S4, and S6 of the first lens L1, the second lens L2, and the third lens L3 are aspheric. The first lens L1, the second lens L2 and the third lens L3 are all made of plastic. The optical lens 100 has a three-piece lens structure, which is advantageous for miniaturization, and when applied to a camera module and a terminal, is also advantageous for reducing the size of the camera module and the terminal.
Specifically, in the first embodiment, the optical lens 100 also satisfies the following relationship: FL2/FL1 ═ -1.6143; FL2/FL3 ═ 1.1989; and FL/TTL 0.2038; wherein FL1 is the focal length of first lens L1; FL2 is the focal length of second lens L2; FL3 is the focal length of third lens L3; FL is the focal length of the optical lens 100; TTL is the total length of the optical lens 100. Because of using the three-piece lens with less lens pieces, the production is easy, the assembly is convenient, when FL/TTL is 0.2038, the total length of the lens can be shorter, the thinning can be realized, and simultaneously, because of less lens pieces, the light penetration rate of the optical lens is higher, and the imaging quality is better; in addition, when each lens element of the optical lens has the above-mentioned refractive power and convex-concave design of the object side surface and the image side surface and satisfies the relationship of FL2/FL 1-1.6143 and FL2/FL 3-1.1989, the optical lens can also effectively collect light rays with large angle of view, thereby achieving the efficacy of large aperture and wide angle of view.
In addition, the parameters of the optical lens 100 are given in tables 5 and 6, and the definitions of the parameters can be obtained from the first embodiment, which is not repeated herein.
In the third embodiment, half height Y of imaging of the optical lens 100＇0.6mm, 0.325mm for the focal length FL, 2.8 for the f-number FNO, 147.9 for the maximum field of view FOV, and 1.7mm for the total length TTL of the optical lens 100.
TABLE 5
Figure BDA0002591516510000131
TABLE 6
Figure BDA0002591516510000132
Further, referring to FIG. 6(A), FIG. 6(A) is a graph of spherical aberration of light at 656.2725nm, 587.5618nm and 486.1327nm in the third embodiment. Wherein the abscissa along the X-axis direction represents the focus offset and the ordinate along the Y-axis direction represents the normalized field of view. As can be seen from fig. 6(a), the spherical aberration values at the wavelengths of 656.2725nm, 587.5618nm and 486.1327nm are better, which illustrates the better imaging quality of the optical lens assembly in this embodiment.
Referring to fig. 6(B), fig. 6(B) is a diagram of astigmatism of light beams at 656.2725nm, 587.5618nm and 486.1327nm in the third embodiment. Wherein the abscissa in the X-axis direction represents the focus shift and the ordinate in the Y-axis direction represents the image height. It can be seen from fig. 6(B) that the astigmatism corresponding to the three wavelengths is well compensated.
Referring to FIG. 6(C), FIG. 6(C) is a graph showing the distortion at 486.1327nm in the third embodiment. Wherein the abscissa in the X-axis direction represents the distortion rate and the ordinate in the Y-axis direction represents the image height. It can be seen from FIG. 2(C) that the distortion at the wavelength of 486.1327nm is more than-60%, which is well corrected.
According to a second aspect of the present application, an image capturing module 200 is provided, where the image capturing module 200 includes the above optical lens 100 and the image sensor 210, the optical lens 100 is configured to receive an optical signal of a subject and project the optical signal to the image sensor 210, and the image sensor 210 is configured to convert the optical signal corresponding to the subject into an image signal, which is not described herein again. It can be understood that the camera module 200 having the optical lens 100 has all the technical effects of the optical lens 100, that is, by reasonably configuring the refractive powers of the three optical lenses, the surface shapes and the optical parameters thereof, the camera module achieves the technical effects of easy production, low cost, convenient assembly, short total lens length, being beneficial to realizing thinness, high light transmittance, good imaging quality, large aperture, wide field angle and the like. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they are not described herein again.
According to a third aspect of the present application, a terminal 30 is provided, wherein the terminal 30 comprises the camera module 200. The terminal can be a mobile phone, a computer, a tablet, a monitor and the like. It can be understood that the terminal 30 having the camera module 200 also has all the technical effects of the optical lens 100, that is, by reasonably configuring the refractive powers of the three optical lenses, the surface shapes and the optical parameters thereof, the terminal achieves the technical effects of easy production, low cost, convenient assembly, short total lens length, being beneficial to realizing thinness, high light transmittance, good imaging quality, large aperture, wide field angle and the like. 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 technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims (11)

1. An optical lens is characterized by comprising a first lens, a second lens and a third lens which are arranged in sequence from an object side to an image side along an optical axis;
the first lens element with negative refractive power has a concave image-side surface;
the second lens element with positive refractive power has a convex object-side surface;
the third lens element with positive refractive power has a convex image-side surface;
the optical lens satisfies the following relationship:
FL2/FL1< -1.40; FL2/FL3> 1.18; and FL/TTL > 0.190;
wherein FL1 is the focal length of said first lens; FL2 is the focal length of the second lens; FL3 is the focal length of the third lens; FL is the focal length of the optical lens; TTL is the total length of the optical lens.
2. An optical lens according to claim 1, characterized in that the optical lens satisfies the following relation:
Y＇/FL>1.5；
wherein Y' is a half height of an image of the optical lens.
3. An optical lens according to claim 1, wherein the refractive index of the second lens is greater than the refractive indices of the first lens and the third lens.
4. An optical lens according to claim 3, characterized in that the optical lens satisfies the following relation:
NdL2>1.6；
wherein NdL2 is the refractive index of the second lens.
5. An optical lens according to claim 4, characterized in that the optical lens satisfies the following relation:
NdL1<1.59；
NdL3<1.59；
wherein NdL1 is the refractive index of the first lens, and NdL3 is the refractive index of the third lens.
6. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:
TTL/Y＇<3；
wherein, TTL is the total length of the optical lens.
7. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:
FOV >140 degrees;
wherein the FOV is the angle of view of the optical lens.
8. An optical lens according to claim 1, characterized in that the optical lens further comprises an optical stop, which is located between the second lens and the third lens; the optical lens satisfies the following relation:
FNO<2.8；
wherein the FNO is the f-number of the optical lens.
9. An optical lens according to claim 1, characterized in that the distortion rate of the optical lens is larger than-60%.
10. A camera module, characterized in that the camera module comprises the optical lens and the image sensor of any one of claims 1-9;
the optical lens is used for receiving a light signal of a shot object and projecting the light signal to the image sensor;
the image sensor is used for converting an optical signal of a shot object from the optical lens into an image signal.
11. A terminal characterized in that it comprises a camera module according to claim 10.
CN202010697036.5A 2020-07-20 2020-07-20 Optical lens, camera module and terminal Withdrawn CN111781703A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
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CN113093369A (en) * 2021-04-13 2021-07-09 浙江舜宇光学有限公司 Optical imaging lens
CN113238341A (en) * 2021-05-09 2021-08-10 深圳市晶钛光学股份有限公司 3 miniature super wide angle lens of piece formula and electronic equipment
CN113296236A (en) * 2021-05-12 2021-08-24 江西晶超光学有限公司 Infrared optical system, infrared receiving module and electronic equipment
CN114911030A (en) * 2021-02-09 2022-08-16 三营超精密光电(晋城)有限公司 Optical imaging system, image capturing module and electronic device
CN114942510A (en) * 2022-02-11 2022-08-26 深圳市都乐精密制造有限公司 Ultra-thin wide angle robot lens of sweeping floor
TWI810643B (en) * 2021-09-02 2023-08-01 光芒光學股份有限公司 Imaging lens

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114911030A (en) * 2021-02-09 2022-08-16 三营超精密光电(晋城)有限公司 Optical imaging system, image capturing module and electronic device
CN113093369A (en) * 2021-04-13 2021-07-09 浙江舜宇光学有限公司 Optical imaging lens
CN113093369B (en) * 2021-04-13 2022-08-26 浙江舜宇光学有限公司 Optical imaging lens
CN113238341A (en) * 2021-05-09 2021-08-10 深圳市晶钛光学股份有限公司 3 miniature super wide angle lens of piece formula and electronic equipment
CN113238341B (en) * 2021-05-09 2022-08-02 深圳市晶钛光学股份有限公司 3 miniature super wide angle lens of piece formula and electronic equipment
CN113296236A (en) * 2021-05-12 2021-08-24 江西晶超光学有限公司 Infrared optical system, infrared receiving module and electronic equipment
TWI810643B (en) * 2021-09-02 2023-08-01 光芒光學股份有限公司 Imaging lens
CN114942510A (en) * 2022-02-11 2022-08-26 深圳市都乐精密制造有限公司 Ultra-thin wide angle robot lens of sweeping floor

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