CN115327746A - Optical lens - Google Patents
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- CN115327746A CN115327746A CN202211060192.6A CN202211060192A CN115327746A CN 115327746 A CN115327746 A CN 115327746A CN 202211060192 A CN202211060192 A CN 202211060192A CN 115327746 A CN115327746 A CN 115327746A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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Abstract
The invention provides an optical lens, which comprises seven lenses in total, wherein the seven lenses are sequentially arranged from an object side to an imaging surface along an optical axis: a first lens having an optical power; a second lens having an optical power; a third lens having a positive refractive power, an object-side surface of which is convex; a fourth lens having a negative refractive power, an image-side surface of which is concave; a fifth lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a sixth lens element having a positive refractive power, wherein both the object-side surface and the image-side surface are convex; a seventh lens having a negative optical power; the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle satisfy that: IH/f is more than 0.6 and less than 0.8. The optical lens has the advantages of long focus, miniaturization, low cost, high resolution and capability of being used in weak light and severe environment.
Description
Technical Field
The invention relates to the technical field of imaging lenses, in particular to an optical lens.
Background
With the rapid development of Advanced Driving Assistance Systems (ADAS), optical lenses have been more widely applied and developed. The method comprises a vehicle data recorder, automatic parking, front vehicle collision early warning (FCW), lane departure early warning (LDW), pedestrian detection early warning (PCW) and the like.
The focal length of the lens required in the long-distance imaging is longer, but the longer focal length causes the total length of the lens to be longer, which is not beneficial to the miniaturization of the lens. Meanwhile, the lens needs a larger aperture, so that the lens has good imaging quality at night or in an environment with weak illumination conditions. Therefore, it is necessary to develop an optical lens that has a long focus, is small in size, has a low cost, has high resolution, and can be used in a low-light and severe environment.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide an optical lens having advantages of a long focal length, a small size, a low cost, a high resolution, and a capability of being used in a low light and a severe environment.
In order to realize the purpose, the technical scheme of the invention is as follows:
an optical lens comprises seven lenses, in order from an object side to an image plane along an optical axis:
a first lens having an optical power;
a second lens having an optical power;
a third lens having positive refractive power, the object-side surface of which is convex;
a fourth lens having a negative refractive power, an image-side surface of which is concave;
a fifth lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
a sixth lens element having a positive refractive power, wherein both the object-side surface and the image-side surface are convex;
a seventh lens having a negative optical power;
the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle satisfy the following conditions: IH/f is more than 0.6 and less than 0.8.
Preferably, the total optical length TTL and the effective focal length f of the optical lens satisfy: TTL/f is more than 1.6 and less than 2.0.
Preferably, the optical back focus BFL and the effective focal length f of the optical lens satisfy: BFL/f is not less than 0.15.
Preferably, the effective focal length f, the maximum field angle FOV and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.95 < (IH/2)/(f × tan (FOV/2)) < 1.15.
Preferably, the third lens has a radius of curvature of object-side surface R 5 And the radius of curvature R of the image side surface of the fourth lens 8 Satisfies the following conditions: r is more than 0.9 5 /R 8 ＜3.5。
Preferably, the fifth lens element has an object sideRadius of curvature of surface R 9 Radius of curvature R of image side surface 10 Satisfies the following conditions: r is more than 1.0 9 /R 10 ＜25.0。
Preferably, the fifth lens has a radius of curvature R at the image side surface 10 And the object side curvature radius R of the sixth lens 11 Satisfies the following conditions: r is more than 0.4 10 /R 11 ＜3.5。
Preferably, the sixth lens has a radius of curvature of object-side surface R 11 Radius of curvature R of image side surface 12 Satisfies the following conditions: -5.0 < R 11 /R 12 ＜0。
Preferably, an incident angle CRA of a chief ray of a maximum field angle of the optical lens on an image plane satisfies: CRA < 28 DEG < 8 deg.
Preferably, the total optical length TTL of the optical lens and the sum Σ CT of the central thicknesses of the first lens element to the seventh lens element along the optical axis satisfy: 0.4 <. Sigma CT/TTL < 0.7.
Compared with the prior art, the invention has the beneficial effects that: the optical lens disclosed by the application combines the lens shape and the focal power between the lenses through reasonable collocation, realizes the effects of long focus, miniaturization, low cost, high resolution and use under weak light and severe environment.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of an optical lens system according to embodiment 1 of the present invention;
fig. 2 is a schematic structural diagram of an optical lens system according to embodiment 2 of the present invention;
fig. 3 is a schematic structural diagram of an optical lens system according to embodiment 3 of the present invention;
fig. 4 is a schematic structural diagram of an optical lens system according to embodiment 4 of the present invention;
fig. 5 is a schematic structural diagram of an optical lens system according to embodiment 5 of the present invention;
fig. 6 is a schematic structural diagram of an optical lens system according to embodiment 6 of the present invention;
fig. 7 is a schematic structural diagram of an optical lens system according to embodiment 7 of the present invention;
fig. 8 is a schematic structural diagram of an optical lens system according to embodiment 8 of the present invention;
fig. 9 is a schematic structural diagram of an optical lens system according to embodiment 9 of the present invention;
fig. 10 is a schematic structural diagram of an optical lens system according to embodiment 10 of the present invention;
fig. 11 is a schematic structural diagram of an optical lens system according to embodiment 11 of the present invention;
fig. 12 is a schematic structural diagram of an optical lens system according to embodiment 12 of the present invention.
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
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 the detailed description is merely illustrative of embodiments of the application and does not limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present invention.
In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and 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, it means that 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 called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.
It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" 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. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "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 the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The optical lens according to the embodiment of the present invention includes, in order from an object side to an image side: the lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens.
In some embodiments, the third lens element may have a positive focal power, which is advantageous for converging light rays and reducing the deflection angle of the light rays, so that the light rays are smoothly transitioned. The object side surface of the third lens is a convex surface, so that the relative illumination of the optical lens is improved while light rays are converged, the brightness of the optical lens at the image surface is improved, and the dark corner is avoided.
In some embodiments, the fourth lens element may have a negative focal power, which is beneficial to increase an imaging area of the optical lens and improve the imaging quality of the optical lens. The image side surface of the fourth lens is a concave surface, so that light rays of the marginal field of view can be collected, various high-order aberrations caused by excessive divergence of the light rays are avoided, and the imaging quality of the optical lens is improved.
In some embodiments, the fifth lens element may have a negative focal power, which is beneficial to increase the imaging area of the optical lens, and thus, the too large deflection of light caused by too concentrated negative focal power of the fourth lens element is avoided, the difficulty of aberration correction of the optical lens is reduced, and the imaging quality of the optical lens is improved. The fifth lens element has a convex object-side surface and a concave image-side surface, so that more light rays can be transmitted to the rear end of the optical lens element, and the generation of various aberrations can be reduced, thereby increasing the imaging area of the optical lens element and improving the imaging quality of the optical lens element.
In some embodiments, the sixth lens element may have a positive focal power, which is beneficial for converging light rays and reducing the deflection angle of the light rays, so that the light rays are in smooth transition. The object side surface and the image side surface of the sixth lens are convex surfaces, so that the relative illumination of the optical lens is improved while light rays are converged, the brightness of the optical lens at the image surface is improved, and the dark corner is avoided.
In some embodiments, the seventh lens element may have a negative refractive power, which is beneficial to increase an imaging area of the optical lens and improve the imaging quality of the optical lens.
In some embodiments, the third lens and the fourth lens or the fifth lens and the sixth lens can be cemented to form a cemented lens, which can effectively correct chromatic aberration of the optical lens, reduce eccentricity sensitivity of the optical lens, balance aberration of the optical lens, and improve imaging quality of the optical lens; the assembly sensitivity of the optical lens can be reduced, the processing difficulty of the optical lens is further reduced, and the assembly yield of the optical lens is improved.
In some embodiments, a diaphragm for limiting the light beam may be disposed between the first lens and the second lens or between the second lens and the third lens, which can reduce the generation of optical lens ghost, and is beneficial to converging the light entering the optical system, and reducing the aperture of the rear end of the optical lens.
In some embodiments, the aperture value FNO of the optical lens satisfies: FNO is less than or equal to 1.6. The range is satisfied, the large aperture characteristic is favorably realized, and the image definition can be ensured in a low-light environment or at night.
In some embodiments, the maximum field angle FOV of the optical lens satisfies: FOV < 40 deg. The long-focus characteristic is favorably realized by meeting the range, so that the far scene information can be acquired, and the requirement of the optical lens on the detection of the far scene is met.
In some embodiments, the incident angle CRA of the maximum field angle chief ray of the optical lens on the image plane satisfies: CRA < 28 DEG < 8 deg. Satisfying the above range, the allowable error value between the CRA of the optical lens and the CRA of the chip photosensitive element can be made larger, and the adaptability of the optical lens to the image sensor can be improved.
In some embodiments, the total optical length TTL and the effective focal length f of the optical lens satisfy: TTL/f is more than 1.6 and less than 2.0. The optical lens can effectively limit the length of the lens and is beneficial to realizing the miniaturization of the optical lens.
In some embodiments, the real image height IH at which the effective focal length f of the optical lens corresponds to the maximum field angle satisfies: IH/f is more than 0.6 and less than 0.8. Satisfying the above range can make the optical lens not only give consideration to the characteristics of a large image plane, but also have good imaging quality.
In some embodiments, the optical back focus BFL and the effective focal length f of the optical lens satisfy: BFL/f is not less than 0.15. The method meets the range, is favorable for obtaining balance between good imaging quality and optical back focal length easy to assemble, and reduces the difficulty of the camera module assembly process while ensuring the imaging quality of the optical lens.
In some embodiments, the real image height IH of the optical lens corresponding to the maximum field angle and the entrance pupil diameter EPD satisfy: IH/EPD < 1.0 < 1.3. The width of the light ray bundle entering the optical lens can be increased, so that the brightness of the optical lens at the image surface is improved, and the dark corner is avoided.
In some embodiments, the effective focal length f, the maximum field angle FOV, and the true image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.95 < (IH/2)/(f × tan (FOV/2)) < 1.15. The method meets the range, is favorable for controlling the ideal image height to be close to the actual image height, realizes small distortion, reduces image quality adjustment at a module or a product end, and reduces the image quality processing burden of a host.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the first lens are different 1 Satisfies the following conditions: l f 1 The/| is less than 25.0. Satisfying the above range, the first lens can have an appropriate focal power, the working aperture of the first lens can be reduced, and the volume of the optical lens can be reduced.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the second lens 2 Satisfies the following conditions: l f 2 The/| is less than 15.0. The second lens has appropriate focal power, can correct various aberrations of the optical lens, and improves the imaging quality of the optical lens.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the third lens are 3 Satisfies the following conditions: f is more than 0 3 The/f is less than 2.0. The third lens has appropriate positive focal power, so that light can be smoothly transited, various aberrations of the optical lens are corrected, and the imaging quality of the optical lens is improved.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the fourth lens are different 4 Satisfies the following conditions: -100.0 < f 4 The/f is less than 0. The fourth lens has appropriate negative focal power, the imaging area of the optical lens is increased, various aberrations of the optical lens are corrected, and the imaging quality of the optical lens is improved.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the fifth lens 5 Satisfies the following conditions: -22.0 < f 5 /f＜0. The fifth lens has appropriate negative focal power, light can be smoothly transited, various aberrations of the optical lens are corrected, and the imaging quality of the optical lens is improved.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the sixth lens element 6 Satisfies the following conditions: f is more than 0 6 The/f is less than 1.0. Satisfy above-mentioned scope, can make the sixth lens have appropriate positive focal power, be favorable to the smooth transition of light, correct optical lens's spherical aberration and coma simultaneously, promote optical lens's imaging quality.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the seventh lens 7 Satisfies the following conditions: -1.5 < f 7 The/f is less than 0. The seventh lens has appropriate negative focal power, so that the imaging area of the optical lens can be increased, the spherical aberration, the coma aberration and the astigmatism of the optical lens can be corrected, and the imaging quality of the optical lens can be improved.
In some embodiments, the third lens has a radius of curvature of the object side R 5 And the radius of curvature R of the image side surface of the fourth lens 8 Satisfies the following conditions: r is more than 0.9 5 /R 8 Is less than 3.5. The third lens element has the advantages that the third lens element can be made to have the similar surface type with the image side surface of the fourth lens element, the field curvature of the third lens element and the field curvature of the fourth lens element can be balanced, and the imaging quality of the optical lens is improved.
In some embodiments, the fifth lens has an object side radius of curvature R 9 Radius of curvature R of image side surface 10 Satisfies the following conditions: r is more than 1.0 9 /R 10 Is less than 25.0. The optical lens has the advantages that the optical lens meets the range, the object side surface and the image side surface of the fifth lens can obtain similar surface types, the field curvature generated by the fifth lens can be reduced, and the imaging quality of the optical lens is improved.
In some embodiments, the fifth lens has a radius of curvature of image side R 10 And the object side radius of curvature R of the sixth lens 11 Satisfies the following conditions: r is more than 0.4 10 /R 11 Is less than 3.5. The image side surface of the fifth lens and the object side surface of the sixth lens can be similar in surface type, the field curvature of the fifth lens and the field curvature of the sixth lens can be balanced, and the imaging quality of the optical lens is improved.
In some embodiments, the sixth lens has a radius of curvature of the object side R 11 Radius of curvature R of image side surface 12 Satisfies the following conditions: -5.0 < R 11 /R 12 Is less than 0. Satisfy above-mentioned scope, can make sixth lens objective side and image side be similar to symmetrical structure, can balance the coma that sixth lens self produced, promote optical lens's imaging quality.
In some embodiments, the real image height IH corresponding to the maximum field angle of the optical lens and the object-side aperture D of the first lens 1 Satisfies the following conditions: d is more than 0.9 1 IH is less than 1.3. The range is satisfied, balance between a large image surface at the imaging end and a small aperture at the object side is obtained, the imaging quality of the optical lens is ensured, and the aperture at the front end is reduced.
In some embodiments, the total optical length TTL of the optical lens and the sum Σ CT of the central thicknesses of the first lens to the seventh lens along the optical axis, respectively, satisfy: 0.4 <. Sigma CT/TTL < 0.7. The optical lens structure meets the range, can effectively compress the total length of the optical lens, and is beneficial to the structural design and the production process of the optical lens.
In order to make the system have better optical performance, a plurality of aspheric lenses are adopted in the lens, and the surface shapes of the aspheric surfaces of the optical lens satisfy the following equation:
wherein z is the distance between the curved surface and the vertex of the curved surface in the optical axis direction, h is the distance between the optical axis and the curved surface, c is the curvature of the vertex of the curved surface, K is the coefficient of the quadric surface, and A, B, C, D, E, F are the coefficients of the second order, the fourth order, the sixth order, the eighth order, the tenth order and the twelfth order curved surface respectively.
The invention is further illustrated below in the following examples. In various embodiments, the thickness, the curvature radius, and the material selection of each lens in the optical lens are different, and the specific differences can be referred to in the parameter tables of the various embodiments. The following examples are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited by the following examples, and any other changes, substitutions, combinations or simplifications which do not depart from the gist of the present invention should be construed as being equivalent replacements within the scope of the present invention.
Example 1
Referring to fig. 1, a schematic structural diagram of an optical lens system according to embodiment 1 of the present invention is shown, the optical lens system sequentially includes, from an object side to an image plane along an optical axis: a first lens L1, a stop ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an optical filter G1, and a cover glass G2.
The first lens L1 has negative focal power, and both the object side surface S1 and the image side surface S2 are concave surfaces;
a diaphragm ST;
the second lens L2 has positive focal power, and both the object side surface S3 and the image side surface S4 are convex surfaces;
the third lens L3 has positive focal power, and both the object side surface S5 and the image side surface S6 are convex surfaces;
the fourth lens L4 has negative focal power, and both the object-side surface S7 and the image-side surface S8 are concave surfaces;
the fifth lens L5 has negative focal power, and the object side surface S9 is a convex surface, and the image side surface S10 is a concave surface;
the sixth lens L6 has positive focal power, and both the object-side surface S11 and the image-side surface S12 are convex surfaces;
the seventh lens element L7 has negative power, and has a concave object-side surface S13 and a convex image-side surface S14;
the third lens L3 and the fourth lens L4 can be glued to form a cemented lens;
the object side surface S15 and the image side surface S16 of the optical filter G1 are both planes;
the object side surface S17 and the image side surface S18 of the protective glass G2 are both planes;
the image formation surface S19 is a plane.
The relevant parameters of each lens in the optical lens in example 1 are shown in table 1-1.
TABLE 1-1
The parameters of the surface shape of the aspherical lens of the optical lens in example 1 are shown in table 1-2.
Tables 1 to 2
Example 2
Referring to fig. 2, a schematic structural diagram of an optical lens system according to embodiment 2 of the present invention is shown, the optical lens system sequentially includes, from an object side to an image plane along an optical axis: a first lens L1, a stop ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an optical filter G1, and a cover glass G2.
The first lens L1 has negative focal power, and the object side surface S1 and the image side surface S2 are both concave surfaces;
a diaphragm ST;
the second lens L2 has positive focal power, the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface;
the third lens L3 has positive focal power, and the object-side surface S5 is a convex surface, and the image-side surface S6 is a concave surface;
the fourth lens L4 has negative focal power, and the object-side surface S7 is a convex surface and the image-side surface S8 is a concave surface;
the fifth lens L5 has negative focal power, and the object side surface S9 is a convex surface, and the image side surface S10 is a concave surface;
the sixth lens L6 has positive focal power, and both the object-side surface S11 and the image-side surface S12 are convex surfaces;
the seventh lens element L7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14;
the third lens L3 and the fourth lens L4 may be cemented to form a cemented lens.
The relevant parameters of each lens in the optical lens in embodiment 2 are shown in table 2-1.
TABLE 2-1
The surface shape parameters of the aspherical lens of the optical lens in example 2 are shown in table 2-2.
Tables 2 to 2
Example 3
Referring to fig. 3, a schematic structural diagram of an optical lens system according to embodiment 3 of the present invention is shown, the optical lens system sequentially includes, from an object side to an image plane along an optical axis: a first lens L1, a stop ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an optical filter G1, and a cover glass G2.
The first lens L1 has negative focal power, the object side surface S1 is a convex surface, and the image side surfaces S2 are concave surfaces;
a diaphragm ST;
the second lens L2 has positive focal power, and the object-side surface S3 is a convex surface, and the image-side surface S4 is a concave surface;
the third lens L3 has positive focal power, and both the object side surface S5 and the image side surface S6 are convex surfaces;
the fourth lens L4 has negative focal power, and both the object-side surface S7 and the image-side surface S8 are concave surfaces;
the fifth lens L5 has negative focal power, and the object side surface S9 is a convex surface, and the image side surface S10 is a concave surface;
the sixth lens L6 has positive focal power, and both the object-side surface S11 and the image-side surface S12 are convex surfaces;
the seventh lens element L7 has negative power, and has a concave object-side surface S13 and a convex image-side surface S14;
the third lens L3 and the fourth lens L4 may be cemented to form a cemented lens.
The relevant parameters of each lens in the optical lens in example 3 are shown in table 3-1.
TABLE 3-1
The surface shape parameters of the aspherical lens of the optical lens in example 3 are shown in table 3-2.
TABLE 3-2
Example 4
Referring to fig. 4, a schematic structural diagram of an optical lens system according to embodiment 4 of the present invention is shown, the optical lens system sequentially includes, from an object side to an image plane along an optical axis: a first lens L1, a stop ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an optical filter G1, and a cover glass G2.
The first lens L1 has negative focal power, the object side surface S1 is a concave surface, and the image side surface S2 is a convex surface;
a diaphragm ST;
the second lens L2 has positive focal power, and both the object side surface S3 and the image side surface S4 are convex surfaces;
the third lens L3 has positive focal power, and both the object side surface S5 and the image side surface S6 are convex surfaces;
the fourth lens L4 has negative focal power, and both the object side surface S7 and the image side surface S8 are concave;
the fifth lens L5 has negative focal power, and the object side surface S9 is a convex surface, and the image side surface S10 is a concave surface;
the sixth lens L6 has positive focal power, and both the object-side surface S11 and the image-side surface S12 are convex surfaces;
the seventh lens element L7 has negative power, and has a concave object-side surface S13 and a convex image-side surface S14;
the third lens L3 and the fourth lens L4 may be cemented to form a cemented lens.
The relevant parameters of each lens in the optical lens in example 4 are shown in table 4-1.
TABLE 4-1
The parameters of the surface shape of the aspherical lens of the optical lens in example 4 are shown in table 4-2.
TABLE 4-2
Example 5
Referring to fig. 5, a schematic structural diagram of an optical lens system according to embodiment 5 of the present invention is shown, the optical lens system sequentially includes, from an object side to an image plane along an optical axis: a first lens L1, a second lens L2, a stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an optical filter G1, and a cover glass G2.
The first lens L1 has negative focal power, the object side surface S1 is a concave surface, and the image side surface S2 is a convex surface;
the second lens L2 has negative focal power, and the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface;
a diaphragm ST;
the third lens L3 has positive focal power, and both the object side surface S5 and the image side surface S6 are convex surfaces;
the fourth lens L4 has negative focal power, and the object-side surface S7 is a convex surface and the image-side surface S8 is a concave surface;
the fifth lens L5 has negative focal power, and the object side surface S9 is a convex surface, and the image side surface S10 is a concave surface;
the sixth lens L6 has positive focal power, and both the object-side surface S11 and the image-side surface S12 are convex surfaces;
the seventh lens element L7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14;
the fifth lens L5 and the sixth lens L6 may be cemented to constitute a cemented lens.
The relevant parameters of each lens in the optical lens in example 5 are shown in table 5-1.
TABLE 5-1
The surface shape parameters of the aspherical lens of the optical lens in example 5 are shown in table 5-2.
TABLE 5-2
Example 6
Referring to fig. 6, a schematic structural diagram of an optical lens system according to embodiment 6 of the present invention is shown, the optical lens system sequentially includes, from an object side to an image plane along an optical axis: a first lens L1, a second lens L2, a diaphragm ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an optical filter G1, and a cover glass G2.
The first lens L1 has negative focal power, and the object side surface S1 of the first lens L is a concave surface, and the image side surface S2 of the first lens L is a convex surface;
the second lens L2 has negative focal power, and the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface;
a diaphragm ST;
the third lens L3 has positive focal power, and both the object side surface S5 and the image side surface S6 are convex surfaces;
the fourth lens L4 has negative focal power, and the object-side surface S7 is a convex surface and the image-side surface S8 is a concave surface;
the fifth lens L5 has negative focal power, and the object side surface S9 is a convex surface, and the image side surface S10 is a concave surface;
the sixth lens L6 has positive focal power, and both the object-side surface S11 and the image-side surface S12 are convex surfaces;
the seventh lens element L7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14;
the fifth lens L5 and the sixth lens L6 may be cemented to constitute a cemented lens.
Relevant parameters of each lens in the optical lens in example 6 are shown in table 6-1.
TABLE 6-1
The parameters of the surface shape of the aspherical lens of the optical lens in example 6 are shown in table 6-2.
TABLE 6-2
Example 7
Referring to fig. 7, a schematic structural diagram of an optical lens system according to embodiment 7 of the present invention is shown, the optical lens system sequentially includes, from an object side to an image plane along an optical axis: a first lens L1, a second lens L2, a stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an optical filter G1, and a cover glass G2.
The first lens L1 has negative focal power, and the object side surface S1 and the image side surface S2 are concave surfaces;
the second lens L2 has negative focal power, the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface;
a diaphragm ST;
the third lens L3 has positive focal power, and both the object side surface S5 and the image side surface S6 are convex surfaces;
the fourth lens L4 has negative focal power, and the object-side surface S7 is a convex surface and the image-side surface S8 is a concave surface;
the fifth lens L5 has negative focal power, and the object side surface S9 is a convex surface, and the image side surface S10 is a concave surface;
the sixth lens L6 has positive focal power, and both the object-side surface S11 and the image-side surface S12 are convex surfaces;
the seventh lens element L7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14;
the fifth lens L5 and the sixth lens L6 may be cemented to constitute a cemented lens.
Relevant parameters of each lens in the optical lens in example 7 are shown in table 7-1.
TABLE 7-1
The surface shape parameters of the aspherical lens of the optical lens in example 7 are shown in table 7-2.
TABLE 7-2
Example 8
Referring to fig. 8, a schematic structural diagram of an optical lens system according to embodiment 8 of the present invention is shown, the optical lens system sequentially includes, from an object side to an image plane along an optical axis: a first lens L1, a second lens L2, a diaphragm ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an optical filter G1, and a cover glass G2.
The first lens L1 has negative focal power, and the object side surface S1 is a convex surface, and the image side surface S2 is a concave surface;
the second lens L2 has negative focal power, the object side surface S3 is a concave surface, and the image side surface S4 is a convex surface;
a diaphragm ST;
the third lens L3 has positive focal power, and both the object side surface S5 and the image side surface S6 are convex surfaces;
the fourth lens L4 has negative focal power, and the object-side surface S7 is a convex surface and the image-side surface S8 is a concave surface;
the fifth lens L5 has negative focal power, and the object side surface S9 is a convex surface, and the image side surface S10 is a concave surface;
the sixth lens L6 has positive focal power, and both the object-side surface S11 and the image-side surface S12 are convex surfaces;
the seventh lens element L7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14;
the fifth lens L5 and the sixth lens L6 may be cemented to constitute a cemented lens.
The relevant parameters of each lens in the optical lens in example 8 are shown in table 8-1.
TABLE 8-1
The surface shape parameters of the aspherical lens of the optical lens in example 8 are shown in table 8-2.
TABLE 8-2
Example 9
Referring to fig. 9, a schematic structural diagram of an optical lens system according to embodiment 9 of the present invention is shown, the optical lens system sequentially includes, from an object side to an image plane along an optical axis: a first lens L1, a second lens L2, a diaphragm ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an optical filter G1, and a cover glass G2.
The first lens L1 has positive focal power, and both the object side surface S1 and the image side surface S2 are convex surfaces;
the second lens L2 has negative focal power, and the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface;
a diaphragm ST;
the third lens L3 has positive focal power, and the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface;
the fourth lens element L4 has negative focal power, and has a convex object-side surface S7 and a concave image-side surface S8;
the fifth lens L5 has negative focal power, and the object side surface S9 is a convex surface, and the image side surface S10 is a concave surface;
the sixth lens L6 has positive focal power, and both the object-side surface S11 and the image-side surface S12 are convex surfaces;
the seventh lens element L7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14;
the third lens L3 and the fourth lens L4 may be cemented to form a cemented lens.
Relevant parameters of each lens in the optical lens in example 9 are shown in table 9-1.
TABLE 9-1
The surface shape parameters of the aspherical lens of the optical lens in example 9 are shown in table 9-2.
TABLE 9-2
Example 10
Referring to fig. 10, a schematic structural diagram of an optical lens system according to embodiment 10 of the present invention is shown, the optical lens system sequentially includes, from an object side to an image plane along an optical axis: a first lens L1, a second lens L2, a stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an optical filter G1, and a cover glass G2.
The first lens L1 has positive focal power, and both the object side surface S1 and the image side surface S2 are convex surfaces;
the second lens L2 has negative focal power, and the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface;
a diaphragm ST;
the third lens L3 has positive focal power, and the object side surface S5 is a convex surface, and the image side surface S6 is a concave surface;
the fourth lens L4 has negative focal power, and the object-side surface S7 is a convex surface and the image-side surface S8 is a concave surface;
the fifth lens L5 has negative focal power, and the object side surface S9 is a convex surface, and the image side surface S10 is a concave surface;
the sixth lens L6 has positive focal power, and both the object-side surface S11 and the image-side surface S12 are convex surfaces;
the seventh lens element L7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14;
the third lens L3 and the fourth lens L4 may be cemented to form a cemented lens.
Relevant parameters of each lens in the optical lens in example 10 are shown in table 10-1.
TABLE 10-1
The surface shape parameters of the aspherical lens of the optical lens in example 10 are shown in table 10-2.
TABLE 10-2
Example 11
Referring to fig. 11, a schematic structural diagram of an optical lens system according to embodiment 11 of the present invention is shown, the optical lens system sequentially includes, from an object side to an image plane along an optical axis: a first lens L1, a second lens L2, a stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an optical filter G1, and a cover glass G2.
The first lens L1 has positive focal power, and both the object side surface S1 and the image side surface S2 are convex surfaces;
the second lens L2 has negative focal power, and the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface;
a diaphragm ST;
the third lens L3 has positive focal power, and the object-side surface S5 is a convex surface, and the image-side surface S6 is a concave surface;
the fourth lens L4 has negative focal power, and the object-side surface S7 is a convex surface and the image-side surface S8 is a concave surface;
the fifth lens L5 has negative focal power, and the object side surface S9 is a convex surface, and the image side surface S10 is a concave surface;
the sixth lens L6 has positive focal power, and both the object-side surface S11 and the image-side surface S12 are convex surfaces;
the seventh lens element L7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14;
the third lens L3 and the fourth lens L4 may be cemented to form a cemented lens.
The relevant parameters of each lens in the optical lens in example 11 are shown in table 11-1.
TABLE 11-1
The surface shape parameters of the aspherical lens of the optical lens in example 11 are shown in table 11-2.
TABLE 11-2
Example 12
Referring to fig. 12, a schematic structural diagram of an optical lens system according to embodiment 12 of the present invention is shown, the optical lens system sequentially includes, from an object side to an image plane along an optical axis: a first lens L1, a second lens L2, a stop ST, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an optical filter G1, and a cover glass G2.
The first lens L1 has positive focal power, and both the object side surface S1 and the image side surface S2 are convex surfaces;
the second lens L2 has negative focal power, and the object side surface S3 is a convex surface, and the image side surface S4 is a concave surface;
a diaphragm ST;
the third lens L3 has positive focal power, and the object-side surface S5 is a convex surface, and the image-side surface S6 is a concave surface;
the fourth lens L4 has negative focal power, and the object-side surface S7 is a convex surface and the image-side surface S8 is a concave surface;
the fifth lens L5 has negative focal power, and the object side surface S9 is a convex surface, and the image side surface S10 is a concave surface;
the sixth lens L6 has positive focal power, and both the object-side surface S11 and the image-side surface S12 are convex surfaces;
the seventh lens element L7 has negative power, and has a convex object-side surface S13 and a concave image-side surface S14;
the third lens L3 and the fourth lens L4 may be cemented to form a cemented lens.
The relevant parameters of each lens in the optical lens in example 12 are shown in table 12-1.
TABLE 12-1
The surface shape parameters of the aspherical lens of the optical lens in example 12 are shown in table 12-2.
TABLE 12-2
Please refer to tables 13-1, 13-2, and 13-3, which show the optical characteristics of the above embodiments, including the effective focal length f, total optical length TTL, aperture FNO, real image height IH, and maximum field angle FOV of the optical lens, and the values corresponding to each conditional expression in the embodiments.
TABLE 13-1
TABLE 13-2
Tables 13-3
In summary, the optical lens according to the embodiments of the invention, by reasonably matching the lens shapes and focal power combinations among the lenses, achieves the effects of long focus, miniaturization, low cost, high resolution, and being used in low light and severe environments.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above embodiments only show several embodiments of the present invention, and the description is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the spirit of the invention, and these changes and modifications are all within the scope of the invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. An optical lens system comprising seven lens elements, in order from an object side to an image plane along an optical axis:
a first lens having an optical power;
a second lens having an optical power;
a third lens having a positive refractive power, an object-side surface of which is convex;
a fourth lens having a negative refractive power, an image-side surface of which is concave;
a fifth lens element with negative refractive power having a convex object-side surface and a concave image-side surface;
a sixth lens element having a positive refractive power, the object-side surface and the image-side surface of the sixth lens element being convex;
a seventh lens having a negative optical power;
the effective focal length f of the optical lens and the real image height IH corresponding to the maximum field angle satisfy the following conditions: IH/f is more than 0.6 and less than 0.8.
2. An optical lens according to claim 1, wherein the total optical length TTL and the effective focal length f satisfy: TTL/f is more than 1.6 and less than 2.0.
3. An optical lens according to claim 1, characterized in that the optical back focus BFL and the effective focal length f of the optical lens satisfy: BFL/f is not less than 0.15.
4. The optical lens according to claim 1, wherein the effective focal length f, the maximum field angle FOV and the real image height IH corresponding to the maximum field angle of the optical lens satisfy: 0.95 < (IH/2)/(f × tan (FOV/2)) < 1.15.
5. An optical lens barrel according to claim 1, wherein the third lens has an object side radius of curvature R 5 And the radius of curvature R of the image side surface of the fourth lens 8 Satisfies the following conditions: r is more than 0.9 5 /R 8 ＜3.5。
6. An optical lens barrel according to claim 1, wherein the fifth lens object side radius of curvature R 9 Radius of curvature R of image side surface 10 Satisfies the following conditions: r is more than 1.0 9 /R 10 ＜25.0。
7. An optical lens barrel according to claim 1, wherein the fifth lens has a radius of curvature of image side R 10 And the object side curvature radius R of the sixth lens 11 Satisfies the following conditions: r is more than 0.4 10 /R 11 ＜3.5。
8. An optical lens barrel according to claim 1, wherein the sixth lens has an object side radius of curvature R 11 Radius of curvature R of image side surface 12 Satisfies the following conditions: -5.0 < R 11 /R 12 ＜0。
9. An optical lens according to claim 1, wherein an incident angle CRA on an image plane of a maximum field angle chief ray of the optical lens satisfies: CRA < 28 DEG < 8 deg.
10. An optical lens according to claim 1, wherein a total optical length TTL of the optical lens and a sum Σ CT of central thicknesses of the first lens to the seventh lens along an optical axis, respectively, satisfy: 0.4 <. Sigma CT/TTL < 0.7.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211060192.6A CN115327746A (en) | 2022-09-01 | 2022-09-01 | Optical lens |
| PCT/CN2023/116439 WO2024046456A1 (en) | 2022-09-01 | 2023-09-01 | Optical lens |
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| CN202211060192.6A CN115327746A (en) | 2022-09-01 | 2022-09-01 | Optical lens |
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| WO (1) | WO2024046456A1 (en) |
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| WO2024046456A1 (en) * | 2022-09-01 | 2024-03-07 | 江西联创电子有限公司 | Optical lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5311200B2 (en) * | 2008-10-23 | 2013-10-09 | 株式会社ニコン | Wide-angle lens, optical device |
| JP5544834B2 (en) * | 2009-11-18 | 2014-07-09 | 株式会社ニコン | Wide angle lens and optical apparatus having the wide angle lens |
| CN112946863A (en) * | 2021-04-13 | 2021-06-11 | 浙江舜宇光学有限公司 | Optical imaging system |
| CN115097615B (en) * | 2022-08-24 | 2023-01-20 | 江西联创电子有限公司 | Optical lens |
| CN115128769B (en) * | 2022-09-01 | 2022-11-04 | 江西联创电子有限公司 | Optical lens |
| CN115327746A (en) * | 2022-09-01 | 2022-11-11 | 江西联创电子有限公司 | Optical lens |
| CN115128771B (en) * | 2022-09-01 | 2023-01-24 | 江西联创电子有限公司 | Optical lens |
| CN115128770B (en) * | 2022-09-01 | 2023-01-20 | 江西联创电子有限公司 | Optical lens |
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| WO2024046456A1 (en) * | 2022-09-01 | 2024-03-07 | 江西联创电子有限公司 | Optical lens |
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