CN115480378A - Fixed focus lens - Google Patents

Fixed focus lens Download PDF

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Publication number
CN115480378A
CN115480378A CN202211177362.9A CN202211177362A CN115480378A CN 115480378 A CN115480378 A CN 115480378A CN 202211177362 A CN202211177362 A CN 202211177362A CN 115480378 A CN115480378 A CN 115480378A
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China
Prior art keywords
lens
prime
convex
fixed focus
fixed
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Chinese (zh)
Inventor
翟林燕
梁伟朝
应永茂
陶雪
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Sunny Optics Zhongshan Co Ltd
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Sunny Optics Zhongshan Co Ltd
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Priority to CN202211177362.9A priority Critical patent/CN115480378A/en
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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
    • 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
    • G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The invention relates to a fixed focus lens, which sequentially comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens and flat glass along the direction from an object side to an image side along an optical axis, wherein the first lens is a paraxial region convex-concave lens with negative focal power, the second lens is a paraxial region convex-concave lens with positive focal power, the third lens is a convex-convex lens with positive focal power, the fourth lens is a paraxial region concave-concave lens with negative focal power, the fifth lens is a paraxial region convex-convex aspheric lens with positive focal power, and the 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 2.60 and less than or equal to 2.90. The chromatic aberration can be corrected by reasonably configuring the focal power, the shape and the optical parameters of the lens, the large aperture, the high pixel, the small volume and the low cost of the prime lens can be ensured, the false focus can not occur in the temperature range of-40 ℃ to 80 ℃, and the dual-purpose infrared and day and night are also considered.

Description

Fixed focus lens
Technical Field
The invention relates to the field of optical lenses, in particular to a fixed focus lens.
Background
With the rapid development of the camera lens market, the requirements of customers on the performance of the lens are continuously increased, the current market lacks a relatively small size, clear imaging is guaranteed, a thermal and day and night confocal security lens is avoided, the performance of the lens can be improved by adopting a scheme of more lenses, the cost is increased or the size is increased, and the cost and the performance are difficult to balance.
Disclosure of Invention
In view of the above, the present invention is directed to a fixed focus lens, which ensures that the fixed focus lens has a large aperture, high pixels, a small volume, a low cost, no virtual focus within a temperature range of-40 ℃ to 80 ℃, and both infrared and day and night functions.
The present invention provides a fixed focus lens, sequentially including, in a direction from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens and a flat glass, wherein the first lens is a paraxial region convex-concave lens having a negative refractive power, the second lens is a paraxial region convex-concave lens having a positive refractive power, the third lens is a convex-convex lens having a positive refractive power, the fourth lens is a paraxial region concave-concave lens having a negative refractive power, the fifth lens is a paraxial region convex-convex aspheric lens having a positive refractive power, and a focal length F2 of the second lens and an effective focal length F of the fixed focus lens satisfy the following relationship: F2/F is more than or equal to 2.60 and less than or equal to 2.90.
Preferably, the first lens, the second lens, the fourth lens and the fifth lens are plastic lenses.
Preferably, the first lens, the second lens and the fourth lens are aspheric lenses, and the third lens is a spherical lens.
Preferably, the following relationship is satisfied between the image side SAG2 of the first lens and the effective focal length F of the prime lens:
0.15≤SAG2/F≤0.20。
preferably, the effective focal length F345 of the rear group lens group formed by the third lens, the fourth lens and the fifth lens and the effective focal length F of the fixed-focus lens satisfy the following relationship:
1.30≤F345/F≤1.50。
preferably, the object side SAGs 8 of the fourth lens and the object side aperture D8 of the fourth lens satisfy the following relationship:
0.10≤|SAG8/D8|≤0.20。
preferably, the object side aperture D1 of the first lens element and the total optical length TTL of the fixed focus lens satisfy the following relationship:
0.20≤D1/TTL≤0.40。
preferably, a distance BFL from an image-side surface of the fifth lens element to an image plane and a half-image height h of the fixed-focus lens satisfy the following relation:
2.10≤BFL/h≤2.20。
preferably, the distance TSI from the diaphragm to the image plane and the total optical length TTL of the fixed focus lens satisfy the following relationship:
0.40≤TSI/TTL≤0.60。
preferably, 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:
3.30≤TTL/F≤3.60。
preferably, a distance BFL from an image side surface of the fifth lens element to the image plane and the total optical length TTL of the lens satisfy a relation:
0.30≤BFL/TTL≤0.35。
preferably, a temperature coefficient dn/dt of a relative refractive index of at least one of the third lens, the fourth lens and the fifth lens satisfies the following relation:
dn/dt≤3×10-6/℃。
preferably, at least one of the first lens, the second lens, the third lens, the fourth lens and the fifth lens is a low-dispersion glass lens, and an abbe number VD of the low-dispersion glass lens satisfies the following relation:
VD≥60。
according to at least one scheme of the invention, the fixed-focus lens can realize Fno less than 1.66, and has large aperture, small volume and high pixel;
according to at least one scheme of the invention, the fixed-focus lens enables aberration to be effectively corrected by optimally configuring the positive and negative focal powers and the shapes of all lenses, so that the performance of an optical system is further improved;
according to at least one scheme of the invention, the fixed-focus lens can realize no virtual focus in the temperature range of-40-80 ℃, and has confocal effects of visible light and infrared light;
according to at least one scheme of the invention, the caliber of the object side surface of the first lens is less than or equal to 7.50mm, so that the small volume of the prime lens is ensured;
according to at least one scheme of the invention, the total length of the fixed-focus lens is less than or equal to 22.21mm (including flat glass), so that the small volume of the fixed-focus lens is ensured;
according to at least one scheme of the invention, through reasonably arranging each lens, the single-part fixed-focus lens and the assembly tolerance are better, and the manufacturing performance is good.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic view of an optical structure of a fixed focus lens according to a first embodiment of the present invention;
fig. 2 is a schematic view of a visible MTF of a fixed-focus lens according to a first embodiment of the present disclosure;
fig. 3 is a schematic infrared MTF diagram of a fixed-focus lens according to a first embodiment of the present disclosure;
fig. 4 is a schematic MTF diagram of a fixed-focus lens according to a first embodiment of the present invention at a high temperature of 80 ℃;
fig. 5 is a schematic MTF diagram of a fixed-focus lens at a low temperature of-40 ℃ according to a first embodiment of the present invention;
fig. 6 is an optical structure diagram of a fixed-focus lens according to a second embodiment of the present invention;
fig. 7 is a schematic view of a visible MTF of a fixed-focus lens according to a second embodiment of the present invention;
fig. 8 is an infrared MTF schematic diagram of a fixed-focus lens according to a second embodiment of the present invention;
fig. 9 is a schematic MTF diagram of a fixed-focus lens according to a second embodiment of the present invention at a high temperature of 80 ℃;
fig. 10 is a schematic MTF at-40 ℃ of a fixed-focus lens according to a second embodiment of the present invention;
fig. 11 is an optical structure diagram of a fixed-focus lens according to a third embodiment of the present invention;
fig. 12 is a schematic view of a visible MTF of a fixed-focus lens according to a third embodiment of the present invention;
fig. 13 is an infrared MTF schematic diagram of a fixed-focus lens according to a third embodiment of the present invention;
fig. 14 is a schematic MTF diagram of a fixed-focus lens according to a third embodiment of the present invention at a high temperature of 80 ℃;
fig. 15 is a schematic MTF at-40 ℃ of a prime lens according to a third embodiment of the present invention;
fig. 16 is an optical structure diagram of a fixed-focus lens according to a fourth embodiment of the present invention;
fig. 17 is a schematic view of a visible MTF of a fixed-focus lens according to a fourth embodiment of the present invention;
fig. 18 is an infrared MTF schematic diagram of a fixed-focus lens according to a fourth embodiment of the present invention;
fig. 19 is a schematic MTF diagram of a fixed-focus lens according to a fourth embodiment of the present invention at a high temperature of 80 ℃;
fig. 20 is a schematic MTF at-40 ℃ of a fixed-focus lens according to a fourth embodiment of the present invention.
Detailed Description
The description of the embodiments of this specification should be taken in conjunction with the accompanying drawings, which are to be considered part of the entire written description. In the drawings, the shape or thickness of the embodiments may be exaggerated and simplified or conveniently indicated. Further, the components of the structures in the drawings are described separately, and it should be noted that the components not shown or described in the drawings are well known to those skilled in the art.
Any reference to directions and orientations to the description of the embodiments herein is merely for convenience of description and should not be construed as limiting the scope of the invention in any way. The following description of the preferred embodiments refers to combinations of features which may be present independently or in combination, and the present invention is not particularly limited to the preferred embodiments. The scope of the invention is defined by the claims.
As shown in fig. 1 to 20, the fixed focus lens according to the embodiment of the present invention includes, in order from an object side to an IMAGE side along an optical axis, a first lens L1, a second lens L2, a third lens L3, a STOP, a fourth lens L4, a fifth lens L5, a plate glass CG, and an IMAGE plane IMAGE, wherein the first lens L1 is a paraxial region convex-concave lens having a negative refractive power, the second lens L2 is a paraxial region convex-concave lens having a positive refractive power, the third lens L3 is a convex-convex lens having a positive refractive power, the fourth lens L4 is a paraxial region concave-concave lens having a negative refractive power, and the fifth lens L5 is a paraxial region convex-aspheric lens having a positive refractive power, and a relationship between a focal length F2 of the second lens L2 and an effective focal length F of the fixed focus lens is satisfied: F2/F is more than or equal to 2.60 and less than or equal to 2.90. By reasonably configuring the focal power, the shape and the optical parameters of the lens, the chromatic aberration is favorably corrected, the large aperture, the high pixel, the small volume and the low cost of the prime lens can be ensured, virtual focus is not generated in the temperature range of minus 40-80 ℃, and the dual purposes of infrared and day and night are also considered.
In at least one preferred embodiment of the present invention, the first lens L1, the second lens L2, the fourth lens L4 and the fifth lens L5 are all plastic aspheric lenses, and the third lens L3 is a glass spherical lens. Therefore, high and low temperature imaging is corrected while cost is reduced.
In at least one preferred embodiment of the present invention, the following relationship is satisfied between the image-side SAG2 of the first lens L1 and the effective focal length F of the prime lens: SAG2/F is more than or equal to 0.15 and less than or equal to 0.20. Therefore, the method is beneficial to the incident light to stably enter the optical system, and the sensitivity of the system is reduced while the image height is ensured.
In at least one preferred embodiment of the present invention, the effective focal length F345 of the rear group lens group composed of the third lens L3, the fourth lens L4, and the fifth lens L5 and the effective focal length F of the prime lens satisfy the following relationship: F345/F is more than or equal to 1.30 and less than or equal to 1.50. Therefore, through reasonable collocation of the lenses, the chromatic aberration of the optical system can be corrected, and higher image quality can be realized.
In at least one preferred embodiment of the present invention, the object-side SAGs 8 of the fourth lens L4 and the object-side aperture D8 of the fourth lens L4 satisfy the following relationship: the ratio of SAG8/D8 is more than or equal to 0.10 and less than or equal to 0.20. Therefore, the sensitivity of the fixed-focus lens is favorably reduced, and the imaging quality of the lens is improved.
In at least one preferred embodiment of the present invention, the object side aperture D1 of the first lens L1 and the total optical length TTL of the fixed focus lens satisfy the following relationship: D1/TTL is more than or equal to 0.20 and less than or equal to 0.40. Therefore, the method is beneficial to realizing higher image quality and ensuring smaller volume.
In at least one preferred embodiment of the present invention, a distance BFL from the IMAGE side of the fifth lens L5 to the IMAGE plane IMAGE and a half-IMAGE height h of the fixed-focus lens satisfy the following relationship: BFL/h is more than or equal to 2.10 and less than or equal to 2.20. Therefore, the method is beneficial to realizing higher image quality and ensuring smaller volume.
In at least one preferred embodiment of the present invention, the distance TSI from the stop STO to the IMAGE plane IMAGE and the total optical length TTL of the fixed focus lens satisfy the following relationship: TSI/TTL is more than or equal to 0.40 and less than or equal to 0.60. Therefore, the method is beneficial to realizing higher image quality and ensuring smaller volume.
In at least one preferred embodiment of the present invention, 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 more than or equal to 3.30 and less than or equal to 3.60. Therefore, the method is beneficial to realizing higher image quality and ensuring smaller volume.
In at least one preferred embodiment of the present invention, the distance BFL from the IMAGE side surface of the fifth lens L5 to the IMAGE plane IMAGE and the total optical length TTL of the fixed-focus lens satisfy the following relational expression: BFL/TTL is more than or equal to 0.30 and less than or equal to 0.35. Therefore, the lens is beneficial to realizing smaller volume and simultaneously ensuring the size of the chief ray angle of the lens, so that the chief ray angle of the lens is better matched with a chip.
In at least one preferred embodiment of the present invention, the temperature coefficient of relative refractive index dn/dt of at least one of the third lens L3, the fourth lens L4, and the fifth lens L5 satisfies the following relation: dn/dt is less than or equal to 3 multiplied by 10 < -6 >/DEG C. Therefore, the method is favorable for realizing that the fixed-focus lens does not have virtual focus within the temperature range of minus 40 ℃ to 80 ℃.
In at least one preferred embodiment of the present invention, at least one of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 is a low dispersion glass, and the abbe number VD of the low dispersion glass satisfies the following relation: VD is more than or equal to 60. Thereby, it is advantageous to realize day and night confocal.
The fixed-focus lens provided by the embodiment of the invention has the following beneficial effects: (1) the fixed focus lens can realize that Fno is less than or equal to 1.66, the aperture is large, the volume is small, and the pixels are high; (2) the fixed-focus lens enables aberration to be effectively corrected by optimally configuring the positive and negative focal powers and the shapes of all lenses, and the performance of an optical system is further improved; (3) the fixed-focus lens can realize no virtual focus in the temperature range of-40 ℃ to 80 ℃ and also realize confocal of visible light and infrared light; (4) the aperture of the object side surface of the first lens L1 is less than or equal to 7.50mm, so that the small size of the prime lens is ensured; (5) the total length of the fixed-focus lens is less than or equal to 22.21mm (including flat glass), so that the small volume of the fixed-focus lens is ensured; (6) by reasonably arranging the lenses, the single-part fixed-focus lens has better assembly tolerance and good manufacturability.
The following describes four embodiments of the fixed focus lens of the present invention with reference to the drawings and tables. In the following embodiments, the STOP is described as one surface, and the IMAGE plane is described as one surface.
The parameters of each example specifically satisfying the above conditional expressions are shown in table 1 below:
conditional formula (VII) Example one Example two EXAMPLE III Example four
0.15≤SAG2/F≤0.20 0.17 0.18 0.18 0.17
2.60≤F2/F≤2.90 2.71 2.77 2.80 2.70
1.30≤F345/F≤1.50 1.43 1.41 1.38 1.43
0.10≤|SAG8/D8|≤0.20 0.12 0.15 0.14 0.12
0.20≤D1/TTL≤0.40 0.32 0.33 0.33 0.30
2.10≤BFL/h≤2.20 2.14 2.18 2.14 2.15
0.40≤TSI/TTL≤0.60 0.53 0.52 0.50 0.53
3.30≤TTL/F≤3.60 3.40 3.46 3.53 3.42
0.30≤BFL/TTL≤0.35 0.32 0.33 0.32 0.32
Table 1 in the embodiment of the present invention, the aspherical lens of the fixed-focus lens satisfies the following formula:
Figure BDA0003865135130000071
in the above formula, z is the axial distance from the curved surface to the vertex at the position of the height y perpendicular to the optical axis along the optical axis direction; c represents the curvature at the apex of the aspherical surface; k is a conic coefficient; a. The 4 、A 6 、A 8 、A 10 、A 12 、A 14 、A 16 The aspherical coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth and sixteenth orders are expressed respectively.
Example one
As shown in fig. 1 to 5, in the first embodiment, fno of the fixed-focus lens is 1.65, the total lens length is 22.095mm, the viewing angle is 60.85 °, and the curvature radius R, the thickness d, the refractive index Nd, and the abbe number Vd of each surface of the fixed-focus lens are shown in the following table (table 2):
noodle sequence number Surface type Radius of curvature R Thickness d Refractive index Nd Abbe number Vd
S1 Aspherical surface 4.051 1.525 1.54 55.7
S2 Aspherical surface 2.210 2.791
S3 Aspherical surface -7.942 3.289 1.64 23.4
S4 Aspherical surface -5.445 0.070
S5 Spherical surface 5.942 2.660 1.46 90.2
S6 Spherical surface -8.302 -0.166
S7(Stop) Spherical surface Infinity 0.938
S8 Aspherical surface -5.588 0.721 1.61 25.6
S9 Aspherical surface 4.182 0.625
S10 Aspherical surface 4.308 2.566 1.54 55.7
S11 Aspherical surface -5.027 6.076
S12 Spherical surface Infinity 0.800 1.52 64.2
S13 Spherical surface Infinity 0.200
S14(IMAGE) Spherical surface Infinity -
TABLE 2
In the first embodiment, the K value and aspheric coefficient of the fixed-focus lens are shown in the following table (table 3):
Figure BDA0003865135130000072
Figure BDA0003865135130000081
TABLE 3
As shown in fig. 1-5 and tables 1-3, the present embodiment is advantageous to correct chromatic aberration by reasonably configuring the focal power, shape and optical parameters of the lens, and can ensure that the fixed-focus lens has a large aperture, high pixels, a small volume, low cost, no virtual focus within a temperature range of-40 ℃ to 80 ℃, and both infrared and day and night use.
Example two
As shown in fig. 6 to 10, in the second embodiment, fno of the fixed focus lens is 1.65, the total lens length is 22.100mm, the viewing angle is 61.32 °, and the curvature radius R, the thickness d, the refractive index Nd, and the abbe number Vd of each surface of the fixed focus lens are shown in the following table (table 4):
number of noodles Surface type Radius of curvature R Thickness d Refractive index Nd Abbe number Vd
S1 Aspherical surface 4.202 1.793 1.54 55.7
S2 Aspherical surface 2.210 2.791
S3 Aspherical surface -7.942 3.289 1.64 23.5
S4 Aspherical surface -5.445 0.070
S5 Spherical surface 5.942 2.660 1.46 90.2
S6 Spherical surface -8.302 -0.166
S7(STO) Spherical surface Infinity 0.938
S8 Aspherical surface -3.575 0.800 1.64 23.5
S9 Aspherical surface 12.332 0.666
S10 Aspherical surface 5.446 2.055 1.54 55.7
S11 Aspherical surface -4.859 6.204
S12 Spherical surface Infinity 0.800 1.52 64.2
S13 Spherical surface Infinity 0.200
S14(IMA) Spherical surface Infinity -
TABLE 4
In the second embodiment, the K value and the aspheric coefficient of the fixed focus lens are shown in the following table (table 5):
number of noodles Value of K A4 A6 A8 A10 A12 A14 A16
S1 -3.60 2.27E-003 -4.15E-004 5.37E-006 7.59E-007 -3.37E-008 3.41E-011 1.41E-014
S2 -0.51 -6.77E-003 -1.00E-003 -7.22E-005 4.28E-006 -5.90E-007 -1.95E-009 -9.14E-011
S3 2.79 1.32E-003 -1.14E-004 -1.15E-004 1.65E-005 -2.42E-006 0.00E+000 0.00E+000
S4 0.92 2.07E-003 -7.37E-005 -1.98E-005 3.22E-006 -1.71E-007 0.00E+000 0.00E+000
S8 0.30 8.87E-003 -5.05E-004 -5.92E-005 3.48E-005 -2.78E-006 -9.36E-011 4.37E-010
S9 -0.80 -9.38E-003 2.56E-003 -5.87E-004 9.38E-005 5.69E-006 -1.37E-009 -5.79E-010
S10 -4.44 -9.83E-003 1.81E-003 -2.77E-004 3.79E-005 -1.67E-006 -7.89E-012 1.88E-012
S11 -1.08 1.02E-003 -8.25E-004 2.56E-004 -3.76E-005 2.63E-006 -2.30E-011 1.10E-011
TABLE 5
As shown in fig. 6-10 and tables 1 and 4-5, the present embodiment is advantageous to correct chromatic aberration by reasonably configuring the focal power, shape and optical parameters of the lens, and can ensure that the fixed-focus lens has a large aperture, high pixels, a small volume, low cost, no virtual focus within a temperature range of-40 ℃ to 80 ℃, and both infrared and day and night functions.
EXAMPLE III
As shown in fig. 11 to 15, in the third embodiment, fno of the fixed focus lens is 1.65, the total lens length is 22.122mm, the viewing angle is 66.32 °, and the curvature radius R, the thickness d, the refractive index Nd, and the abbe number Vd of each surface of the fixed focus lens are shown in the following table (table 6):
number of noodles Surface type Radius of curvature R Thickness d Refractive index Nd Abbe number Vd
S1 Aspherical surface 4.355 2.068 1.54 55.7
S2 Aspherical surface 2.183 2.702
S3 Aspherical surface -7.948 3.299 1.64 22.4
S4 Aspherical surface -5.443 0.300
S5 Spherical surface 5.951 2.582 1.46 90.2
S6 Spherical surface -8.338 0.138
S7(STO) Spherical surface Infinity 0.596
S8 Aspherical surface -3.664 0.659 1.64 23.5
S9 Aspherical surface 11.397 0.612
S10 Aspherical surface 5.012 2.090 1.54 55.7
S11 Aspherical surface -4.927 6.076
S12 Spherical surface Infinity 0.800 1.52 64.2
S13 Spherical surface Infinity 0.200
S14(IMA) Spherical surface Infinity -
Table 6 in the third embodiment, the K value and aspheric coefficient of the prime lens are shown in the following table (table 7):
number of noodles Value of K A4 A6 A8 A10 A12 A14
S1 -3.71 1.73E-003 -3.88E-004 5.93E-006 6.12E-007 -2.36E-008 0.00E+000
S2 -0.53 -8.41E-003 -9.98E-004 -7.65E-005 8.10E-006 -8.63E-007 0.00E+000
S3 3.14 1.32E-003 -1.14E-004 -1.15E-004 1.65E-005 -2.42E-006 0.00E+000
S4 0.93 2.07E-003 -7.37E-005 -1.98E-005 3.22E-006 -1.71E-007 0.00E+000
S8 0.27 9.52E-003 -6.87E-004 -7.41E-005 3.75E-005 -3.07E-006 0.00E+000
S9 2.70 -9.11E-003 2.59E-003 -5.82E-004 9.33E-005 -6.05E-006 0.00E+000
S10 -5.55 -9.56E-003 1.98E-003 -2.74E-004 3.62E-005 -1.63E-006 0.00E+000
S11 -0.78 6.75E-004 -7.28E-004 2.47E-004 -3.67E-005 2.72E-006 0.00E+000
TABLE 7
With reference to fig. 11-15 and tables 1 and 6-7, the present embodiment is advantageous to correct chromatic aberration by reasonably configuring the focal power, shape and optical parameters of the lens, and can ensure that the fixed-focus lens has a large aperture, high pixels, a small volume, low cost, no virtual focus within a temperature range of-40 ℃ to 80 ℃, and both infrared and day and night functions.
Example four
As shown in fig. 16 to 20, in example four, fno of the fixed focus lens was 1.65, the total lens length was 22.201mm, the field angle was 60.68 °, and the curvature radius R, thickness d, refractive index Nd, and abbe number Vd of each surface of the fixed focus lens were as shown in the following table (table 8):
Figure BDA0003865135130000101
Figure BDA0003865135130000111
table 8 in the fourth embodiment, the K value and aspheric coefficient of the fixed-focus lens are shown in the following table (table 9):
number of noodles Value of K A4 A6 A8 A10 A12 A14
S1 -3.02 1.02E-003 -4.28E-004 7.24E-006 7.08E-007 -3.41E-008 0.00E+000
S2 -0.48 -8.29E-003 -1.04E-003 -9.15E-005 8.82E-006 -1.01E-006 0.00E+000
S3 2.79 1.33E-003 -1.13E-004 -1.15E-004 1.63E-005 -2.39E-006 0.00E+000
S4 0.92 2.07E-003 -7.31E-005 -1.98E-005 3.22E-006 -1.71E-007 0.00E+000
S8 0.28 -2.18E-003 -3.60E-004 1.05E-004 -5.20E-006 -4.47E-007 0.00E+000
S9 -0.27 -1.34E-002 1.16E-003 -7.87E-005 1.11E-005 -1.27E-006 0.00E+000
S10 0.22 -7.21E-003 5.88E-004 -3.04E-005 4.56E-006 -2.61E-007 0.00E+000
S11 -0.54 2.00E-003 1.22E-004 1.08E-005 -8.38E-007 4.26E-007 0.00E+000
TABLE 9
As shown in fig. 16-20 and tables 1 and 8-9, the present embodiment is advantageous to correct chromatic aberration by reasonably configuring the focal power, shape and optical parameters of the lens, and can ensure that the fixed-focus lens has a large aperture, high pixels, a small volume, low cost, no virtual focus within a temperature range of-40 ℃ to 80 ℃, and both infrared and day and night functions.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (13)

1. A prime lens, which comprises a first lens (L1), a second lens (L2), a third lens (L3), a STOP (STOP), a fourth lens (L4), a fifth lens (L5) and a flat glass (CG) in sequence along an optical axis from an object side to an image side, is characterized in that,
the first lens (L1) is a paraxial region convex-concave lens having a negative power, the second lens (L2) is a paraxial region convex-concave lens having a positive power, the third lens (L3) is a convex-convex lens having a positive power, the fourth lens (L4) is a paraxial region concave-concave lens having a negative power, the fifth lens (L5) is a paraxial region convex-convex aspherical lens having a positive power,
the 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 2.60 and less than or equal to 2.90.
2. The prime lens according to claim 1, wherein the first lens (L1), the second lens (L2), the fourth lens (L4) and the fifth lens (L5) are plastic lenses.
3. The fixed focus lens according to claim 1, wherein the first lens (L1), the second lens (L2), and the fourth lens (L4) are aspherical lenses, and the third lens (L3) is a spherical lens.
4. A prime lens according to any one of claims 1 to 3, wherein the following relationship is satisfied between the image side SAGs 2 of the first lens (L1) and the effective focal length F of the prime lens:
0.15≤SAG2/F≤0.20。
5. a prime lens according to any one of claims 1 to 3, wherein the effective focal length F345 of the rear group lens group formed by the third lens (L3), the fourth lens (L4) and the fifth lens (L5) and the effective focal length F of the prime lens satisfy the following relationship:
1.30≤F345/F≤1.50。
6. the prime lens according to any one of claims 1 to 3, wherein the object side SAGs 8 of the fourth lens (L4) and the object side aperture D8 of the fourth lens (L4) satisfy the following relationship:
0.10≤|SAG8/D8|≤0.20。
7. a prime lens according to any one of claims 1 to 3, wherein the object side aperture D1 of the first lens element (L1) and the total optical length TTL of the prime lens satisfy the following relationship:
0.20≤D1/TTL≤0.40。
8. a fixed focus lens according to any of claims 1 to 3, wherein the distance BFL from the IMAGE side surface of the fifth lens (L5) to the IMAGE plane (IMAGE) and the half-IMAGE height h of the fixed focus lens satisfy the following relation:
2.10≤BFL/h≤2.20。
9. a fixed focus lens as claimed in any one of claims 1 to 3, characterized in that the distance TSI from the Stop (STO) to the IMAGE plane (IMAGE) and the total optical length TTL of the fixed focus lens satisfy the following relation:
0.40≤TSI/TTL≤0.60。
10. a fixed focus lens as claimed in any one of claims 1 to 3, wherein the total optical length TTL of the fixed focus lens and the effective focal length F of the fixed focus lens satisfy the relation:
3.30≤TTL/F≤3.60。
11. a fixed focus lens according to any of claims 1 to 3, wherein a distance BFL from an IMAGE side of the fifth lens (L5) to an IMAGE plane (IMAGE) and the total optical length TTL of the fixed focus lens satisfy the relation:
0.30≤BFL/TTL≤0.35。
12. the prime lens according to any one of claims 1 to 3, wherein a temperature coefficient of relative refractive index dn/dt of at least one of the third lens (L3), the fourth lens (L4), and the fifth lens (L5) satisfies the following relationship:
dn/dt≤3×10-6/℃。
13. the prime lens according to any one of claims 1 to 3, wherein at least one of the first lens (L1), the second lens (L2), the third lens (L3), the fourth lens (L4) and the fifth lens (L5) is a low-dispersion glass lens, and an Abbe number VD of the low-dispersion glass lens satisfies the following relation:
VD≥60。
CN202211177362.9A 2022-09-26 2022-09-26 Fixed focus lens Pending CN115480378A (en)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW201126197A (en) * 2010-01-19 2011-08-01 Largan Precision Co Ltd Optical photographing lens assembly
CN202230238U (en) * 2011-03-09 2012-05-23 大立光电股份有限公司 Optical lens group for camera shooting
CN106597641A (en) * 2017-01-22 2017-04-26 东莞市宇瞳光学科技股份有限公司 Small-size low-cost 4MP athermalized prime lens
CN109188654A (en) * 2018-10-30 2019-01-11 舜宇光学(中山)有限公司 Wide-angle lens
CN111624747A (en) * 2019-02-27 2020-09-04 株式会社腾龙 Optical imaging system and imaging device
JP2020154045A (en) * 2019-03-18 2020-09-24 株式会社デンソー Imaging optical system
US20210191086A1 (en) * 2019-06-10 2021-06-24 Kantatsu Co., Ltd. Imaging lens
CN218158530U (en) * 2022-09-26 2022-12-27 舜宇光学(中山)有限公司 Fixed focus lens

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW201126197A (en) * 2010-01-19 2011-08-01 Largan Precision Co Ltd Optical photographing lens assembly
CN202230238U (en) * 2011-03-09 2012-05-23 大立光电股份有限公司 Optical lens group for camera shooting
CN106597641A (en) * 2017-01-22 2017-04-26 东莞市宇瞳光学科技股份有限公司 Small-size low-cost 4MP athermalized prime lens
CN109188654A (en) * 2018-10-30 2019-01-11 舜宇光学(中山)有限公司 Wide-angle lens
CN111624747A (en) * 2019-02-27 2020-09-04 株式会社腾龙 Optical imaging system and imaging device
JP2020154045A (en) * 2019-03-18 2020-09-24 株式会社デンソー Imaging optical system
US20210191086A1 (en) * 2019-06-10 2021-06-24 Kantatsu Co., Ltd. Imaging lens
CN218158530U (en) * 2022-09-26 2022-12-27 舜宇光学(中山)有限公司 Fixed focus lens

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