CN212905678U - Fixed focus lens - Google Patents
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- CN212905678U CN212905678U CN202021912040.0U CN202021912040U CN212905678U CN 212905678 U CN212905678 U CN 212905678U CN 202021912040 U CN202021912040 U CN 202021912040U CN 212905678 U CN212905678 U CN 212905678U
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Abstract
The embodiment of the utility model discloses tight shot is disclosed. The fixed-focus lens comprises a first lens with negative focal power, a second lens with negative focal power, a diaphragm, a third lens with positive focal power, 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, the second lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all aspheric lenses, and the third lens is a spherical lens; the first lens and the second lens satisfy: 1.0< | f1/f | < 4.0; l f2/f > 7.0; f1 denotes a focal length of the first lens, f2 denotes a focal length of the second lens, and f denotes a focal length of the prime lens. The embodiment of the utility model provides a tight shot has big light ring, low-cost, the stable characteristics of high low temperature performance, possess big target surface simultaneously, can match 1/1.8 inch's imaging chip.
Description
Technical Field
The embodiment of the utility model provides a relate to the camera lens technique, especially relate to a tight shot.
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 progress of the industry, the security lens develops towards a large aperture and high image quality. The bigger diaphragm can also have good imaging effect under dim environment through more light, but, traditional big diaphragm tight shot has bulky, the resolution ratio is low and shortcoming with high costs. Therefore, the design of a fixed focus lens with large aperture, low cost, large target surface and stable high and low temperature performance is a market development trend.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a tight shot, this camera lens have big light ring, low cost, the stable characteristics of high low temperature performance, possess big target surface simultaneously, can match 1/1.8 inch's imaging chip.
The embodiment of the utility model provides a fixed focus camera lens, include the first lens of negative focal power, the second lens of negative focal power, the diaphragm of negative focal power, the third lens of positive focal power, the fourth lens of positive focal power, the fifth lens of positive focal power, the sixth lens of negative focal power and the seventh lens of positive focal power that arrange along the optical axis in proper order from the object space to the image space;
the first lens, the second lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all aspheric lenses, and the third lens is a spherical lens;
the first lens and the second lens satisfy:
1.0<|f1/f|<4.0；
|f2/f|>7.0；
wherein f1 denotes a focal length of the first lens, f2 denotes a focal length of the second lens, and f denotes a focal length of the prime lens.
Optionally, the third lens and the fourth lens satisfy:
1.0<|f3/f|<4.0；
|f4/f|>7；
wherein f3 denotes a focal length of the third lens, and f4 denotes a focal length of the fourth lens.
Optionally, the fifth lens to the seventh lens satisfy:
0.5<|f5/f|<3.0；
0.5<|f6/f|<3.0；
1.0<|f7/f|<4.0；
wherein f5 denotes a focal length of the fifth lens, f6 denotes a focal length of the sixth lens, and f7 denotes a focal length of the seventh lens.
Optionally, the first lens, the second lens, the fifth lens, the sixth lens, and the seventh lens are all plastic aspheric spherical lenses.
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 second 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 convex 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 third lens is a glass spherical lens, and the fourth lens is a glass aspherical lens.
Optionally, an object-side surface of the third lens element is a convex surface, and an image-side surface of the third lens element is a convex surface; the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface.
Optionally, an f-number of the fixed-focus lens is less than or equal to 1.0.
The embodiment of the utility model provides a fixed focus camera lens, include along the optical axis from the object space to the image space first lens of negative focal power, the second lens of negative focal power, the diaphragm of positive focal power, the third lens of positive focal power, the fourth lens of positive focal power, the fifth lens of positive focal power, the sixth lens of negative focal power and the seventh lens of positive focal power that arrange in proper order; the first lens, the second lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all aspheric lenses, and the third lens is a spherical lens; the first lens and the second lens satisfy: 1.0< | f1/f | < 4.0; l f2/f > 7.0; where f1 denotes a focal length of the first lens, f2 denotes a focal length of the second lens, and f denotes a focal length of the prime lens. More light rays can be received by the first lens and the second lens with negative focal power; the third lens and the fourth lens with positive focal power are used for balancing high and low temperature aberration and reducing the total length of the lens; by combining aspheric lenses of the fifth lens to the seventh lens for correcting external aberrations such as field curvature, coma, astigmatism and the like; through the collocation of the spherical lens and the aspheric lens, the prime lens with large aperture, low cost and stable high and low temperature performance is realized, and meanwhile, the prime lens has a large target surface and can be matched with an imaging chip of 1/1.8 inch.
Drawings
Fig. 1 is a schematic structural diagram of a fixed focus lens provided in an embodiment of the present invention;
fig. 2 is a schematic diagram 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 curvature curve of a fixed focus lens according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a distortion curve of a fixed-focus lens according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.
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 embodiments of the present invention are described in terms of 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 meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
Fig. 1 is a schematic structural diagram of a fixed focus lens according to an embodiment of the present invention. Referring to fig. 1, a fixed focus lens according to an embodiment of the present invention includes a first lens 10 with negative refractive power, a second lens 20 with negative refractive power, a diaphragm 80, a third lens 30 with positive refractive power, a fourth lens 40 with positive refractive power, a fifth lens 50 with positive refractive power, a sixth lens 60 with negative refractive power, and a seventh lens 70 with positive refractive power, which are sequentially arranged along an optical axis from an object side to an image side; the first lens 10, 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, and the third lens 30 is a spherical lens; the first lens 10 and the second lens 20 satisfy:
1.0<|f1/f|<4.0；
|f2/f|>7.0；
where f1 denotes a focal length of the first lens 10, f2 denotes a focal length of the second lens 20, and f denotes a focal length of the prime lens.
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, the lenses can be fixed in a lens barrel (not shown in fig. 1), and the optical power and the shape of the lenses can be reasonably distributed, for example, the first lens 10 and the second lens 20 with negative optical power are arranged to facilitate light receiving, and the field angle is increased, and optionally, the f-number of the fixed focus lens is less than or equal to 1.0. The aperture 80 can adjust the size of a field of view, block off the light rays of a far axis, the positive focal power of the third lens 30 and the fourth lens 40 balances the high and low temperature aberration and reduces the total length of the lens, and the aspheric lens combination of the fifth lens 50 to the seventh lens 70 is used for correcting the off-axis aberration and improving the imaging quality.
According to the technical scheme of the embodiment, more light rays can be received by arranging the first lens and the second lens with negative focal power; the third lens and the fourth lens with positive focal power are used for balancing high and low temperature aberration and reducing the total length of the lens; by combining aspheric lenses of the fifth lens to the seventh lens for correcting external aberrations such as field curvature, coma, astigmatism and the like; through the collocation of the spherical lens and the aspheric lens, the prime lens with large aperture, low cost and stable high and low temperature performance is realized, and meanwhile, the prime lens has a large target surface and can be matched with an imaging chip of 1/1.8 inch.
On the basis of the above embodiment, optionally, the first lens 10, the second lens 20, the fifth lens 50, the sixth lens 60, and the seventh lens 70 are all plastic aspheric spherical lenses. Optionally, the third lens 30 is a glass spherical lens, and the fourth lens 40 is a glass aspherical lens.
The third lens 30 and the fourth lens 40 are both glass lenses, have good physical and chemical properties and stronger environmental adaptability, and can balance high and low temperature and reduce the total length of the lens; 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 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 second lens element 20 is a convex surface; 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 a concave surface, and the image-side surface of the sixth lens element 60 is a convex surface; 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.
Optionally, the object-side surface of the third lens element 30 is a convex surface, and the image-side surface of the third lens element 30 is a convex surface; the object-side surface of the fourth lens element 40 is concave, and the image-side surface of the fourth lens element 40 is convex.
It is understood that, in 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.
Alternatively, the third lens 30 and the fourth lens 40 satisfy:
1.0<|f3/f|<4.0；
|f4/f|>7；
where f3 denotes a focal length of the third lens 30, and f4 denotes a focal length of the fourth lens 40.
Alternatively, the fifth lens 50 to the seventh lens 70 satisfy:
0.5<|f5/f|<3.0；
0.5<|f6/f|<3.0；
1.0<|f7/f|<4.0；
where f5 denotes a focal length of the fifth lens 50, f6 denotes a focal length of the sixth lens 60, and f7 denotes a focal length of the seventh lens 70.
By comprehensively setting the optical parameters of the first lens 10 to the seventh lens 70, the fixed focus lens with large aperture, low cost and stable high and low temperature performance can be realized, and meanwhile, the fixed focus lens has a large target surface and can be matched with a 1/1.8 inch imaging chip.
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.
Exemplarily, table 1 is a parameter design value of a specific embodiment of the fixed focus lens provided in the embodiment of the present invention, a focal length F of the lens is 5mm, and an 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-1.50E-003 represents that the coefficient A having a face number S3 is-1.50X 10-3。
Fig. 2 is shown as the embodiment of the utility model provides a pair of axial aberration curve schematic diagram of tight shot, fig. 3 is shown to be the utility model provides a pair of tight shot's field curve schematic diagram, fig. 4 is shown to be the utility model discloses a pair of tight shot's distortion curve schematic diagram that embodiment provides, wherein can know by fig. 2 ~ 4, the tight shot that this embodiment provides has good imaging ability.
It is obvious that the above embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. A fixed focus lens is characterized by comprising a first lens with negative focal power, a second lens with negative focal power, a diaphragm, a third lens with positive focal power, 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, the second lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all aspheric lenses, and the third lens is a spherical lens;
the first lens and the second lens satisfy:
1.0<|f1/f|<4.0；
|f2/f|>7.0；
wherein f1 denotes a focal length of the first lens, f2 denotes a focal length of the second lens, and f denotes a focal length of the prime lens.
2. The prime lens according to claim 1, wherein the third lens and the fourth lens satisfy:
1.0<|f3/f|<4.0；
|f4/f|>7；
wherein f3 denotes a focal length of the third lens, and f4 denotes a focal length of the fourth lens.
3. The prime lens according to claim 1, wherein the fifth lens to the seventh lens satisfy:
0.5<|f5/f|<3.0；
0.5<|f6/f|<3.0；
1.0<|f7/f|<4.0；
wherein f5 denotes a focal length of the fifth lens, f6 denotes a focal length of the sixth lens, and f7 denotes a focal length of the seventh lens.
4. The prime lens according to claim 1, wherein the first lens, the second lens, the fifth lens, the sixth lens and the seventh lens are all plastic aspherical lenses.
5. The prime lens according to claim 4, 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 second 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 convex 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.
6. The prime lens according to claim 1, wherein the third lens is a glass spherical lens and the fourth lens is a glass aspherical lens.
7. The fixed-focus lens according to claim 6, wherein an object-side surface of the third lens element is convex, and an image-side surface of the third lens element is convex; the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface.
8. The prime lens according to claim 1, wherein an f-number of the prime lens is less than or equal to 1.0.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933960A (en) * | 2021-09-28 | 2022-01-14 | 江西晶超光学有限公司 | Optical lens, camera module, electronic equipment and automobile |
| CN115327742A (en) * | 2021-05-10 | 2022-11-11 | 东莞市宇瞳光学科技股份有限公司 | Fixed focus lens |
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2020
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115327742A (en) * | 2021-05-10 | 2022-11-11 | 东莞市宇瞳光学科技股份有限公司 | Fixed focus lens |
| CN115327742B (en) * | 2021-05-10 | 2024-03-22 | 东莞市宇瞳光学科技股份有限公司 | Fixed focus lens |
| CN113933960A (en) * | 2021-09-28 | 2022-01-14 | 江西晶超光学有限公司 | Optical lens, camera module, electronic equipment and automobile |
| CN113933960B (en) * | 2021-09-28 | 2023-09-05 | 江西晶超光学有限公司 | Optical lens, camera module, electronic equipment and car |
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