CN114895432A - Glass-plastic mixed fixed-focus optical system - Google Patents
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Abstract
The invention relates to a glass-plastic mixed fixed-focus optical system, which comprises: a first lens (L1) having negative power, a second lens (L2) having positive power, a third lens (L3) having positive power, a fourth lens (L4) having negative power, and a fifth lens (L5) having positive power, which are arranged in this order in a direction from the object side to the image side along the optical axis, and an effective focal length F of the optical system and an optical back focus BFL of the optical system satisfy the relationship: F/BFL is more than or equal to 1.18 and less than or equal to 1.25. The glass-plastic mixed fixed-focus optical system has the high-quality imaging performance required by low cost, miniaturization, no virtual focus in high and low temperature states, day and night confocal property, large aperture (FNO1.6), no thermalization and 8MP image output.
Description
Technical Field
The invention relates to the technical field of optical elements, systems or instruments, in particular to a glass-plastic mixed fixed-focus optical system.
Background
The security monitoring lens can monitor all weather and in multiple directions, and manpower and material resources are greatly saved. The traditional prime lens adopts more full glass designs, which is not only not beneficial to miniaturization, but also brings cost rise. In the modern society of scientific and technological high-speed development, the requirements for the fixed-focus monitoring lens tend to ensure that the imaging is kept clear under the conditions of higher imaging definition, miniaturization and low illumination. Although the cost of most glass-plastic mixed fixed-focus lenses in the market is greatly reduced, the excellent properties of large aperture, high and low temperature non-virtual focus, day and night confocal and the like are difficult to be considered simultaneously under the condition of low cost.
In view of the above problems, it is desirable to provide an imaging lens that is low in cost, small in size, free of virtual focus in high and low temperature states, large in aperture, and confocal day and night, and that improves the imaging performance.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a glass-plastic mixed fixed-focus optical system which has high-quality imaging performance required by low cost, miniaturization, no virtual focus in high and low temperature states, day and night confocal performance, large aperture (FNO1.6), no thermalization and 8MP image output.
In order to achieve the above object, the present invention provides a glass-plastic mixed fixed focus optical system, comprising: the optical system comprises a first lens with negative focal power, a second lens with positive focal power, a third lens with positive focal power, a fourth lens with negative focal power and a fifth lens with positive focal power 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 optical system and the optical back focus BFL of the optical system satisfy the following relation: F/BFL is more than or equal to 1.18 and less than or equal to 1.25.
According to an aspect of the present invention, the first lens, the second lens, the fourth lens and the fifth lens are all plastic aspheric lenses;
the third lens is a glass spherical lens.
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 convex-concave lens;
the second lens is a concave-convex lens;
the third lens and the fifth lens are both convex lenses;
the fourth lens is concave-convex or concave-convex in the paraxial region.
According to an aspect of the invention, the optical system further comprises a diaphragm located between the first lens and the second lens.
According to an aspect of the present invention, a focal length F1 of the first lens and a focal length FII of the lens group of the stop toward the image plane side satisfy the relation: F1/FII is less than or equal to-6.53 and less than or equal to-3.8.
According to one aspect of the invention, a distance D2 between the center of the image side surface of the fifth lens and the diaphragm surface and a total optical length TTL of the optical system satisfy the relation: D2/TTL is more than or equal to 0.52 and less than or equal to 0.55.
According to one aspect of the invention, the sago 11 of the maximum optically effective diameter of the first lens object side and the radius of curvature R1 of the first lens object side satisfy the relationship: R1/SAG11 is more than or equal to 1.68 and less than or equal to 1.96.
According to one aspect of the invention, the sago 12 of the maximum optically effective diameter of the first lens image side surface and the radius of curvature R2 of the first lens image side surface satisfy the relationship: R2/SAG12 is more than or equal to 1.36 and less than or equal to 1.67.
According to an aspect of the present invention, a radius of curvature R3 of the object-side surface of the second lens and a radius of curvature R2 of the image-side surface of the first lens satisfy the relationship: R3/R2 is not less than-1.89 and not more than-1.8.
According to one aspect of the invention, a distance D45 between the fourth lens image-side surface and the fifth lens object-side surface and a distance D34 between the third lens image-side surface and the fourth lens object-side surface satisfy the relation: D45/(D34+ D45) is not less than 0.89 and not more than 0.92.
According to an aspect of the invention, the focal length F3 of the third lens and the effective focal length F of the optical system satisfy the relation: F3/F is more than or equal to 1.07 and less than or equal to 1.25.
According to an aspect of the invention, a focal length F5 of the fifth lens and an effective focal length F of the optical system satisfy the relation: F5/F is more than or equal to 0.79 and less than or equal to 0.87.
According to one aspect of the invention, the optical system at least comprises a lens made of low-dispersion material, and the Abbe number Vd of the lens is larger than or equal to 65.
According to the scheme of the invention, the optical system totally adopts five lenses, the concave-convex property, the material and the focal power distribution of each lens are reasonably set, the transmission of light rays is favorably improved, various aberrations of the optical system can be well corrected, the optical system also realizes low cost, miniaturization (the total length TTL of the optical system containing protective plate glass is less than or equal to 22.45mm), simple structure, no virtual focus at high and low temperatures, day and night confocal, large aperture (FNO1.6) and no heat performance, the 8MP image output requirement, uniform integral illumination and high brightness. Meanwhile, the height of the image plane of the optical system can reach phi 7.0mm, the CRA is less than or equal to 12 degrees, and the optical system can be adapted to a sensor (sensor).
According to one scheme of the invention, by reasonably matching up four spherical lenses and four aspheric lenses, the strong aberration correcting capability of the aspheric lenses is fully utilized, and the back focal drift caused by the change of the refractive index of the lenses along with the temperature is greatly eliminated, so that the glass-plastic mixed fixed-focus optical system still has good resolution at high and low temperatures, is free of virtual focus within the temperature range of-40-80 ℃ and is confocal day and night.
According to one scheme of the invention, by setting the effective focal length and the optical back focus of the optical system, the diversity of the structure assembly process can be realized, the single part and the assembly tolerance are better, the manufacturability is good, and the competitiveness of the product is further improved.
According to one scheme of the invention, by setting the relation between the curvature radius of the object side surface and the curvature radius of the image side surface and the rise in the first lens, the relative aperture size of the first lens can be controlled, the processability of the lens is ensured, the incident height of light rays entering an optical system can be reduced, and the correction of distortion and off-axis aberration is facilitated. In addition, the relationship between the curvature radius of the image side surface of the first lens and the curvature radius of the object side surface of the second lens is matched, so that the light converging effect is improved, and the front end structure of the optical system is more compact.
According to one scheme of the invention, the lens made of the low-dispersion material is arranged, so that chromatic aberration of an optical system can be further corrected, high-quality imaging of blue light and near-infrared light can be balanced, and the purple fringe risk can be ensured to be lower under the condition that infrared defocusing is smaller.
Drawings
Fig. 1 is a schematic structural diagram of a glass-plastic hybrid fixed-focus optical system according to a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a glass-plastic hybrid fixed-focus optical system according to a second embodiment of the present invention;
fig. 3 schematically shows a structural schematic diagram of a glass-plastic hybrid fixed-focus optical system according to a third embodiment of the present invention.
Detailed Description
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.
In describing embodiments of the present invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship that is based on the orientation or positional relationship shown in the associated drawings, which is for convenience and simplicity of description only, and does not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, the above-described terms should not be construed as limiting the present invention.
The present invention is described in detail below with reference to the drawings and the specific embodiments, which are not repeated herein, but the embodiments of the present invention are not limited to the following embodiments.
Referring to fig. 1, the glass-plastic hybrid fixed-focus optical system of the present invention includes: a first lens L1 having negative optical power, a second lens L2 having positive optical power, a third lens L3 having positive optical power, a fourth lens L4 having negative optical power, and a fifth lens L5 having positive optical power, which are arranged in this order from the object side to the image side along the optical axis. The optical system further includes a stop STO between the first lens L1 and the second lens L2. The effective focal length F of the optical system and the optical back focus BFL thereof satisfy the relation: F/BFL is more than or equal to 1.18 and less than or equal to 1.25. 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. The object-side surface of the first lens L1 is convex, and the image-side surface thereof is concave. The object-side surface of the second lens L2 is concave, and the image-side surface thereof is convex. The shapes of the object-side surface and the image-side surface of the third lens L3 and the fifth lens L5 are both convex. The object side surface of the fourth lens L4 is concave or convex in shape at the paraxial region, and the image side surface is concave in shape at the paraxial region. The glass-plastic mixed fixed-focus optical system totally adopts five lenses, and by reasonably matching the spherical lens and the aspheric lens, the plastic aspheric lens has four lenses, so that the strong aberration correction capability of the aspheric lens is fully utilized, the back focus drift caused by the change of the refractive index of the lens along with the temperature is greatly eliminated, the glass-plastic mixed fixed-focus optical system still has good resolution at high and low temperatures, is free from virtual focus within the temperature range of-40-80 ℃ and is confocal day and night. Above-mentioned optical system is through the concavity and convexity nature and the material of each lens of reasonable setting, the focal power distribution, be favorable to improving the transmissibility of light, can rectify optical system's all kinds of aberrations well, still make it realize low cost, it is miniaturized, moreover, the steam generator is simple in structure, high low temperature not virtual burnt, day and night confocal, big light ring (FNO1.6), do not have the compromise of thermal property ability, 8MP image output requirement, and whole illuminance is even, luminance is high, when improving the performance greatly reduced cost and volume. Meanwhile, the height of the image plane of the optical system can reach phi 7.0mm, the CRA is less than or equal to 12 degrees, and the optical system can be adapted to a sensor (sensor). By setting the effective focal length and the optical back focus of the optical system, the diversity of the structure assembly process can be realized, the single part and the assembly tolerance are better, the manufacturability is good, and the competitiveness of the product is further improved.
In the present invention, the focal length F1 of the first lens L1 and the focal length FII of the lens group on the side of the image plane IMA of the stop STO satisfy the relationship: F1/FII is less than or equal to-6.53 and less than or equal to-3.8. The reasonable collocation of the focal power ensures that the glass-plastic mixed fixed-focus optical system has the superior performances of large aperture and high resolution.
In the present invention, the rise SAG11 of the maximum optical effective diameter of the object side of the first lens L1 and the radius of curvature R1 of the object side of the first lens L1 satisfy the relation: R1/SAG11 is more than or equal to 1.68 and less than or equal to 1.96. The saggital height SAG12 of the maximum optical effective diameter of the image side surface of the first lens L1 and the curvature radius R2 of the image side surface of the first lens L1 satisfy the relation: R2/SAG12 is more than or equal to 1.36 and less than or equal to 1.67. So set up the relation of object side, image side curvature radius and rise in first lens L1, can control the relative aperture size of first lens L1, can also reduce the incident height that light got into this glass and mould mixture prime optical system when guaranteeing lens processing nature, be favorable to correcting distortion and off-axis aberration.
In the present invention, the radius of curvature R3 of the object-side surface of the second lens L2 and the radius of curvature R2 of the image-side surface of the first lens L1 satisfy the relationship: R3/R2 is not less than-1.89 and not more than-1.8. The relation between the object side curvature radius of the first lens L1 and the second lens L2 is favorable for improving the light convergence effect, so that the front end structure of the glass-plastic mixed fixed-focus optical system is more compact.
In the present invention, the distance D45 from the image-side surface of the fourth lens L4 to the object-side surface of the fifth lens L5 and the distance D34 from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4 satisfy the relationship: D45/(D34+ D45) is not less than 0.89 and not more than 0.92. By properly controlling the air space from the fourth lens L4 to the third lens L3 or the fifth lens L5, it is advantageous to improve transmissibility, reduce air space sensitivity, and reduce lens tolerance.
In the present invention, the distance D2 from the center of the image-side surface of the fifth lens L5 to the stop STO surface and the total optical length TTL of the optical system satisfy the relationship: D2/TTL is more than or equal to 0.52 and less than or equal to 0.55. The glass-plastic mixed fixed-focus optical system is more compact as a whole due to the position relation, the size is small, and the total length TTL of the optical system is less than or equal to 22.45mm under the condition that the optical system comprises the protective plate glass CG.
In the present invention, the focal length F3 of the third lens L3 and the effective focal length F of the optical system satisfy the relationship: F3/F is more than or equal to 1.07 and less than or equal to 1.25. The focal length F5 of the fifth lens L5 and the effective focal length F of the optical system satisfy the relationship: F5/F is more than or equal to 0.79 and less than or equal to 0.87. Through the reasonable collocation of the focal power of the lens, the chromatic aberration of the glass-plastic mixed fixed-focus optical system can be corrected, and the resolution of the system is improved.
The optical system at least comprises a lens made of low dispersion material, and the Abbe number Vd of the lens is not less than 65. So set up and to further correct this glass and mould mixed tight optical system's colour difference, balanced blue light and near infrared light's high quality formation of image can guarantee that purple border risk is lower under infrared out of focus less condition.
In summary, referring to fig. 1, the glass-plastic hybrid fixed-focus optical system of the present invention adopts 5 lenses, a stop STO located between the first lens L1 and the second lens L2, and a protective plate glass CG, and the 5 lenses have an optical architecture of "negative-positive-negative-positive" in order from the object side to the image side, and by reasonably setting the concavity and convexity, material, and focal power distribution of each lens, it is beneficial to improve the transmissibility of light, and can correct various aberrations of the optical system well, so that the requirements of outputting large aperture (FNO1.6) and 8MP images can be achieved, and the overall illumination is uniform and the brightness is high. By skillfully matching the glass-plastic mixed material and the positive and negative focal powers, the back focal drift of the lens at high and low temperatures is perfectly compensated, the clear imaging of an optical system at the limit temperature is ensured, the optical system does not have virtual focus within the temperature range of-40-80 ℃, and the optical system has confocal property at day and night. The plastic aspheric lens has 4 lenses, so that the cost is greatly reduced while the performance of the optical system is improved, and the product competitiveness is improved. Meanwhile, the height of the image plane of the optical system can reach phi 7.0mm, the CRA is less than or equal to 12 degrees, the optical system can be adapted to a sensor (sensor), the application prospect is wide, and the market competitiveness is improved. The total length TTL of the optical system is less than or equal to 22.45mm (including protective plate glass), the volume is small, the single part and the assembly tolerance are better, and the manufacturability is good.
The glass-plastic hybrid fixed-focus optical system of the present invention is specifically described below in 3 embodiments with reference to the accompanying drawings and tables. In the following embodiments, the present invention designates the stop STO as one surface and the image surface IMA as one surface.
The parameters of each example specifically corresponding to the above relationship are shown in table 1 below:
| conditional formula (II) | Example one | Example two | EXAMPLE III |
| 1.68≤R1/SAG11≤1.96 | 1.8 | 1.96 | 1.9 |
| 1.36≤R2/SAG12≤1.67 | 1.38 | 1.65 | 1.67 |
| -1.89≤R3/R2≤-1.8 | -1.89 | -1.85 | -1.83 |
| -6.53≤F1/FII≤-3.8 | -4.93 | -5 | -6.53 |
| 1.18≤F/BFL≤1.25 | 1.22 | 1.25 | 1.2 |
| 0.89≤D45/(D34+D45)≤0.92 | 0.9 | 0.92 | 0.89 |
| 0.52≤D2/TTL≤0.55 | 0.52 | 0.55 | 0.54 |
| 1.07≤f3/F≤1.25 | 1.25 | 1.22 | 1.18 |
| 0.79≤f5/F≤0.87 | 0.79 | 0.87 | 0.82 |
TABLE 1
In various embodiments of the present invention, the plastic aspheric lens of the glass-plastic hybrid fixed-focus optical system 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 one
Referring to fig. 1, the parameters of the glass-plastic hybrid fixed-focus optical system of the present embodiment are as follows:
TTL＝22.25mm，FNO＝1.6。
relevant parameters of each lens of the glass-plastic hybrid fixed-focus optical system of the present embodiment include a surface type, a curvature radius R value, a thickness, a refractive index of a material, and an abbe number, and S1 to S13 represent each surface of each lens, stop STO, and protective plate glass CG in the optical system, as shown in table 2 below.
| Number of noodles | Surface type | R value | Thickness of | Refractive index | Abbe number |
| S1 | Aspherical surface | 3.160 | 1.44 | 1.54 | 55.98 |
| S2 | Aspherical surface | 2.208 | 2.59 | ||
| S3(STO) | Spherical surface | Infinity | 0.75 | ||
| S4 | Aspherical surface | -4.174 | 2.60 | 1.64 | 23.53 |
| S5 | Aspherical surface | -3.784 | 0.07 | ||
| S6 | Spherical surface | 7.133 | 2.85 | 1.44 | 95.10 |
| S7 | Spherical surface | -10.377 | 0.07 | ||
| S8 | Aspherical surface | -2346.908 | 0.8 | 1.64 | 23.53 |
| S9 | Aspherical surface | 3.332 | 0.62 | ||
| S10 | Aspherical surface | 4.737 | 3.8 | 1.54 | 55.71 |
| S11 | Aspherical surface | -8.905 | 5.65 | ||
| S12 | Spherical surface | Infinity | 0.8 | 1.52 | 64.20 |
| S13 | Spherical surface | Infinity | 0.2 | ||
| S14(IMA) | Spherical surface | Infinity |
TABLE 2
The aspheric coefficients of the aspheric lenses of the glass-plastic hybrid fixed-focus optical system of the embodiment include a conic constant K value and a fourth-order aspheric 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 And a twelfth order aspherical surface coefficient A 12 As shown in table 3 below.
TABLE 3
Referring to fig. 1, in combination with tables 1 to 3, the optical system of the present embodiment achieves low cost, miniaturization (total TTL of the optical system including the protective plate glass is 22.25mm), simple structure, good resolution at high and low temperatures, no virtual focus in a temperature range of-40 ℃ to 80 ℃, day and night confocal performance, large aperture (FNO1.6), no thermal performance, and 8MP image output requirements, and uniform overall illumination and high brightness. Meanwhile, the height of the image plane of the optical system can reach phi 7.0mm, the CRA is less than or equal to 12 degrees, and the optical system can be adapted to a sensor (sensor). The single part and the assembly tolerance are better, and the manufacturability is good.
Example two
Referring to fig. 2, in the present embodiment, the parameters of the glass-plastic mixed fixed-focus optical system are as follows:
TTL＝21.56mm，FNO＝1.7。
relevant parameters of each lens of the glass-plastic hybrid prime optical system of the present embodiment, including the surface type, the curvature radius R value, the thickness, the refractive index of the material, and the abbe number, S1 to S13 represent each surface of each lens in the prime lens, the stop STO, and the protective plate glass CG, as shown in table 4 below.
TABLE 4
The aspheric coefficients of the aspheric lenses of the glass-plastic hybrid fixed-focus optical system of the embodiment include a conic constant K value and a fourth-order aspheric 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 And a twelfth order aspherical surface coefficient A 12 As shown in table 5 below.
| Number of noodles | K | A 4 | A 6 | A 8 | A 10 | A 12 |
| S1 | -1.3851E+00 | 2.979E-003 | -1.468E-004 | -4.761E-006 | -7.264E-007 | -4.761E-008 |
| S2 | -0.4395E+00 | -3.759E-003 | -8.852E-004 | -1.988E-005 | -2.466E-005 | 1.109E-006 |
| S4 | -0.3315E+00 | 9.974E-004 | -3.927E-004 | 8.729E-007 | -7.172E-006 | -6.821E-008 |
| S5 | -2.9033E+00 | -2.237E-003 | -4.316E-005 | -3.320E-006 | -5.202E-007 | 4.463E-008 |
| S8 | -2.5984E+02 | -8.088E-004 | -1.485E-004 | -1.964E-005 | -6.146E-004 | -5.794E-007 |
| S9 | -5.3858E+00 | -7.013E-004 | -1.210E-004 | 2.739E-006 | 1.008E-006 | 1.263E-008 |
| S10 | -6.7666E+00 | -9.463E-005 | 7.479E-005 | -2.899E-006 | 1.463E-006 | -2.361E-007 |
| S11 | -59.187E+01 | -3.961E-003 | 4.838E-004 | -3.217E-005 | -2.165E-007 | 4.125E-007 |
TABLE 5
Referring to fig. 2, in combination with tables 1, 4 and 5, the optical system of the present embodiment achieves low cost, miniaturization (total TTL of the optical system including the protective plate glass is 21.56mm), simple structure, good resolution at high and low temperatures, no virtual focus in a temperature range of-40 ℃ to 80 ℃, day and night confocal, large aperture (FNO1.7), no thermal performance, 8MP image output requirements, uniform overall illumination, and high brightness. Meanwhile, the height of the image plane of the optical system can reach phi 7.0mm, the CRA is less than or equal to 12 degrees, and the optical system can be adapted to a sensor (sensor). The single part and the assembly tolerance are better, and the manufacturability is good.
EXAMPLE III
Referring to fig. 3, in the present embodiment, the parameters of the glass-plastic hybrid fixed-focus optical system are as follows:
TTL＝21.97mm，FNO＝1.8。
relevant parameters of each lens of the glass-plastic hybrid fixed-focus optical system of the present embodiment, including the surface type, the curvature radius R value, the thickness, the refractive index of the material, and the abbe number, S1 to S13 represent each surface of each lens in the fixed-focus lens, the stop STO, and the protective plate glass CG, as shown in table 6 below.
TABLE 6
The aspheric coefficients of the aspheric lenses of the glass-plastic hybrid fixed-focus optical system of the embodiment include a conic constant K value and a fourth-order aspheric 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 And a twelfth order aspherical surface coefficient A 12 Table 7 below shows.
| Number of noodles | K | A 4 | A 6 | A 8 | A 10 | A 12 |
| S1 | -1.3481E+00 | 2.596E-003 | -1.391E-004 | -7.271E-006 | 7.525E-007 | -2.539E-007 |
| S2 | -0.4483E+00 | -4.446E-003 | -9.916E-004 | 2.861E-006 | -2.047E-005 | -3.622E-007 |
| S4 | -0.4408E+00 | 1.156E-003 | -5.675E-004 | 2.383E-005 | -7.718E-006 | -6.783E-007 |
| S5 | -3.1453E+00 | -2.315E-003 | -9.925E-005 | -3.348E-006 | 3.662E-008 | -5.341E-008 |
| S8 | -8.2395E+01 | -2.584E-003 | -1.685E-004 | -6.312E-006 | 3.668E-006 | -4.045E-007 |
| S9 | -5.3053E+00 | -1.735E-003 | -2.627E-004 | 3.799E-005 | -2.878E-006 | -1.050E-008 |
| S10 | -5.5367E+00 | -1.939E-003 | 2.528E-004 | -2.014E-005 | 1.173E-006 | -5.723E-008 |
| S11 | -27.063E+01 | -3.898E-003 | 2.392E-004 | 1.175E-005 | -4.728E-006 | 5.854E-007 |
TABLE 7
Referring to fig. 3, in combination with tables 1, 6 and 7, the optical system of the present embodiment achieves low cost, miniaturization (total TTL of the optical system including the protective plate glass is 21.97mm), simple structure, good resolution at high and low temperatures, no virtual focus in a temperature range of-40 ℃ to 80 ℃, day and night confocal, large aperture (FNO1.8), no thermal performance, 8MP image output requirements, uniform overall illumination, and high brightness. Meanwhile, the height of the image plane of the optical system can reach phi 7.0mm, the CRA is less than or equal to 12 degrees, and the optical system can be adapted to a sensor (sensor). The single part and the assembly tolerance are better, and the manufacturability is good.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and it will be apparent to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (13)
1. A glass-plastic hybrid fixed-focus optical system comprising: a first lens (L1) having negative power, a second lens (L2) having positive power, a third lens (L3) having positive power, a fourth lens (L4) having negative power, and a fifth lens (L5) having positive power, which are arranged in this order in a direction from the object side to the image side along the optical axis, characterized in that the effective focal length F of the optical system and the optical back focus BFL of the optical system satisfy the relationship: F/BFL is more than or equal to 1.18 and less than or equal to 1.25.
2. The glass-plastic hybrid fixed-focus optical system according to claim 1, wherein the first lens (L1), the second lens (L2), the fourth lens (L4) and the fifth lens (L5) are all plastic aspheric lenses;
the third lens (L3) is a glass spherical lens.
3. The glass-plastic hybrid fixed-focus optical system according to claim 1, wherein along an optical axis in a direction from an object side to an image side,
the first lens (L1) is a convex-concave lens;
the second lens (L2) is a meniscus lens;
the third lens (L3) and the fifth lens (L5) are both convex lenses;
the fourth lens (L4) has a concave-convex shape at the paraxial region.
4. The glass-plastic hybrid fixed-focus optical system according to claim 1, characterized in that it further comprises a Stop (STO) located between the first lens (L1) and the second lens (L2).
5. Glass-plastic hybrid fixed-focus optical system according to claim 4, characterized in that the focal length F1 of said first lens (L1) and the focal length FII of the lens group on the side of said Stop (STO) facing the image plane (IMA) satisfy the relation: F1/FII is less than or equal to-6.53 and less than or equal to-3.8.
6. The glass-plastic hybrid fixed-focus optical system according to claim 4, wherein the distance D2 from the center of the image-side surface of the fifth lens (L5) to the Stop (STO) surface and the total optical length TTL of the optical system satisfy the relation: D2/TTL is more than or equal to 0.52 and less than or equal to 0.55.
7. The glass-plastic hybrid fixed-focus optical system of any one of claims 1 to 6, wherein the saggital height SAG11 of the maximum optical effective diameter of the object-side surface of the first lens (L1) and the curvature radius R1 of the object-side surface of the first lens (L1) satisfy the relation: R1/SAG11 is more than or equal to 1.68 and less than or equal to 1.96.
8. The glass-plastic hybrid fixed-focus optical system according to any one of claims 1 to 6, wherein the saggital height SAG12 of the maximum optical effective diameter of the image side surface of the first lens (L1) and the curvature radius R2 of the image side surface of the first lens (L1) satisfy the relation: R2/SAG12 is more than or equal to 1.36 and less than or equal to 1.67.
9. The glass-plastic hybrid fixed-focus optical system according to any one of claims 1 to 6, wherein the radius of curvature R3 of the object-side surface of the second lens (L2) and the radius of curvature R2 of the image-side surface of the first lens (L1) satisfy the relation: R3/R2 is not less than-1.89 and not more than-1.8.
10. The glass-plastic hybrid fixed-focus optical system according to any one of claims 1 to 6, wherein the central distance D45 from the image-side surface of the fourth lens (L4) to the object-side surface of the fifth lens (L5) and the central distance D34 from the image-side surface of the third lens (L3) to the object-side surface of the fourth lens (L4) satisfy the following relation: D45/(D34+ D45) is not less than 0.89 and not more than 0.92.
11. The glass-plastic hybrid fixed-focus optical system according to any one of claims 1 to 6, wherein the focal length F3 of the third lens (L3) and the effective focal length F of the optical system satisfy the relation: F3/F is more than or equal to 1.07 and less than or equal to 1.25.
12. The glass-plastic hybrid fixed-focus optical system according to any one of claims 1 to 6, wherein the focal length F5 of the fifth lens (L5) and the effective focal length F of the optical system satisfy the relation: F5/F is more than or equal to 0.79 and less than or equal to 0.87.
13. A glass-plastic mixed fixed-focus optical system as claimed in any one of claims 1 to 6, wherein the optical system comprises at least one lens made of a low-dispersion material, and the Abbe number Vd of the lens is not less than 65.
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| CN110441890A (en) * | 2019-09-16 | 2019-11-12 | 舜宇光学(中山)有限公司 | Glass modeling mixing wide-angle lens |
| US20200057280A1 (en) * | 2017-04-26 | 2020-02-20 | Kyocera Corporation | Imaging lens |
| CN112859299A (en) * | 2021-03-19 | 2021-05-28 | 舜宇光学(中山)有限公司 | Fixed focus lens |
| CN215833684U (en) * | 2021-05-17 | 2022-02-15 | 上海峰梅光学科技有限公司 | Optical lens |
| CN114236788A (en) * | 2021-12-14 | 2022-03-25 | 东莞市长益光电有限公司 | 6mm large-aperture athermalization glass-plastic hybrid lens |
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| US20200057280A1 (en) * | 2017-04-26 | 2020-02-20 | Kyocera Corporation | Imaging lens |
| CN110441890A (en) * | 2019-09-16 | 2019-11-12 | 舜宇光学(中山)有限公司 | Glass modeling mixing wide-angle lens |
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| CN114236788A (en) * | 2021-12-14 | 2022-03-25 | 东莞市长益光电有限公司 | 6mm large-aperture athermalization glass-plastic hybrid lens |
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