CN111897099A - Fixed focus lens - Google Patents
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- CN111897099A CN111897099A CN202010921262.7A CN202010921262A CN111897099A CN 111897099 A CN111897099 A CN 111897099A CN 202010921262 A CN202010921262 A CN 202010921262A CN 111897099 A CN111897099 A CN 111897099A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The embodiment of the invention discloses a fixed-focus lens. The fixed-focus lens comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power or negative focal power, a diaphragm, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power and a seventh lens with positive focal power, which are sequentially arranged from an object side to an image side along an optical axis; the first lens and the third lens are all spherical lenses, and the second lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all aspheric lenses. The technical scheme of the embodiment of the invention can realize the 4K wide-angle optical lens with large target surface and ultra-large aperture, the lens supports 1/1.8 inch of the maximum target surface under the condition of lower cost, the F-number is more than 0.8 and less than 1.2, the field angle is more than 120 degrees, and the lens can meet the imaging requirement when used in the environment of-30-80 ℃.
Description
Technical Field
The embodiment of the invention relates to a lens technology, in particular to a fixed-focus lens.
Background
With the rapid development of science and technology, people also have higher-level knowledge on security, and the monitoring lens emerges immediately. In recent years, a monitoring lens has become a major force in the security industry, and the security industry is pushed to advance and develop rapidly.
With the increasing development of security monitoring systems, the requirements on security lenses are higher and higher, and the requirements are mainly embodied in higher image quality, larger view field, larger light aperture and larger target surface. At present, the field angle of an existing super-large aperture lens is usually small and is generally smaller than 120 degrees, the target surface is generally 1/2.7 inches, but in the field of security monitoring, a larger field angle means a wider monitoring range, and a larger target surface means better detailed embodiment. Therefore, it is necessary to develop a large-target-surface and ultra-large-aperture 4K wide-angle optical lens for the existing situation of small field angle and small target surface.
Disclosure of Invention
The embodiment of the invention provides a fixed-focus lens to realize a 4K wide-angle optical lens with a large target surface and an ultra-large aperture, wherein the lens supports 1/1.8 inch of the maximum target surface under the condition of low cost, the F number is more than 0.8 and less than F <1.2, the field angle is more than 120 degrees, and the lens meets the imaging requirement when used in an environment of-30-80 ℃.
The embodiment of the invention provides a fixed-focus lens, which comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power or negative focal power, a diaphragm, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power and a seventh lens with positive focal power, wherein the first lens with negative focal power, the second lens with negative focal power, the third lens with positive focal power or negative focal power, the diaphragm, the fourth lens with positive focal power, the fifth lens with positive focal power, the sixth lens with negative focal power and the seventh lens;
wherein the first lens and the third lens are all spherical lenses, and the second lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all aspheric lenses.
Optionally, the first lens and the third lens are both glass spherical lenses, and the second lens, the fifth lens, the sixth lens and the seventh lens are all plastic aspheric lenses.
Optionally, the fourth lens is a glass aspheric lens or a plastic aspheric lens.
Optionally, the first lens satisfies:
1.5<|f1/f|<4.0；
where f1 denotes a focal length of the first lens, and f denotes a focal length of the prime lens.
Optionally, the second lens satisfies:
2.0<|f2/f|<5.0；
1.0<|ET2/CT2|<2.0；
where f2 denotes a focal length of the second lens, f denotes a focal length of the prime lens, ET2 denotes a thickness of an edge of the second lens in an axial direction or a thickest position in the axial direction, and CT2 denotes a center thickness of the second lens.
Optionally, the third lens satisfies:
|f3/f|>5.0；
where f3 denotes a focal length of the third lens, and f denotes a focal length of the prime lens.
Optionally, the fourth lens satisfies:
1.5<|f4/f|<4.0；
where f4 denotes a focal length of the fourth lens, and f denotes a focal length of the prime lens.
Optionally, the fifth lens to the seventh lens satisfy:
1.5<|f5/f|<4.0；
1.1<|f6/f|<3.0；
1.5<|f7/f|<4.0；
40<vd5<70；
20<vd6<40；
40<vd7<70；
wherein f5, f6, and f7 denote focal lengths of the fifth lens, the sixth lens, and the seventh lens, respectively, f denotes a focal length of the fixed-focus lens, and vd5, vd6, and vd7 denote abbe numbers of the fifth lens, the sixth lens, and the seventh lens, respectively.
Optionally, an object-side surface of the first lens element is a convex surface, and an image-side surface of the first lens element is a concave surface; the object side surface of the second lens is a concave surface, and the image side surface of the first lens is a concave surface or a convex surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface; the object side surface of the seventh lens element is a convex surface, and the image side surface of the seventh lens element is a convex surface.
Optionally, the fixed-focus lens satisfies the following conditions:
5.0<TTL/f<10.0；
wherein TTL represents the optical total length of the fixed-focus lens, and f represents the focal length of the fixed-focus lens.
The fixed focus lens provided by the embodiment of the invention comprises a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power or negative focal power, a diaphragm, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power and a seventh lens with positive focal power, which are sequentially arranged from an object space to an image space along an optical axis; the first lens and the third lens are all spherical lenses, and the second lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all aspheric lenses. The first lens and the second lens with negative focal power have the function of collecting light rays for the large-field optical system, and the second lens can correct the on-axis aberration while collecting the light rays; the third lens with positive focal power or negative focal power is used for correcting the off-axis aberration; the fourth lens with positive focal power is beneficial to correcting spherical aberration and coma aberration, is beneficial to controlling the volume of the lens and meets the requirement of a large aperture; the combination of the fifth lens to the seventh lens is beneficial to the correction of the chromatic aberration of the system; the large-light-transmission fixed-focus lens suitable for monitoring requirements under complex conditions is realized by matching the spherical lens and the aspheric lens, can reach a large aperture with the F number of 0.8< F <1.2, supports a target surface of 1/1.8 inch, has a field angle range of more than 120 degrees, and meets imaging requirements when used in an environment of-30-80 ℃.
Drawings
Fig. 1 is a schematic structural diagram of a fixed focus lens according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating an axial aberration curve of a fixed focus lens according to an embodiment of the present invention;
fig. 3 is a field curvature diagram of a fixed focus lens according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a distortion curve of a fixed-focus lens according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another fixed-focus lens provided in the embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating an axial aberration curve of another fixed-focus lens according to an embodiment of the present invention;
FIG. 7 is a field curvature diagram of another fixed focus lens according to an embodiment of the present invention;
FIG. 8 is a diagram illustrating a distortion curve of another fixed-focus lens according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of another fixed-focus lens provided in the embodiment of the present invention;
FIG. 10 is a schematic diagram illustrating an axial aberration curve of a fixed-focus lens according to another embodiment of the present invention;
FIG. 11 is a field curvature diagram of a fixed focus lens according to another embodiment of the present invention;
fig. 12 is a schematic diagram of a distortion curve of another fixed-focus lens according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. It should be noted that the terms "upper", "lower", "left", "right", and the like used in the description of the embodiments of the present invention are used in the angle shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in this context, it is also to be understood that when an element is referred to as being "on" or "under" another element, it can be directly formed on "or" under "the other element or be indirectly formed on" or "under" the other element through an intermediate element. The terms "first," "second," and the like, are used for descriptive purposes only and not for purposes of limitation, and do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Fig. 1 is a schematic structural diagram of a fixed focus lens according to an embodiment of the present invention. Referring to fig. 1, the fixed focus lens provided by the embodiment of the present invention includes a first lens 10 with negative power, a second lens 20 with negative power, a third lens 30 with positive power or negative power, a diaphragm 80, a fourth lens 40 with positive power, a fifth lens 50 with positive power, a sixth lens 60 with negative power, and a seventh lens 70 with positive power, which are arranged in this order from the object side to the image side along the optical axis; the first lens 10 and the third lens 30 are all spherical lenses, and the second lens 20, the fourth lens 40, the fifth lens 50, the sixth lens 60, and the seventh lens 70 are all aspheric lenses.
Therein, it is understood that the optical power is equal to the difference between the image-side and object-side convergence, which characterizes the ability of the optical system to deflect light. The larger the absolute value of the focal power is, the stronger the bending ability to the light ray is, and the smaller the absolute value of the focal power is, the weaker the bending ability to the light ray is. When the focal power is positive, the refraction of the light is convergent; when the focal power is negative, the refraction of the light is divergent. The optical power can be suitable for representing a certain refractive surface of a lens (namely, a surface of the lens), can be suitable for representing a certain lens, and can also be suitable for representing a system (namely a lens group) formed by a plurality of lenses together. In this embodiment, each lens can be fixed in a lens barrel (not shown in fig. 1), and by reasonably distributing the focal power and shape of the lens, for example, the first lens 10 and the second lens 20 with negative focal power are arranged to facilitate light reception, and the third lens 30 with increased field angle, positive focal power or negative focal power corrects off-axis aberration, the aperture 80 can adjust the size of the field of view, block off-axis light, avoid that the off-axis light affects the imaging quality, improve the image quality, and make the lens have a large light transmission amount. Optionally, the total optical length TTL of the fixed focus lens provided in this embodiment satisfies 5.0< TTL/F <10.0, where F represents a focal length of the fixed focus lens, the aperture F may reach 0.8 to 1.2, and supports an image plane of 1/1.8 inch, and the FOV range of the field of view is greater than 120 °.
According to the technical scheme of the embodiment, the first lens and the second lens with negative focal power are arranged, so that the effect of collecting light rays for the large-field optical system is achieved, and the on-axis aberration can be corrected while the second lens collects the light rays; the third lens with positive focal power or negative focal power is used for correcting the off-axis aberration; the fourth lens with positive focal power is beneficial to correcting spherical aberration and coma aberration, is beneficial to controlling the volume of the lens and meets the requirement of a large aperture; the combination of the fifth lens to the seventh lens is beneficial to the correction of the chromatic aberration of the system; the large-light-transmission fixed-focus lens suitable for monitoring requirements under complex conditions is realized by matching the spherical lens and the aspheric lens, can reach a large aperture with the F number of 0.8< F <1.2, supports a target surface of 1/1.8 inch, has a field angle range of more than 120 degrees, and meets imaging requirements when used in an environment of-30-80 ℃.
On the basis of the above technical solution, optionally, the first lens 10 and the third lens 30 are both glass spherical lenses, and the second lens 20, the fifth lens 50, the sixth lens 60, and the seventh lens 70 are all plastic aspheric lenses. Optionally, the fourth lens 40 is a glass aspheric lens or a plastic aspheric lens.
By arranging the first lens 10 as a glass spherical lens, the glass spherical lens is easy to process, has good physical and chemical properties and has stronger adaptability to the environment; the third lens 30 is a glass lens, and can be designed to have positive focal power or negative focal power as required for correcting off-axis aberration; the fourth lens 40 is designed as a glass aspheric lens or a plastic aspheric lens, and the position is favorable for correcting spherical aberration and coma aberration; and the other lenses are plastic aspheric lenses, so that the good aberration correction capability can be ensured under the condition of low cost.
Optionally, the first lens 10 satisfies:
1.5<|f1/f|<4.0；
where f1 denotes the focal length of the first lens 10, and f denotes the focal length of the prime lens.
Optionally, the second lens 20 satisfies:
2.0<|f2/f|<5.0；
1.0<|ET2/CT2|<2.0；
where f2 denotes a focal length of the second lens 20, f denotes a focal length of the fixed focus lens, ET2 denotes a thickness of an edge of the second lens 20 in the axial direction or a thickest position in the axial direction, and CT2 denotes a center thickness of the second lens 20.
Optionally, the third lens 30 satisfies:
|f3/f|>5.0；
where f3 denotes the focal length of the third lens 30, and f denotes the focal length of the prime lens.
Optionally, the fourth lens 40 satisfies:
1.5<|f4/f|<4.0；
where f4 denotes the focal length of the fourth lens 40, and f denotes the focal length of the prime lens.
Alternatively, the fifth lens 50 to the seventh lens 70 satisfy:
1.5<|f5/f|<4.0；
1.1<|f6/f|<3.0；
1.5<|f7/f|<4.0；
40<vd5<70；
20<vd6<40；
40<vd7<70；
where f5, f6, and f7 denote focal lengths of the fifth lens 50, the sixth lens 60, and the seventh lens 70, respectively, f denotes a focal length of the fixed-focus lens, and vd5, vd6, and vd7 denote abbe numbers of the fifth lens 50, the sixth lens 60, and the seventh lens 70, respectively.
The second lens 20 is designed to meet the requirement of 1.0< | ET2/CT2| <2.0, so that the second lens 20 can have better manufacturability; the focal length range of the fourth lens 40 is designed, so that the volume of the lens can be controlled, and the requirement of a large aperture can be met; the abbe number ranges of the fifth lens 50, the sixth lens 60 and the seventh lens 70 are matched, so that the chromatic aberration of the lens can be corrected; by comprehensively setting the optical parameters of the first lens 10 to the seventh lens 70, the requirements that the aperture F can reach 0.8-1.2, a 1/1.8 inch image surface is supported and the field angle FOV range is larger than 120 degrees under the condition of-30-80 ℃ can be met.
Optionally, the object-side surface of the first lens element 10 is a convex surface, and the image-side surface of the first lens element 10 is a concave surface; the object side surface of the second lens element 20 is a concave surface, and the image side surface of the first lens element 20 is a concave surface or a convex surface; the object-side surface of the third lens element 30 is convex, and the image-side surface of the third lens element 30 is concave; the object-side surface of the fourth lens element 40 is convex, and the image-side surface of the fourth lens element 40 is convex; the object-side surface of the fifth lens element 50 is convex, and the image-side surface of the fifth lens element 50 is convex; the object-side surface of the sixth lens element 60 is concave, and the image-side surface of the sixth lens element 60 is concave; the object-side surface of the seventh lens element 70 is convex, and the image-side surface of the seventh lens element 70 is convex.
It is understood that, in the implementation, the shape of the specific lens can be selected according to the design of the optical power, and the above is only a specific example and is not a limitation to the embodiment of the present invention.
Optionally, the surface type of the aspheric lens satisfies the formula:
wherein z represents an axial vector height of the aspherical surface in the optical axis direction, r represents a distance from a point at which the vector height is calculated to the center,
r represents a curvature radius of the face center, k represents a conic coefficient, and A, B, C, D, E, F represents a high-order aspherical coefficient.
Illustratively, table 1 shows design parameters of a specific embodiment of the fixed-focus lens shown in fig. 1, where the focal length F is 4.28mm and the F-number F is 1.0.
TABLE 1 design values for lenses in fixed-focus lens
The surface numbers in table 1 are numbered in accordance with the surface order of the respective lenses, where "S1" represents the front surface (surface on the object side) of the first lens 10, "S2" represents the rear surface (surface on the image side) of the first lens 10, and so on, "S16" and "S17" respectively represent the front and rear surfaces of the front cover glass of the photosensitive chip; "STO" represents the diaphragm of the fixed focus lens; the curvature radius represents the bending degree of the lens surface, a positive value represents that the surface is bent to the image surface side, a negative value represents that the surface is bent to the object surface side, wherein 'PL' represents that the surface is a plane, and the curvature radius is infinite; the thickness represents the central axial distance from the current surface to the next surface, and the refractive index represents the deflection capability of the material between the current surface and the next surface to light; the abbe number represents the dispersion characteristic of the material between the current surface and the next surface to light; the k value represents the magnitude of the best fitting conic coefficient for the aspheric surface.
Table 2 shows the aspheric surface type parameters in this embodiment:
TABLE 2 design value of aspheric coefficients in fixed-focus lens
Wherein 1.44E-003 representsCoefficient A of surface number S3 was 1.44X 10-3。
Fig. 2 is a schematic view of an axial aberration curve of a fixed focus lens according to an embodiment of the present invention, fig. 3 is a schematic view of a field curve of a fixed focus lens according to an embodiment of the present invention, and fig. 4 is a schematic view of a distortion curve of a fixed focus lens according to an embodiment of the present invention, where as can be seen from fig. 2 to 4, the fixed focus lens according to the embodiment of the present invention has a good imaging capability.
Fig. 5 is a schematic structural diagram of another fixed-focus lens according to an embodiment of the present invention, where a focal length F of the lens is 4.30mm, and an F-number F of the lens is 1.0. Table 3 shows design values of parameters of an embodiment of the fixed-focus lens shown in fig. 5:
TABLE 3 design values for lenses in fixed-focus lens
The surface numbers in table 3 are numbered in accordance with the surface order of the respective lenses, where "S1" represents the front surface (surface on the object side) of the first lens 10, "S2" represents the rear surface (surface on the image side) of the first lens 10, and so on, "S16" and "S17" respectively represent the front and rear surfaces of the front cover glass of the photosensitive chip; "STO" represents the diaphragm of the fixed focus lens; the curvature radius represents the bending degree of the lens surface, a positive value represents that the surface is bent to the image surface side, a negative value represents that the surface is bent to the object surface side, wherein 'PL' represents that the surface is a plane, and the curvature radius is infinite; the thickness represents the central axial distance from the current surface to the next surface, and the refractive index represents the deflection capability of the material between the current surface and the next surface to light; the abbe number represents the dispersion characteristic of the material between the current surface and the next surface to light; the k value represents the magnitude of the best fitting conic coefficient for the aspheric surface.
Table 4 shows the aspheric surface type parameters in this embodiment:
TABLE 4 design value of aspheric surface coefficient in fixed focus lens
Wherein 1.25E-003 represents that the coefficient A having a surface number S3 is 1.25X 10-3。
Fig. 6 is a schematic view of an axial aberration curve of another fixed-focus lens provided in the embodiment of the present invention, fig. 7 is a schematic view of a field curve of another fixed-focus lens provided in the embodiment of the present invention, and fig. 8 is a schematic view of a distortion curve of another fixed-focus lens provided in the embodiment of the present invention, where fig. 6 to 8 show that the fixed-focus lens provided in the embodiment has a good imaging capability.
Fig. 9 is a schematic structural diagram of another fixed-focus lens provided in an embodiment of the present invention, where a focal length F of the lens is 4.27mm, and an F-number F of the lens is 1.0. Table 5 shows design values of parameters of an embodiment of the fixed-focus lens shown in fig. 9:
TABLE 5 design values of lenses in fixed-focus lens
The surface numbers in table 5 are numbered in accordance with the surface order of the respective lenses, where "S1" represents the front surface (surface on the object side) of the first lens 10, "S2" represents the rear surface (surface on the image side) of the first lens 10, and so on, "S16" and "S17" respectively represent the front and rear surfaces of the front cover glass of the photosensitive chip; "STO" represents the diaphragm of the fixed focus lens; the curvature radius represents the bending degree of the lens surface, a positive value represents that the surface is bent to the image surface side, a negative value represents that the surface is bent to the object surface side, wherein 'PL' represents that the surface is a plane, and the curvature radius is infinite; the thickness represents the central axial distance from the current surface to the next surface, and the refractive index represents the deflection capability of the material between the current surface and the next surface to light; the abbe number represents the dispersion characteristic of the material between the current surface and the next surface to light; the k value represents the magnitude of the best fitting conic coefficient for the aspheric surface.
Table 6 shows the aspheric surface type parameters in this embodiment:
TABLE 6 design value of aspheric surface coefficient in fixed-focus lens
Wherein 1.49E-003 represents that the coefficient A with the surface number S3 is 1.49X 10-3。
Fig. 10 is a schematic view of an axial aberration curve of another fixed focus lens provided in an embodiment of the present invention, fig. 11 is a schematic view of a field curve of another fixed focus lens provided in an embodiment of the present invention, and fig. 12 is a schematic view of a distortion curve of another fixed focus lens provided in an embodiment of the present invention, in which fig. 10 to 12 show that the fixed focus lens provided in this embodiment has a good imaging capability.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A fixed focus lens is characterized by comprising a first lens with negative focal power, a second lens with negative focal power, a third lens with positive focal power or negative focal power, a diaphragm, a fourth lens with positive focal power, a fifth lens with positive focal power, a sixth lens with negative focal power and a seventh lens with positive focal power, which are sequentially arranged from an object side to an image side along an optical axis;
wherein the first lens and the third lens are all spherical lenses, and the second lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all aspheric lenses.
2. The prime lens according to claim 1, wherein the first lens and the third lens are all glass spherical lenses, and the second lens, the fifth lens, the sixth lens and the seventh lens are all plastic aspherical lenses.
3. The prime lens according to claim 2, wherein the fourth lens is a glass aspheric lens or a plastic aspheric lens.
4. The prime lens according to claim 1, wherein the first lens satisfies:
1.5<|f1/f|<4.0；
where f1 denotes a focal length of the first lens, and f denotes a focal length of the prime lens.
5. The prime lens according to claim 1, wherein the second lens satisfies:
2.0<|f2/f|<5.0；
1.0<|ET2/CT2|<2.0；
where f2 denotes a focal length of the second lens, f denotes a focal length of the prime lens, ET2 denotes a thickness of an edge of the second lens in an axial direction or a thickest position in the axial direction, and CT2 denotes a center thickness of the second lens.
6. The prime lens according to claim 1, wherein the third lens satisfies:
|f3/f|>5.0；
where f3 denotes a focal length of the third lens, and f denotes a focal length of the prime lens.
7. The prime lens according to claim 1, wherein the fourth lens satisfies:
1.5<|f4/f|<4.0；
where f4 denotes a focal length of the fourth lens, and f denotes a focal length of the prime lens.
8. The prime lens according to claim 1, wherein the fifth lens to the seventh lens satisfy:
1.5<|f5/f|<4.0；
1.1<|f6/f|<3.0；
1.5<|f7/f|<4.0；
40<vd5<70；
20<vd6<40；
40<vd7<70；
wherein f5, f6, and f7 denote focal lengths of the fifth lens, the sixth lens, and the seventh lens, respectively, f denotes a focal length of the fixed-focus lens, and vd5, vd6, and vd7 denote abbe numbers of the fifth lens, the sixth lens, and the seventh lens, respectively.
9. The prime lens according to claim 1, wherein the object-side surface of the first lens element is convex, and the image-side surface of the first lens element is concave; the object side surface of the second lens is a concave surface, and the image side surface of the first lens is a concave surface or a convex surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a convex surface; the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a convex surface; the object side surface of the sixth lens is a concave surface, and the image side surface of the sixth lens is a concave surface; the object side surface of the seventh lens element is a convex surface, and the image side surface of the seventh lens element is a convex surface.
10. The prime lens according to claim 1, wherein the prime lens satisfies:
5.0<TTL/f<10.0；
wherein TTL represents the optical total length of the fixed-focus lens, and f represents the focal length of the fixed-focus lens.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112731626A (en) * | 2021-01-19 | 2021-04-30 | 中山联合光电科技股份有限公司 | Optical lens |
| CN112987263A (en) * | 2021-04-27 | 2021-06-18 | 江西联创电子有限公司 | Fixed-focus lens and imaging device |
| CN113031212A (en) * | 2020-12-29 | 2021-06-25 | 福建福光天瞳光学有限公司 | 4K pixel automobile data recorder optical system and imaging method thereof |
| CN113625422A (en) * | 2021-06-29 | 2021-11-09 | 南京信息工程大学 | Super large image plane wide-angle lens |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113031212A (en) * | 2020-12-29 | 2021-06-25 | 福建福光天瞳光学有限公司 | 4K pixel automobile data recorder optical system and imaging method thereof |
| CN113031212B (en) * | 2020-12-29 | 2024-01-12 | 福建福光天瞳光学有限公司 | 4K pixel automobile data recorder optical system and imaging method thereof |
| CN112731626A (en) * | 2021-01-19 | 2021-04-30 | 中山联合光电科技股份有限公司 | Optical lens |
| CN112987263A (en) * | 2021-04-27 | 2021-06-18 | 江西联创电子有限公司 | Fixed-focus lens and imaging device |
| CN113625422A (en) * | 2021-06-29 | 2021-11-09 | 南京信息工程大学 | Super large image plane wide-angle lens |
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