CN216718794U - Fixed focus lens - Google Patents
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- CN216718794U CN216718794U CN202220009387.7U CN202220009387U CN216718794U CN 216718794 U CN216718794 U CN 216718794U CN 202220009387 U CN202220009387 U CN 202220009387U CN 216718794 U CN216718794 U CN 216718794U
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Abstract
The embodiment of the utility model provides a fixed-focus lens, which relates to the technical field of optical lenses, and comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object space to an image space along an optical axis; the first lens, the third lens and the fifth lens have negative focal power, the fourth lens and the sixth lens have positive focal power, and the second lens has positive focal power or negative focal power. The embodiment of the utility model provides a fixed focus lens, which is used for realizing large aperture, small volume, low cost and stable high and low temperature performance of the fixed focus lens.
Description
Technical Field
The utility model relates to an optical 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. 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.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a fixed focus lens, which is used for realizing large aperture, small volume, low cost and stable high and low temperature performance of the fixed focus lens.
The embodiment of the utility model provides a fixed-focus lens, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object space to an image space along an optical axis;
the first lens, the third lens and the fifth lens have negative focal power, the fourth lens and the sixth lens have positive focal power, and the second lens has positive focal power or negative focal power.
Optionally, the optical module further comprises a diaphragm, wherein the diaphragm is located between the second lens and the third lens, or the diaphragm is located between the third lens and the fourth lens.
Optionally, an object-side surface of the first lens element is a concave surface, and an image-side surface of the first lens element is a concave surface or a convex 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 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 concave surface;
the object side surface of the sixth lens element is a convex surface, and the image side surface of the sixth lens element is a convex surface.
Optionally, the first lens and the fourth lens are glass spherical lenses;
the second lens, the third lens, the fifth lens and the sixth lens are plastic aspherical lenses.
Optionally, the fourth lens is a glass spherical lens;
the first lens, the second lens, the third lens, the fifth lens and the sixth lens are plastic aspherical lenses.
Optionally, the following are satisfied:
-0.459＜φ1/φ＜-0.090；
-0.123＜φ2/φ＜0.245；
-0.295＜φ3/φ＜-0.009；
0.643＜φ4/φ＜1.089；
-1.199＜φ5/φ＜-0.896；
1.002＜φ6/φ＜1.291；
wherein, phi 1 is the focal power of the first lens, phi 2 is the focal power of the second lens, phi 3 is the focal power of the third lens, phi 4 is the focal power of the fourth lens, phi 5 is the focal power of the fifth lens, phi 6 is the focal power of the sixth lens, and phi is the focal power of the fixed focus lens.
Optionally, the following are satisfied:
1.52≤n1≤1.69；
1.40≤n2≤1.71；
1.48≤n3≤1.76；
1.40≤n4≤1.65；
1.59≤n5≤1.70；
1.46≤n6≤1.59；
wherein n1 is a refractive index of the first lens, n2 is a refractive index of the second lens, n3 is a refractive index of the third lens, n4 is a refractive index of the fourth lens, n5 is a refractive index of the fifth lens, and n6 is a refractive index of the sixth lens.
Optionally, the following are satisfied:
33.6≤v1≤95；
23.8≤v2≤95；
26.2≤v3≤39.7；
37.8≤v4≤61；
16.4≤v5≤35；
39.2≤v6≤95；
wherein v1 is an abbe number of the first lens, v2 is an abbe number of the second lens, v3 is an abbe number of the third lens, v4 is an abbe number of the fourth lens, v5 is an abbe number of the fifth lens, and v6 is an abbe number of the sixth lens.
Optionally, the following are satisfied:
IC/TTL≥0.310；
wherein, IC is the image surface diameter of the fixed focus lens, and TTL is the total length of the fixed focus lens.
Optionally, the following are satisfied:
BFL/TTL≥0.30；
and the BFL is the back focus of the fixed focus lens, and the TTL is the total length of the fixed focus lens.
The embodiment of the utility model provides a fixed focus lens, wherein a first lens has negative focal power, a second lens has positive focal power or negative focal power, a third lens has negative focal power, a fourth lens has positive focal power, a fifth lens has negative focal power, and a sixth lens has positive focal power, so that the large aperture, small volume, low cost and stable high and low temperature performance of the fixed focus lens are realized.
Drawings
Fig. 1 is a detailed structural diagram of a fixed focus lens in the first embodiment;
fig. 2 is a spherical aberration curve chart of a fixed focus lens in the first embodiment;
FIG. 3 is a diagram illustrating a chromatic aberration of a fixed-focus lens according to an embodiment of the present invention;
fig. 4 is a specific structural diagram of a fixed-focus lens in the second embodiment;
fig. 5 is a spherical aberration curve chart of a fixed-focus lens in the second embodiment;
FIG. 6 is a diagram illustrating a chromatic aberration of a fixed-focus lens according to a second embodiment of the present invention;
fig. 7 is a detailed structural diagram of a fixed-focus lens in the third embodiment;
fig. 8 is a spherical aberration curve chart of a fixed-focus lens in the third embodiment;
fig. 9 is a chromatic aberration curve diagram of a fixed-focus lens in the third embodiment.
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 utility model and are not limiting of the utility model. 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.
Example one
Fig. 1 is a detailed structural diagram of a fixed-focus lens in the first embodiment, and referring to fig. 1, the fixed-focus lens includes a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, and a sixth lens 6, which are sequentially arranged from an object side to an image side along an optical axis. Wherein the first lens 1, the third lens 3 and the fifth lens 5 have negative focal power, the fourth lens 4 and the sixth lens 6 have positive focal power, and the second lens 2 has positive focal power.
The embodiment of the utility model provides a fixed focus lens, wherein a first lens 1 has negative focal power, a second lens 2 has positive focal power or negative focal power, a third lens 3 has negative focal power, a fourth lens 4 has positive focal power, a fifth lens 5 has negative focal power, and a sixth lens 6 has positive focal power, so that the fixed focus lens has stable large aperture, small volume, low cost, high and low temperature performance.
Optionally, the prime lens further includes a STOP, which is located between the second lens 2 and the third lens 3.
Optionally, the object-side surface of the first lens 1 is a concave surface, and the image-side surface of the first lens 1 is a concave surface, that is, the first lens 1 is a biconcave lens. The object-side surface of the second lens element 2 is concave, and the image-side surface of the second lens element 2 is convex, i.e., the second lens element 2 is a meniscus lens element. The object-side surface of the third lens element 3 is convex, and the image-side surface of the third lens element 3 is concave, i.e., the third lens element 3 is a convex-concave lens. The object-side surface of the fourth lens element 4 is convex, and the image-side surface of the fourth lens element 4 is convex, i.e., the fourth lens element 4 is a biconvex lens. The object-side surface of the fifth lens element 5 is convex, and the image-side surface of the fifth lens element 5 is concave, i.e. the fifth lens element 5 is a convex-concave lens. The object-side surface of the sixth lens element 6 is a convex surface, and the image-side surface of the sixth lens element 6 is a convex surface, that is, the sixth lens element 6 is a biconvex lens.
Optionally, the first lens 1 and the fourth lens 4 are glass spherical lenses. The second lens 2, the third lens 3, the fifth lens 5, and the sixth lens 6 are plastic aspherical lenses. The embodiment of the utility model provides a telephoto lens with F.NO less than 1.56, which adopts glass-plastic mixed lens matching to realize the characteristics of low cost and stable high and low temperature performance, can meet the use conditions of-40-80 ℃, can be matched with a 1/2.7' target surface sensor chip to the maximum extent, and has the characteristics of small volume, small purple edge, small distortion and day and night confocal property.
Optionally, the optical powers of the first lens 1 to the sixth lens 6 satisfy: -0.459 < 1/φ < -0.090, -0.123 < φ 2/φ < 0.245, -0.295 < φ 3/φ < -0.009, 0.643 < φ 4/φ < 1.089, -1.199 < φ 5/φ < -0.896, 1.002 < φ 6/φ < 1.291. Wherein, phi 1 is the focal power of the first lens 1, phi 2 is the focal power of the second lens 2, phi 3 is the focal power of the third lens 3, phi 4 is the focal power of the fourth lens 4, phi 5 is the focal power of the fifth lens 5, phi 6 is the focal power of the sixth lens 6, and phi is the focal power of the fixed focus lens.
Alternatively, the refractive indices of the first lens 1 to the sixth lens 6 satisfy: n1 is more than or equal to 1.52 and less than or equal to 1.69, n2 is more than or equal to 1.40 and less than or equal to 1.71, n3 is more than or equal to 1.48 and less than or equal to 1.76, n4 is more than or equal to 1.40 and less than or equal to 1.65, n5 is more than or equal to 1.59 and less than or equal to 1.70, and n6 is more than or equal to 1.46 and less than or equal to 1.59. Where n1 is a refractive index of the first lens 1, n2 is a refractive index of the second lens 2, n3 is a refractive index of the third lens 3, n4 is a refractive index of the fourth lens 4, n5 is a refractive index of the fifth lens 5, and n6 is a refractive index of the sixth lens 6.
Alternatively, the abbe numbers of the first lens 1 to the sixth lens 6 satisfy: v1 is more than or equal to 33.6 and less than or equal to 95, v2 is more than or equal to 23.8 and less than or equal to 95, v3 is more than or equal to 26.2 and less than or equal to 39.7, v4 is more than or equal to 37.8 and less than or equal to 61, v5 is more than or equal to 16.4 and less than or equal to 35, and v6 is more than or equal to 39.2 and less than or equal to 95. Where v1 is the abbe number of the first lens 1, v2 is the abbe number of the second lens 2, v3 is the abbe number of the third lens 3, v4 is the abbe number of the fourth lens 4, v5 is the abbe number of the fifth lens 5, and v6 is the abbe number of the sixth lens 6.
Optionally, the fixed focus lens satisfies: IC/TTL is more than or equal to 0.310. Wherein, IC is the image surface diameter of the fixed focus lens, and TTL is the total length of the fixed focus lens. When the IC/TTL is more than or equal to 0.310, the fixed-focus lens has a larger target surface and a smaller volume, namely, the fixed-focus lens has better imaging quality and a clearer picture and has a smaller volume.
Optionally, the fixed focus lens satisfies: BFL/TTL is more than or equal to 0.30. Wherein BFL is the back focus of the fixed focus lens, and TTL is the total length of the fixed focus lens. When the BFL/TTL is more than or equal to 0.30, the back focus of the fixed focus lens is not too small, so that the imaging sensor and the flat filter can be ensured to have enough installation space.
Table 1 design value of fixed focus lens in the first embodiment
| Number of noodles | Surface type | Radius of curvature (mm) | Thickness (mm) | Refractive index | Coefficient of dispersion | Half diameter |
| S1 | Spherical surface | -20.76 | 1.83 | 1.57 | 34.6 | 3.348 |
| S2 | Spherical surface | 45.89 | 1.29 | 2.852 | ||
| S3 | Aspherical surface | -3.4 | 2.49 | 1.64 | 39.6 | 2.600 |
| S4 | Aspherical surface | -3.96 | 0.1 | 3.334 | ||
| Diaphragm | Plane surface | Infinite number of elements | 0.1 | 3.197 | ||
| S6 | Aspherical surface | 11.7 | 0.72 | 1.54 | 35.4 | 3.366 |
| S7 | Aspherical surface | 8.64 | 0.1 | 3.390 | ||
| S8 | Spherical surface | 7.94 | 3.04 | 1.44 | 38.8 | 4.200 |
| S9 | Spherical surface | -8.33 | 0.1 | 4.200 | ||
| S10 | Aspherical surface | 7.88 | 1.73 | 1.64 | 22.8 | 3.362 |
| S11 | Aspherical surface | 2.69 | 0.31 | 3.045 | ||
| S12 | Aspherical surface | 4.89 | 3.46 | 1.54 | 91.1 | 2.900 |
| S13 | Aspherical surface | -9.97 | 5.3 | 2.999 | ||
| S14 | Plane surface | Infinite number of elements | 0.7 | 1.52 | 64.21 | 3.600 |
| S15 | Plane surface | Infinite number of elements | 0.82 | 3.600 |
Table 1 shows a design value of a fixed-focus lens in the first embodiment, where the specific value can be adjusted according to product requirements, and is not a limitation to the embodiment of the present invention. The fixed focus lens shown in table 1 may be that shown in fig. 1. A lens generally comprises two surfaces, each of which is a refractive surface. The surface numbers in table 1 are numbered according to the surface of each lens. Here, the surface number "S1" indicates the front surface of the first lens 1, the surface number "S2" indicates the rear surface of the first lens 1, and so on, which is not described herein again. Note that the radius of curvature represents the degree of curvature of the lens surface, with positive values representing the center of curvature on the image side of the surface and negative values representing the center of curvature on the image side of the surface. The numerical values in the column for "thickness" represent the axial distance from the current surface to the next surface. The column "refractive index" indicates the refractive index of the medium between the current surface to the next surface. The spaces in the column "refractive index" are the refractive index of air, which is 1. The dispersion coefficient represents the dispersion characteristic of the material between the current surface and the next surface to the light, and the blank space represents that the current position is air.
Alternatively, the aspheric equation is as follows:
wherein Z is the rise of the aspheric surface, c is the basic curvature at the vertex, and k isConic constant, r is the radial coordinate perpendicular to the optical axis, aiIs a coefficient of a higher order termir2iHigh order terms of the aspheric surface.
Table 2 a design value of aspherical surface coefficient of lens in fixed focus lens in the first embodiment
Table 2 shows design values of aspheric coefficients of lenses in the fixed-focus lens in the first embodiment, and specific values of the design values can be adjusted according to product requirements, which is not limited to the embodiments of the present invention. The fixed focus lens shown in table 2 may be that shown in fig. 1. The column of "surface number" in table 2 corresponds to the meaning of "surface number" in table 1, and for example, the surface number "S3" also indicates the front surface of the second lens 2. "E" in the examples of the present invention means an index with a base 10.
Example two
The same points as those in the first embodiment will not be described again, and the difference from the first embodiment is that the second lens 2 has negative power. The first lens 1 is a plastic aspherical lens.
Table 3 design value of fixed-focus lens in the second embodiment
| Number of noodles | Surface type | Radius of curvature (mm) | Thickness (mm) | Refractive index | Coefficient of dispersion | Half diameter |
| S1 | Aspherical surface | -15.5 | 1.14 | 1.64 | 95 | 3.383 |
| S2 | Aspherical surface | 84.12 | 1.31 | 3.014 | ||
| S3 | Aspherical surface | -3.37 | 2.17 | 1.43 | 95 | 2.800 |
| S4 | Aspherical surface | -4.12 | 0.32 | 3.364 | ||
| Diaphragm | Plane surface | Infinite number of elements | 0.45 | 3.164 | ||
| S6 | Aspherical surface | 12.33 | 0.7 | 1.71 | 27.2 | 3.389 |
| S7 | Aspherical surface | 8.26 | 0.1 | 3.449 | ||
| S8 | Spherical surface | 7.35 | 3.5 | 1.6 | 48 | 4.200 |
| S9 | Spherical surface | -9.37 | 0.1 | 4.200 | ||
| S10 | Aspherical surface | 7.65 | 1.28 | 1.65 | 34 | 3.536 |
| S11 | Aspherical surface | 2.6 | 0.25 | 3.227 | ||
| S12 | Aspherical surface | 4.12 | 3.15 | 1.51 | 95 | 3.100 |
| S13 | Aspherical surface | -10.04 | 5.3 | 3.083 | ||
| S14 | Plane surface | Infinite number of elements | 0.7 | 1.52 | 64.21 | 3.600 |
| S15 | Plane surface | Infinite number of elements | 1.54 | 3.600 |
Table 3 shows a design value of the fixed-focus lens in the second embodiment, and the specific value can be adjusted according to product requirements, which is not a limitation to the embodiments of the present invention. The fixed focus lens shown in table 3 may be that shown in fig. 4.
Table 4 design values of aspherical coefficients of lenses in fixed focus lens in example two
Table 4 shows design values of aspheric coefficients of lenses in the fixed-focus lens in the second embodiment, and specific values of the design values can be adjusted according to product requirements, which is not limited to the embodiments of the present invention. The fixed focus lens shown in table 4 may be that shown in fig. 4.
EXAMPLE III
The same points as those in the first embodiment will not be described again, and the difference from the first embodiment is that the STOP is located between the third lens 3 and the fourth lens 4. The object side surface of the first lens element 1 is a concave surface, the image side surface of the first lens element 1 is a convex surface, and the first lens element 1 is a meniscus lens element.
Table 5 design value of fixed focus lens in the third embodiment
| Number of noodles | Surface type | Radius of curvature (mm) | Thickness (mm) | Refractive index | Coefficient of dispersion | Half diameter |
| S1 | Spherical surface | -17.13 | 2.1 | 1.62 | 70 | 3.350 |
| S2 | Spherical surface | -60.17 | 1.23 | 2.885 | ||
| S3 | Aspherical surface | -3.36 | 2.51 | 1.66 | 24.8 | 2.600 |
| S4 | Aspherical surface | -3.97 | 0.35 | 3.361 | ||
| s5 | Aspherical surface | 13 | 0.7 | 1.53 | 38.7 | 3.364 |
| S6 | Aspherical surface | 9.18 | 0.72 | 3.371 | ||
| Diaphragm | Plane surface | Infinite number of elements | -0.6 | 3.254 | ||
| S8 | Spherical surface | 8.14 | 3.01 | 1.44 | 60 | 4.200 |
| S9 | Spherical surface | -8.29 | 0.1 | 4.200 | ||
| S10 | Aspherical surface | 7.96 | 1.69 | 1.64 | 17.4 | 3.361 |
| S11 | Aspherical surface | 2.68 | 0.33 | 3.043 | ||
| S12 | Aspherical surface | 4.99 | 3.36 | 1.54 | 40.2 | 2.900 |
| S13 | Aspherical surface | -9.86 | 5.3 | 3.019 | ||
| S14 | Plane surface | Infinite number of elements | 0.7 | 1.52 | 64.21 | 3.600 |
| S15 | Plane surface | Infinite number of elements | 0.72 | 3.600 |
Table 5 shows a design value of the fixed-focus lens in the third embodiment, and the specific value can be adjusted according to product requirements, which is not a limitation to the embodiments of the present invention. The fixed focus lens shown in table 5 may be that shown in fig. 7.
Table 6 design values of aspherical coefficients of lenses in fixed-focus lens in example three
Table 6 shows design values of aspheric coefficients of lenses in the fixed-focus lens in the third embodiment, and specific values of the design values can be adjusted according to product requirements, which is not limited to the embodiments of the present invention. The fixed focus lens shown in table 6 may be that shown in fig. 7.
It is to be noted that the foregoing description is only exemplary of the utility model and that the principles of the technology may be 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 modifications, rearrangements, combinations and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. 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, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side along an optical axis;
the first lens, the third lens and the fifth lens have negative focal power, the fourth lens and the sixth lens have positive focal power, and the second lens has positive focal power or negative focal power.
2. The prime lens according to claim 1, further comprising a diaphragm, the diaphragm being located between the second lens and the third lens, or the diaphragm being located between the third lens and the fourth lens.
3. The fixed-focus lens according to claim 1, wherein the object-side surface of the first lens element is concave, and the image-side surface of the first lens element is concave or convex;
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 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 concave surface;
the object side surface of the sixth lens element is a convex surface, and the image side surface of the sixth lens element is a convex surface.
4. The prime lens according to claim 1, wherein the first lens and the fourth lens are glass spherical lenses;
the second lens, the third lens, the fifth lens and the sixth lens are plastic aspherical lenses.
5. The prime lens according to claim 1, wherein the fourth lens is a glass spherical lens;
the first lens, the second lens, the third lens, the fifth lens and the sixth lens are plastic aspherical lenses.
6. The prime lens according to claim 1, wherein the following conditions are satisfied:
-0.459＜φ1/φ＜-0.090；
-0.123＜φ2/φ＜0.245；
-0.295＜φ3/φ＜-0.009；
0.643＜φ4/φ＜1.089；
-1.199＜φ5/φ＜-0.896；
1.002＜φ6/φ＜1.291；
wherein, phi 1 is the focal power of the first lens, phi 2 is the focal power of the second lens, phi 3 is the focal power of the third lens, phi 4 is the focal power of the fourth lens, phi 5 is the focal power of the fifth lens, phi 6 is the focal power of the sixth lens, and phi is the focal power of the fixed focus lens.
7. The prime lens according to claim 1, wherein the following conditions are satisfied:
1.52≤n1≤1.69；
1.40≤n2≤1.71；
1.48≤n3≤1.76；
1.40≤n4≤1.65；
1.59≤n5≤1.70；
1.46≤n6≤1.59；
wherein n1 is a refractive index of the first lens, n2 is a refractive index of the second lens, n3 is a refractive index of the third lens, n4 is a refractive index of the fourth lens, n5 is a refractive index of the fifth lens, and n6 is a refractive index of the sixth lens.
8. The prime lens according to claim 1, wherein the following conditions are satisfied:
33.6≤v1≤95；
23.8≤v2≤95；
26.2≤v3≤39.7；
37.8≤v4≤61；
16.4≤v5≤35；
39.2≤v6≤95；
wherein v1 is an abbe number of the first lens, v2 is an abbe number of the second lens, v3 is an abbe number of the third lens, v4 is an abbe number of the fourth lens, v5 is an abbe number of the fifth lens, and v6 is an abbe number of the sixth lens.
9. The prime lens according to claim 1, wherein the following conditions are satisfied:
IC/TTL≥0.310；
wherein, IC is the image surface diameter of the fixed focus lens, and TTL is the total length of the fixed focus lens.
10. The prime lens according to claim 1, wherein the following conditions are satisfied:
BFL/TTL≥0.30；
and the BFL is the back focus of the fixed focus lens, and the TTL is the total length of the fixed focus lens.
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| CN202220009387.7U CN216718794U (en) | 2022-01-05 | 2022-01-05 | Fixed focus lens |
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| CN202220009387.7U CN216718794U (en) | 2022-01-05 | 2022-01-05 | Fixed focus lens |
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