CN115097612B - Fixed focus lens - Google Patents
Fixed focus lens Download PDFInfo
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- CN115097612B CN115097612B CN202210856728.9A CN202210856728A CN115097612B CN 115097612 B CN115097612 B CN 115097612B CN 202210856728 A CN202210856728 A CN 202210856728A CN 115097612 B CN115097612 B CN 115097612B
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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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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
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Abstract
The invention relates to a fixed focus lens, comprising: a first lens with negative focal power, a second lens with positive focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with negative focal power, a sixth lens with positive focal power, a seventh lens with positive focal power, an eighth lens with negative focal power, a ninth lens with positive focal power and a flat plate which are sequentially arranged along the direction from an object side to an image side, wherein the second lens is a paraxial region concave-convex lens, the third lens is a paraxial region concave-convex lens, and the fixed focus lens further comprises a diaphragm, and the diaphragm is positioned between the second lens and the third lens; the seventh lens is a paraxial region convex lens; the eighth lens is a paraxial region concave type lens. The lens has the high performance of ultra-large aperture and higher resolution power of 6M, has low cost and small volume, and can realize ultra-high definition imaging at the temperature of-40 ℃ to +80 ℃.
Description
Technical Field
The invention relates to the technical field of optical systems, in particular to a fixed-focus lens.
Background
The fixed focus lens is widely applied to the security monitoring field due to the imaging high definition and the like, infrared band light filling is commonly adopted on the market at present to realize shooting at night, but the infrared imaging definition is not high, real image color information cannot be restored, and therefore the realization of full color at day and night is a direction of future development.
Generally, the larger the clear aperture, the better the imaging quality of the lens in the night environment, but the optical aberration of the large-aperture lens is obviously increased, so that the resolution is poorer, more glass is needed for correction, and the volume and cost of the optical system are increased.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a fixed focus lens which has a super-large aperture, high performance with higher resolution up to 6M, low cost and small volume, and can realize super-high definition imaging in a temperature range of-40 ℃ to +80 ℃.
In order to achieve the above object, the present invention provides a fixed focus lens comprising: the lens comprises a first lens with negative focal power, a second lens with positive focal power, a third lens with negative focal power, a fourth lens with positive focal power, a fifth lens with negative focal power, a sixth lens with positive focal power, a seventh lens with positive focal power, an eighth lens with negative focal power, a ninth lens with positive focal power and a flat plate, wherein the first lens with negative focal power, the second lens with positive focal power, the third lens with negative focal power, the fourth lens with positive focal power, the fifth lens with negative focal power, the sixth lens with positive focal power, the seventh lens with positive focal power, the eighth lens with negative focal power, the ninth lens with positive focal power and the flat plate are sequentially arranged along the direction from the object side to the image side, and the fixed focus lens further comprises a diaphragm, wherein the diaphragm is positioned between the second lens and the third lens.
According to one aspect of the invention, the optical axis is oriented in a direction from the object side to the image side,
the first lens is a paraxial region convex-concave lens;
the second lens is a paraxial region concave-convex lens;
the third lens and the eighth lens are paraxial region concave-concave lenses;
the fourth lens, the seventh lens and the ninth lens are paraxial region convex-convex lenses;
the fifth lens is a convex-concave lens;
the sixth lens is a convex lens.
According to one aspect of the present invention, the first lens, the second lens, the third lens, the fourth lens, the seventh lens, the eighth lens, and the ninth lens are all aspherical lenses;
the fifth lens and the sixth lens are spherical lenses.
According to one aspect of the present invention, the first lens, the second lens, the third lens, the fourth lens, the seventh lens, the eighth lens and the ninth lens are all plastic lenses;
the fifth lens and the sixth lens are both glass lenses.
According to one aspect of the present invention, the effective focal length F of the fixed focus lens satisfies the following relationship: f is more than or equal to 4.5 and less than or equal to 4.8.
According to one aspect of the present invention, the following relation is satisfied between the total optical length TTL of the fixed focus lens and the effective focal length F of the fixed focus lens: TTL/F is not less than 4.6 and not more than 4.9.
According to one aspect of the present invention, the following relationship is satisfied between the optical back Jiao Changdu BFL of the fixed focus lens and the effective focal length F of the fixed focus lens: BFL/F is less than or equal to 0.88 and less than or equal to 0.93.
According to one aspect of the present invention, the FNO number of the fixed focus lens satisfies the following relationship: FNO is more than or equal to 1.0 and less than or equal to 1.07.
According to one aspect of the present invention, the following relation is satisfied between the effective focal length F1 of the first lens and the effective focal length F of the fixed focus lens: -2.5 < F1/F < 2.1.
According to one aspect of the present invention, the effective focal length F2 of the second lens and the effective focal length F of the fixed focus lens satisfy the following relation: F2/F is more than or equal to 3.6 and less than or equal to 10.1.
According to one aspect of the present invention, the effective focal length F3 of the third lens and the effective focal length F of the fixed focus lens satisfy the following relation: -3.2.ltoreq.F3/F.ltoreq.2.0.
According to one aspect of the present invention, the effective focal length F4 of the fourth lens and the effective focal length F of the fixed focus lens satisfy the following relation: F4/F is less than or equal to 3.4 and less than or equal to 4.4.
According to one aspect of the invention, the fifth lens and the sixth lens are cemented to form a cemented doublet having positive optical power.
According to one aspect of the present invention, the following relation is satisfied between the combined focal length F56 of the fifth lens and the sixth lens and the effective focal length F of the fixed focus lens: F56/F is less than or equal to 2.2 and less than or equal to 2.6.
According to one aspect of the present invention, the effective focal length F7 of the seventh lens and the effective focal length F of the fixed focus lens satisfy the following relation: F7/F is less than or equal to 1.5 and less than or equal to 2.0.
According to one aspect of the present invention, the effective focal length F8 of the eighth lens and the effective focal length F of the fixed focus lens satisfy the following relation: -F8/F is less than or equal to 2.0 and less than or equal to-1.4.
According to one aspect of the present invention, the effective focal length F9 of the ninth lens and the effective focal length F of the fixed focus lens satisfy the following relation: F9/F is more than or equal to 2.4 and less than or equal to 3.5.
According to one aspect of the present invention, the chief ray CRA value of the fixed focus lens satisfies the following relationship: CRA is more than or equal to 12.5 and less than or equal to 16.2.
According to the scheme of the invention, through optimal configuration and reasonable collocation of the optical power, the plane, the different shapes and focal length ranges of the object side and the image side of nine lenses and the mixed use of different materials, the fixed focus lens has ultra-high definition imaging performance with ultra-large aperture and higher resolution up to 6M, meanwhile, the low cost and the small volume are considered, the low light imaging is realized, the ultra-high definition imaging can be realized in the temperature range of minus 40 ℃ to plus 80 ℃ without virtual focus, and the fixed focus lens is suitable for different environments with high and low temperatures.
According to an aspect of the present invention, a diaphragm is provided between the second lens and the third lens, and CRA value of the fixed-focus lens optical system can be controlled while balancing aberration.
According to an aspect of the present invention, the following relationship is satisfied between the total optical length TTL of the fixed focus lens and the effective focal length F of the fixed focus lens: TTL/F is more than or equal to 4.6 and less than or equal to 4.9, and the following relation is satisfied between the optical back Jiao Changdu BFL of the fixed focus lens and the effective focal length F of the fixed focus lens: BFL/F is more than or equal to 0.88 and less than or equal to 0.93, so that the lens has high imaging performance and simultaneously realizes miniaturization and small volume, and particularly, the lens comprises the optical total length TTL of a flat plate is less than or equal to 22.5mm.
According to one aspect of the present invention, the FNO number of the fixed focus lens satisfies the following relationship: FNO is more than or equal to 1.0 and less than or equal to 1.07, and has an ultra-large aperture, thereby realizing low-light imaging.
According to an aspect of the present invention, the following relation is satisfied between the effective focal length F1 of the first lens and the effective focal length F of the fixed focus lens: -2.5 < F1/F < 2.1, which can converge the incident light of the optical system, control the system light path, and further reduce the volume.
According to an aspect of the present invention, the following relation is satisfied between the effective focal length F2 of the second lens and the effective focal length F of the fixed focus lens: 3.6 is less than or equal to F2/F is less than or equal to 10.1, and the effective focal length F3 of the third lens and the effective focal length F of the fixed focus lens meet the following relational expression: -3.2 < F3/F < 2.0, which balances the aberrations produced by the light passing through the aperture.
According to an aspect of the present invention, the following relation is satisfied between the effective focal length F4 of the fourth lens and the effective focal length F of the fixed focus lens: F4/F is less than or equal to 3.4 and less than or equal to 4.4, and the high and low temperature performance can be balanced, so that the fixed focus lens is suitable for different environments with high and low temperature, and the imaging is clear in the temperature range of minus 40 ℃ to +80 ℃.
According to an aspect of the present invention, the fifth lens and the sixth lens are cemented to form a cemented doublet having positive optical power, and the combined focal length F56 of the fifth lens and the sixth lens and the effective focal length F of the fixed focus lens satisfy the following relation: F56/F is less than or equal to 2.2 and less than or equal to 2.6, can balance imaging chromatic aberration and improve imaging performance.
According to an aspect of the present invention, the following relation is satisfied between an effective focal length F7 of the seventh lens and an effective focal length F of the fixed focus lens: F7/F is less than or equal to 1.5 and less than or equal to 2.0, and the effective focal length F8 of the eighth lens and the effective focal length F of the fixed focus lens meet the following relational expression: -2.0.ltoreq.F8/F.ltoreq.1.4, the effective focal length F9 of the ninth lens and the effective focal length F of the fixed focus lens satisfying the following relation: F9/F is less than or equal to 2.4 and less than or equal to 3.5, can control aberration, reduce tolerance sensitivity and is favorable for high-image quality imaging of the fixed focus lens.
According to one aspect of the present invention, the chief ray CRA value of the fixed focus lens satisfies the following relationship: 12.5 is less than or equal to CRA and less than or equal to 16.2, is favorable for being compatible with chips, can be adapted to a plurality of sensors, improves market competitiveness, and ensures that the lens has wide application prospect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments will be briefly described below. It is evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
Fig. 1 schematically shows a schematic structure of a fixed focus lens of embodiment 1 of the present invention;
fig. 2 schematically shows a structure of a fixed focus lens according to embodiment 2 of the present invention;
fig. 3 schematically shows a structure of a fixed focus lens of embodiment 3 of the present invention;
fig. 4 schematically shows a structure of a fixed focus lens of embodiment 4 of the present invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The description of the embodiments of this specification should be taken in conjunction with the accompanying drawings, which are a complete description of the embodiments. In the drawings, the shape or thickness of the embodiments may be enlarged and indicated simply or conveniently. Furthermore, portions of the structures in the drawings will be described in terms of separate descriptions, and it should be noted that elements not shown or described in the drawings are in a form known to those of ordinary skill in the art.
Any references to directions and orientations in the description of the embodiments herein are for convenience only and should not be construed as limiting the scope of the invention in any way. The following description of the preferred embodiments will refer to combinations of features which may be present alone or in combination, and the invention is not particularly limited to the preferred embodiments. The scope of the invention is defined by the claims.
Referring to fig. 1, a fixed focus lens provided in an embodiment of the present invention includes: the first lens L1, the second lens L2, the stop STO, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, the ninth lens L9, and the flat plate are arranged in this order along the optical axis from the object side to the image side. The first lens L1, the third lens L3, the fifth lens L5, and the eighth lens L8 are all lenses having negative optical power, and the second lens L2, the fourth lens L4, the sixth lens L6, the seventh lens L7, and the ninth lens L9 are all lenses having positive optical power. The stop STO is disposed between the second lens L2 and the third lens L3, and CRA value of the fixed-focus lens optical system can be controlled while balancing aberration.
In the embodiment of the present invention, along the direction from the object side to the image side of the optical axis, the first lens L1 is a lens having a paraxial region concave-convex shape, the second lens L2 is a lens having a paraxial region concave-convex shape, the third lens L3 and the eighth lens L8 are both lenses having a paraxial region concave-concave shape, the fourth lens L4, the seventh lens L7 and the ninth lens L9 are both lenses having a paraxial region convex shape, the fifth lens L5 is a lens having a convex-concave shape, and the sixth lens L6 is a lens having a convex shape.
According to the optical structure and the technical scheme of the fixed focus lens provided by the embodiment of the invention, through optimizing and configuring the focal power of nine lenses and different shapes of the object side and the image side, the optical structure and the technical scheme of the fixed focus lens realize low cost, small volume, ultra-large aperture, higher resolution, and no virtual focus in a high-low temperature range of-40 ℃ to +80 ℃.
In the embodiment of the invention, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the seventh lens L7, the eighth lens L8 and the ninth lens L9 are all aspheric lenses, and the fifth lens L5 and the sixth lens L6 are all spherical lenses. In the embodiment of the invention, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the seventh lens L7, the eighth lens L8 and the ninth lens L9 are all plastic lenses, and the fifth lens L5 and the sixth lens L6 are all glass lenses. In the embodiment of the invention, 7 plastic aspheric lenses are adopted and mixed with 2 glass spherical lenses, so that the cost is greatly reduced, and the lower cost is realized while the high resolution is ensured.
In the embodiment of the invention, the effective focal length F of the fixed focus lens meets the following relation: f is more than or equal to 4.5 and less than or equal to 4.8, and has high performance.
In the embodiment of the invention, the following relation is satisfied between the total optical length TTL of the fixed focus lens and the effective focal length F of the fixed focus lens: TTL/F is not less than 4.6 and not more than 4.9. The following relation is satisfied between the optical back Jiao Changdu BFL of the fixed focus lens and the effective focal length F of the fixed focus lens: BFL/F is less than or equal to 0.88 and less than or equal to 0.93. The optical back Jiao Changdu BFL refers to the distance from the image side of the last lens element (i.e., the ninth lens element L9) to the image plane IMA. In the embodiment of the invention, through the optimal configuration of the total optical length TTL and the post-optical Jiao Changdu BFL of the lens, the lens has high imaging performance and simultaneously realizes miniaturization and small volume, and particularly, the lens comprises a flat plate with the total optical length TTL less than or equal to 22.5mm.
In the embodiment of the invention, the FNO number of the fixed focus lens meets the following relation: FNO is more than or equal to 1.0 and less than or equal to 1.07. The numerical range of the FNO number reflects the characteristic of the ultra-large aperture of the fixed focus lens, thereby realizing low-light imaging.
In the embodiment of the present invention, the following relation is satisfied between the effective focal length F1 of the first lens L1 and the effective focal length F of the fixed focus lens: -2.5 < F1/F < 2.1. By setting the focal length relation between the first lens L1 and the lens and the range thereof, the incident light rays of the optical system can be converged, the system light path is controlled, and the volume is further reduced.
In the embodiment of the invention, the following relation is satisfied between the effective focal length F2 of the second lens L2 and the effective focal length F of the fixed focus lens: F2/F is more than or equal to 3.6 and less than or equal to 10.1. The effective focal length F3 of the third lens L3 and the effective focal length F of the fixed focus lens satisfy the following relation: -3.2.ltoreq.F3/F.ltoreq.2.0. By limiting and reasonably collocating the focal length relation of the second lens L2 and the lens and the focal length relation of the third lens L3 and the lens respectively, the aberration generated by light passing through the diaphragm can be balanced.
In the embodiment of the present invention, the following relation is satisfied between the effective focal length F4 of the fourth lens L4 and the effective focal length F of the fixed focus lens: F4/F is less than or equal to 3.4 and less than or equal to 4.4. By setting the focal length relation between the fourth lens L4 and the lens and the range thereof, the high-low temperature performance can be balanced, so that the fixed-focus lens is suitable for different environments with high and low temperatures, and the imaging is clear in the temperature range of-40 ℃ to +80 ℃.
In the embodiment of the invention, the fifth lens L5 and the sixth lens L6 are bonded to form a double-bonded lens with positive focal power. In the embodiment of the present invention, the following relation is satisfied between the combined focal length F56 of the fifth lens L5 and the sixth lens L6 and the effective focal length F of the fixed focus lens: F56/F is less than or equal to 2.2 and less than or equal to 2.6. The combined focal length F56 of the fifth lens L5 and the sixth lens L6 is the focal length of the cemented doublet. The arrangement of the cemented lens and the limitation of the relation between the focal length of the cemented lens and the focal length of the lens can balance imaging chromatic aberration and improve imaging performance.
In the embodiment of the present invention, the following relation is satisfied between the effective focal length F7 of the seventh lens L7 and the effective focal length F of the fixed focus lens: F7/F is less than or equal to 1.5 and less than or equal to 2.0. The effective focal length F8 of the eighth lens L8 and the effective focal length F of the fixed-focus lens satisfy the following relation: -F8/F is less than or equal to 2.0 and less than or equal to-1.4. The effective focal length F9 of the ninth lens L9 and the effective focal length F of the fixed focus lens satisfy the following relation: F9/F is more than or equal to 2.4 and less than or equal to 3.5. By the arrangement and combination collocation, aberration can be controlled, tolerance sensitivity can be reduced, and high-image quality imaging of the fixed focus lens is facilitated.
In the embodiment of the invention, the principal ray CRA value of the fixed focus lens satisfies the following relation: CRA is more than or equal to 12.5 and less than or equal to 16.2. The CRA value of the lens is controlled, so that the lens is favorable for being compatible with chips, can be adapted to multiple sensors, improves market competitiveness, and has wide application prospect.
In summary, the fixed focus lens provided by the embodiment of the invention has ultra-high definition imaging performance with ultra-large aperture and higher resolution up to 6M, simultaneously has low cost and small volume, realizes low-light imaging, can realize ultra-high definition imaging in the temperature range of-40 ℃ to +80 ℃ without virtual focus, and is suitable for different environments with high and low temperatures. Specifically, the fixed focus lens comprises a first lens L1 to a ninth lens L9, a diaphragm STO and a flat plate, wherein the total optical length TTL is less than or equal to 22.5mm, the aperture FNO number epsilon [1.0,1.07], the lens CRA epsilon [12.5, 16.2], and the fixed focus lens can be adapted to a plurality of sensors.
The following describes the fixed focus lens of the present invention in detail with reference to the accompanying drawings and tables by using 4 embodiments. In the following respective embodiments, the present invention refers to the stop STO as one side (S5), the flat plate as two sides (S19 and S20), and the image plane IMA as one side (S21).
The parameters of the various embodiments specifically conforming to the above relationship are shown in table 1 below:
table 1 in an embodiment of the present invention, the plastic aspherical lens of the fixed focus lens satisfies the following formula:
in the above formula, z is the axial distance from the curved surface to the vertex at the position with the height h perpendicular to the optical axis along the optical axis direction; c represents the curvature at the apex of the aspherical curved surface; k is a conic coefficient; a is that 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 The fourth order, sixth order, eighth order, tenth order, fourteenth order, sixteen order, respectively, are aspherical coefficients.
Example 1
Referring to fig. 1, the parameters of the fixed focus lens of the present embodiment are as follows:
and F, NO:1.06; total optical length of lens TTL:22.38mm; focal length: 4.61mm.
Table 2 lists relevant parameters of each lens in the fixed focus lens of this embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
TABLE 2
Table 3 lists the aspherical coefficients of each aspherical lens of the fixed focus lens of the present embodiment, including: the quadric constant K and the fourth-order aspheric coefficient A of the surface 4 Aspheric coefficient A of six orders 6 Eighth order aspheric coefficient A 8 Tenth order aspherical coefficient A 10 Twelve-order aspheric coefficient A 12 Fourteen-order aspheric coefficient A 14 And sixteen order aspheric coefficient A 16 。
TABLE 3 Table 3
Referring to fig. 1 and tables 1 to 3, the fixed focus lens of the present embodiment has ultra-high definition imaging performance with ultra-large aperture and higher resolution up to 6M, and simultaneously has low cost and small volume, realizes low-light imaging, can realize ultra-high definition imaging in a temperature range of-40 ℃ to +80 ℃ without virtual focus, and is suitable for different environments with high and low temperatures.
Example 2
Referring to fig. 2, the parameters of the fixed focus lens of the present embodiment are as follows:
and F, NO:1.06; total optical length of lens TTL:22.42mm; focal length: 4.74mm.
Table 4 lists relevant parameters of each lens in the fixed focus lens of this embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
TABLE 4 Table 4
Table 5 lists the aspherical coefficients of each aspherical lens of the fixed focus lens of the present embodiment, including: the quadric constant K and the fourth-order aspheric coefficient A of the surface 4 Aspheric coefficient A of six orders 6 Eighth order aspheric coefficient A 8 Tenth order aspherical coefficient A 10 Twelve-order aspheric coefficient A 12 Fourteen-order aspheric coefficient A 14 And sixteen order aspheric coefficient A 16 。
TABLE 5
Referring to fig. 2 and tables 1, 4 and 5, the fixed focus lens of the present embodiment has ultra-high definition imaging performance with ultra-large aperture and higher resolution up to 6M, and simultaneously has low cost and small volume, realizes low-light imaging, can realize ultra-high definition imaging in a temperature range of-40 ℃ to +80 ℃ without virtual focus, and is suitable for different environments with high and low temperatures.
Example 3
Referring to fig. 3, the parameters of the fixed focus lens of the present embodiment are as follows:
and F, NO:1.06; total optical length of lens TTL:22.40mm; focal length: 4.79mm.
Table 6 lists relevant parameters of each lens in the fixed focus lens of this embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
| Face number | Surface type | Radius of curvature R | Thickness d | Refractive index Nd | Abbe number Vd |
| S1 | Aspherical surface | 3.75 | 0.98 | 1.54 | 55.7 |
| S2 | Aspherical surface | 2.06 | 2.12 | ||
| S3 | Aspherical surface | -5.71 | 1.10 | 1.64 | 23.5 |
| S4 | Aspherical surface | -4.11 | -0.40 | ||
| S5(STO) | Spherical surface | Infinity | 0.71 | ||
| S6 | Aspherical surface | -39.46 | 1.20 | 1.64 | 23.5 |
| S7 | Aspherical surface | 7.82 | 0.14 | ||
| S8 | Aspherical surface | 24.44 | 2.64 | 1.64 | 23.5 |
| S9 | Aspherical surface | -21.61 | 0.36 | ||
| S10 | Spherical surface | 86.46 | 0.76 | 1.73 | 28.3 |
| S11 | Spherical surface | 7.72 | 2.85 | 1.76 | 52.3 |
| S12 | Spherical surface | -10.34 | 0.08 | ||
| S13 | Aspherical surface | 4.99 | 2.83 | 1.54 | 55.7 |
| S14 | Aspherical surface | -278.96 | 0.25 | ||
| S15 | Aspherical surface | -55.49 | 0.80 | 1.66 | 20.4 |
| S16 | Aspherical surface | 7.05 | 0.20 | ||
| S17 | Aspherical surface | 31.26 | 1.52 | 1.54 | 55.7 |
| S18 | Aspherical surface | -7.98 | 3.27 | ||
| S19 | Spherical surface | Infinity | 0.85 | 1.52 | 64.2 |
| S20 | Spherical surface | Infinity | 0.15 | ||
| S21(IMA) | Spherical surface | Infinity | - | - | - |
TABLE 6
Table 7 lists the aspherical coefficients of each aspherical lens of the fixed focus lens of the present embodiment, including: the quadric constant K and the fourth-order aspheric coefficient A of the surface 4 Aspheric coefficient A of six orders 6 Eighth order aspheric coefficient A 8 Tenth order aspherical coefficient A 10 Twelve-order aspheric coefficient A 12 Fourteen-order aspheric coefficient A 14 And sixteen order aspheric coefficient A 16 。
TABLE 7
Referring to fig. 3 and tables 1, 6 and 7, the fixed focus lens of the present embodiment has ultra-high definition imaging performance with ultra-large aperture and higher resolution up to 6M, and simultaneously has low cost and small volume, realizes low-light imaging, can realize ultra-high definition imaging in a temperature range of-40 ℃ to +80 ℃ without virtual focus, and is suitable for different environments with high and low temperatures.
Example 4
Referring to fig. 4, the parameters of the fixed focus lens of the present embodiment are as follows:
and F, NO:1.03; total optical length of lens TTL:22.42mm; focal length: 4.78mm.
Table 8 lists relevant parameters of each lens in the fixed focus lens of this embodiment, including: surface type, radius of curvature, thickness, refractive index of the material, and abbe number.
| Face number | Surface type | Radius of curvature R | Thickness d | Refractive index Nd | Abbe number Vd |
| S1 | Aspherical surface | 3.58 | 0.81 | 1.54 | 55.7 |
| S2 | Aspherical surface | 2.09 | 2.48 | ||
| S3 | Aspherical surface | -4.97 | 0.96 | 1.64 | 23.5 |
| S4 | Aspherical surface | -4.59 | -0.33 | ||
| S5(STO) | Spherical surface | Infinity | 0.70 | ||
| S6 | Aspherical surface | -89.19 | 1.24 | 1.64 | 23.5 |
| S7 | Aspherical surface | 10.78 | 0.13 | ||
| S8 | Aspherical surface | 25.06 | 3.34 | 1.64 | 23.5 |
| S9 | Aspherical surface | -17.84 | 0.08 | ||
| S10 | Spherical surface | 70.15 | 0.61 | 1.73 | 28.3 |
| S11 | Spherical surface | 8.21 | 3.16 | 1.76 | 52.3 |
| S12 | Spherical surface | -9.56 | 0.08 | ||
| S13 | Aspherical surface | 4.57 | 2.39 | 1.54 | 55.7 |
| S14 | Aspherical surface | -47.40 | 0.13 | ||
| S15 | Aspherical surface | -33.04 | 0.58 | 1.66 | 20.4 |
| S16 | Aspherical surface | 5.50 | 0.38 | ||
| S17 | Aspherical surface | 57.93 | 1.31 | 1.54 | 55.7 |
| S18 | Aspherical surface | -10.40 | 3.40 | ||
| S19 | Spherical surface | Infinity | 0.85 | 1.52 | 64.2 |
| S20 | Spherical surface | Infinity | 0.15 | ||
| S21(IMA) | Spherical surface | Infinity | - | - | - |
TABLE 8
Table 9 lists the aspherical coefficients of each aspherical lens of the fixed focus lens of the present embodiment, including: the method comprisesSurface quadric constant K, fourth order aspheric coefficient A 4 Aspheric coefficient A of six orders 6 Eighth order aspheric coefficient A 8 Tenth order aspherical coefficient A 10 Twelve-order aspheric coefficient A 12 Fourteen-order aspheric coefficient A 14 And sixteen order aspheric coefficient A 16 。
TABLE 9
Referring to fig. 4 and tables 1, 8 and 9, the fixed focus lens of the present embodiment has ultra-high definition imaging performance with ultra-large aperture and higher resolution up to 6M, and simultaneously has low cost and small volume, realizes low-light imaging, can realize ultra-high definition imaging in a temperature range of-40 ℃ to +80 ℃ without virtual focus, and is suitable for different environments with high and low temperatures.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (16)
1. A fixed focus lens, which sequentially comprises a first lens (L1) with negative focal power, a second lens (L2) with positive focal power, a third lens (L3) with negative focal power, a fourth lens (L4) with positive focal power, a fifth lens (L5) with negative focal power, a sixth lens (L6) with positive focal power, a seventh lens (L7) with positive focal power, an eighth lens (L8) with negative focal power, a ninth lens (L9) with positive focal power and a flat plate along the direction from an object side to an image side, wherein the second lens (L2) is a concave lens in a paraxial region, the third lens (L3) is a concave lens in a paraxial region, and the fixed focus lens further comprises a diaphragm (STO),
the diaphragm (STO) is located between the second lens (L2) and the third lens (L3);
the seventh lens (L7) is a paraxial region convex lens;
the eighth lens (L8) is a paraxial region concave lens;
the effective focal length F1 of the first lens (L1) and the effective focal length F of the fixed focus lens satisfy the following relation: -F1/F is less than or equal to 2.5 and less than or equal to-2.1;
the effective focal length F4 of the fourth lens (L4) and the effective focal length F of the fixed focus lens satisfy the following relation: F4/F is less than or equal to 3.4 and less than or equal to 4.4.
2. The fixed focus lens of claim 1, wherein, in a direction from an object side to an image side along an optical axis,
the first lens (L1) is a paraxial region convex-concave lens;
the fourth lens (L4) and the ninth lens (L9) are paraxial region convex lenses;
the fifth lens (L5) is a convex-concave lens;
the sixth lens (L6) is a convex lens.
3. The fixed focus lens according to claim 1, wherein the first lens (L1), the second lens (L2), the third lens (L3), the fourth lens (L4), the seventh lens (L7), the eighth lens (L8) and the ninth lens (L9) are aspherical lenses;
the fifth lens (L5) and the sixth lens (L6) are spherical lenses.
4. The fixed focus lens of claim 1, wherein the first lens (L1), the second lens (L2), the third lens (L3), the fourth lens (L4), the seventh lens (L7), the eighth lens (L8) and the ninth lens (L9) are plastic lenses;
the fifth lens (L5) and the sixth lens (L6) are both glass lenses.
5. The fixed focus lens of any one of claims 1 to 4, wherein the effective focal length F of the fixed focus lens satisfies the following relation: f is more than or equal to 4.5 and less than or equal to 4.8.
6. The fixed focus lens of any one of claims 1 to 4, wherein the total optical length TTL of the fixed focus lens and the effective focal length F of the fixed focus lens satisfy the following relation: TTL/F is not less than 4.6 and not more than 4.9.
7. The fixed focus lens of any one of claims 1 to 4, wherein the optical back Jiao Changdu BFL of the fixed focus lens and the effective focal length F of the fixed focus lens satisfy the following relationship: BFL/F is less than or equal to 0.88 and less than or equal to 0.93.
8. The fixed focus lens of any one of claims 1 to 4, wherein the FNO number of the fixed focus lens satisfies the following relation: FNO is more than or equal to 1.0 and less than or equal to 1.07.
9. The fixed focus lens according to any one of claims 1 to 4, characterized in that the effective focal length F2 of the second lens (L2) and the effective focal length F of the fixed focus lens satisfy the following relation: F2/F is more than or equal to 3.6 and less than or equal to 10.1.
10. The fixed focus lens according to any one of claims 1 to 4, characterized in that the effective focal length F3 of the third lens (L3) and the effective focal length F of the fixed focus lens satisfy the following relation: -3.2.ltoreq.F3/F.ltoreq.2.0.
11. The fixed focus lens according to any one of claims 1 to 4, wherein the fifth lens (L5) and the sixth lens (L6) are cemented together to form a cemented doublet having positive optical power.
12. The fixed focus lens according to any one of claims 1 to 4, characterized in that a combined focal length F56 of the fifth lens (L5) and the sixth lens (L6) and an effective focal length F of the fixed focus lens satisfy the following relation: F56/F is less than or equal to 2.2 and less than or equal to 2.6.
13. The fixed focus lens according to any one of claims 1 to 4, characterized in that the effective focal length F7 of the seventh lens (L7) and the effective focal length F of the fixed focus lens satisfy the following relation: F7/F is less than or equal to 1.5 and less than or equal to 2.0.
14. The fixed focus lens according to any one of claims 1 to 4, characterized in that the effective focal length F8 of the eighth lens (L8) and the effective focal length F of the fixed focus lens satisfy the following relation: -F8/F is less than or equal to 2.0 and less than or equal to-1.4.
15. The fixed focus lens according to any one of claims 1 to 4, characterized in that the effective focal length F9 of the ninth lens (L9) and the effective focal length F of the fixed focus lens satisfy the following relation: F9/F is more than or equal to 2.4 and less than or equal to 3.5.
16. The fixed focus lens of any one of claims 1 to 4, wherein a chief ray CRA value of the fixed focus lens satisfies the following relation: CRA is more than or equal to 12.5 and less than or equal to 16.2.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5724192A (en) * | 1994-09-26 | 1998-03-03 | Samsung Aerospace Industries, Ltd. | Wide-angle zoom lens |
| CN109116532A (en) * | 2018-10-17 | 2019-01-01 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN114460719A (en) * | 2022-02-22 | 2022-05-10 | 舜宇光学(中山)有限公司 | Fixed focus lens |
| CN217587747U (en) * | 2022-07-20 | 2022-10-14 | 舜宇光学(中山)有限公司 | Fixed focus lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US10884224B2 (en) * | 2016-12-28 | 2021-01-05 | Panasonic Intellectual Property Management Co., Ltd. | Imaging optical system, and imaging device and camera system provided with imaging optical system |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5724192A (en) * | 1994-09-26 | 1998-03-03 | Samsung Aerospace Industries, Ltd. | Wide-angle zoom lens |
| CN109116532A (en) * | 2018-10-17 | 2019-01-01 | 舜宇光学(中山)有限公司 | Zoom lens |
| CN114460719A (en) * | 2022-02-22 | 2022-05-10 | 舜宇光学(中山)有限公司 | Fixed focus lens |
| CN217587747U (en) * | 2022-07-20 | 2022-10-14 | 舜宇光学(中山)有限公司 | Fixed focus lens |
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