CN221039595U - Projection optical system and car lamp using same - Google Patents
Projection optical system and car lamp using same Download PDFInfo
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- CN221039595U CN221039595U CN202323216918.3U CN202323216918U CN221039595U CN 221039595 U CN221039595 U CN 221039595U CN 202323216918 U CN202323216918 U CN 202323216918U CN 221039595 U CN221039595 U CN 221039595U
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- 230000003287 optical effect Effects 0.000 title claims abstract description 64
- 239000011521 glass Substances 0.000 claims abstract description 143
- 239000006185 dispersion Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 8
- 230000005499 meniscus Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 3
- 230000004075 alteration Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000005286 illumination Methods 0.000 description 4
- 238000003384 imaging method Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 210000003128 head Anatomy 0.000 description 1
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Abstract
The utility model discloses a projection optical system and a car lamp using the same, comprising: a first glass lens with positive focal power, a second glass lens with positive focal power, a third glass lens with negative focal power, a fourth glass lens with positive focal power, a fifth glass lens and an object plane LED light source are sequentially arranged from the image side to the object side along the optical axis direction; the image side surface of the first glass lens, the image side surface of the second glass lens, the image side surface and the object side surface of the fourth glass lens and the image side surface of the fifth glass lens are convex surfaces along the direction from the image side to the object side; the object side surface of the first glass lens, the object side surface of the second glass lens, the image side surface and the object side surface of the third glass lens and the object side surface of the fifth glass lens are all concave surfaces; and an vignetting diaphragm is arranged on the image side surface of the first glass lens; and an aperture stop is arranged on the image side surface of the fourth glass lens; the F-number of the projection optical system is less than 0.67.
Description
Technical Field
The utility model relates to the technical field of car lamps, in particular to a projection optical system and a car lamp using the same.
Background
As a "glasses" for night driving, the effect of the head lamp on driving safety is very important, and the function is gradually developed from single illumination to self-adaptive high beam and intelligent and pixelized projection lamp.
Currently, pixelized and intelligent projection lamps mainly use Digital Light Processing (DLP) projection technology and high-pixel LEDs. The DLP technology has been applied in the projector field for many years, and as a projection lamp, high definition projection can be realized, but the system has a complex composition, including an illumination system, a light modulator (DMD), an imaging system and other main parts. For the technical scheme, the light source utilization rate of the DLP is lower due to the limitation of an optical principle, and the requirements on the space, structural design, processing and assembly process of the car lamp are higher. And for the condition of realizing projection illumination by utilizing high-pixel LEDs, the corresponding car lamp has compact structure, lower cost and high light source utilization rate, and can meet the intelligent and pixelized illumination requirements.
Based on the above situation, the high-pixel LED generally adopted in the prior art is generally a four-plate glass-plastic mixed architecture, and the aspheric surface of the plastic lens is utilized to correct the aberration, so that the F-number (focal length: entrance pupil diameter) of the system is generally greater than 0.75 to obtain a better image quality result, but through practical use research, the system performance of the high-pixel LED under the structure is seriously reduced under the high-temperature environment, and the overall light efficiency is lower.
Disclosure of utility model
The first objective of the present utility model is to provide a projection optical system, which solves the technical problem of achieving both compactness and high light efficiency of the overall structure of the projection optical system.
The second object of the present utility model is to provide a vehicle lamp, which solves the technical problem of compact and high light efficiency of the whole vehicle lamp.
The projection optical system of the present utility model is realized as follows:
A projection optical system, comprising: a first glass lens with positive focal power, a second glass lens with positive focal power, a third glass lens with negative focal power, a fourth glass lens with positive focal power, a fifth glass lens and an object plane LED light source are sequentially arranged from the image side to the object side along the optical axis direction; wherein the method comprises the steps of
The image side surface of the first glass lens, the image side surface of the second glass lens, the image side surface and the object side surface of the fourth glass lens and the image side surface of the fifth glass lens are convex surfaces along the direction from the image side to the object side; the object side surface of the first glass lens, the object side surface of the second glass lens, the image side surface and the object side surface of the third glass lens and the object side surface of the fifth glass lens are all concave surfaces; and
An vignetting diaphragm is arranged on the image side surface of the first glass lens; and an aperture stop is arranged on the image side surface of the fourth glass lens;
the F number of the projection optical system is smaller than 0.67.
In an alternative embodiment of the present utility model, the first glass lens, the second glass lens, the fourth glass lens and the fifth glass lens are all made of high-refraction low-dispersion materials, and the refractive index of the first glass lens, the second glass lens, the fourth glass lens and the fifth glass lens is 1.7-1.85; and
The third glass lens is made of a high-refraction high-dispersion material, and the refractive index of the third glass lens is 1.7-1.95.
In an alternative embodiment of the present utility model, the first glass lens, the second glass lens, the fourth glass lens and the fifth glass lens have a dispersion of 40 to 60; and
The dispersion of the third glass lens is less than 17.5-30.
In an alternative embodiment of the present utility model, the first glass lens and the second glass lens are each in a meniscus shape; and
The curvature of the object side of the first glass lens and the second glass lens is larger than the curvature of the image side.
In an alternative embodiment of the utility model, the marginal field vignetting proportion of the vignetting diaphragm is 20% -30%.
In an alternative embodiment of the utility model, the ratio of the length to the focal length of the projection optical system is 1.8-2.2.
In an alternative embodiment of the present utility model, the angle of view of the projection optical system is ±12.5° to ±17°.
In an alternative embodiment of the present utility model, the ratio of the diameter to the center thickness of the fifth glass lens is 2 to 2.5.
In an alternative embodiment of the present utility model, the second glass lens and the third glass lens are mounted and fixed in an abutting manner.
The car lamp is realized by the following steps:
A vehicle lamp, comprising: the projection optical system.
By adopting the technical scheme, the utility model has the following beneficial effects: the projection optical system and the car lamp using the same are all-glass lenses for the first glass lens, the second glass lens, the third glass lens, the fourth glass lens and the fifth glass lens, have good imaging quality and excellent high-temperature stability, basically have no loss of projection performance, have mature glass element coating technology and can effectively improve the overall light efficiency. And secondly, the F number of the optical system is smaller than 0.67, the utilization rate of the optical system to a light source of the Micro-LED is high, and the light efficiency of the system is high. Furthermore, the ratio of the length to the focal length of the integral projection optical system is 1.8-2.2, and the design ensures that the integral projection optical system has compact structure and smaller volume. Therefore, the compactness and high light efficiency of the whole structure of the projection optical system are both considered for the present embodiment.
Drawings
FIG. 1 is a schematic diagram of a projection optical system of the present utility model;
FIG. 2 is a graph of curvature of field and distortion corresponding to the plane type parameters of the projection optical system according to the present utility model in the first embodiment;
FIG. 3 is a graph of MTF versus profile parameters for a projection optical system of the present utility model in a first embodiment;
FIG. 4 is an axial chromatic aberration diagram corresponding to the plane parameters of the projection optical system of the present utility model in the first embodiment;
FIG. 5 is a graph of curvature of field and distortion for a plane type parameter for a projection optical system according to the present utility model in a second embodiment;
FIG. 6 is a graph of MTF versus profile parameters for a projection optical system of the present utility model in a second embodiment;
Fig. 7 is an axial chromatic aberration diagram corresponding to the plane parameters of the projection optical system of the present utility model in the second embodiment.
In the figure: a first glass lens 1, a vignetting diaphragm 2, a second glass lens 3, a third glass lens 4, an aperture diaphragm 5, a fourth glass lens 6, a fifth glass lens 7 and an object plane LED light source 8.
Detailed Description
In order that the utility model may be more readily understood, a more particular description of the utility model will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
Example 1:
Referring to fig. 1 to 7, the present embodiment provides a projection optical system, which generally includes: a first glass lens 1 with positive optical power, a second glass lens 3 with positive optical power, a third glass lens 4 with negative optical power, a fourth glass lens 6 with positive optical power, a fifth glass lens 7 and an object plane LED light source 8 are sequentially arranged from an image side to an object side along the optical axis direction.
In an alternative embodiment, the second glass lens 3 is mounted in an abutting manner with the third glass lens 4. Specifically, the positioning between the second glass lens 3 and the third glass lens 4 usually adopts a space ring to limit the edge, and adopts a contact mode to directly utilize the lens surface for contact positioning, so that the whole length can be reduced, and the number of structural members can be reduced. In addition, the second glass lens 3 has positive focal power, the third glass lens 4 has negative focal power, and the air interval between the positive lens and the negative lens can be reduced in a leaning manner, so that the abrupt change of the heights of the light rays with different fields of view between the two surfaces is avoided, and the imaging quality is improved.
More specifically, the image side surface and the object side surface of the first glass lens 1 are the S1 surface and the S2 surface, respectively, based on the above-described structure; the image side surface and the object side surface of the second glass lens 3 are respectively an S3 surface and an S4 surface; the image side surface and the object side surface of the third glass lens 4 are respectively an S5 surface and an S6 surface; the image side surface and the object side surface of the fourth glass lens 6 are respectively an S7 surface and an S8 surface; the image side surface and the object side surface of the fifth glass lens 7 are an S9 surface and an S10 surface, respectively. Along the direction from the image side to the object side, the S1 surface, the S3 surface, the S7 surface, the S8 surface and the S9 surface are all convex surfaces, and the S2 surface, the S4 surface, the S5 surface, the S6 surface and the S10 surface are all concave surfaces. The third glass lens 4 is biconcave, corrects main chromatic aberration, and the fourth glass lens 6 is biconvex, and provides main focal power. The ratio of the diameter to the center thickness of the fifth glass lens 7 is 2 to 2.5, and chromatic aberration can be further corrected while curvature of field and distortion are corrected.
Based on the above, the vignetting diaphragm 2 is disposed on the image side surface S1 of the first glass lens 1, and the vignetting ratio of the edge field of view of the vignetting diaphragm 2 is 20% -30%, so that the overall performance can be effectively improved. The fourth glass lens 6 has an aperture stop 5 provided on an image side surface S7 thereof, and has a gaussian-like structure.
Further, the first glass lens 1, the second glass lens 3, the fourth glass lens 6 and the fifth glass lens 7 are made of a high-refractive-index low-dispersion material, and have a refractive index Nd of 1.7 to 1.85. The dispersion Vd of the first glass lens 1, the second glass lens 3, the fourth glass lens 6, and the fifth glass lens 7 is 40 to 60. The first glass lens 1, the second glass lens 3, the fourth glass lens 6 and the fifth glass lens 7 are made of materials within this range, and spherical aberration can be corrected well without generating excessive chromatic aberration.
In addition, the third glass lens 4 is made of a high-refraction high-dispersion material, and the refractive index Nd of the third glass lens is 1.7-1.95; and the dispersion Vd of the third glass lens 4 is less than 17.5-30, and the third glass lens 4 made of the material in this range can be used for correcting chromatic aberration.
Based on the above structure, the F number of the projection optical system is smaller than 0.67, so that the light beam exceeding ±48° from the LED light source can be collected, and the overall light efficiency is high.
It is also necessary to say that the first glass lens 1 and the second glass lens 3 each have a meniscus shape; and the curvature of the object side surface of the first glass lens 1 and the second glass lens 3 is larger than that of the image side surface, and the object side surface bears partial optical power and is used for reducing the height of light rays and reducing spherical aberration.
In addition, the ratio of the length to the focal length of the projection optical system is 1.8-2.2, and the design ensures that the whole projection optical system has compact structure and smaller volume. The angle of view of the projection optical system is + -12.5 DEG to + -17 deg.
Based on the above-described structure, the plane parameters of the projection optical system under the first embodiment are as follows:
based on this embodiment, as shown in fig. 2, which is a field curvature distortion diagram of the system, the overall distortion is less than 2%; as shown in fig. 3, which is a MTF plot for the system, all field of view MTFs are greater than 0.3 at 6.25 lp/mm; as shown in FIG. 4, the axial chromatic aberration of the system is smaller than 30um in R/G, B/G chromatic aberration.
The plane parameters of the projection optical system under the second embodiment are as follows:
Based on this embodiment, as shown in fig. 5, which is a field curvature distortion diagram of the system, the overall distortion is less than 2%; as shown in fig. 6, which is a MTF plot for the system, all field of view MTFs are greater than 0.3 at 6.25 lp/mm; as shown in FIG. 7, the axial chromatic aberration of the system is smaller than 30um in R/G, B/G chromatic aberration.
In summary, for the projection optical system of the present embodiment, first, for the first glass lens 1, the second glass lens 3, the third glass lens 4, the fourth glass lens 6 and the fifth glass lens 7 are all full glass lenses, so that the imaging quality is good, the high-temperature stability is good, the projection performance is basically not lost, and the coating technology of the glass element is mature, so that the overall light efficiency can be effectively improved. And secondly, the F number of the optical system is smaller than 0.67, the utilization rate of the optical system to a light source of the Micro-LED is high, and the light efficiency of the system is high. Furthermore, the ratio of the length to the focal length of the integral projection optical system is 1.8-2.2, and the design ensures that the integral projection optical system has compact structure and smaller volume. Therefore, the compactness and high light efficiency of the whole structure of the projection optical system are both considered for the present embodiment.
Example 2:
On the basis of the projection optical system of embodiment 1, this embodiment provides a vehicle lamp including: the projection optical system of embodiment 1.
The foregoing embodiments have been provided for the purpose of illustrating the general principles of the present utility model, and are more fully described herein with reference to the accompanying drawings, in which the principles of the present utility model are shown and described, and in which the general principles of the utility model are defined by the appended claims.
In the description of the present utility model, it should be understood that the terms "orientation" or "positional relationship" are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and to simplify the description, rather than to indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the utility model.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present utility model, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are directions or positional relationships based on those shown in the drawings, or are directions or positional relationships conventionally put in use of the inventive product, are merely for convenience of describing the present utility model and simplifying the description, and are not indicative or implying that the apparatus or element to be referred to must have a specific direction, be constructed and operated in a specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely to distinguish between descriptions and should not be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal," "vertical," "overhang," and the like do not denote a requirement that the component be absolutely horizontal or overhang, but rather may be slightly inclined. As "horizontal" merely means that its direction is more horizontal than "vertical", and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the present utility model, unless expressly stated or limited otherwise, a first feature may include first and second features directly contacting each other, either above or below a second feature, or through additional features contacting each other, rather than directly contacting each other. Moreover, the first feature being above, over, and on the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being below, beneath, and beneath the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is less level than the second feature.
Claims (10)
1. A projection optical system, comprising: a first glass lens with positive focal power, a second glass lens with positive focal power, a third glass lens with negative focal power, a fourth glass lens with positive focal power, a fifth glass lens and an object plane LED light source are sequentially arranged from the image side to the object side along the optical axis direction; wherein the method comprises the steps of
The image side surface of the first glass lens, the image side surface of the second glass lens, the image side surface and the object side surface of the fourth glass lens and the image side surface of the fifth glass lens are convex surfaces along the direction from the image side to the object side; the object side surface of the first glass lens, the object side surface of the second glass lens, the image side surface and the object side surface of the third glass lens and the object side surface of the fifth glass lens are all concave surfaces; and
An vignetting diaphragm is arranged on the image side surface of the first glass lens; and an aperture stop is arranged on the image side surface of the fourth glass lens;
the F number of the projection optical system is smaller than 0.67.
2. The projection optical system according to claim 1, wherein the first glass lens, the second glass lens, the fourth glass lens and the fifth glass lens are made of a material with high refraction and low dispersion, and have a refractive index of 1.7 to 1.85; and
The third glass lens is made of a high-refraction high-dispersion material, and the refractive index of the third glass lens is 1.7-1.95.
3. The projection optical system according to claim 2, wherein the first, second, fourth, and fifth glass lenses have a dispersion of 40 to 60; and
The dispersion of the third glass lens is less than 17.5-30.
4. The projection optical system of claim 1, wherein the first glass lens and the second glass lens are each in a meniscus shape; and
The curvature of the object side of the first glass lens and the second glass lens is larger than the curvature of the image side.
5. The projection optical system of claim 1 wherein the fringe field vignetting ratio of the vignetting stop is 20% to 30%.
6. The projection optical system according to claim 1, wherein a ratio of a length to a focal length of the projection optical system is 1.8 to 2.2.
7. The projection optical system according to claim 1, wherein the angle of view of the projection optical system is ±12.5° to ±17°.
8. The projection optical system of claim 1, wherein the ratio of the diameter to the center thickness of the fifth glass lens is 2 to 2.5.
9. The projection optical system of claim 1, wherein the second glass lens and the third glass lens are mounted and fixed in an abutting manner.
10. A vehicle lamp, comprising: the projection optical system according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323216918.3U CN221039595U (en) | 2023-11-28 | 2023-11-28 | Projection optical system and car lamp using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323216918.3U CN221039595U (en) | 2023-11-28 | 2023-11-28 | Projection optical system and car lamp using same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221039595U true CN221039595U (en) | 2024-05-28 |
Family
ID=91131960
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323216918.3U Active CN221039595U (en) | 2023-11-28 | 2023-11-28 | Projection optical system and car lamp using same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221039595U (en) |
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2023
- 2023-11-28 CN CN202323216918.3U patent/CN221039595U/en active Active
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