CN218272894U - Fixed focus lens - Google Patents
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- CN218272894U CN218272894U CN202220841055.5U CN202220841055U CN218272894U CN 218272894 U CN218272894 U CN 218272894U CN 202220841055 U CN202220841055 U CN 202220841055U CN 218272894 U CN218272894 U CN 218272894U
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Abstract
The utility model relates to a tight shot, include: the optical lens comprises a first lens (L1) with negative focal power, a second lens (L2) with positive focal power, a diaphragm (STOP), a third lens (L3) with positive focal power, a fourth lens (L4) with negative focal power, a fifth lens (L5) with positive focal power and protective plate glass (CG), which are sequentially arranged along the direction from the object side to the image side along an optical axis, wherein the effective focal length f of the fixed-focus lens and the total optical length TTL of the fixed-focus lens satisfy the following relation: TTL/f is more than or equal to 5.5 and less than or equal to 6.0. The utility model discloses a tight shot realizes that big light ring, fno are less than or equal to 1.75, the light flux is big, high pixel, small size, low cost, does not virtual burnt at the high low temperature within range of-40 ℃ -80 ℃, compromises infrared, dual-purpose optical imaging performance of day and night to realize the image capture of the biggest field angle 104.
Description
Technical Field
The utility model relates to an optical system technical field especially relates to a big light ring glass is moulded and is mixed dual-purpose tight shot day night.
Background
With the rapid development of the camera lens market, the requirements of customers on the performance of the lens are continuously increased. The light flux is big in the market at present, and the formation of image is clear to guarantee not have the confocal security protection camera lens of thermalization and day night, improve the camera lens performance and can adopt more pieces of lenses or reduce the mode realization in clear aperture, but can cause the not enough of the increase of cost or light flux, cost and performance are difficult to balance.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems existing in the prior art, the utility model aims to provide a fixed focus lens which has large aperture, high pixel, small volume, low cost, no virtual focus in the temperature range of-40 ℃ -80 ℃ and dual purposes of day and night.
To achieve the above object, the present invention provides a fixed focus lens, including: the optical lens comprises a first lens with negative focal power, a second lens with positive focal power, a diaphragm, a third lens with positive focal power, a fourth lens with negative focal power, a fifth lens with positive focal power and protective plate glass which are sequentially arranged in the direction from the object side to the image side along an optical axis, wherein the effective focal length f of the fixed-focus lens and the effective focal length f3 of the third lens satisfy the following relation: f3/f is more than or equal to 2.1 and less than or equal to 2.4.
According to an aspect of the present invention, in a direction from an object side to an image side along an optical axis,
the first lens is a paraxial convex-concave lens;
the second lens is a paraxial region concave-convex lens;
the third lens is a biconvex lens;
the fourth lens is a paraxial region biconcave lens or a paraxial region convex-concave lens;
the fifth lens is a paraxial region biconvex lens.
According to an aspect of the present invention, the first lens, the second lens, the fourth lens, and the fifth lens are aspheric lenses;
the third lens is a spherical lens.
According to the utility model discloses an aspect, the effective focal length f of tight shot with satisfy the relational expression between the effective focal length f1 of first lens: f1/f is more than or equal to-1.6 and less than or equal to-1.5.
According to the utility model discloses an aspect, the effective focal length f of tight shot with satisfy the relational expression between the effective focal length f2 of second lens: f2/f is more than or equal to 4.0 and less than or equal to 4.4.
According to the utility model discloses an aspect, the effective focal length f of tight shot with satisfy the relational expression between the effective focal length f4 of fourth lens: f4/f is more than or equal to-1.6 and less than or equal to-1.3.
According to an aspect of the present invention, the first lens and the second lens constitute the first lens group the focal length f12 with satisfy the relational expression between the effective focal length f of the prime lens: f12/f is more than or equal to minus 7.5 and less than or equal to minus 5.5.
According to the utility model discloses an aspect, the center of first lens thing side with the distance M1 of diaphragm with satisfy the relational expression between the optics total length TTL of tight shot: M1/TTL is more than or equal to 0.31 and less than or equal to 0.40.
According to the utility model discloses an aspect, the effective focal length f of tight shot with satisfy the relational expression between the half image height h of tight shot: f/h is more than or equal to 1.1 and less than or equal to 1.3.
According to the utility model discloses an aspect, the effective focal length f of tight shot with satisfy the relational expression between the optics total length TTL of tight shot: TTL/f is more than or equal to 5.5 and less than or equal to 6.0.
According to an aspect of the present invention, a temperature coefficient of relative refractive index dn/dt of at least one of the third lens, the fourth lens and the fifth lens is not more than 3 × 10 -6 /℃。
According to an aspect of the utility model, the first lens the second lens the fourth lens with the fifth lens are plastic aspheric surface lens.
According to the utility model discloses an aspect, the tight shot contains a piece of low dispersion glass material's lens at least, just the abbe number Vd of lens is more than or equal to 60.
According to the utility model discloses a scheme, this tight shot adopts five pieces of lens designs, through the concavity and convexity of optimizing each lens of configuration, material and positive and negative focal power, focus range isoparametric for big light ring, high pixel, little volume (the camera lens overall length that contains protection plate glass is less than or equal to 22.35 mm), low cost are realized to this camera lens, do not virtual burnt at-40 ℃ -80 ℃ high low temperature within range, compromise infrared, day and night dual-purpose optical imaging performance, be applicable to different environment. Meanwhile, the lens Fno is less than or equal to 1.75, the light flux is large, the integral illumination is uniform, the brightness is good, the image capture with the maximum field angle of 104 degrees and the high-quality imaging of five million pixels are realized, and the height of the image surface can reach phi 7.0mm. In addition, the lens unit has better assembly tolerance and good manufacturability.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 schematically shows a schematic structural view of a fixed focus lens according to embodiment 1 of the present invention;
fig. 2 schematically shows a schematic structural view of a fixed focus lens according to embodiment 2 of the present invention;
fig. 3 schematically shows a schematic structural diagram of a fixed focus lens according to embodiment 3 of the present invention.
Detailed Description
The embodiments described in this specification are to be considered in all respects as illustrative and not restrictive, and the accompanying drawings are intended to be part of the entire specification. 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 in a form 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 present 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 present invention is defined by the claims.
Referring to fig. 1, the fixed focus lens of the present invention comprises: the optical lens assembly comprises a first lens L1 with negative focal power, a second lens L2 with positive focal power, a third lens L3 with positive focal power, a fourth lens L4 with negative focal power, a fifth lens L5 with positive focal power and protective plate glass CG which are sequentially arranged along the direction from the object side to the image side along the optical axis. The prime lens further includes a STOP located between the second lens L2 and the third lens L3. The first lens L1, the second lens L2, the fourth lens L4, and the fifth lens L5 are all aspheric lenses, and the third lens L3 is a spherical lens. Preferably, the first lens L1, the second lens L2, the fourth lens L4 and the fifth lens L5 are all plastic aspheric lenses. The first lens element L1 has a convex shape in the object-side paraxial region and a concave shape in the image-side paraxial region. The second lens L2 has a concave shape at the object-side paraxial region and a convex shape at the image-side paraxial region. The third lens L3 has convex shapes on both the object-side surface and the image-side surface. The fourth lens element L4 has a concave or convex shape at the object-side paraxial region and a concave shape at the image-side paraxial region. The fifth lens element L5 has a convex shape in both the object-side and image-side paraxial regions.
Therefore, the lens enables the aberration of the lens to be effectively corrected by optimally configuring the positive and negative focal powers of the 5 lenses, the performance of an optical system can be further improved, and the resolving power can reach five million pixels. The optical structure which adopts 4 plastic aspheric lenses and only 1 glass lens is favorable for reducing the cost of the lens and effectively correcting the aberration of high and low temperature imaging, so that the lens has no virtual focus in the temperature range of-40-80 ℃ and can be used for day and night. In addition, by combining the different shapes of the image side surface and the object side surface of each lens, the Fno of the lens optical system is less than or equal to 1.75, the light transmission quantity is large, the integral illumination is uniform, the brightness is good, the optical performance of a large aperture and high pixels is realized, the image capture of the maximum field angle of 104 degrees is also realized, the single part and the assembly tolerance are good, and the manufacturability is good.
The utility model discloses in, satisfy following relational expression between the effective focal length f of this prime lens's effective focal length f and first lens L1's effective focal length f1, second lens L2's effective focal length f2, third lens L3's effective focal length f3 and fourth lens L4's effective focal length f4 respectively: f1/f is more than or equal to-1.6 and less than or equal to-1.5; f2/f is more than or equal to 4.0 and less than or equal to 4.4; f3/f is more than or equal to 2.1 and less than or equal to 2.4; f4/f is more than or equal to-1.6 and less than or equal to-1.3. Meanwhile, the following relation is satisfied between the focal length f12 of the first lens group consisting of the first lens L1 and the second lens L2 and the effective focal length f of the fixed-focus lens: f12/f is more than or equal to minus 7.5 and less than or equal to minus 5.5. The distance M1 between the center of the object side surface of the first lens L1 and the diaphragm STOP and the total optical length TTL of the fixed-focus lens satisfy the following relational expression: M1/TTL is more than or equal to 0.31 and less than or equal to 0.40. Through the setting of the relational expression, the focal lengths of all the lenses are combined and matched, and the position of the first lens L1 in the whole optical system is set, so that the chromatic aberration of the fixed-focus lens optical system can be corrected, and the realization of higher image quality is facilitated.
The utility model discloses in, satisfy the relational expression between this tight shot's effective focal length f and its half image height h: f/h is more than or equal to 1.1 and less than or equal to 1.3. The effective focal length f of the prime lens and the total optical length TTL thereof satisfy the relation: TTL/f is more than or equal to 5.5 and less than or equal to 6.0. The relation between the focal length of the lens and the height of the half image and the total optical length is set, so that the lens is beneficial to realizing higher image quality and ensuring smaller volume, namely the total length of the lens containing the protective plate glass CG is less than or equal to 22.35mm. Moreover, the height of the image surface of the lens can reach phi 7.0mm, the lens can be adapted to but not limited to a 1/2.7' sensor, the market competitiveness is improved, and the application prospect is wide.
In the present invention, the temperature coefficient of relative refractive index dn/dt of at least one of the third lens element L3, the fourth lens element L4 and the fifth lens element L5 is not more than 3 × 10 -6 /. Degree.C.. The prime lens at least comprises a lens made of low-dispersion glass material, and the Abbe number Vd of the lens is more than or equal to 60. So set up the relative refractive index temperature coefficient and the dispersion coefficient of lens, not only solved the thermal drift problem of this camera lens under the high low temperature environment of 80 ℃ and minus 40 ℃, the colour difference of this camera lens has still effectively been rectified, thereby is favorable to the utility model discloses a fixed focus camera lens realizes not virtual burnt at the temperature range of minus 40 ℃ -80 ℃, and is applicable in different environment.
To sum up, the utility model discloses a concavity and convexity, material and positive and negative focal power, focus scope isoparametric of five pieces of lenses of reasonable setting, collocation prime lens for big light ring, high pixel, small volume, low cost are realized to this camera lens, and at-40 ℃ -80 ℃ high low temperature within range virtual burnt, compromise infrared, day and night dual-purpose optical imaging performance, are applicable to different environment. Meanwhile, the lens Fno is less than or equal to 1.75, the light flux is large, the integral illumination is uniform, the brightness is good, the image capture with the maximum field angle of 104 degrees and the high-image-quality imaging of five million pixels are realized, and the image surface height can reach phi 7.0mm.
The following describes the fixed focus lens of the present invention in 3 embodiments with reference to the accompanying drawings and tables. In each of the following embodiments, the present invention records the STOP as one side and the IMAGE plane as one side.
The parameters of each example specifically satisfying the above conditional expressions are shown in table 1 below:
TABLE 1
In various embodiments of the present invention, the plastic aspheric 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 where the height perpendicular to the optical axis is h 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 1
Referring to fig. 1, the parameters of the fixed focus lens of the present embodiment are as follows:
fno:1.714; total lens length: 22.24mm; the field angle: at most 104 deg.
The relevant parameters of each lens in the fixed-focus lens of the embodiment include: surface type, radius of curvature, thickness, refractive index of material, and abbe number, and S1 to S13 represent each surface of each lens, STOP, and protective plate glass CG in the prime lens, as shown in table 2 below.
TABLE 2
The aspheric coefficients of the aspheric lenses of the fixed-focus lens of the present embodiment include: the quadric surface constant K and the fourth-order aspheric surface coefficient A of the surface 4 Sixth order aspherical surface coefficient A 6 Eighth order aspheric surface coefficient A 8 Ten-order aspheric surface coefficient A 10 Twelve-order aspheric surface coefficient A 12 And fourteen order aspheric coefficients A 14 As shown in table 3 below.
| Number of noodles | K | A 4 | A 6 | A 8 | A 10 | A 12 | A 14 |
| S1 | -4.67 | -4.29E-03 | 2.30E-04 | -7.15E-06 | 9.39E-08 | 3.97E-10 | 0.00E+00 |
| S2 | -0.89 | -2.75E-03 | 5.23E-04 | -2.85E-05 | 1.22E-05 | -1.19E-06 | 0.00E+00 |
| S3 | 5.47 | 2.58E-03 | -1.33E-05 | -4.67E-06 | 3.12E-06 | -3.73E-07 | 0.00E+00 |
| S4 | -6.99E-03 | 1.73E-03 | -1.21E-04 | 1.46E-05 | -1.70E-06 | 6.98E-08 | 0.00E+00 |
| S8 | -2.54E+06 | -2.62E-03 | -1.31E-04 | 3.69E-05 | -2.46E-05 | 4.83E-06 | -3.59E-07 |
| S9 | -1.43 | -9.67E-03 | 1.82E-03 | -4.96E-04 | 1.32E-04 | -2.12E-05 | 1.35E-06 |
| S10 | -3.04 | -5.53E-03 | 8.09E-04 | -2.46E-05 | 3.52E-06 | -2.06E-07 | 4.12E-08 |
| S11 | -0.09 | -1.06E-03 | -3.65E-05 | -6.93E-06 | 1.77E-05 | -3.31E-06 | 2.93E-07 |
TABLE 3
Referring to fig. 1, in combination with tables 1 to 3, the fixed-focus lens of the present embodiment achieves a large aperture, a high pixel, a small volume (the total length of the lens with the protective plate glass CG is 22.24 mm), a low cost, no virtual focus in a high-low temperature range of-40 ℃ to 80 ℃, optical imaging performance for both infrared and day and night, and is suitable for different environments. Meanwhile, the lens Fno =1.714 has large light flux, uniform integral illumination and good brightness, realizes image capture of a field angle of 104 degrees and high image quality imaging of five million pixels, and has an image plane height of phi 7.0mm. In addition, the lens unit has better assembly tolerance and good manufacturability.
Example 2
Referring to fig. 2, the parameters of the fixed-focus lens of the present embodiment are as follows:
fno:1.676; total length of lens: 22.32mm; the field angle: 104 degrees.
The relevant parameters of each lens in the fixed focus lens of the embodiment include: surface type, radius of curvature, thickness, refractive index and abbe number of the material, S1 to S13 represent each surface of each lens, STOP and protective plate glass CG in the prime lens, as shown in table 4 below.
| Noodle sequence number | Surface type | Radius of curvature | Thickness of | Refractive index | Abbe number |
| S0(OBJ) | STANDARD | Infinity | Infinity | ||
| S1 | EVENASPH | 6.308 | 1.25 | 1.53 | 55.5 |
| S2 | EVENASPH | 1.993 | 2.85 | ||
| S3 | EVENASPH | -7.710 | 3.34 | 1.61 | 25.6 |
| S4 | EVENASPH | -5.078 | 0.73 | ||
| S5(Stop) | STANDARD | Infinity | 0.69 | ||
| S6 | STANDARD | 10.347 | 3.42 | 1.46 | 90.3 |
| S7 | STANDARD | -5.693 | 0.32 | ||
| S8 | EVENASPH | -2616.467 | 0.65 | 1.64 | 23.4 |
| S9 | EVENASPH | 3.602 | 0.35 | ||
| S10 | EVENASPH | 3.932 | 1.98 | 1.53 | 55.5 |
| S11 | EVENASPH | -7.583 | 5.67 | ||
| S12 | STANDARD | Infinity | 0.80 | 1.52 | 64.2 |
| S13 | STANDARD | Infinity | 0.27 | ||
| S14(IMAGE) | STANDARD | Infinity | 0.00 |
TABLE 4
The aspheric surface coefficients of the aspheric surface lenses of the prime lens of the embodiment include: the conic surface constant K and fourth-order aspheric surface coefficient A 4 Sixth order aspherical surface coefficient A 6 Eighth order aspheric surface coefficient A 8 Ten-order aspheric surface coefficient A 10 Twelve-order aspheric surface coefficient A 12 And fourteen order aspheric surface coefficient A 14 As shown in table 5 below.
| Number of noodles | K | A 4 | A 6 | A 8 | A 10 | A 12 | A 14 |
| S1 | -4.68 | -4.30E-03 | 2.30E-04 | -7.15E-06 | 9.39E-08 | 3.97E-10 | 0.00E+00 |
| S2 | -0.89 | -2.75E-03 | 5.24E-04 | -2.84E-05 | 1.22E-05 | -1.19E-06 | 0.00E+00 |
| S3 | 5.47 | 2.58E-03 | -1.32E-05 | -4.65E-06 | 3.13E-06 | -3.67E-07 | 0.00E+00 |
| S4 | -6.02E-03 | 1.73E-03 | -1.22E-04 | 1.44E-05 | -1.70E-06 | 7.24E-08 | 0.00E+00 |
| S8 | 0.00 | -2.55E-03 | -1.36E-04 | 3.61E-05 | -2.46E-05 | 4.84E-06 | -3.54E-07 |
| S9 | -1.46 | -9.69E-03 | 1.82E-03 | -4.95E-04 | 1.32E-04 | -2.12E-05 | 1.34E-06 |
| S10 | -3.03 | -5.50E-03 | 8.09E-04 | -2.50E-05 | 3.48E-06 | -2.05E-07 | 4.21E-08 |
| S11 | -0.08 | -1.06E-03 | -3.69E-05 | -6.86E-06 | 1.78E-05 | -3.30E-06 | 2.94E-07 |
TABLE 5
Referring to fig. 2, in combination with tables 1, 4 and 5, the fixed focus lens of the present embodiment achieves a large aperture, a high pixel, a small volume (the total length of the lens with the protective plate glass CG is 22.32 mm), a low cost, no virtual focus in a high and low temperature range of-40 ℃ to 80 ℃, infrared and day and night dual-purpose optical imaging performance, and is suitable for different environments. Meanwhile, the lens Fno =1.676 has the advantages of large light flux, uniform integral illumination and good brightness, and can realize image capture of a field angle of 104 degrees and high-image-quality imaging of five million pixels, and the height of an image surface can reach phi 7.0mm. In addition, the lens unit has better assembly tolerance and good manufacturability.
Example 3
Referring to fig. 3, the parameters of the fixed-focus lens of the present embodiment are as follows:
fno:1.730; total length of lens: 22.24mm; the field angle: 104 degrees.
The relevant parameters of each lens in the fixed focus lens of the embodiment include: surface type, radius of curvature, thickness, refractive index and abbe number of the material, S1 to S13 represent each surface of each lens, STOP and protective plate glass CG in the prime lens, as shown in table 6 below.
| Number of noodles | Surface type | Radius of curvature | Thickness of | Refractive index | Abbe number |
| S0(OBJ) | STANDARD | Infinity | Infinity | ||
| S1 | EVENASPH | 6.336 | 1.02 | 1.54 | 55.7 |
| S2 | EVENASPH | 1.984 | 2.82 | ||
| S3 | EVENASPH | -7.644 | 3.28 | 1.61 | 25.6 |
| S4 | EVENASPH | -5.028 | 0 | ||
| S5(Stop) | STANDARD | Infinity | 1.40 | ||
| S6 | STANDARD | 10.717 | 3.57 | 1.46 | 90.2 |
| S7 | STANDARD | -5.623 | 0.31 | ||
| S8 | EVENASPH | 76.350 | 0.67 | 1.64 | 23.5 |
| S9 | EVENASPH | 3.608 | 0.40 | ||
| S10 | EVENASPH | 3.905 | 2.07 | 1.54 | 55.7 |
| S11 | EVENASPH | -7.633 | 5.69 | ||
| S12 | STANDARD | Infinity | 0.80 | 1.52 | 64.2 |
| S13 | STANDARD | Infinity | 0.21 | ||
| S14(IMAGE) | STANDARD | Infinity | 0.00 |
TABLE 6
The aspheric coefficients of the aspheric lenses of the fixed-focus lens of the present embodiment include: the quadric surface constant K and the fourth-order aspheric surface coefficient A of the surface 4 Sixth order aspherical surface coefficient A 6 Eighth order aspheric surface coefficient A 8 Ten-order aspheric surface coefficient A 10 Twelve-order aspheric surface coefficient A 12 And fourteen order aspheric coefficients A 14 Table 7 below shows.
TABLE 7
Referring to fig. 3, in combination with tables 1, 6 and 7, the fixed-focus lens of the present embodiment achieves a large aperture, a high pixel, a small volume (the total length of the lens with the protective plate glass CG is 22.24 mm), a low cost, no virtual focus in a high-low temperature range of-40 ℃ to 80 ℃, both infrared and day-night optical imaging performance, and is suitable for different environments. Meanwhile, the lens Fno =1.730, the light flux amount is large, the integral illumination is uniform, the brightness is good, the image capture of the field angle of 104 degrees and the high-image-quality imaging of five million pixels are realized, and the height of the image surface can reach phi 7.0mm. In addition, the lens single part has better assembly tolerance and good manufacturability.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (13)
1. A fixed focus lens, comprising: the optical lens is characterized in that a first lens (L1) with negative focal power, a second lens (L2) with positive focal power, a diaphragm (STOP), a third lens (L3) with positive focal power, a fourth lens (L4) with negative focal power, a fifth lens (L5) with positive focal power and protective plate glass (CG) are sequentially arranged in the direction from the object side to the image side along an optical axis, and the effective focal length f of the fixed-focus lens and the total optical length TTL of the fixed-focus lens satisfy the relation: TTL/f is more than or equal to 5.5 and less than or equal to 6.0.
2. The fixed focus lens according to 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 second lens (L2) is a paraxial region concave-convex lens;
the third lens (L3) is a biconvex lens;
the fourth lens (L4) is a paraxial region biconcave lens or a paraxial region convex-concave lens;
the fifth lens (L5) is a paraxial region biconvex lens.
3. 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 all aspheric lenses;
the third lens (L3) is a spherical lens.
4. A prime lens according to any one of claims 1 to 3, wherein the effective focal length f of the prime lens and the effective focal length f1 of the first lens (L1) satisfy the relation: f1/f is more than or equal to-1.6 and less than or equal to-1.5.
5. A prime lens according to any one of claims 1 to 3, wherein the effective focal length f of the prime lens and the effective focal length f2 of the second lens (L2) satisfy the relation: f2/f is more than or equal to 4.0 and less than or equal to 4.4.
6. A prime lens according to any one of claims 1 to 3, wherein the effective focal length f of the prime lens and the effective focal length f4 of the fourth lens (L4) satisfy the relation: f4/f is more than or equal to-1.6 and less than or equal to-1.3.
7. A prime lens according to any one of claims 1 to 3, wherein the focal length f12 of a first lens group consisting of the first lens (L1) and the second lens (L2) and the effective focal length f of the prime lens satisfy the relation: f12/f is not less than 7.5 and not more than-5.5.
8. A prime lens according to any one of claims 1 to 3, wherein the distance M1 between the center of the object-side surface of the first lens (L1) and the STOP (STOP) and the total optical length TTL of the prime lens satisfy the relationship: M1/TTL is more than or equal to 0.31 and less than or equal to 0.40.
9. The prime lens according to any one of claims 1 to 3, wherein the effective focal length f of the prime lens and the half-image height h of the prime lens satisfy the relation: f/h is more than or equal to 1.1 and less than or equal to 1.3.
10. A prime lens according to any one of claims 1 to 3, wherein the effective focal length f of the prime lens and the effective focal length f3 of the third lens (L3) satisfy the relation: f3/f is more than or equal to 2.1 and less than or equal to 2.4.
11. The prime lens according to any one of claims 1 to 3, wherein at least one of the third lens (L3), the fourth lens (L4) and the fifth lens (L5) has a temperature coefficient of relative refractive index dn/dt ≦ 3 x 10 -6 /℃。
12. The prime lens according to any one of claims 1 to 3, wherein the first lens (L1), the second lens (L2), the fourth lens (L4) and the fifth lens (L5) are all plastic aspheric lenses.
13. A prime lens according to any one of claims 1 to 3, wherein the prime lens comprises at least one lens of low-dispersion glass material and the Abbe number Vd of the lens is 60 or more.
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| CN202220841055.5U CN218272894U (en) | 2022-04-12 | 2022-04-12 | Fixed focus lens |
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| CN202220841055.5U CN218272894U (en) | 2022-04-12 | 2022-04-12 | Fixed focus lens |
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