CN117308021B - Design method of projection lamp lens - Google Patents
Design method of projection lamp lens Download PDFInfo
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- CN117308021B CN117308021B CN202311296598.9A CN202311296598A CN117308021B CN 117308021 B CN117308021 B CN 117308021B CN 202311296598 A CN202311296598 A CN 202311296598A CN 117308021 B CN117308021 B CN 117308021B
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- 238000013461 design Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 23
- 230000003287 optical effect Effects 0.000 claims abstract description 28
- 238000003384 imaging method Methods 0.000 claims abstract description 17
- 239000011521 glass Substances 0.000 claims abstract description 15
- 239000004033 plastic Substances 0.000 claims abstract description 9
- 238000005286 illumination Methods 0.000 claims abstract description 8
- 230000005499 meniscus Effects 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 6
- 230000004075 alteration Effects 0.000 abstract description 19
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 13
- 201000009310 astigmatism Diseases 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 241001621399 Lampris Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
- F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
- F21S41/25—Projection lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—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
- G02B13/004—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 four lenses
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
- F21W2107/00—Use or application of lighting devices on or in particular types of vehicles
- F21W2107/10—Use or application of lighting devices on or in particular types of vehicles for land vehicles
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Lenses (AREA)
Abstract
The invention discloses a design method of a projection lamp lens, which comprises a projection imaging unit assembly, a projection source and an illumination unit assembly, wherein the projection source is positioned between the projection imaging unit assembly and the illumination unit assembly, and the projection imaging unit assembly sequentially comprises the following components from an object side to an image side along an optical axis: the first lens is provided with positive focal power, and the object side surface is a convex surface; the second lens is provided with negative focal power, is in a meniscus shape, has a concave object side surface and a convex image side surface; the third lens is provided with positive focal power, is in a meniscus shape, has a convex object side surface and a concave image side surface; a fourth lens with positive focal power, wherein the object side surface is a convex surface; the diaphragm is positioned in front of the second lens, the first lens is a glass lens, and the second lens, the third lens and the fourth lens are all plastic lenses. The lens has extremely small chromatic aberration of magnification and high definition, and the MTF is close to the diffraction limit, so that the effect of improving the performance and reducing the cost can be achieved.
Description
Technical Field
The present invention relates to the field of projection lamp lenses, and in particular, to a method for designing a projection lamp lens.
Background
When the automobile projection lamp is applied to the ground, the requirement on the imaging quality of projection is higher and higher. The farther the projection pattern of the projection lamp is, the larger the magnification, and the more obvious the flaws of the corresponding projection pattern are, the color separation phenomenon of yellow Lan Bian is often caused at the pattern boundary of some projection lamps at present, which is essentially caused by the chromatic aberration of the imaging lens end. In addition, because the projection lamp during operation, the light source can produce great heat to the inside temperature of projection lamp rises through a period, receives the temperature influence, and the projection imaging module of projection lamp is defocused, thereby leads to the definition of projection lamp to reduce. In addition, the vehicle may also suffer from poor definition under different external temperature conditions. This is a great challenge in projection lamp applications.
In addition, cost is an important factor of the projection lens, and the plastic lens is cheaper than the glass lens with the same caliber, and can adopt a free-form surface or an aspheric surface. However, the injection molded plastic lens has a remarkable disadvantage that the thermal stability is poor, and the refractive index and the thermal expansion coefficient are greatly changed along with the temperature, so that the optical performance of the lens is severely deteriorated under the high and low temperature environments if the design is improper. This is why the definition of the current projection lamp is not consistently clear under different temperature conditions. But plastic lenses have the advantage that the surface shape can have more design freedom, and are light in weight and lower in cost.
Therefore, it is necessary to provide a method, under the requirement of wide application range of the temperature of the automobile, so that the projection lamp can fully utilize the advantages of the plastic lens and the glass lens, avoid the defects of the plastic lens and the glass lens, improve the definition, reduce the chromatic aberration and enable the projection lamp to have stable performance under different application ranges of the temperature.
Disclosure of Invention
The invention mainly aims to provide a design method of a projection lamp lens, wherein a first lens is a glass lens and bears most of optical power, a second lens, a third lens and a fourth lens are mainly used for correcting advanced aberration of a system, and the total optical power is small, so that the influence of temperature is extremely small, the change of the optical performance of the glass lens of the first lens relative to the temperature is small, and the problem in the background technology can be effectively solved.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the design method of the projection lamp lens comprises a projection imaging unit assembly, a projection source and an illumination unit assembly, wherein the projection source is positioned between the projection imaging unit assembly and the illumination unit assembly, and the projection imaging unit assembly sequentially comprises the following steps from an object side to an image side along an optical axis:
the first lens is provided with positive focal power, and the object side surface is a convex surface;
the second lens is provided with negative focal power, is in a meniscus shape, has a concave object side surface and a convex image side surface;
the third lens is provided with positive focal power, is in a meniscus shape, has a convex object side surface and a concave image side surface;
a fourth lens with positive focal power, wherein the object side surface is a convex surface;
The diaphragm is positioned in front of the second lens;
the power of the first lens accounts for the formula of the power contribution of the system:
The ratio of I f1 to EFL/EFL is <0.15, wherein f1 is the focal length of the first lens, and EFL is the effective focal length of the lens system;
The formula of the total system length of the lens:
OAL/EFL<1.8；
wherein OAL is the total system length of the lens;
the light path form and the total length distribution of the system meet the following conditions:
T12>T23，T34>T23，T12>BFL，T34>BFL；
wherein T12 is the center-to-center distance between the first lens and the second lens, T23 is the center-to-center distance between the second lens and the third lens, T34 is the center-to-center distance between the third lens and the fourth lens, and BFL is the back intercept.
Further, the first lens is a glass lens.
Further, the second lens, the third lens and the fourth lens are all plastic lenses.
Further, the second lens uses a lens with an Abbe number of an optical material smaller than 30.
Further, the abbe number of the optical materials of the first lens and the third lens is larger than 45.
Further, the image side surface of the first lens is a plane.
Compared with the prior art, the invention has the following beneficial effects:
1. The lens has extremely small chromatic aberration of magnification, high definition and MTF approaching to the diffraction limit.
2. The invention has excellent thermal stability, the first lens is a glass lens, and bears most of focal power, the second lens, the third lens and the fourth lens are mainly used for correcting the advanced aberration of the system, and the total focal power is small, so that the influence of temperature is little, the change of the optical performance of the glass lens of the first lens relative to the temperature is small, and the lens can be suitable for the field with wide application range of temperature due to combined application.
3. The invention is a glass-plastic mixed design, and has the effects of improving the performance and reducing the cost.
Drawings
Fig. 1 is a schematic diagram of a design method of a projection lamp lens according to the present invention.
Fig. 2 is a design diagram of embodiment 1 of a design method of a projection lamp lens according to the present invention.
Fig. 3 is a transfer function diagram of an embodiment 1 of a design method of a projection lamp lens according to the present invention.
Fig. 4 is a diagram showing field curvature and distortion of an embodiment 1 of a method for designing a lens of a projection lamp according to the present invention.
Fig. 5 is a graph of chromatic aberration of magnification in embodiment 1 of a design method of a projection lamp lens according to the present invention.
Fig. 6 is a design diagram of embodiment 2 of a design method of a projection lamp lens according to the present invention.
Fig. 7 is a transfer function diagram of embodiment 2 of a design method of a projection lamp lens according to the present invention.
Fig. 8 is a diagram showing field curvature and distortion of an embodiment 2 of a method for designing a lens of a projection lamp according to the present invention.
Fig. 9 is a graph of chromatic aberration of magnification in embodiment 2 of a method for designing a lens of a projection lamp according to the present invention.
Fig. 10 is a diagram of a design of a projection lamp lens according to embodiment 3 of the present invention.
Fig. 11 is a transfer function diagram of embodiment 3 of a design method of a projection lamp lens according to the present invention.
Fig. 12 is a diagram showing field curvature and distortion of embodiment 3 of a method for designing a lens of a projection lamp according to the present invention.
Fig. 13 is a graph of a chromatic aberration of magnification of embodiment 3 of a design method of a lens of a projection lamp according to the present invention.
In the figure: 1. a first lens; 2. a second lens; 3. a third lens; 4. a fourth lens; 5. a diaphragm; 6. a projection imaging unit assembly; 7. a projection source; 8. a lighting unit assembly.
Detailed Description
The invention is further described in connection with the following detailed description, in order to make the technical means, the creation characteristics, the achievement of the purpose and the effect of the invention easy to understand.
As shown in fig. 1-13, a design method of a projection lamp lens includes a projection imaging unit assembly 6, a projection source 7 and an illumination unit assembly 8, wherein the projection source 7 is located between the projection imaging unit assembly 6 and the illumination unit assembly 8, and the projection imaging unit assembly 6 sequentially includes, from an object side to an image side along an optical axis:
A first lens 1 having positive optical power, and an object side surface being a convex surface;
the second lens element 2 with negative focal power has a meniscus shape, a concave object-side surface and a convex image-side surface;
The third lens element 3 with positive refractive power has a meniscus shape, a convex object-side surface and a concave image-side surface;
a fourth lens 4 with positive optical power, and an object side surface is a convex surface;
The diaphragm 5 is positioned in front of the second lens 2;
The power of the first lens 1 accounts for the formula of the power contribution of the system:
The ratio of I f1 to EFL/EFL is <0.15, wherein f1 is the focal length of the first lens 1, and EFL is the effective focal length of the lens system;
The formula of the total system length of the lens:
OAL/EFL<1.8；
the OAL is the total system length of the lens, and the constraint limits the total system length, so that the projection imaging lens has a compact overall structure;
the light path form and the total length distribution of the system meet the following conditions:
T12>T23，T34>T23，T12>BFL，T34>BFL；
Wherein T12 is the center-to-center distance between the first lens 1 and the second lens 2, T23 is the center-to-center distance between the second lens 2 and the third lens 3, T34 is the center-to-center distance between the third lens 3 and the fourth lens 4, BFL is the back intercept, and the distances of the lenses define the optical path configuration and the overall system length distribution, thereby reducing the aberration enhancing performance.
The first lens 1 is a glass lens.
The second lens 2, the third lens 3 and the fourth lens 4 are all plastic lenses.
And the abbe number of the optical material used for the second lens 2 is less than 30.
The abbe number of the optical materials of the first lens 1 and the third lens 3 is larger than 45.
The image side surface of the first lens 1 is a plane.
Example 1
The design diagram comprises the following steps: as in fig. 2, mtf graph: as shown in fig. 3, the astigmatism curve and the distortion curve are as follows: fig. 4, a chromatic aberration of magnification curve such as: fig. 5.
Table 1 is the design parameters of the first embodiment, and table 2 is the corresponding aspheric coefficients; table 1
Table 2
| Surface serial number | k | A | B | C |
| S4 | -3.39E+00 | 1.33E-03 | 1.43E-02 | -4.86E-03 |
| S5 | -3.29E+00 | 2.89E-02 | 0.00E+00 | 0.00E+00 |
| S6 | -3.37E+00 | 3.45E-02 | -1.45E-02 | 0.00E+00 |
| S7 | -1.12E+00 | 1.84E-02 | -1.37E-02 | 0.00E+00 |
| S8 | 0.00E+00 | 5.64E-03 | 1.93E-03 | 0.00E+00 |
| S9 | 0.00E+00 | -1.90E-02 | 0.00E+00 | 0.00E+00 |
The expression of the aspherical surface is as follows:
Wherein z is the sagittal height of the aspheric position at the r position; c is the paraxial curvature of the aspherical surface, c=1/R, (i.e., paraxial curvature c is the inverse of the radius of curvature R of the surface); k is a conic coefficient; a, b., J is a higher order term coefficient.
Other system parameters of the design are: table 3;
TABLE 3
| Parameters (parameters) | Equivalent focal length EFL (mm) | f1(mm) | f2(mm) | f3(mm) | f4(mm) | BFL(mm) | EPD(mm) | FOV(deg) | OAL(mm) |
| Numerical value | 5.02 | 4.55 | -3.77 | 5.19 | 13.60 | 0.37 | 1.9 | 15 | 6.56 |
Satisfying the relation; table 4;
Table 4
| Constraint conditions | Design results |
| |f1-EFL|/EFL<0.15 | I f 1-EFL/efl=0.094, is known to satisfy |
| OAL/EFL<1.8 | OAL/EFL= 1.306, is known to satisfy |
| T12＞T23 | From the design parameter table, it is known that the following is satisfied |
| T34＞T23 | From the design parameter table, it is known that the following is satisfied |
| T12＞BFL | From the design parameter table, it is known that the following is satisfied |
| T34＞BFL | From the design parameter table, it is known that the following is satisfied |
The diaphragm 5 of the present design is arranged in front of the first lens 1; as can be seen from fig. 3, the clarity of the present embodiment 1 is very high, the MTF value is close to the diffraction limit, the chromatic aberration of magnification is small, less than 1um, as can be seen from the chromatic aberration of magnification curve of fig. 5, and the first lens 1 is provided as a glass lens and has optical power similar to that of the system, so that the optical performance is stable at different temperatures.
Example two
The design diagram comprises the following steps: as in fig. 6, the mtf graph is as follows: fig. 7, astigmatism curves and distortion curves such as: fig. 8, a chromatic aberration of magnification curve such as: fig. 9.
Table 5 is the design parameters of the first embodiment, and table 6 is the corresponding aspheric coefficients;
Table 5
| Surface serial number | Surface type | Radius of curvature R (mm) | Thickness (mm) | Refractive index | Abbe number |
| S1 | Spherical surface | 2.253 | 0.950 | 1.593 | 68.3 |
| S2 | Spherical surface | Infinity is provided | 0.159 | ||
| S3(Stop) | Spherical surface | Infinity is provided | 0.775 | ||
| S4 | Aspherical surface | -0.660 | 0.358 | 1.635 | 24.0 |
| S5 | Aspherical surface | -1.344 | 0.232 | ||
| S6 | Aspherical surface | 0.847 | 0.640 | 1.535 | 56.0 |
| S7 | Aspherical surface | 1.176 | 1.079 | ||
| S8 | Aspherical surface | 3.186 | 0.950 | 1.535 | 56.0 |
| S9 | Aspherical surface | 55.000 | 0.496 | ||
| S10 | Spherical surface | Infinity is provided | -0.020 |
The expression of the aspherical surface is as follows:
Wherein z is the sagittal height of the aspheric position at the r position; c is the paraxial curvature of the aspherical surface, c=1/R, (i.e., paraxial curvature c is the inverse of the radius of curvature R of the surface); k is a conic coefficient; a, b., J is a higher order term coefficient.
Table 6
Other system parameters of the design are: table 7;
Table 7
| Parameters (parameters) | Equivalent focal length EFL (mm) | f1(mm) | f2(mm) | f3(mm) | f4(mm) | BFL(mm) | EPD(mm) | FOV(deg) | OAL(mm) |
| Numerical value | 4.08 | 3.79 | -2.54 | 3.35 | 6.25 | 0.48 | 1.52 | 15 | 5.62 |
The following relation is satisfied: table 8;
Table 8
| Constraint conditions | Design results |
| |f1-EFL|/EFL<0.15 | I f 1-EFL/efl=0.072, known to satisfy |
| OAL/EFL<1.8 | OAL/EFL=1.377, is known to be satisfied |
| T12＞T23 | From the design parameter table, it is known that the following is satisfied |
| T34＞T23 | From the design parameter table, it is known that the following is satisfied |
| T12＞BFL | From the design parameter table, it is known that the following is satisfied |
| T34＞BFL | From the design parameter table, it is known that the following is satisfied |
The diaphragm 5 of the present design is arranged in front of the second lens 2; the image plane of the first lens 1 is a plane, and the processing cost of the glass lens is easily reduced. As can be seen from fig. 7, the clarity of the present embodiment 2 is very high, the MTF value is close to the diffraction limit, the chromatic aberration of magnification is small, less than 1um, as can be seen from the chromatic aberration of magnification curve of fig. 9, and the first lens 1 is provided as a glass lens and has optical power similar to that of the system, so that the optical performance is stable at different temperatures.
Example III
The design diagram comprises the following steps: as in fig. 10, mtf graph: as in fig. 11, astigmatism curves and distortion curves: as shown in fig. 12, a chromatic aberration of magnification curve: as shown in fig. 13.
Table 9 is the design parameters of the first embodiment, and table 10 is the corresponding aspheric coefficients;
Table 9
Table 10
| Surface serial number | k | A | B | C |
| S4 | -3.33E+00 | -1.39E-02 | 3.49E-02 | -1.57E-02 |
| S5 | -3.53E+00 | 2.82E-02 | 0.00E+00 | 0.00E+00 |
| S6 | -3.23E+00 | 4.39E-02 | -1.77E-02 | 0.00E+00 |
| S7 | -1.28E+00 | 2.77E-02 | -2.11E-02 | 0.00E+00 |
| S8 | 0.00E+00 | 1.82E-02 | 4.20E-04 | 0.00E+00 |
| S9 | 0.00E+00 | -1.90E-02 | 0.00E+00 | 0.00E+00 |
The expression of the aspherical surface is as follows:
Wherein z is the sagittal height of the aspheric position at the r position; c is the paraxial curvature of the aspherical surface, c=1/R, (i.e., paraxial curvature c is the inverse of the radius of curvature R of the surface); k is a conic coefficient; a, b., J is a higher order term coefficient.
Other system parameters of the design are: table 11;
Table 11
| Parameters (parameters) | Equivalent focal length EFL (mm) | f1(mm) | f2(mm) | f3(mm) | f4(mm) | BFL(mm) | EPD(mm) | FOV(deg) | OAL(mm) |
| Numerical value | 5.02 | 4.75 | -3.28 | 4.16 | 9.04 | 0.32 | 1.9 | 15 | 6.85 |
The following relation is satisfied: table 12;
Table 12
The diaphragm 5 of the present design is arranged in front of the second lens 2; as can be seen from fig. 11, the clarity of the present embodiment 3 is very high, the MTF value is close to the diffraction limit, the chromatic aberration of magnification is small, less than 1um, as seen from the chromatic aberration of magnification curve of fig. 13, and the first lens 1 is provided as a glass lens and has optical power similar to that of the system, so that the optical performance is stable at different temperatures.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (3)
1. The design method of the projection lamp lens comprises a projection imaging unit assembly (6), a projection source (7) and an illumination unit assembly (8), and is characterized in that the projection source (7) is positioned between the projection imaging unit assembly (6) and the illumination unit assembly (8), and the projection imaging unit assembly (6) sequentially comprises from an object side to an image side along an optical axis:
a first lens (1) having positive optical power, and the object side surface being a convex surface;
a second lens (2) having negative optical power and being of a meniscus shape, the object side surface being a concave surface and the image side surface being a convex surface;
a third lens (3) having positive optical power and being of a meniscus shape, the object side surface being a convex surface and the image side surface being a concave surface;
A fourth lens (4) having positive optical power, and the object side surface being a convex surface;
The diaphragm (5) is positioned in front of the second lens (2);
The power of the first lens (1) accounts for the formula of the power contribution of the system:
the ratio of I f1 to EFL/EFL is <0.15, wherein f1 is the focal length of the first lens (1), and EFL is the effective focal length of the lens system;
The formula of the total system length of the lens:
OAL/EFL<1.8；
wherein OAL is the total system length of the lens;
the light path form and the total length distribution of the system meet the following conditions:
T12>T23，T34>T23，T12>BFL，T34>BFL；
wherein T12 is the center-to-center distance between the first lens (1) and the second lens (2), T23 is the center-to-center distance between the second lens (2) and the third lens (3), T34 is the center-to-center distance between the third lens (3) and the fourth lens (4), and BFL is the back intercept;
The first lens (1) is a glass lens, the second lens (2), the third lens (3) and the fourth lens (4) are all plastic lenses, and the Abbe number of optical materials used by the second lens (2) is smaller than 30.
2. The method for designing a lens of a projection lamp according to claim 1, wherein: the Abbe number of the optical material of the first lens (1) and the third lens (3) is larger than 45.
3. The method for designing a lens of a projection lamp according to claim 1, wherein: the image side surface of the first lens (1) is a plane.
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| CN202311296598.9A CN117308021B (en) | 2023-10-09 | 2023-10-09 | Design method of projection lamp lens |
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| CN117308021B true CN117308021B (en) | 2024-06-07 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112882211A (en) * | 2021-01-18 | 2021-06-01 | 广东烨嘉光电科技股份有限公司 | Large-aperture four-piece optical lens |
| CN215416079U (en) * | 2021-09-02 | 2022-01-04 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN115268009A (en) * | 2022-09-28 | 2022-11-01 | 南昌欧菲光电技术有限公司 | Optical system and head-mounted device |
| CN115574285A (en) * | 2022-09-20 | 2023-01-06 | 广东烨嘉光电科技股份有限公司 | Projection lamp module for vehicle |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112882211A (en) * | 2021-01-18 | 2021-06-01 | 广东烨嘉光电科技股份有限公司 | Large-aperture four-piece optical lens |
| CN215416079U (en) * | 2021-09-02 | 2022-01-04 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN115574285A (en) * | 2022-09-20 | 2023-01-06 | 广东烨嘉光电科技股份有限公司 | Projection lamp module for vehicle |
| CN115268009A (en) * | 2022-09-28 | 2022-11-01 | 南昌欧菲光电技术有限公司 | Optical system and head-mounted device |
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