CN117741907A - Front camera - Google Patents
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- CN117741907A CN117741907A CN202211110813.7A CN202211110813A CN117741907A CN 117741907 A CN117741907 A CN 117741907A CN 202211110813 A CN202211110813 A CN 202211110813A CN 117741907 A CN117741907 A CN 117741907A
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Abstract
The application discloses a front camera, which comprises an imaging lens group and at least one spacer, wherein the imaging lens group consists of a first lens, a second lens, a third lens and a fourth lens with negative focal power, which are sequentially arranged from an object side to an image side on an optical axis; the at least one spacer is arranged between the first lens and the fourth lens and comprises a first spacer which is arranged between the first lens and the second lens and is in contact with the image side surface of the first lens, wherein the effective focal length f1 of the first lens, the center thickness CT1 of the first lens on the optical axis, the outer diameter D1s of the object side surface of the first spacer and the inner diameter D1s of the object side surface of the first spacer are more than or equal to 5.0 and less than or equal to f1/CT1+D1s/D1s and less than or equal to 6.5.
Description
Technical Field
The application relates to the field of optical devices, in particular to a four-piece type front camera.
Background
Along with the rapid development and iteration of portable electronic products such as smart phones, the requirements on front cameras in the portable electronic products such as smart phones are more and more strict, and conventional front cameras are arranged in a bang or hole digging mode, so that the front cameras with small head sizes become industry development trends in order to achieve smaller screen occupation ratios.
In order to meet the requirement of small head size, the front camera adopts a small head design mode in terms of optics and structural design, namely the optical caliber of a first lens of the front camera needs to be as small as possible, so that the front camera can still have smaller head size after the mechanism parts of the lens and the lens barrel are added. However, the optical aperture of the first lens is not necessarily too small due to limitations of f-number and illuminance, and the mechanism parts of the lens and barrel still require a certain size space due to limitations of the molding size workability of the lens mechanism and barrel mechanism, and therefore it is difficult to simultaneously make the front camera have a small head size and good imaging quality due to limitations of optical parameters such as the f-number, illuminance, and the like and workability.
Disclosure of Invention
The present application provides a front-facing camera that solves at least one problem, or others, in the prior art.
An aspect of the present application provides a front camera including an imaging lens group and at least one spacer, the imaging lens group being composed of a first lens, a second lens, a third lens, and a fourth lens having negative optical power, which are sequentially arranged from an object side to an image side on an optical axis; the at least one spacer is arranged between the first lens and the fourth lens and comprises a first spacer which is arranged between the first lens and the second lens and is contacted with the image side surface of the first lens; the effective focal length f1 of the first lens, the center thickness CT1 of the first lens on the optical axis, the outer diameter D1s of the object side surface of the first spacer and the inner diameter D1s of the object side surface of the first spacer are all 5.0-6.5 inclusive.
According to an exemplary embodiment of the present application, the front camera further comprises a lens barrel for accommodating the imaging lens group and the at least one spacer, wherein an effective focal length f1 of the first lens, an object side end surface of the lens barrel, and a spacing EP01 of the first spacer along the optical axis satisfy 1.5< f 1/(EP 01+ct 1) <2.5 with a center thickness CT1 of the first lens on the optical axis.
According to an exemplary embodiment of the present application, the front camera further comprises a lens barrel for accommodating the imaging lens group and the at least one spacer, wherein an outer diameter D0s of an object side end surface of the lens barrel, an inner diameter D0s of the object side end surface of the lens barrel and a radius of curvature R1 of the object side surface of the first lens satisfy 1.0< (d0s+d0s)/R1 <2.5.
According to an exemplary embodiment of the present application, the radius of curvature R1 of the object-side surface of the first lens, the outer diameter D1m of the image-side surface of the first spacer, and the inner diameter D1m of the image-side surface of the first spacer satisfy 1.0< R1/(D1 m-D1 m) <3.5.
According to an exemplary embodiment of the present application, the at least one spacer further comprises a second spacer located between the second lens and the third lens and in contact with the image side surface of the second lens, wherein the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the outer diameter D1m of the image side surface of the first spacer and the outer diameter D2m of the image side surface of the second spacer satisfy 2.0< f1/d1m+|f2/d2m| <4.5.
According to an exemplary embodiment of the present application, the outer diameter D2s of the object-side surface of the second spacer, the inner diameter D2s of the object-side surface of the second spacer and the radius of curvature R4 of the image-side surface of the second lens satisfy 1.0< (d2s+d2s)/R4 <2.5.
According to an exemplary embodiment of the present application, the radius of curvature R4 of the image side surface of the second lens, the interval EP12 of the first spacer and the second spacer along the optical axis and the center thickness CT2 of the second lens on the optical axis satisfy 7.0< |r4/(EP 12-CT 2) | <13.5.
According to an exemplary embodiment of the present application, the effective focal length f2 of the second lens and the inner diameter d2m of the image side of the second spacer satisfy-3.5 < f2/d2m < -1.0.
According to an exemplary embodiment of the present application, the at least one spacer further comprises a second spacer and a third spacer, the second spacer is located between the second lens and the third lens and is in contact with the image side of the second lens, the third spacer is located between the third lens and the fourth lens and is in contact with the image side of the third lens, wherein an outer diameter D3s of the object side of the third spacer, an inner diameter D3s of the object side of the third spacer, a radius of curvature R6 of the image side of the third lens and a radius of curvature R7 of the object side of the fourth lens satisfy 9.0< (d3s+d3s)/(r6+r7) <17.5.
According to an exemplary embodiment of the present application, the effective focal length f3 of the third lens, the interval EP23 of the second spacer and the third spacer along the optical axis, and the air interval T34 of the third lens and the fourth lens on the optical axis satisfy 2.0< f 3/(EP 23+t34) <4.0.
According to an exemplary embodiment of the present application, the inner diameter d2m of the image side surface of the second spacer, the inner diameter d3m of the image side surface of the third spacer, and the radius of curvature R6 of the image side surface of the third lens satisfy 1.5< | (d 3m-d2 m)/R6| <3.5.
According to an exemplary embodiment of the present application, the effective focal length f4 of the fourth lens and the maximum thickness CP3 of the third spacer satisfy-6.0 < f4/CP3< -2.0.
According to an exemplary embodiment of the present application, the front camera further comprises a lens barrel for accommodating the imaging lens group and the at least one spacer, wherein a combined focal length f12 of the first lens and the second lens and a length L of the lens barrel in a direction of the optical axis satisfy 2.0< f12/L <4.0.
According to an exemplary embodiment of the present application, the effective focal length f1 of the first lens, the center thickness CT1 of the first lens on the optical axis, and the length L of the lens barrel in the direction of the optical axis satisfy 7.5< (f1+l)/CT 1<9.0.
The front-end camera is difficult to simultaneously have small head size and good imaging quality under the limitation of optical parameters such as f-number, illumination and the like and the machinability, the front-end camera is configured into the structural form of the four-piece lens, and through controlling the effective focal length of the first lens, the central thickness of the first lens on the optical axis and the interrelationship between the outer diameter and the inner diameter of the object side surface of the first spacer, the structural miniaturization and the irreconcilability of the image quality of the front-end camera can be balanced, the aberration of the front-end camera is further balanced on the basis that the front-end camera achieves miniaturization and large head depth (namely, small head size), the resolving power of the front-end camera is improved, stray light generated inside the first lens is shielded through the first spacer, the stray light risk is reduced, the interference to the image quality of the front-end camera is improved, and the imaging quality of the front-end camera is improved.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, made with reference to the following drawings, in which:
fig. 1 shows a schematic structural view of a front camera according to the present application;
FIG. 2 shows a schematic view of the optical path of light within a front camera according to the present application;
fig. 3 shows a schematic structural diagram of a front camera according to example 1 of the first embodiment of the present application;
fig. 4 shows a schematic structural diagram of a front camera according to example 2 of the first embodiment of the present application;
fig. 5A to 5D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the front camera according to the first embodiment of the present application;
fig. 6 shows a schematic structural diagram of a front camera according to example 1 of a second embodiment of the present application;
fig. 7 shows a schematic structural diagram of a front camera according to example 2 of a second embodiment of the present application;
fig. 8A to 8D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the front camera according to the second embodiment of the present application;
fig. 9 shows a schematic structural diagram of a front camera according to example 1 of a third embodiment of the present application;
fig. 10 shows a schematic structural diagram of a front camera according to example 2 of the third embodiment of the present application;
fig. 11A to 11D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the front camera according to the third embodiment of the present application;
fig. 12 shows a schematic structural diagram of a front camera according to example 1 of a fourth embodiment of the present application;
fig. 13 shows a schematic structural diagram of a front camera according to example 2 of a fourth embodiment of the present application; and
fig. 14A to 14D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the front camera according to the fourth embodiment of the present application.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed description are merely illustrative of exemplary embodiments of the application and are not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification.
It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. Specifically, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when describing embodiments of the present application, use of "may" means "one or more embodiments of the present application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The features, principles, and other aspects of the present application are described in detail below.
The front camera according to the exemplary embodiment of the present application may include an imaging lens group composed of four lenses having optical power, the four lenses being a first lens, a second lens, a third lens, and a fourth lens, respectively, and the four lenses being sequentially arranged from an object side to an image side along an optical axis. In the first lens to the fourth lens, an air space may be provided between any adjacent two lenses. The front camera is configured to be in a structural form with four lenses, so that the product cost can be greatly reduced, the simplicity of processing and assembling the front camera is improved, and the yield and the production efficiency of the front camera are further improved.
In an exemplary embodiment, the first lens has positive optical power, the second lens has negative optical power, the third lens has positive optical power, and the fourth lens has negative optical power. Through dispose leading camera as first lens and third lens be positive focal power, second lens and fourth lens be the optical system of negative focal power, can effectively balance the structure miniaturization and the irreconcilability of image quality of leading camera for leading camera has good imaging quality under the circumstances that guaranteeing leading camera has little head size.
In an exemplary embodiment, at least one spacer is disposed between the first lens and the fourth lens. By using the spacer, the stray light risk can be effectively avoided, the interference to the image quality is reduced, and the imaging quality of the front camera is improved.
In an exemplary embodiment, the front camera may include a lens barrel for accommodating the imaging lens group and the at least one spacer, and the lens barrel may have an object side end surface and an image side end surface.
In an exemplary embodiment, the at least one spacer may include a first spacer located between the first lens and the second lens and in contact with an image side surface of the first lens. By enabling the first spacer to be abutted against the image side surface of the first lens, the entry of stray light can be reduced to the greatest extent on the premise of not losing illuminance, the stray light risk is avoided, the interference on image quality is reduced, and the imaging quality of the front camera is improved.
In an exemplary embodiment, the at least one spacer may include a second spacer and a third spacer, the second spacer being positioned between and in contact with the image side of the second lens and the third lens, the third spacer being positioned between and in contact with the image side of the third lens. Through setting up the spacer respectively at the image side of second lens and the image side of third lens, can effectively shelter from the non-effective footpath light of lens, prevent the light leak and other miscellaneous light's production to improve the imaging quality of leading camera.
In an exemplary embodiment, the effective focal length f1 of the first lens, the center thickness CT1 of the first lens on the optical axis, the outer diameter D1s of the object side surface of the first spacer, and the inner diameter D1s of the object side surface of the first spacer satisfy 5.0.ltoreq.f1/CT1+D1s/d1s.ltoreq.6.5. By controlling the effective focal length of the first lens, the central thickness of the first lens on the optical axis and the correlations between the outer diameter and the inner diameter of the object side surface of the first spacer, on one hand, the effective focal length and the central thickness of the first lens can be reasonably limited, on the basis of miniaturization of the front-end camera, the aberration of the front-end camera is balanced, and the front-end camera has good resolution while the front-end camera is ensured to have a larger head depth (namely, a small head size); on the other hand, the inner diameter and the outer diameter of the object side surface of the first spacer can be reasonably limited, so that stray light generated inside the first lens (shown in fig. 2) can be effectively shielded, and the imaging quality of the front camera can be improved.
In an exemplary embodiment, the effective focal length f1 of the first lens, the object-side end surface of the lens barrel, and the interval EP01 of the first spacer along the optical axis satisfy 1.5< f 1/(EP 01+ct1) <2.5 with the center thickness CT1 of the first lens on the optical axis. Through controlling the effective focal length of the first lens, the distance between the object side end surface of the lens barrel and the first spacer along the optical axis and the central thickness of the first lens on the optical axis, the front end size of the front camera is miniaturized, the processing manufacturability of the front camera is improved, the problems that the actual debugging of the lens is difficult, the lens deforms in the assembling process and the like are avoided, and the field curvature stability of the front camera is ensured.
In an exemplary embodiment, an outer diameter D0s of the object-side end surface of the lens barrel, an inner diameter D0s of the object-side end surface of the lens barrel, and a radius of curvature R1 of the object-side surface of the first lens satisfy 1.0< (d0s+d0s)/R1 <2.5. By controlling the interrelation between the outer diameter and the inner diameter of the object side end surface of the lens barrel and the curvature radius of the object side surface of the first lens, on one hand, the size of the object side end surface of the lens barrel and the curvature radius of the object side surface of the first lens can be reasonably distributed, so that the front camera has smaller head size, and the aperture miniaturization of a mobile phone screen can be realized; on the other hand, the front camera can have enough light flux under the condition of smaller front end (object side) opening, and the image surface is ensured to have enough brightness, so that the front camera has good imaging quality.
In an exemplary embodiment, the radius of curvature R1 of the object-side surface of the first lens, the outer diameter D1m of the image-side surface of the first spacer, and the inner diameter D1m of the image-side surface of the first spacer satisfy 1.0< R1/(D1 m-D1 m) <3.5. By controlling the interrelationship between the outer diameter and the inner diameter of the image side surface of the first spacer and the curvature radius of the object side surface of the first lens, on one hand, the vignetting value of the front camera can be effectively controlled, so that the first spacer intercepts light rays with poor imaging quality, and the front camera can better converge the light rays, and the resolution of the front camera is improved; on the other hand, the first spacer can also effectively block stray light reflected by the edge of the first lens for many times, so that the stray light is prevented from striking an image surface to influence the image quality.
In an exemplary embodiment, the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the outer diameter D1m of the image side of the first spacer and the outer diameter D2m of the image side of the second spacer satisfy 2.0< f1/d1m+|f2/d2m| <4.5. Through controlling the effective focal length of the first lens, the effective focal length of the second lens, the interrelationship between the outer diameter of the image side surface of the first spacer and the outer diameter of the image side surface of the second spacer, the focal power of the first lens and the focal power of the second lens can be reasonably distributed, the spherical aberration of the front camera can be effectively balanced, the sensitivity of the front two lenses is reduced, the front camera can better converge light rays, the image quality of the front camera is improved, meanwhile, the problem that the surface type forming difficulty is high in the actual machining process due to overlarge inclination angle is avoided, in addition, the outer diameters of the image side surfaces of the first spacer and the second spacer can be limited, so that stray light is further blocked, and the stray light risk is avoided.
In an exemplary embodiment, the outer diameter D2s of the object-side surface of the second spacer, the inner diameter D2s of the object-side surface of the second spacer, and the radius of curvature R4 of the image-side surface of the second lens satisfy 1.0< (d2s+d2s)/R4 <2.5. By controlling the interrelationship between the inner diameter and the outer diameter of the object side surface of the second spacer and the curvature radius of the image side surface of the second lens, on one hand, the processing opening angle of the second lens can be kept within a reasonable processing range, so that the surface shape of the second lens is smoother, and the chromatic aberration and the image field bending of the front camera are balanced better; on the other hand, the inner diameter and the outer diameter of the side face of the second spacer can be limited, so that light rays are converged, stray light can be blocked, and total reflection and ghost images on the surface of the lens are avoided.
In an exemplary embodiment, the radius of curvature R4 of the image side of the second lens, the spacing EP12 of the first and second spacers along the optical axis, and the center thickness CT2 of the second lens on the optical axis satisfy 7.0< |R4/(EP 12-CT 2) | <13.5. By controlling the correlations among the curvature radius of the image side surface of the second lens, the intervals of the first spacer and the second spacer along the optical axis and the central thickness of the second lens on the optical axis, on one hand, the deflection angles of light rays on the second lens and the third lens can be effectively reduced, and then the ghost image energy between the second lens and the third lens is reduced; on the other hand, the optical distortion of the front-facing camera can be reduced, and the field curvature of the front-facing camera is balanced, so that the imaging quality of the front-facing camera is improved.
In an exemplary embodiment, the effective focal length f2 of the second lens and the inner diameter d2m of the image side of the second spacer satisfy-3.5 < f2/d2m < -1.0. By controlling the correlation between the effective focal length of the second lens and the inner diameter of the image side surface of the second spacer, the focal power of the system can be reasonably distributed, so that the front camera has good aberration correction capability while keeping miniaturization; the excessive rise of the second lens can be avoided, and the processing manufacturability of the front camera is further improved; the deflection angle of light rays in the second lens can be reduced, and the sensitivity of the second lens is reduced, so that the front camera has good light collecting capability and good resolution at the same time; the inner diameter of the image side surface of the second spacer can be limited, so that the second spacer can block light rays with larger deflection, and the problem of light leakage of the front camera is avoided.
In an exemplary embodiment, the outer diameter D3s of the object-side surface of the third spacer, the inner diameter D3s of the object-side surface of the third spacer, the radius of curvature R6 of the image-side surface of the third lens, and the radius of curvature R7 of the object-side surface of the fourth lens satisfy 9.0< (d3s+d3s)/(r6+r7) <17.5. By controlling the inner diameter and the outer diameter of the object side surface of the third spacer and the correlation between the curvature radius of the image side surface of the third lens and the curvature radius of the object side surface of the fourth lens, on one hand, the astigmatism and the coma between the fourth lens and the first several lenses can be effectively balanced, so that the front camera has good imaging quality; on the other hand, the sensitivity of the front camera can be reduced, and a series of processing problems caused by too poor processing manufacturability of the fourth lens can be avoided.
In an exemplary embodiment, the effective focal length f3 of the third lens, the intervals EP23 of the second and third spacers along the optical axis, and the air interval T34 of the third and fourth lenses on the optical axis satisfy 2.0< f 3/(EP 23+t34) <4.0. Through controlling the effective focal length of the third lens, the interval between the second spacer and the third spacer along the optical axis and the air interval between the third lens and the fourth lens on the optical axis, the overall length of the front-end camera is favorably controlled, miniaturization and portability of the front-end camera are ensured, meanwhile, the problems of distortion and astigmatism of the front-end camera can be balanced better, the front-end camera has good imaging quality, the processing manufacturability of the front-end camera is improved, and the yield of the front-end camera is improved.
In an exemplary embodiment, the inner diameter d2m of the image side surface of the second spacer, the inner diameter d3m of the image side surface of the third spacer, and the radius of curvature R6 of the image side surface of the third lens satisfy 1.5< | (d 3m-d2 m)/r6| <3.5. By controlling the interrelationship between the inner diameter of the image side surface of the second spacer, the inner diameter of the image side surface of the third spacer and the curvature radius of the image side surface of the third lens, stray light reflected by the edges of the third lens and the fourth lens for many times can be blocked, light rays with poor imaging quality are intercepted, light rays are converged, and therefore the resolution of the front camera is improved.
In an exemplary embodiment, the effective focal length f4 of the fourth lens and the maximum thickness CP3 of the third spacer satisfy-6.0 < f4/CP3< -2.0. By controlling the correlation between the effective focal length of the fourth lens and the maximum thickness of the third spacer, on one hand, the maximum thickness of the third spacer can be reasonably limited, so that the third lens and the fourth lens can still be supported sufficiently at the position with large break, and the assembly stability is improved; on the other hand, the focal power of the fourth lens can be reasonably controlled to control light convergence, so that light emitted by the front-facing camera is better matched with the receiver.
In an exemplary embodiment, the combined focal length f12 of the first lens and the second lens and the length L of the lens barrel in the direction of the optical axis satisfy 2.0< f12/L <4.0. Through the correlation between the length of the combined focal length of the first lens and the second lens and the direction of the lens barrel along the optical axis, the front-end camera is beneficial to achieving miniaturization, so that the front-end camera has short total length and small appearance when imaging clearly, the practicability of the front-end camera is ensured, in addition, the front-end camera is beneficial to acquiring a larger image surface, and the imaging quality is higher.
In an exemplary embodiment, the effective focal length f1 of the first lens, the center thickness CT1 of the first lens on the optical axis, and the length L of the lens barrel in the direction of the optical axis satisfy 7.5< (f1+l)/CT 1<9.0. Through controlling the effective focal length of the first lens, the central thickness of the first lens on the optical axis and the length of the lens barrel along the direction of the optical axis, the first lens of the front camera can be set to be a thicker lens, the effect of rapid convergence of light rays at the first lens is realized, and the requirements of small head size and miniaturization of the front camera are met.
The front camera according to the above embodiments of the present application may employ a plurality of lenses, for example, the four lenses above. Through reasonable distribution of focal power, surface type, center thickness, air interval and the like of each lens and each spacer, the front camera can realize the requirements of small head and miniaturization, reduce sensitivity of the front camera and improve resolution, imaging quality and processing manufacturability of the front camera. The head diameter of the front camera may be, for example, 1.5mm to 2.28mm.
In an embodiment of the present application, at least one of the mirrors of each of the first to fourth lenses is an aspherical mirror. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring during imaging can be eliminated as much as possible, thereby improving imaging quality.
However, it will be appreciated by those skilled in the art that the number of lenses and spacers that make up the front camera may be varied to achieve the various results and advantages described in this specification without departing from the technical solutions claimed herein. For example, although four lenses and three spacers are described as examples in the embodiment, the front camera is not limited to include four lenses and three spacers. The front camera may also include other numbers of lenses or spacers, if desired.
Specific examples of the front camera that can be applied to the above-described embodiments are further described below with reference to the accompanying drawings.
First embodiment
A front camera according to a first embodiment of the present application is described below with reference to fig. 3 to 5D. Fig. 3 shows a schematic structural diagram of front camera 110 according to example 1 of the first embodiment of the present application; fig. 4 shows a schematic structural diagram of the front camera 120 according to example 2 of the first embodiment of the present application.
As shown in fig. 3 to 4, the front cameras 110 and 120 each include a lens barrel P0, an imaging lens group, and a plurality of spacers, the imaging lens group including, in order from an object side to an image side: a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4. The stop STO may be disposed between the object side and the first lens E1 according to actual needs. The plurality of spacers includes: a first spacer P1, a second spacer P2, and a third spacer P3. The spacers P1-P3 can block the superfluous light from entering the front camera, so that the lens and the lens barrel are better supported, and the structural stability of the front camera is enhanced.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is convex and an image-side surface S8 thereof is concave. The filter E5 has an object side surface S9 and an image side surface S10. Light from the object sequentially passes through the respective surfaces S1 to S10 in accordance with the optical path M shown in fig. 2 and is finally imaged on the imaging surface S11.
Table 1 shows a basic parameter table of the front camera of the first embodiment, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 1
In the first embodiment, the object side surface and the image side surface of any one of the first lens E1 to the fourth lens E4 are aspherical, and the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:
wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is a conic coefficient; ai is the correction coefficient of the aspherical i-th order. Tables 2-1 and 2-2 show the higher order coefficients A that can be used for each of the aspherical mirror surfaces S1-S8 in the first embodiment 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 And A 30 。
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -5.8627E-03 | 7.9554E-04 | 1.3948E-03 | 1.1691E-03 | 8.4400E-04 | 4.0546E-04 | 4.8248E-05 |
| S2 | -4.3712E-02 | 2.0543E-03 | 1.3147E-04 | 1.7471E-04 | 3.1767E-05 | 4.8284E-05 | 2.0914E-05 |
| S3 | -1.5349E-01 | 1.3603E-02 | -1.1328E-03 | 1.0081E-03 | -4.6595E-04 | 1.8667E-04 | -1.0014E-04 |
| S4 | -1.8465E-01 | 2.7219E-02 | -6.6506E-03 | 2.8287E-03 | -9.9452E-04 | 4.3391E-04 | -2.0685E-04 |
| S5 | -5.5272E-02 | 2.5964E-02 | -5.8094E-03 | 4.6606E-03 | -8.6041E-04 | 1.6845E-04 | -2.0507E-04 |
| S6 | 2.7183E-01 | 1.2735E-02 | 2.1395E-02 | 4.2993E-03 | -1.7724E-04 | -4.2080E-04 | -1.3357E-03 |
| S7 | -4.6364E-01 | 8.0295E-02 | 3.5242E-02 | -3.0998E-02 | 7.1802E-04 | -7.6696E-03 | -1.9238E-03 |
| S8 | -1.0196E+00 | 6.6566E-02 | -2.4399E-02 | 8.4849E-03 | 2.4194E-03 | 4.0378E-03 | 2.3607E-03 |
TABLE 2-1
| Face number | A18 | A20 | A22 | A24 | A26 | A28 | A30 |
| S1 | -2.1458E-04 | -3.3062E-04 | -3.3666E-04 | -2.6056E-04 | -1.5768E-04 | -6.5131E-05 | -1.5699E-05 |
| S2 | 5.0299E-06 | -6.2896E-06 | -1.0254E-05 | -4.8438E-06 | -1.0314E-06 | 6.9307E-07 | 1.8070E-07 |
| S3 | 4.3951E-05 | -2.4263E-05 | 1.5620E-05 | -3.6480E-06 | 6.1001E-06 | -2.9274E-06 | 3.6476E-07 |
| S4 | 7.3142E-05 | -3.4333E-05 | 1.1310E-05 | -6.0229E-06 | 4.5047E-06 | -1.1990E-07 | -3.3958E-07 |
| S5 | 1.5162E-05 | 2.4800E-06 | 9.2648E-06 | -5.0165E-06 | 3.4295E-06 | -1.4294E-06 | 2.1398E-07 |
| S6 | -4.5263E-05 | -2.5751E-04 | 1.5100E-04 | -6.9045E-05 | 1.5890E-05 | -2.7632E-05 | 2.1918E-05 |
| S7 | -3.6262E-03 | -3.1180E-05 | -6.9527E-04 | -5.4600E-04 | -3.1051E-04 | 3.6207E-04 | 2.4228E-04 |
| S8 | -7.8578E-04 | -1.2361E-03 | -1.0362E-03 | -3.5499E-04 | -3.4962E-04 | -8.4750E-05 | -8.0017E-05 |
TABLE 2-2
The front cameras 110 and 120 in examples 1 and 2 of the first embodiment are different in the structural size of the spacers included. Tables 3-1 to 3-2 show some basic parameters of the spacers and the lens barrels of the front cameras 110 and 120 of the first embodiment, some of the basic parameters listed in tables 3-1 to 3-2 are measured according to the labeling method shown in fig. 1, and the basic parameters listed in tables 3-1 to 3-2 are all in millimeters (mm).
| ExamplesParameter/parameter | D0s | d0s | D1s | d1s | D1m | d1m | D2m | D2s | d2s |
| 1-1 | 1.800 | 1.536 | 1.964 | 1.288 | 1.964 | 1.288 | 3.000 | 3.000 | 1.780 |
| 1-2 | 1.800 | 1.531 | 2.900 | 1.312 | 2.900 | 1.312 | 3.000 | 3.000 | 1.747 |
TABLE 3-1
| Examples/parameters | d2m | D3s | d3s | D3m | EP01 | EP12 | EP23 | CP3 | L |
| 1-1 | 1.780 | 2.763 | 2.416 | 4.440 | 0.975 | 0.398 | 0.355 | 0.550 | 3.150 |
| 1-2 | 1.747 | 2.763 | 2.416 | 4.440 | 1.011 | 0.344 | 0.374 | 0.550 | 3.150 |
TABLE 3-2
Fig. 5A shows on-axis chromatic aberration curves of the front cameras 110 and 120 of the first embodiment, which represent the deviation of the converging focal points of light rays of different wavelengths after passing through the front cameras 110 and 120. Fig. 5B shows astigmatism curves of the front cameras 110 and 120 of the first embodiment, which represent meridional image surface curvature and sagittal image surface curvature corresponding to different image heights. Fig. 5C shows distortion curves of the front cameras 110 and 120 of the first embodiment, which represent distortion magnitude values corresponding to different image heights. Fig. 5D shows magnification chromatic aberration curves of the front cameras 110 and 120 of the first embodiment, which represent deviations of different image heights on the imaging plane after light passes through the front cameras 110 and 120. As can be seen from fig. 5A to 5D, the front cameras 110 and 120 according to the first embodiment can achieve good imaging quality.
Second embodiment
A front camera according to a second embodiment of the present application is described below with reference to fig. 6 to 8D. Fig. 6 shows a schematic structural diagram of a front camera 210 according to example 1 of the second embodiment of the present application; fig. 7 shows a schematic structural diagram of a front camera 220 according to example 2 of the second embodiment of the present application.
As shown in fig. 6 to 7, the front cameras 210 and 220 each include a lens barrel P0, an imaging lens group, and a plurality of spacers, the imaging lens group including, in order from an object side to an image side: a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4. The stop STO may be disposed between the object side and the first lens E1 according to actual needs. The plurality of spacers includes: a first spacer P1, a second spacer P2, and a third spacer P3. The spacers P1-P3 can block the superfluous light from entering the front camera, so that the lens and the lens barrel are better supported, and the structural stability of the front camera is enhanced.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is convex, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is convex and an image-side surface S8 thereof is concave. The filter E5 has an object side surface S9 and an image side surface S10. Light from the object sequentially passes through the respective surfaces S1 to S10 in accordance with the optical path M shown in fig. 2 and is finally imaged on the imaging surface S11.
Table 4 shows a basic parameter table of the front camera of the second embodiment, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 4 Table 4
In the second embodiment, the object side surface and the image side surface of any one of the first to fourth lenses E1 to E4 are aspherical surfaces. Tables 5-1 and 5-2 show the higher order coefficients A that can be used for each of the aspherical mirror surfaces S1-S8 in the second embodiment 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 And A 30 。
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -6.1866E-03 | 8.3797E-04 | 1.2377E-03 | 1.1684E-03 | 8.3325E-04 | 4.4992E-04 | 6.0590E-05 |
| S2 | -4.5524E-02 | 1.3204E-03 | 1.1421E-04 | 1.7915E-04 | 1.1765E-05 | 3.1552E-05 | 1.0756E-05 |
| S3 | -1.5734E-01 | 9.7964E-03 | -4.4507E-04 | 8.7045E-04 | -2.8224E-04 | 1.0401E-04 | -3.5219E-05 |
| S4 | -1.8645E-01 | 2.4826E-02 | -6.8383E-03 | 2.8247E-03 | -9.5233E-04 | 3.7951E-04 | -1.7296E-04 |
| S5 | -4.5403E-02 | 2.2700E-02 | -7.9297E-03 | 4.6856E-03 | -7.5098E-04 | 1.0105E-04 | -1.6089E-04 |
| S6 | 2.6725E-01 | 6.0479E-03 | 1.8909E-02 | 3.2321E-03 | 4.2927E-04 | -1.6460E-04 | -1.1527E-03 |
| S7 | -4.3185E-01 | 6.4703E-02 | 1.9130E-02 | -4.6005E-02 | 5.2887E-03 | 1.1930E-03 | 1.0233E-03 |
| S8 | -9.6764E-01 | 1.0694E-01 | -1.3046E-02 | 1.2747E-03 | -1.0184E-02 | 5.3266E-04 | 3.2158E-03 |
TABLE 5-1
| Face number | A18 | A20 | A22 | A24 | A26 | A28 | A30 |
| S1 | -2.0856E-04 | -3.5035E-04 | -3.5752E-04 | -2.8458E-04 | -1.7143E-04 | -7.1491E-05 | -1.2153E-05 |
| S2 | 4.4370E-07 | -4.3000E-06 | -6.8252E-06 | 4.6500E-08 | -2.8814E-06 | 8.1530E-07 | 1.6601E-07 |
| S3 | 1.8079E-05 | -4.1496E-06 | 7.9435E-06 | -5.9734E-06 | 7.2539E-07 | -2.0136E-06 | 1.6189E-06 |
| S4 | 6.9380E-05 | -2.9029E-05 | 2.3172E-05 | -1.3635E-05 | 6.4551E-06 | -6.5078E-06 | 2.6211E-06 |
| S5 | 1.3473E-05 | -1.5802E-05 | 3.2864E-05 | -1.6644E-05 | 9.4860E-06 | -6.7234E-06 | 1.3241E-06 |
| S6 | -7.0787E-05 | -2.8673E-04 | 1.8852E-04 | -3.0842E-05 | 4.7059E-05 | -2.7350E-05 | 3.0345E-06 |
| S7 | -5.8212E-03 | -1.9959E-03 | -1.8377E-03 | -1.3082E-04 | 6.0355E-05 | 8.8479E-04 | 1.9256E-04 |
| S8 | 3.6084E-03 | 2.7491E-03 | 2.1145E-03 | 8.0287E-04 | -3.6359E-04 | -2.3635E-04 | -2.6020E-04 |
TABLE 5-2
The front cameras 210 and 220 in examples 1 and 2 of the second embodiment are different in the structural size of the spacers included. Tables 6-1 to 6-2 show some basic parameters of the spacers and the lens barrels of the front cameras 210 and 220 of the second embodiment, some of the basic parameters listed in tables 6-1 to 6-2 are measured according to the labeling method shown in fig. 1, and the basic parameters listed in tables 6-1 to 6-2 are all in millimeters (mm).
| Examples/parameters | D0s | d0s | D1s | d1s | D1m | d1m | D2m | D2s | d2s |
| 2-1 | 1.500 | 1.284 | 1.964 | 1.318 | 1.964 | 1.318 | 2.700 | 2.700 | 1.869 |
| 2-2 | 1.500 | 1.284 | 2.600 | 1.318 | 2.600 | 1.318 | 2.700 | 2.700 | 1.803 |
TABLE 6-1
| Examples/parameters | d2m | D3s | d3s | D3m | EP01 | EP12 | EP23 | CP3 | L |
| 2-1 | 1.869 | 2.585 | 2.351 | 4.180 | 0.895 | 0.422 | 0.301 | 0.559 | 3.050 |
| 2-2 | 1.803 | 2.585 | 2.351 | 3.901 | 0.600 | 0.382 | 0.341 | 0.504 | 3.050 |
TABLE 6-2
Fig. 8A shows on-axis chromatic aberration curves of the front cameras 210 and 220 of the second embodiment, which represent the deviation of the converging focal points of light rays of different wavelengths after passing through the front cameras 210 and 220. Fig. 8B shows astigmatism curves of the front cameras 210 and 220 of the second embodiment, which represent meridional image surface curvature and sagittal image surface curvature corresponding to different image heights. Fig. 8C shows distortion curves of the front cameras 210 and 220 of the second embodiment, which represent distortion magnitude values corresponding to different image heights. Fig. 8D shows magnification chromatic aberration curves of the front cameras 210 and 220 of the second embodiment, which represent deviations of different image heights on the imaging plane after light passes through the front cameras 210 and 220. As can be seen from fig. 8A to 8D, the front cameras 210 and 220 according to the second embodiment can achieve good imaging quality.
Third embodiment
A front camera according to a third embodiment of the present application is described below with reference to fig. 9 to 11D. Fig. 9 shows a schematic structural diagram of a front camera 310 according to example 1 of the third embodiment of the present application; fig. 10 shows a schematic structural diagram of a front camera 320 according to example 2 of the third embodiment of the present application.
As shown in fig. 9 to 10, the front cameras 310 and 320 each include a lens barrel P0, an imaging lens group, and a plurality of spacers, the imaging lens group including, in order from an object side to an image side: a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4. The stop STO may be disposed between the object side and the first lens E1 according to actual needs. The plurality of spacers includes: a first spacer P1, a second spacer P2, and a third spacer P3. The spacers P1-P3 can block the superfluous light from entering the front camera, so that the lens and the lens barrel are better supported, and the structural stability of the front camera is enhanced.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is convex. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is convex, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is convex and an image-side surface S8 thereof is concave. The filter E5 has an object side surface S9 and an image side surface S10. Light from the object sequentially passes through the respective surfaces S1 to S10 in accordance with the optical path M shown in fig. 2 and is finally imaged on the imaging surface S11.
Table 7 shows a basic parameter table of the front camera of the third embodiment, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
TABLE 7
In the third embodiment, the object side surface and the image side surface of any one of the first to fourth lenses E1 to E4 are aspherical surfaces. Tables 8-1 and 8-2 show the higher order coefficients A that can be used for each of the aspherical mirror surfaces S1-S8 in the third embodiment 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 And A 30 。
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -7.2272E-03 | 1.8802E-06 | 6.6801E-04 | 8.9247E-04 | 7.7571E-04 | 5.1166E-04 | 1.2783E-04 |
| S2 | -4.3851E-02 | 1.2849E-03 | 1.6947E-04 | 1.4448E-04 | 4.6457E-05 | 9.6690E-06 | 1.7060E-05 |
| S3 | -1.5404E-01 | 1.2357E-02 | -1.0602E-03 | 7.1584E-04 | -2.0706E-04 | 9.0484E-05 | -2.5960E-05 |
| S4 | -1.8317E-01 | 2.7053E-02 | -7.4741E-03 | 2.5517E-03 | -8.3291E-04 | 3.5526E-04 | -1.5644E-04 |
| S5 | -1.0180E-01 | 2.4106E-02 | -7.0697E-03 | 4.2417E-03 | -6.6902E-04 | 1.8843E-04 | -2.1366E-04 |
| S6 | 2.5868E-01 | 2.7253E-03 | 1.9533E-02 | 4.5299E-03 | 3.4179E-04 | -1.8782E-04 | -1.3544E-03 |
| S7 | -4.9039E-01 | 9.4039E-02 | 6.0099E-03 | -4.6505E-02 | 3.0696E-03 | 6.3848E-04 | 8.7003E-05 |
| S8 | -9.5255E-01 | 1.1887E-01 | -9.0768E-03 | 2.0117E-03 | -9.6072E-03 | -8.2572E-04 | 2.8774E-03 |
TABLE 8-1
| Face number | A18 | A20 | A22 | A24 | A26 | A28 | A30 |
| S1 | -1.9163E-04 | -3.8984E-04 | -4.2026E-04 | -3.3570E-04 | -1.9524E-04 | -7.5630E-05 | -1.0804E-05 |
| S2 | -9.1161E-06 | -1.6021E-06 | -8.6153E-06 | 2.8120E-06 | -3.4238E-06 | 1.6314E-06 | -2.1647E-07 |
| S3 | 1.0101E-05 | 1.3938E-07 | 5.4642E-06 | -1.7897E-06 | -6.2740E-07 | -1.6003E-06 | 1.0208E-06 |
| S4 | 5.7259E-05 | -2.8716E-05 | 1.6133E-05 | -5.9840E-06 | 4.4987E-06 | -2.6490E-06 | 5.2308E-07 |
| S5 | 1.9270E-05 | -2.0354E-05 | 2.6571E-05 | -7.6623E-06 | 4.2684E-06 | -2.0954E-06 | 7.0623E-08 |
| S6 | -1.0096E-04 | -3.1520E-04 | 1.9568E-04 | -1.5763E-05 | 5.9749E-05 | -2.4436E-05 | 3.4778E-06 |
| S7 | -5.9901E-03 | -1.7391E-03 | -1.5863E-03 | -1.8591E-04 | 2.2444E-04 | 9.1214E-04 | 3.8031E-04 |
| S8 | 2.1766E-03 | 2.3525E-03 | 1.7069E-03 | 1.2691E-03 | 3.2032E-05 | -4.3599E-05 | -1.7379E-04 |
TABLE 8-2
The front cameras 310 and 320 in examples 1 and 2 of the third embodiment are different in the structural size of the spacers included. Tables 9-1 to 9-2 show some basic parameters of the spacers and the lens barrels of the front cameras 310 and 320 of the third embodiment, some of the basic parameters listed in tables 9-1 to 9-2 are measured according to the labeling method shown in fig. 1, and the basic parameters listed in tables 9-1 to 9-2 are all in millimeters (mm).
| Examples/parameters | D0s | d0s | D1s | d1s | D1m | d1m | D2m | D2s | d2s |
| 3-1 | 1.700 | 1.513 | 2.037 | 1.337 | 2.037 | 1.337 | 3.000 | 2.906 | 1.810 |
| 3-2 | 1.700 | 1.513 | 2.800 | 1.347 | 2.800 | 1.347 | 3.131 | 2.990 | 1.868 |
TABLE 9-1
| Examples/parameters | d2m | D3s | d3s | D3m | EP01 | EP12 | EP23 | CP3 | L |
| 3-1 | 2.234 | 2.711 | 2.454 | 4.214 | 0.998 | 0.337 | 0.287 | 0.509 | 3.150 |
| 3-2 | 2.234 | 4.112 | 2.776 | 4.130 | 1.018 | 0.294 | 0.500 | 0.305 | 3.150 |
TABLE 9-2
Fig. 11A shows on-axis chromatic aberration curves of front cameras 310 and 320 of the third embodiment, which represent the deviation of converging focal points of light rays of different wavelengths after passing through the front cameras 310 and 320. Fig. 11B shows astigmatism curves of the front cameras 310 and 320 of the third embodiment, which represent meridional image surface curvature and sagittal image surface curvature corresponding to different image heights. Fig. 11C shows distortion curves of the front cameras 310 and 320 of the third embodiment, which represent distortion magnitude values corresponding to different image heights. Fig. 11D shows a magnification chromatic aberration curve of the front cameras 310 and 320 of the third embodiment, which represents the deviation of different image heights on the imaging plane after light passes through the front cameras 310 and 320. As can be seen from fig. 11A to 11D, the front cameras 310 and 320 according to the third embodiment can achieve good imaging quality.
Fourth embodiment
A front camera according to a fourth embodiment of the present application is described below with reference to fig. 12 to 14D. Fig. 12 shows a schematic structural diagram of a front camera 410 according to example 1 of a fourth embodiment of the present application; fig. 13 shows a schematic structural diagram of a front camera 420 according to example 2 of the fourth embodiment of the present application.
As shown in fig. 12 to 13, the front cameras 410 and 420 each include a lens barrel P0, an imaging lens group, and a plurality of spacers, the imaging lens group including, in order from an object side to an image side: a first lens E1, a second lens E2, a third lens E3, and a fourth lens E4. The stop STO may be disposed between the object side and the first lens E1 according to actual needs. The plurality of spacers includes: a first spacer P1, a second spacer P2, and a third spacer P3. The spacers P1-P3 can block the superfluous light from entering the front camera, so that the lens and the lens barrel are better supported, and the structural stability of the front camera is enhanced.
The first lens element E1 has positive refractive power, wherein an object-side surface S1 thereof is convex, and an image-side surface S2 thereof is concave. The second lens element E2 has negative refractive power, wherein an object-side surface S3 thereof is concave, and an image-side surface S4 thereof is concave. The third lens element E3 has positive refractive power, wherein an object-side surface S5 thereof is concave, and an image-side surface S6 thereof is convex. The fourth lens element E4 has negative refractive power, wherein an object-side surface S7 thereof is convex and an image-side surface S8 thereof is concave. The filter E5 has an object side surface S9 and an image side surface S10. Light from the object sequentially passes through the respective surfaces S1 to S10 in accordance with the optical path M shown in fig. 2 and is finally imaged on the imaging surface S11.
Table 10 shows a basic parameter table of the front camera of the fourth embodiment, in which the units of radius of curvature, thickness/distance, and focal length are all millimeters (mm).
Table 10
In the fourth embodiment, the object side surface and the image side surface of any one of the first to fourth lenses E1 to E4 are aspherical surfaces. Tables 11-1 and 11-2 show the heights of the respective aspherical mirror faces S1 to S8 that can be used in the fourth embodimentCoefficient of minor term A 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 、A 18 、A 20 、A 22 、A 24 、A 26 、A 28 And A 30 。
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | -4.9237E-03 | 1.0322E-03 | 1.2303E-03 | 1.1650E-03 | 8.1134E-04 | 4.4764E-04 | 6.5913E-05 |
| S2 | -4.4009E-02 | 5.7248E-04 | 5.6130E-04 | 3.4724E-04 | -1.7880E-05 | -4.7086E-05 | -9.0174E-05 |
| S3 | -1.5363E-01 | 5.5787E-03 | 2.7681E-03 | 1.4304E-03 | 1.8870E-04 | 1.0242E-04 | 4.9402E-05 |
| S4 | -1.8557E-01 | 2.1823E-02 | -2.4129E-03 | 3.2592E-03 | -7.1540E-05 | 3.8993E-04 | -1.3440E-05 |
| S5 | -7.7273E-03 | 2.4750E-02 | -9.1713E-03 | 4.1470E-03 | -3.8017E-04 | 2.1958E-04 | 9.0923E-05 |
| S6 | 2.7364E-01 | 9.2918E-04 | 1.2093E-02 | 2.7703E-04 | -2.7579E-04 | 7.9242E-04 | -6.5135E-04 |
| S7 | -3.1416E-01 | 3.8268E-02 | 1.9919E-02 | -3.6322E-02 | 8.4249E-04 | 1.2862E-03 | 2.0869E-03 |
| S8 | -7.9179E-01 | 8.7637E-02 | -4.2984E-03 | 5.0527E-03 | -7.9052E-03 | -8.4146E-04 | -1.5991E-03 |
TABLE 11-1
| Face number | A18 | A20 | A22 | A24 | A26 | A28 | A30 |
| S1 | -1.8325E-04 | -3.1754E-04 | -3.2053E-04 | -2.5594E-04 | -1.5196E-04 | -6.2494E-05 | -8.1474E-06 |
| S2 | -6.7844E-05 | -5.2466E-05 | -2.2749E-05 | -5.6865E-06 | 1.4992E-06 | 4.6180E-06 | 3.2415E-06 |
| S3 | -1.9307E-05 | 7.2724E-07 | -2.1189E-05 | -8.7017E-06 | -7.7465E-06 | 8.9875E-07 | 1.5256E-06 |
| S4 | -1.0371E-04 | -8.9889E-05 | -1.1180E-04 | -6.6243E-05 | -4.9099E-05 | -1.7105E-05 | -5.8307E-06 |
| S5 | 1.3395E-05 | 3.9404E-06 | 1.4704E-05 | -6.5209E-06 | 7.9760E-06 | -3.5349E-06 | 4.3952E-07 |
| S6 | 2.9786E-04 | -3.2435E-04 | 1.4397E-04 | -1.1259E-04 | 4.1477E-05 | -3.3491E-05 | 1.7948E-05 |
| S7 | -6.9447E-04 | -4.8799E-04 | -1.2422E-03 | -1.0356E-03 | -7.8279E-04 | -4.7658E-05 | -4.2275E-05 |
| S8 | 4.4130E-04 | -1.9671E-04 | 9.8352E-04 | 6.1420E-04 | 3.9940E-04 | 1.4562E-04 | 2.2889E-05 |
TABLE 11-2
The front cameras 410 and 420 in examples 1 and 2 of the fourth embodiment are different in the structural size of the spacers included. Tables 12-1 to 12-2 show some basic parameters of the spacers and the lens barrels of the front cameras 410 and 420 of the fourth embodiment, some of the basic parameters listed in tables 12-1 to 12-2 are measured according to the labeling method shown in fig. 1, and the basic parameters listed in tables 12-1 to 12-2 are all in millimeters (mm).
| Examples/parameters | D0s | d0s | D1s | d1s | D1m | d1m | D2m | D2s | d2s |
| 4-1 | 2.283 | 1.710 | 1.900 | 1.250 | 1.900 | 1.250 | 2.700 | 2.700 | 1.779 |
| 4-2 | 2.283 | 1.910 | 1.900 | 1.267 | 1.900 | 1.267 | 2.419 | 2.366 | 1.751 |
TABLE 12-1
| Examples/parameters | d2m | D3s | d3s | D3m | EP01 | EP12 | EP23 | CP3 | L |
| 4-1 | 1.779 | 2.588 | 2.248 | 4.265 | 0.987 | 0.440 | 0.297 | 0.660 | 3.200 |
| 4-2 | 1.930 | 2.644 | 2.388 | 4.165 | 1.017 | 0.349 | 0.309 | 0.556 | 3.200 |
TABLE 12-2
Fig. 14A shows on-axis chromatic aberration curves of front cameras 410 and 420 of the fourth embodiment, which represent the deviation of converging focal points of light rays of different wavelengths after passing through the front cameras 410 and 420. Fig. 14B shows astigmatism curves of the front cameras 410 and 420 of the fourth embodiment, which represent meridional image surface curvature and sagittal image surface curvature corresponding to different image heights. Fig. 14C shows distortion curves of front cameras 410 and 420 of the fourth embodiment, which represent distortion magnitude values corresponding to different image heights. Fig. 14D shows magnification chromatic aberration curves of the front cameras 410 and 420 of the fourth embodiment, which represent deviations of different image heights on the imaging plane after light passes through the front cameras 410 and 420. As can be seen from fig. 14A to 14D, the front cameras 410 and 420 according to the fourth embodiment can achieve good imaging quality.
In summary, the conditional expressions of the examples in the first to fourth embodiments satisfy the relationship shown in table 13.
| Condition/example | 1-1 | 1-2 | 2-1 | 2-2 | 3-1 | 3-2 | 4-1 | 4-2 |
| f1/CT1+D1s/d1s | 5.49 | 6.17 | 5.72 | 6.20 | 5.47 | 6.02 | 6.22 | 6.20 |
| f1/(EP01+CT1) | 1.79 | 1.75 | 1.99 | 2.41 | 1.76 | 1.74 | 2.07 | 2.04 |
| (D0s+d0s)/R1 | 1.48 | 1.47 | 1.23 | 1.23 | 1.39 | 1.39 | 2.04 | 2.14 |
| R1/(D1m-d1m) | 3.34 | 1.42 | 3.49 | 1.76 | 3.31 | 1.59 | 3.02 | 3.09 |
| f1/D1m+|f2/D2m| | 2.88 | 2.36 | 3.25 | 2.83 | 2.64 | 2.17 | 3.89 | 4.13 |
| (D2s+d2s)/R4 | 1.68 | 1.67 | 1.89 | 1.87 | 2.13 | 2.19 | 1.18 | 1.09 |
| |R4/(EP12-CT2)| | 15.95 | 22.95 | 11.93 | 14.93 | 18.94 | 30.1 | 17.23 | 29.38 |
| f2/d2m | -2.13 | -2.17 | -2.23 | -2.31 | -1.45 | -1.45 | -3.03 | -2.79 |
| (D3s+d3s)/(R6+R7) | 12.89 | 12.89 | 11.38 | 11.38 | 12.88 | 17.17 | 9.30 | 9.67 |
| f3/(EP23+T34) | 2.99 | 2.85 | 3.45 | 3.09 | 3.53 | 2.16 | 3.40 | 3.29 |
| |(d3m-d2m)/R6| | 3.02 | 3.07 | 2.85 | 2.71 | 2.18 | 1.84 | 3.17 | 2.90 |
| f12/L | 2.78 | 2.78 | 2.88 | 2.88 | 3.95 | 3.95 | 2.37 | 2.37 |
| f4/CP3 | -3.10 | -3.10 | -3.06 | -3.39 | -3.38 | -5.65 | -2.46 | -2.92 |
| (f1+L)/CT1 | 7.90 | 7.90 | 8.06 | 8.06 | 7.87 | 7.87 | 8.82 | 8.82 |
| (CT1+CT3)/EP12 | 3.81 | 4.42 | 3.66 | 4.05 | 4.64 | 5.32 | 3.50 | 4.41 |
TABLE 13
The present application also provides an imaging device, the electron-sensitive element of which may be a photosensitive coupling element (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device may be a stand alone imaging device such as a digital camera or an imaging module integrated on a mobile electronic device such as a cell phone. The imaging device is equipped with the front camera described above.
The foregoing description is only of the preferred embodiments of the present application and is presented as a description of the principles of the technology being utilized. It will be appreciated by persons skilled in the art that the scope of the invention referred to in this application is not limited to the specific combinations of features described above, but also covers other technical solutions which may be formed by any combination of the features described above or their equivalents without departing from the inventive concept. Such as the above-described features and technical features having similar functions (but not limited to) disclosed in the present application are replaced with each other.
Claims (10)
1. Front-mounted camera, its characterized in that includes:
an imaging lens group composed of a first lens, a second lens, a third lens, and a fourth lens having negative optical power, which are sequentially arranged from an object side to an image side on an optical axis; and
at least one spacer disposed between the first lens and the fourth lens, and including a first spacer disposed between the first lens and the second lens and contacting an image side surface of the first lens;
the effective focal length f1 of the first lens, the center thickness CT1 of the first lens on the optical axis, the outer diameter D1s of the object side surface of the first spacer and the inner diameter D1s of the object side surface of the first spacer are all 5.0-6.5 inclusive.
2. The front camera according to claim 1, further comprising a barrel for accommodating the imaging lens group and the at least one spacer,
wherein an effective focal length f1 of the first lens, an object-side end surface of the lens barrel, and an interval EP01 of the first spacer along the optical axis satisfy 1.5< f 1/(EP 01+ct 1) <2.5 with a center thickness CT1 of the first lens on the optical axis.
3. The front camera according to claim 1, further comprising a barrel for accommodating the imaging lens group and the at least one spacer,
wherein, the outer diameter D0s of the object side end surface of the lens barrel, the inner diameter D0s of the object side end surface of the lens barrel and the curvature radius R1 of the object side surface of the first lens satisfy 1.0< (D0s+d0s)/R1 <2.5.
4. The front camera according to claim 1, wherein a radius of curvature R1 of the object side surface of the first lens, an outer diameter D1m of the image side surface of the first spacer, and an inner diameter D1m of the image side surface of the first spacer satisfy 1.0< R1/(D1 m-D1 m) <3.5.
5. The front camera of claim 1, wherein the at least one spacer further comprises a second spacer positioned between the second lens and the third lens and in contact with an image side surface of the second lens,
wherein an effective focal length f1 of the first lens, an effective focal length f2 of the second lens, an outer diameter D1m of an image side surface of the first spacer, and an outer diameter D2m of an image side surface of the second spacer satisfy 2.0< f1/d1m+|f2/d2m| <4.5.
6. The front camera according to claim 5, wherein a radius of curvature R4 of an image side surface of the second lens, a spacing EP12 of the first spacer and the second spacer along the optical axis, and a center thickness CT2 of the second lens on the optical axis satisfy 7.0< |r4/(EP 12-CT 2) | <13.5.
7. The front camera according to claim 5, wherein an effective focal length f2 of the second lens and an inner diameter d2m of an image side surface of the second spacer satisfy-3.5 < f2/d2m < -1.0.
8. The front camera of claim 1, wherein the at least one spacer further comprises a second spacer and a third spacer, the second spacer being located between and in contact with the image side of the second lens, the third spacer being located between and in contact with the image side of the third lens,
wherein an outer diameter D3s of the object side surface of the third spacer, an inner diameter D3s of the object side surface of the third spacer, a radius of curvature R6 of the image side surface of the third lens, and a radius of curvature R7 of the object side surface of the fourth lens satisfy 9.0< (d3s+d3s)/(r6+r7) <17.5.
9. The front camera according to claim 8, wherein an effective focal length f3 of the third lens, a spacing EP23 of the second spacer and the third spacer along the optical axis, and an air spacing T34 of the third lens and the fourth lens on the optical axis satisfy 2.0< f 3/(EP 23+t34) <4.0.
10. The front camera according to claim 8, wherein an effective focal length f4 of the fourth lens and a maximum thickness CP3 of the third spacer satisfy-6.0 < f4/CP3< -2.0.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211110813.7A CN117741907A (en) | 2022-09-13 | 2022-09-13 | Front camera |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211110813.7A CN117741907A (en) | 2022-09-13 | 2022-09-13 | Front camera |
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| CN117741907A true CN117741907A (en) | 2024-03-22 |
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| CN202211110813.7A Pending CN117741907A (en) | 2022-09-13 | 2022-09-13 | Front camera |
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| CN (1) | CN117741907A (en) |
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