CN112904539A - Optical system - Google Patents
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- CN112904539A CN112904539A CN202110321024.7A CN202110321024A CN112904539A CN 112904539 A CN112904539 A CN 112904539A CN 202110321024 A CN202110321024 A CN 202110321024A CN 112904539 A CN112904539 A CN 112904539A
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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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
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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
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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
- G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
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Abstract
The invention relates to an optical system comprising, arranged in order along an optical axis from an object side to an image side: a first lens (L1) having negative optical power, a second lens (L2) having negative optical power, a third lens (L3) having positive or negative optical power, a fourth lens (L4) having positive optical power, a fifth lens (L5) having negative optical power, and a sixth lens (L6) having positive optical power. The optical system can realize large-angle, large-aperture, high-resolution and day-night confocal.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to an optical system.
Background
With the improvement of living standard and the enhancement of safety consciousness, people have higher requirements on home security. Big angle, big light ring, high resolution are the characteristics of intelligent house monitoring lens, and can satisfy the camera lens of these requirements, and the cost often can be higher, and this is in violation of with the parent's price of intelligent monitoring product. Therefore, a large number of optical lenses with low cost and high imaging performance are needed.
Disclosure of Invention
The invention aims to provide an optical system with high imaging performance.
To achieve the above object, the present invention provides an optical system comprising, arranged in order from an object side to an image side along an optical axis: the lens system includes a first lens having negative power, a second lens having negative power, a third lens having positive power or negative power, a fourth lens having positive power, a fifth lens having negative power, and a sixth lens having positive power.
According to an aspect of the present invention, further comprising a stop between the second lens and the third lens or between the third lens and the fourth lens.
According to an aspect of the present invention, the first lens is a convex-concave spherical or aspherical lens, the second lens is an aspherical lens having a concave object-side surface, the third lens is an aspherical lens having a convex object-side surface, the fourth lens is a biconvex spherical lens, the fifth lens is an aspherical lens having a concave image-side surface, and the sixth lens is a biconvex aspherical lens.
According to an aspect of the present invention, the first lens is a plastic lens or a glass lens, the fourth lens is a glass lens, and the second lens, the third lens, the fifth lens and the sixth lens are plastic lenses.
According to one aspect of the invention, the Abbe number Vd of at least one of the first lens, the second lens and the fourth lens is larger than or equal to 50.
According to an aspect of the present invention, the focal length f1 of the first lens, the focal length f3 of the third lens, the focal length f4 of the fourth lens, the focal length f5 of the fifth lens, the focal length f6 of the sixth lens, and the effective focal length f of the optical system satisfy the following relations, respectively:
-2≤f1/f≤-1.5；
3.0≤|f3/f|≤152；
1.8≤f4/f≤2.4；
-3.3≤f5/f≤-2；
1.5≤f6/f≤2.3。
according to one aspect of the invention, the Abbe number Vd3 of the third lens is less than or equal to 30, and the Abbe number Vd4 of the fourth lens is greater than or equal to 70.
According to one aspect of the invention, the distance BFL from the center of the optical axis of the image side surface of the sixth lens to the image surface and the effective focal length f of the optical system and the total length TTL of the optical system respectively satisfy the following relations: BFL/TTL is more than or equal to 0.23 and less than or equal to 0.33; TTL/f is more than or equal to 6.6 and less than or equal to 7.5.
According to an aspect of the present invention, an air gap G12 between the first lens and the second lens, and an air gap G45 between the fourth lens and the fifth lens satisfy the following relational expressions: G12/G45 is more than or equal to 20 and less than or equal to 45.
According to an aspect of the present invention, a radius of curvature R9 of the image-side surface of the fourth lens and a radius of curvature R10 of the object-side surface of the fifth lens satisfy the following relation: the absolute value of R10/R9 is more than or equal to 1.5 and less than or equal to 65.
According to the scheme of the invention, the confocal of visible light and infrared light can be realized by reasonably setting the glass-plastic material, the concave-convex property and the focal power of each lens in the optical system, and the cost of the optical system is effectively reduced. In addition, the coke can be prevented from being burnt at the temperature of between 40 ℃ below zero and 80 ℃, and the method is suitable for different environments. The maximum aperture FNO1.6 can be realized, the resolution power can reach 8 million pixels, and the imaging target surface can reach 1/2.5 ". And the main ray angle CRA of the maximum view field of the optical system is less than or equal to 15 degrees, the sensor can be adapted to a plurality of sensors, the application prospect is wide, and the market competitiveness is improved. Image capturing with an object-side field angle of 150 ° can also be achieved. Therefore, the optical system has the advantages of large angle, large aperture, high resolution and day and night confocal property.
According to one scheme of the invention, different stop positions are selected, so that different light blocking positions and adjustment of the incident angle of the principal ray can be realized, the light rays can stably pass through the optical system, and the tolerance sensitivity of the whole optical system is reduced.
According to an aspect of the present invention, the abbe number of at least one of the first lens, the second lens, and the fourth lens is set to 50 or more, thereby achieving better chromatic aberration correction by using a low-dispersion material.
According to one scheme of the invention, by reasonably setting the relationship between the focal lengths of the first lens, the third lens, the fourth lens, the fifth lens and the sixth lens and the effective focal length of the optical system, the effective correction of aberration can be realized, so that the optical system meets the characteristic of high resolution, and simultaneously meets day and night confocal and high and low temperature non-virtual focal.
According to an embodiment of the present invention, the abbe number of the third lens is 30 or less, and the abbe number of the fourth lens is 70 or more. Therefore, purple fringing and near infrared aberration can be effectively balanced by using the ultra-low dispersion glass material.
According to one scheme of the invention, the relation between the distance BFL from the center of the image plane of the sixth lens to the image plane and the effective focal length f of the optical system and the total length TTL of the optical system is reasonably set, so that the size requirement of a mainstream camera can be met, and the miniaturization characteristic of the optical system can be met.
According to one aspect of the present invention, the optical system can be made more compact by appropriately setting the air intervals between the first lens and the second lens and between the fourth lens and the fifth lens.
According to one scheme of the invention, by reasonably setting the relation between the curvature radius of the fourth lens and the curvature radius of the fifth lens, the optical system structure is more compact, light can stably pass through the two lenses, and the tolerance sensitivity of the optical system is reduced.
Drawings
Fig. 1 is a schematic diagram showing a configuration of an optical system according to a first embodiment of the present invention;
FIG. 2 schematically shows an MTF plot for an optical system according to a first embodiment of the present invention;
FIG. 3 is a Through-Focus-MTF plot schematically illustrating an optical system frequency of 200lp/mm in accordance with a first embodiment of the present invention;
FIG. 4 is a Through-Focus-MTF graph schematically showing the frequency of 120lp/mm at a low temperature of-40 ℃ in the optical system according to the first embodiment of the present invention;
FIG. 5 is a Through-Focus-MTF plot schematically showing the frequency of 120lp/mm at a high temperature of 80 ℃ for an optical system according to a first embodiment of the present invention;
fig. 6 is a schematic diagram showing a configuration of an optical system according to a second embodiment of the present invention;
FIG. 7 schematically shows an MTF plot for an optical system according to a second embodiment of the present invention;
FIG. 8 is a Through-Focus-MTF plot schematically illustrating an optical system frequency of 200lp/mm in accordance with a second embodiment of the present invention;
FIG. 9 is a Through-Focus-MTF graph schematically showing the frequency of 120lp/mm at a low temperature of-40 ℃ in an optical system according to a second embodiment of the present invention;
FIG. 10 is a Through-Focus-MTF graph schematically showing the frequency of 120lp/mm at a high temperature of 80 ℃ in an optical system according to a second embodiment of the present invention;
fig. 11 is a schematic diagram showing a configuration of an optical system according to a third embodiment of the present invention;
FIG. 12 schematically shows an MTF chart of an optical system according to a third embodiment of the present invention;
FIG. 13 is a Through-Focus-MTF plot schematically showing an optical system frequency of 200lp/mm in accordance with a third embodiment of the present invention;
FIG. 14 is a Through-Focus-MTF graph schematically showing the frequency of 120lp/mm at a low temperature of-40 ℃ in an optical system according to a third embodiment of the present invention;
FIG. 15 is a Through-Focus-MTF graph schematically showing the frequency of 120lp/mm at a high temperature of 80 ℃ in an optical system according to a third embodiment of the present invention;
fig. 16 is a schematic diagram showing a configuration of an optical system according to a fourth embodiment of the present invention;
fig. 17 schematically shows an MTF chart of an optical system of a fourth embodiment of the present invention;
FIG. 18 is a Through-Focus-MTF plot schematically showing an optical system frequency of 200lp/mm in accordance with a fourth embodiment of the present invention;
FIG. 19 is a Through-Focus-MTF graph schematically showing the frequency of 120lp/mm at a low temperature of-40 ℃ in an optical system according to a fourth embodiment of the present invention;
FIG. 20 is a Through-Focus-MTF graph schematically showing a frequency of 120lp/mm at a high temperature of 80 ℃ in an optical system according to a fourth 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 optical system of the present invention includes, arranged in order from an object side to an image side along an optical axis: a first lens L1 having negative power, a second lens L2 having negative power, a third lens L3 having positive power or negative power, a fourth lens L4 having positive power, a fifth lens L5 having negative power, and a sixth lens L6 having positive power. The stop STO is arranged between the second lens L2 and the third lens L3 or between the third lens L3 and the fourth lens L4, and different stop positions can realize different light interception positions and adjustment of chief ray incidence angles, so that light rays can smoothly pass through the optical system, and the tolerance sensitivity of the whole optical system is reduced. The first lens element L1 is a concave-convex spherical or aspherical lens element, the second lens element L2 is an aspherical lens element having a concave object-side surface, the third lens element L3 is an aspherical lens element having a convex object-side surface, the fourth lens element L4 is a biconvex spherical lens element, the fifth lens element L5 is an aspherical lens element having a concave image-side surface, and the sixth lens element L6 is a biconvex aspherical lens element. The first lens L1 is a plastic lens or a glass lens, the fourth lens L1 is a glass lens, and the second lens L2, the third lens L3, the fifth lens L5 and the sixth lens L6 are plastic lenses.
In the invention, the Abbe number Vd of at least one lens of the first lens L1, the second lens L2 and the fourth lens L4 is not less than 50. Thus, through the use of the low-dispersion material, chromatic aberration correction can be better realized. The focal length f1 of the first lens L1, the focal length f3 of the third lens L3, the focal length f4 of the fourth lens L4, the focal length f5 of the fifth lens L5, the focal length f6 of the sixth lens L6 and the effective focal length f of the optical system satisfy the following relations, respectively: f1/f is more than or equal to-2 and less than or equal to-1.5; | f3/f | is more than or equal to 3.0 and less than or equal to 152; f4/f is more than or equal to 1.8 and less than or equal to 2.4; f5/f is not less than-2 and is not less than-3.3; f6/f is more than or equal to 1.5 and less than or equal to 2.3. Therefore, through the combination of the focal length sections, the effective correction of the aberration can be realized, so that the optical system meets the characteristic of high resolution, and simultaneously meets the day and night confocal and high and low temperature non-virtual focus. The Abbe number Vd3 of the third lens L3 is not more than 30, and the Abbe number Vd4 of the fourth lens L4 is not less than 70. Therefore, the ultra-low dispersion glass material (the fourth lens) is used in the invention, and the purple fringing and near infrared aberration can be effectively balanced. The distance BFL from the optical axis center of the image side surface of the sixth lens L6 to the image surface and the effective focal length f of the optical system respectively satisfy the following relations with the total length TTL of the optical system: BFL/TTL is more than or equal to 0.23 and less than or equal to 0.33; TTL/f is more than or equal to 6.6 and less than or equal to 7.5. According to the setting, the size requirement of the mainstream camera can be met, and the miniaturization characteristic of the optical system can be met. The air interval G12 between the first lens L1 and the second lens L2, and the air interval G45 between the fourth lens L4 and the fifth lens L5 satisfy the following relational expressions: G12/G45 is more than or equal to 20 and less than or equal to 45, and the setting of the interval can make the structure of the optical system more compact. The radius of curvature R9 of the image-side surface of the fourth lens L4 and the radius of curvature R10 of the object-side surface of the fifth lens L5 satisfy the following relationship: the absolute value of R10/R9 is more than or equal to 1.5 and less than or equal to 65. Satisfying the relationship can make the structure of the optical system more compact, and make the light pass through the two lenses stably, reduce the tolerance sensitivity of the optical system.
Therefore, the optical system adopts a scheme of mixing the glass lens and the plastic lens for use and reasonably configures the focal power and the concave-convex property of each lens, can realize the confocal of visible light and infrared light, and effectively reduces the cost of the optical system. In addition, the coke can be prevented from being burnt at the temperature of between 40 ℃ below zero and 80 ℃, and the method is suitable for different environments. The maximum aperture FNO1.6 can be realized, the resolution power can reach 8 million pixels, and the imaging target surface can reach 1/2.5 ". And the main ray angle CRA of the maximum view field of the optical system is less than or equal to 15 degrees, the sensor can be adapted to a plurality of sensors, the application prospect is wide, and the market competitiveness is improved. Image capturing with an object-side field angle of 150 ° can also be achieved.
The optical system of the present invention will be described in detail in four embodiments, where S0, S2, … and Sn denote the respective surfaces of the optical system, the object surface may be denoted as OBJ, the stop surface may be denoted as STO and the image surface may be denoted as IMA. The parameter settings of the embodiments specifically satisfying the above conditional expressions are shown in table 1 below:
table 1 the aspherical surface of the optical system of the present invention satisfies the following formula:
in the formula, z is the axial distance from the curved surface to the vertex at the position which is along the direction of the optical axis and is vertical to the optical axis by the height h; c represents the curvature at the apex of the aspherical surface; k is a conic coefficient; a. the4、A6、A8、A10、A12、A14、A16The aspherical coefficients of the fourth, sixth, eighth, tenth, twelfth, fourteenth and sixteenth orders are expressed respectively.
The first embodiment:
referring to fig. 1, in the present embodiment, a stop STO is located between the third lens L3 and the fourth lens L4, and the third lens L3 has positive optical power. The optical system of the present embodiment has parameters F #: 1.75; total length of optical system: 22.4 mm; the field angle: 135 deg.
The parameters related to each lens of the optical system of the present embodiment, including the surface type, the radius of curvature, the thickness, the refractive index of the material, and the abbe number, are as shown in table 2 below:
| number of noodles | Surface type | R value | Thickness of | Refractive index | Abbe number |
| S0(OBJ) | Spherical surface | Infinity | Infinity | ||
| S1 | Spherical surface | 12.373 | 1.53 | 1.73 | 51.5 |
| S2 | Spherical surface | 3.136 | 2.28 | ||
| S3 | Aspherical surface | -3.479 | 0.79 | 1.54 | 55.7 |
| S4 | Aspherical surface | -50.565 | 0.08 | ||
| S5 | Aspherical surface | 11.339 | 4.72 | 1.64 | 23.1 |
| S6 | Aspherical surface | -14.08 | 0.36 | ||
| S7(STO) | Spherical surface | Infinity | -0.21 | ||
| S8 | Spherical surface | 6.221 | 3 | 1.46 | 90.2 |
| S9 | Spherical surface | -6.221 | 0.09 | ||
| S10 | Aspherical surface | -382.751 | 0.7 | 1.64 | 23.1 |
| S11 | Aspherical surface | 4.697 | 0.19 | ||
| S12 | Aspherical surface | 4.326 | 2.03 | 1.54 | 55.7 |
| S13 | Aspherical surface | -7.02 | 1.62 | ||
| S14 | Spherical surface | Infinity | 0.8 | 1.52 | 64.2 |
| S15 | Spherical surface | Infinity | 4.42 | ||
| S16(IMA) | Spherical surface | Infinity | - | - | - |
TABLE 2
The aspherical surface coefficients of the aspherical lenses in this embodiment are shown in table 3 below:
TABLE 3
Where K is a conic constant of the surface, and A, B, C, D, E are aspheric coefficients of fourth, sixth, eighth, tenth, and twelfth orders, respectively.
With reference to fig. 2 to 5, the optical system of the present embodiment can realize confocal measurement of visible light and infrared light, thereby effectively reducing the cost of the optical system. In addition, the coke can be prevented from being burnt at the temperature of between 40 ℃ below zero and 80 ℃, and the method is suitable for different environments. The maximum aperture FNO1.6 can be realized, and the resolution can reach 8 million pixels.
The second embodiment:
referring to fig. 6, in the present embodiment, a stop STO is located between the third lens L3 and the fourth lens L4, and the third lens L3 has a negative power. The parameters of the optical system of the present embodiment are, F #: 1.6; total length of optical system: 22.46 mm; the field angle: 135 deg.
The parameters relating to each lens of the optical system of the present embodiment, including the surface type, the radius of curvature, the thickness, the refractive index of the material, and the abbe number, are shown in table 4 below:
TABLE 4
The aspherical surface coefficients of the aspherical lenses in this embodiment are shown in table 5 below:
TABLE 5
Where K is a conic constant of the surface, and A, B, C, D, E are aspheric coefficients of fourth, sixth, eighth, tenth, and twelfth orders, respectively.
With reference to fig. 7 to 10, the optical system of the present embodiment can realize confocal measurement of visible light and infrared light, thereby effectively reducing the cost of the optical system. In addition, the coke can be prevented from being burnt at the temperature of between 40 ℃ below zero and 80 ℃, and the method is suitable for different environments. The maximum aperture FNO1.6 can be realized, and the resolution can reach 8 million pixels.
Third embodiment:
referring to fig. 11, in the present embodiment, a stop STO is located between the third lens L3 and the fourth lens L4, and the third lens L3 has a negative power. The optical system of the present embodiment has parameters F #: 1.6; total length of optical system: 22.46 mm; the field angle: 140 degrees.
The parameters related to each lens of the optical system of the present embodiment, including the surface type, the radius of curvature, the thickness, the refractive index of the material, and the abbe number, are as shown in table 6 below:
| number of noodles | Surface type | R value | Thickness of | Refractive index | Abbe number |
| S0(OBJ) | Spherical surface | Infinity | Infinity | ||
| S1 | Spherical surface | 19.879 | 0.65 | 1.69 | 55.5 |
| S2 | Spherical surface | 3.151 | 2.76 | ||
| S3 | Aspherical surface | -3.741 | 3.09 | 1.54 | 55.9 |
| S4 | Aspherical surface | -4.985 | 0.08 | ||
| S5 | Aspherical surface | 6.576 | 3.5 | 1.64 | 23.1 |
| S6 | Aspherical surface | 5.093 | 0.59 | ||
| S7(STO) | Spherical surface | Infinity | -0.45 | ||
| S8 | Spherical surface | 4.911 | 3.75 | 1.46 | 90.2 |
| S9 | Spherical surface | -4.911 | 0.08 | ||
| S10 | Aspherical surface | 8.801 | 0.65 | 1.61 | 25.6 |
| S11 | Aspherical surface | 3.443 | 0.12 | ||
| S12 | Aspherical surface | 4.611 | 2.09 | 1.54 | 55.9 |
| S13 | Aspherical surface | -10.639 | 1.62 | ||
| S14 | Spherical surface | Infinity | 0.8 | 1.52 | 64.2 |
| S15 | Spherical surface | Infinity | 3.13 | ||
| S16(IMA) | Spherical surface | Infinity | - | - | - |
TABLE 6
The aspherical surface coefficients of the aspherical lenses in this embodiment are shown in table 7 below:
TABLE 7
Where K is a conic constant of the surface, and A, B, C, D, E are aspheric coefficients of fourth, sixth, eighth, tenth, and twelfth orders, respectively.
With reference to fig. 12 to 15, the optical system of the present embodiment can realize confocal measurement of visible light and infrared light, thereby effectively reducing the cost of the optical system. In addition, the coke can be prevented from being burnt at the temperature of between 40 ℃ below zero and 80 ℃, and the method is suitable for different environments. The maximum aperture FNO1.6 can be realized, and the resolution can reach 8 million pixels.
Fourth embodiment:
referring to fig. 16, in the present embodiment, a stop STO is located between the second lens L2 and the third lens L3, and the third lens L3 has a negative power. The parameters of the optical system of the present embodiment are, F #: 1.6; total length of optical system: 22.35 mm; the field angle: 150 degrees.
The parameters related to each lens of the optical system of the present embodiment, including the surface type, the radius of curvature, the thickness, the refractive index of the material, and the abbe number, are as shown in table 8 below:
TABLE 8
The aspherical coefficients of the aspherical lenses in this embodiment are shown in table 9 below:
TABLE 9
Where K is a conic constant of the surface, and A, B, C, D, E are aspheric coefficients of fourth, sixth, eighth, tenth, and twelfth orders, respectively.
With reference to fig. 17 to 20, the optical system of the present embodiment can realize confocal measurement of visible light and infrared light, thereby effectively reducing the cost of the optical system. In addition, the coke can be prevented from being burnt at the temperature of between 40 ℃ below zero and 80 ℃, and the method is suitable for different environments. The maximum aperture FNO1.6 can be realized, and the resolution can reach 8 million pixels.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and it is 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 within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An optical system comprising, arranged in order from an object side to an image side along an optical axis: a first lens (L1) having negative optical power, a second lens (L2) having negative optical power, a third lens (L3) having positive or negative optical power, a fourth lens (L4) having positive optical power, a fifth lens (L5) having negative optical power, and a sixth lens (L6) having positive optical power.
2. The optical system according to claim 1, further comprising a Stop (STO) located between the second lens (L2) and the third lens (L3) or between the third lens (L3) and the fourth lens (L4).
3. The optical system according to claim 1, wherein the first lens (L1) is a spherical or aspherical lens of a concave-convex type, the second lens (L2) is an aspherical lens having a concave object-side surface, the third lens (L3) is an aspherical lens having a convex object-side surface, the fourth lens (L4) is a spherical lens of a biconvex type, the fifth lens (L5) is an aspherical lens having a concave image-side surface, and the sixth lens (L6) is an aspherical lens of a biconvex type.
4. The optical system according to claim 1, wherein the first lens (L1) is a plastic lens or a glass lens, the fourth lens (L1) is a glass lens, and the second lens (L2), the third lens (L3), the fifth lens (L5) and the sixth lens (L6) are plastic lenses.
5. The optical system according to any of claims 1-4, wherein at least one of the first lens (L1), the second lens (L2) and the fourth lens (L4) has an Abbe number Vd ≧ 50.
6. The optical system according to any of claims 1-4, wherein the focal length f1 of the first lens (L1), the focal length f3 of the third lens (L3), the focal length f4 of the fourth lens (L4), the focal length f5 of the fifth lens (L5), the focal length f6 of the sixth lens (L6) and the effective focal length f of the optical system satisfy the following relations, respectively:
-2≤f1/f≤-1.5；
3.0≤|f3/f|≤152；
1.8≤f4/f≤2.4；
-3.3≤f5/f≤-2；
1.5≤f6/f≤2.3。
7. an optical system according to any one of claims 1-4, characterized in that the third lens (L3) has an Abbe number Vd3 ≤ 30 and the fourth lens (L4) has an Abbe number Vd4 ≥ 70.
8. The optical system according to any one of claims 1-4, wherein a distance BFL from an image side optical axis center to an image plane of the sixth lens (L6) and an effective focal length f of the optical system respectively satisfy the following relations with a total length TTL of the optical system: BFL/TTL is more than or equal to 0.23 and less than or equal to 0.33; TTL/f is more than or equal to 6.6 and less than or equal to 7.5.
9. The optical system according to any of claims 1-4, wherein the air gap G12 between the first lens (L1) and the second lens (L2), and the air gap G45 between the fourth lens (L4) and the fifth lens (L5) satisfy the following relations: G12/G45 is more than or equal to 20 and less than or equal to 45.
10. The optical system according to any of claims 1-4, wherein the radius of curvature R9 of the image side of the fourth lens (L4) and the radius of curvature R10 of the object side of the fifth lens (L5) satisfy the following relation: the absolute value of R10/R9 is more than or equal to 1.5 and less than or equal to 65.
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| CN202110321024.7A CN112904539A (en) | 2021-03-25 | 2021-03-25 | Optical system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113805316A (en) * | 2021-10-15 | 2021-12-17 | 舜宇光学(中山)有限公司 | Fixed focus lens |
| CN115032773A (en) * | 2022-06-13 | 2022-09-09 | 舜宇光学(中山)有限公司 | Fixed focus lens |
| CN116908999A (en) * | 2023-09-14 | 2023-10-20 | 武汉宇熠科技有限公司 | Large wide-angle low-distortion video conference lens |
| CN117369100A (en) * | 2023-12-06 | 2024-01-09 | 江西联创电子有限公司 | Optical lens |
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2021
- 2021-03-25 CN CN202110321024.7A patent/CN112904539A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113805316A (en) * | 2021-10-15 | 2021-12-17 | 舜宇光学(中山)有限公司 | Fixed focus lens |
| CN115032773A (en) * | 2022-06-13 | 2022-09-09 | 舜宇光学(中山)有限公司 | Fixed focus lens |
| CN115032773B (en) * | 2022-06-13 | 2024-02-20 | 舜宇光学(中山)有限公司 | Fixed focus lens |
| CN116908999A (en) * | 2023-09-14 | 2023-10-20 | 武汉宇熠科技有限公司 | Large wide-angle low-distortion video conference lens |
| CN116908999B (en) * | 2023-09-14 | 2023-12-08 | 武汉宇熠科技有限公司 | Large wide-angle low-distortion video conference lens |
| CN117369100A (en) * | 2023-12-06 | 2024-01-09 | 江西联创电子有限公司 | Optical lens |
| CN117369100B (en) * | 2023-12-06 | 2024-03-29 | 江西联创电子有限公司 | Optical lens |
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