CN115933128A - Non-telecentric projection lens and digital projection car lamp - Google Patents
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Abstract
A non-telecentric projection lens and a digital projection vehicle lamp relate to the technical field of projection lenses. The non-telecentric projection lens comprises a pixelized controllable digital chip, protective glass, a first optical objective lens, a second optical objective lens, a third optical objective lens and a fourth optical objective lens which are sequentially arranged along a projection light path; the first optical objective lens, the second optical objective lens and the third optical objective lens are all spherical lenses, the fourth optical objective lens is an aspherical lens, and the parameters of the first optical objective lens, the second optical objective lens, the third optical objective lens and the fourth optical objective lens meet the following relational expression: | f4| > | f1| > | f2| > | f3|; wherein f1 is the focal length of the first optical objective lens, f2 is the focal length of the second optical objective lens, f3 is the focal length of the third optical objective lens, and f4 is the focal length of the fourth optical objective lens. The non-telecentric projection lens has the advantages of small lens quantity, compact structure, convenient assembly and suitability for batch production.
Description
Technical Field
The invention relates to the technical field of projection lenses, in particular to a non-telecentric projection lens and a digital projection car lamp.
Background
In recent years, with the development and depth of semiconductor technology, digital projection display technology has been advanced, and projection apparatuses have been widely used in various fields such as industry, business, automobiles, education, and homes. Among them, digital Light Processing (DLP) projection apparatuses have become one of mainstream projection apparatuses by virtue of their high definition pictures, high brightness images, rich colors and high contrast displays.
Compared with the common headlamp, the digital projection headlamp has high definition quality and high pixel resolution without glare, digital projection can create more ideal lighting conditions at night, visual support of a driving auxiliary system is expanded, and the risk that drivers of oncoming vehicles are dazzled is reduced with maximum intensity, so that users can flexibly deal with various road conditions. Meanwhile, the digital projection vehicle lamp can also project road signs such as zebra stripes, stop signs, guide lines and the like on the road surface, so that the safety of the vehicle running at night is effectively improved. However, the projection lens of the existing digital projection vehicle lamp generally has the problems of large number of lenses, complex structure and high cost.
Disclosure of Invention
The invention aims to provide a non-telecentric projection lens and a digital projection vehicle lamp, which have the advantages of small lens number, compact structure, convenient assembly and suitability for batch production.
The embodiment of the invention is realized by the following steps:
in one aspect of the invention, a non-telecentric projection lens is provided, which comprises a pixelized controllable digital chip, a protective glass, a first optical objective, a second optical objective, a third optical objective and a fourth optical objective, which are sequentially arranged along a projection light path; the first optical objective lens, the second optical objective lens and the third optical objective lens are all spherical lenses, the fourth optical objective lens is an aspherical lens, and the parameters of the first optical objective lens, the second optical objective lens, the third optical objective lens and the fourth optical objective lens meet the following relational expression: | f4| > | f1| > | f2| > | f3|; wherein f1 is the focal length of the first optical objective lens, f2 is the focal length of the second optical objective lens, f3 is the focal length of the third optical objective lens, and f4 is the focal length of the fourth optical objective lens. The non-telecentric projection lens has the advantages of small lens quantity, compact structure, convenient assembly and suitability for batch production.
Optionally, the non-telecentric projection lens further comprises a diaphragm disposed between the third optical objective and the fourth optical objective.
Optionally, the distance between the pixelated controllable digital chip and the protective glass is 0.307mm, the distance between the protective glass and the center of the first optical objective is 36.3mm, the distance between the center of the first optical objective and the center of the second optical objective is 1mm, the distance between the center of the second optical objective and the center of the third optical objective is 1.2mm, and the distance between the center of the third optical objective and the center of the fourth optical objective is 13mm.
Optionally, the cover glass is a flat glass, and the cover glass has a center thickness of 0.7mm, a refractive index of 1.51, and a material abbe number of 62.9.
Optionally, the first optical objective lens is a biconvex spherical lens, the center thickness of the first optical objective lens is 6.13mm, the edge thickness of the first optical objective lens is 1.05mm, and the lens aperture of the first optical objective lens is 38.8mm; the refractive index of the first optical objective lens is 1.61, and the Abbe number of the material is 58.6; the focal length of the first optical objective lens is larger than 40mm and smaller than 100mm, and the face angle of the first optical objective lens is smaller than 25 degrees.
Optionally, the second optical objective lens is a biconvex spherical lens, the center thickness of the second optical objective lens is 9.71mm, the edge thickness of the second optical objective lens is 2mm, and the aperture of the second optical objective lens is 38.9mm; the refractive index of the second optical objective lens is 1.61, and the Abbe number of the material is 60.6; the focal length of the second optical objective lens is larger than 10mm and smaller than 60mm.
Optionally, the third optical objective is a biconcave spherical lens, the center thickness of the third optical objective is 5.70mm, the edge thickness of the third optical objective is 11.40mm, and the lens aperture of the third optical objective is 37.6mm; the refractive index of the third optical objective lens is 1.73, and the Abbe number of the material is 28.3; the focal length of the third optical objective lens is larger than 10mm and smaller than 60mm.
Optionally, the fourth optical objective lens is a meniscus lens, the center thickness of the fourth optical objective lens is 4.90mm, the edge thickness of the fourth optical objective lens is 3.07mm, and the lens caliber of the fourth optical objective lens is 39mm; the refractive index of the fourth optical objective lens is 1.58, and the Abbe number of the material is 30.1; the focal length of the fourth optical objective lens is larger than 100mm and smaller than 150mm.
Optionally, the surface type of the fourth optical objective satisfies the following formula:
wherein z is rise, c is curvature at the vertex of the curved surface, r = x 2 +y 2 K is a conic coefficient, x, y are orthogonal components of a coordinate plane perpendicular to the optical axis, α 4 、α 6 、α 8 、α 10 、α 12 、α1 4 、α 16 Are high order aspheric coefficients.
In another aspect of the invention, a digital projection vehicle lamp is provided, which comprises the above-mentioned non-telecentric projection lens.
The beneficial effects of the invention include:
the non-telecentric projection lens comprises a pixelized controllable digital chip, protective glass, a first optical objective, a second optical objective, a third optical objective and a fourth optical objective which are sequentially arranged along a projection light path; the first optical objective lens, the second optical objective lens and the third optical objective lens are all spherical lenses, the fourth optical objective lens is an aspherical lens, and the parameters of the first optical objective lens, the second optical objective lens, the third optical objective lens and the fourth optical objective lens meet the following relational expression: i f4| > | f1| > | f2| > | f3|; wherein f1 is the focal length of the first optical objective lens, f2 is the focal length of the second optical objective lens, f3 is the focal length of the third optical objective lens, and f4 is the focal length of the fourth optical objective lens. The non-telecentric projection lens is a projection lens with the f-number between 1.1 and 1.2, the distortion less than 1 percent, the focal length 42mm, the back focus between 37.5mm and 39.5mm and TTL/BFL =2.08, has compact integral structure, small lens number, convenient assembly and lower cost, and is suitable for industrial mass production; in addition, the back burnt of this application has guaranteed the working range of illumination light path between 37.5mm to 39.5mm, can effectively improve the utilization ratio of illumination light, and this application adopts non-telecentric system, consequently can avoid using the TIR prism, can effectively reduce the camera lens volume.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a non-telecentric projection lens provided in an embodiment of the present invention;
FIG. 2 is a field curvature diagram of a non-telecentric projection lens according to an embodiment of the invention;
fig. 3 is a distortion diagram of a non-telecentric projection lens according to an embodiment of the invention;
FIG. 4 is a graph of a geometric transfer function of a non-telecentric projection lens according to an embodiment of the invention at 10 lp/mm;
fig. 5 is a point diagram of a non-telecentric projection lens according to an embodiment of the invention.
Icon: 10-pixelized controllable digital chips; 20-protective glass; 30-a first optical objective; 31-a first surface; 32-a second surface; 40-a second optical objective; 41-a third surface; 42-a fourth surface; 50-a third optical objective; 51-a fifth surface; 52-a sixth surface; 60-a fourth optical objective; 61-a seventh surface; 62-an eighth surface; 70-diaphragm.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that the present product is conventionally placed in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1, the present embodiment provides a non-telecentric projection lens, which includes a pixilated controllable digital chip 10, a protective glass 20, a first optical objective 30, a second optical objective 40, a third optical objective 50, and a fourth optical objective 60, which are sequentially disposed along a projection optical path; the first optical objective lens 30, the second optical objective lens 40 and the third optical objective lens 50 are all spherical lenses, the fourth optical objective lens 60 is an aspherical lens, and the parameters of the first optical objective lens 30, the second optical objective lens 40, the third optical objective lens 50 and the fourth optical objective lens 60 satisfy the following relations: i f4| > | f1| > | f2| > | f3|; where f1 is the focal length of the first optical objective lens 30, f2 is the focal length of the second optical objective lens 40, f3 is the focal length of the third optical objective lens 50, and f4 is the focal length of the fourth optical objective lens 60. The non-telecentric projection lens has the advantages of small lens quantity, compact structure, convenient assembly and suitability for batch production.
In the present embodiment, the pixilated digital controller chip 10, the cover glass 20, the first optical objective 30, the second optical objective 40, the third optical objective 50, and the fourth optical objective 60 are disposed in parallel in this order.
Wherein, optionally, the distance between the pixelated controllable digital chip 10 and the protective glass 20 is 0.307mm, the distance between the protective glass 20 and the center of the first optical objective 30 is 36.3mm, the distance between the center of the first optical objective 30 and the center of the second optical objective 40 is 1mm, the distance between the center of the second optical objective 40 and the center of the third optical objective 50 is 1.2mm, and the distance between the center of the third optical objective 50 and the center of the fourth optical objective 60 is 13mm.
In this example, the cover glass 20 is a flat glass, and the cover glass 20 has a center thickness of 0.7mm, a refractive index of 1.51, and an abbe number of 62.9.
Specifically, the specific material of the cover glass 20 is selected by those skilled in the art according to actual needs, and the application is not limited thereto. For example, in order to further reduce the cost, the material of the cover glass 20 may be selected from a relatively inexpensive material, as long as the material of the cover glass 20 is selected such that the center thickness thereof is 0.7mm, the refractive index thereof is 1.51, and the Abbe number thereof is 62.9.
Referring to fig. 1, the first optical objective lens 30 is a biconvex spherical lens, the center thickness of the first optical objective lens 30 is 6.13mm, the edge thickness of the first optical objective lens 30 is 1.05mm, and the aperture of the first optical objective lens 30 is 38.8mm; the refractive index of the first optical objective lens 30 is 1.61, and the abbe number of the material is 58.6; the focal length of the first optical objective lens 30 is greater than 40mm and less than 100mm, and the face angle of the first optical objective lens 30 is less than 25 °.
The first optical objective 30 includes a first surface 31 and a second surface 32 opposite to each other, the first surface 31 is close to the cover glass 20, and the second surface 32 is close to the second optical objective 40. The first surface 31 and the second surface 32 are both convex spherical surfaces, and the first surface 31 and the second surface 32 are integrally and symmetrically arranged relative to the center of the horizontal optical axis.
In this embodiment, the first surface 31 has a face radius of 78.59mm and the second surface 32 has a face radius of-71.75 mm.
The choice of the specific material of the first optical objective 30 is not limited in this application, and in order to further control the cost, a less expensive material can be chosen, as long as the material can be chosen such that the refractive index is 1.61, the abbe number of the material is 58.6, the focal length is greater than 40mm and less than 100mm, and the face angle is less than 25 °.
In addition, the focal length of the first optical objective lens 30 may be, for example, 50mm, 60mm, 70mm, 80mm, 90mm, or the like.
In the present embodiment, the second optical objective lens 40 is a biconvex spherical lens, the center thickness of the second optical objective lens 40 is 9.71mm, the edge thickness of the second optical objective lens 40 is 2mm, and the lens aperture of the second optical objective lens 40 is 38.9mm; the refractive index of the second optical objective lens 40 is 1.61, and the abbe number of the material is 60.6; the focal length of the second optical objective 40 is greater than 10mm and less than 60mm.
Wherein the second optical objective 40 comprises a third surface 41 and a fourth surface 42 which are oppositely arranged, the third surface 41 is close to the pixelated controllable digital chip 10, and the fourth surface 42 is far away from the pixelated controllable digital chip 10. In the present embodiment, the third surface 41 and the fourth surface 42 are both convex spherical surfaces and are symmetrically disposed with respect to the horizontal optical axis.
The face radius 36.27mm near the third surface 41 of the pixelated controllable digital chip 10 and the face radius of the fourth surface 42 away from the pixelated controllable digital chip 10 is-90.86 mm.
Similarly, to reduce the cost, the material of the second optical objective 40 may be selected to be less expensive. The choice of the specific material can be selected by the person skilled in the art as long as the parameter requirements for the second optical objective 40 as described above are met.
In addition, the focal length of the second optical objective lens 40 may be 20mm, 30mm, 40mm, 50mm, or the like, for example.
Optionally, the third optical objective 50 is a biconcave spherical lens, and the center thickness of the third optical objective 50 is 5.70mm, the edge thickness of the third optical objective 50 is 11.40mm, and the lens aperture of the third optical objective 50 is 37.6mm; the refractive index of the third optical objective lens 50 is 1.73, and the abbe number of the material is 28.3; the focal length of the third optical objective lens 50 is greater than 10mm and less than 60mm.
The third optical objective 50 includes a fifth surface 51 and a sixth surface 52, which are disposed oppositely, the fifth surface 51 is close to the pixelated controllable digital chip 10, and the sixth surface 52 is far from the pixelated controllable digital chip 10. The fifth surface 51 and the sixth surface 52 are both concave spherical surfaces and are symmetrically arranged with respect to the horizontal optical axis.
The surface radius of the fifth surface 51 close to the pixelated controllable digital chip 10 is-82.26 mm and the surface radius of the sixth surface 52 far from the pixelated controllable digital chip 10 is 46.33mm.
To further reduce the cost, the material of the third optical objective 50 can be chosen to be a cheaper material. The choice of the specific materials can be selected by the person skilled in the art as long as the parameter requirements for the third optical objective 50 as described above are met.
In addition, the focal length of the third optical objective lens 50 may be 20mm, 30mm, 40mm, 50mm, or the like, for example.
To further control the field angle magnitude, the non-telecentric projection lens optionally further comprises a stop 70 disposed between the third optical objective 50 and the fourth optical objective 60.
The specific parameters and the type of the diaphragm 70 are not limited in this application, and those skilled in the art can select the parameters and the type according to the imaging requirements.
In the present embodiment, the fourth optical objective lens 60 is a meniscus lens, the center thickness of the fourth optical objective lens 60 is 4.90mm, the edge thickness of the fourth optical objective lens 60 is 3.07mm, and the lens aperture of the fourth optical objective lens 60 is 39mm; the refractive index of the fourth optical objective lens 60 is 1.58, and the abbe number of the material is 30.1; the focal length of the fourth optical objective 60 is greater than 100mm and less than 150mm.
That is, the fourth optical objective 60 is an aspherical mirror, and the fourth optical objective 60 includes a seventh surface 61 and an eighth surface 62 which are opposite, wherein the seventh surface 61 is close to the pixelated controllable digital chip 10, and the eighth surface 62 is far away from the pixelated controllable digital chip 10. The seventh surface 61 is a concave aspherical surface and the eighth surface 62 is a convex aspherical surface.
The surface radius of the seventh surface 61 close to the pixelated controllable digital chip 10 is-300 mm and the surface radius of the eighth surface 62 far from the pixelated controllable digital chip 10 is-57.52 mm.
To further reduce the cost, the material of the fourth optical objective 60 can be chosen to be less expensive. The choice of the specific materials can be selected by the person skilled in the art as long as the parameter requirements for the fourth optical objective 60 described above are met.
In addition, the focal length of the fourth optical objective lens 60 may be 110mm, 120mm, 130mm, 140mm, or the like, for example.
In the present embodiment, the surface type of the fourth optical objective lens 60 satisfies the following formula:
wherein z is rise, c is curvature at the vertex of the curved surface, r = x 2 +y 2 K is a conic coefficient, x, y are orthogonal components of a coordinate plane perpendicular to the optical axis, α 4 、α 6 、α 8 、α 10 、α 12 、α1 4 、α 16 Are high order aspheric coefficients.
The above-mentioned high-order aspheric coefficient α 4 、α 6 、α 8 、α 10 、α 12 、α1 4 、α 16 The specific values are given in the following table:
referring to fig. 2, fig. 2 is a field curvature diagram of a non-telecentric projection lens according to the present disclosure, wherein an x-axis is a field curvature deviation and a y-axis is an off-axis height. It can be seen that the field curvature of the non-telecentric projection lens provided by the application meets the standard range generally specified, and is controlled within the range of 0.35mm to-0.45 mm.
Referring to fig. 3, fig. 3 is a distortion diagram of a non-telecentric projection lens according to the present disclosure, wherein the x-axis is a distortion rate and the y-axis is an off-axis height. It can be seen that the distortion ratio of the non-telecentric projection lens provided by the application is controlled within the range of 0% to-0.9%, and the imaging quality is good.
Referring to fig. 4, fig. 4 is a graph of a geometric transfer function of the non-telecentric projection lens provided by the present application at 10lp/mm, and as can be seen from fig. 3, the optical transfer function of most fields at 10lp/mm is greater than 55%, and the index is high; and the curve is smooth and compact, which shows that the lens imaging is clear and uniform, and the system has good imaging quality.
Referring to fig. 5, fig. 5 is a point diagram of the non-telecentric projection lens provided in the present application, and as can be seen from fig. 5, the non-telecentric projection lens of the present application has good versatility, clear imaging, and high reliability.
In this embodiment, the non-telecentric projection lens provided by the application has an f-number of 1.1 to 1.2, a distortion of less than 1%, a focal length of 42mm, a back focus of 37.5mm to 39.5mm, and TTL/BFL = 2.08.
Wherein, the TTL is a total lens length, and the BFL is an optical back focus (i.e., a distance from a last surface of a lens in an optical system to an image plane).
In addition, the whole optical volume of the non-telecentric projection lens provided by the embodiment is 78mm × 40mm × 40mm.
This application adopts non-telecentric optical path, matches with automobile lighting system's F number (F-number) during its design, and the back burnt has guaranteed the operating interval of illumination optical path between 37.5mm to 39.5mm, can effectively improve the utilization ratio of illumination light. And this application adopts non-telecentric system, consequently can avoid using TIR prism, consequently can also effectively reduce the camera lens volume.
In summary, the non-telecentric projection lens provided by the present application includes a pixelized controllable digital chip 10, a protective glass 20, a first optical objective 30, a second optical objective 40, a third optical objective 50, and a fourth optical objective 60, which are sequentially disposed along a projection optical path; the first optical objective lens 30, the second optical objective lens 40 and the third optical objective lens 50 are all spherical lenses, the fourth optical objective lens 60 is an aspherical lens, and the parameters of the first optical objective lens 30, the second optical objective lens 40, the third optical objective lens 50 and the fourth optical objective lens 60 satisfy the following relations: i f4| > | f1| > | f2| > | f3|; where f1 is the focal length of the first optical objective lens 30, f2 is the focal length of the second optical objective lens 40, f3 is the focal length of the third optical objective lens 50, and f4 is the focal length of the fourth optical objective lens 60. The non-telecentric projection lens is a projection lens with the f-number of 1.1-1.2, the distortion of less than 1%, the focal length of 42mm, the back focus of 37.5 mm-39.5 mm and TTL/BFL =2.08, and has the advantages of compact integral structure, small number of lenses, convenient assembly and low cost, and is suitable for industrial mass production; in addition, the back burnt of this application has guaranteed the working range of illumination light path between 37.5mm to 39.5mm, can effectively improve the utilization ratio of illumination light, and this application adopts non-telecentric system, consequently can avoid using the TIR prism, can effectively reduce the camera lens volume.
In another aspect of the invention, a digital projection vehicle lamp is provided, which comprises the above-mentioned non-telecentric projection lens. Since the specific structure and the beneficial effects of the non-telecentric projection lens are described in detail in the foregoing, the details are not repeated herein.
The above description is only an alternative embodiment of the present invention, and is not intended to limit the present invention, and various modifications and variations of the present invention may be made by those skilled in the art. 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.
It should be noted that, in the above embodiments, the various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present invention does not separately describe various possible combinations.
Claims (10)
1. A non-telecentric projection lens is characterized by comprising a pixilated controllable digital chip, protective glass, a first optical objective, a second optical objective, a third optical objective and a fourth optical objective which are sequentially arranged along a projection light path; the first optical objective lens, the second optical objective lens and the third optical objective lens are all spherical lenses, the fourth optical objective lens is an aspheric lens, and parameters of the first optical objective lens, the second optical objective lens, the third optical objective lens and the fourth optical objective lens satisfy the following relational expressions: i f4| > | f1| > | f2| > | f3|; wherein f1 is a focal length of the first optical objective lens, f2 is a focal length of the second optical objective lens, f3 is a focal length of the third optical objective lens, and f4 is a focal length of the fourth optical objective lens.
2. A non-telecentric projection lens according to claim 1, wherein the non-telecentric projection lens further comprises a diaphragm disposed between the third optical objective and the fourth optical objective.
3. The non-telecentric projection lens according to claim 1, wherein the distance between the pixilated controllable digital chip and the cover glass is 0.307mm, the distance between the cover glass and the center of the first optical objective is 36.3mm, the distance between the center of the first optical objective and the center of the second optical objective is 1mm, the distance between the center of the second optical objective and the center of the third optical objective is 1.2mm, and the distance between the center of the third optical objective and the center of the fourth optical objective is 13mm.
4. A non-telecentric projection lens according to any one of claims 1-3, wherein the cover glass is a flat glass, and the cover glass has a central thickness of 0.7mm, a refractive index of 1.51, and an abbe number of 62.9.
5. A non-telecentric projection lens according to any one of the claims 1 to 3, wherein the first optical objective is a biconvex spherical lens, and the center thickness of the first optical objective is 6.13mm, the edge thickness of the first optical objective is 1.05mm, and the lens aperture of the first optical objective is 38.8mm; the refractive index of the first optical objective lens is 1.61, and the Abbe number of the material is 58.6; the focal length of the first optical objective lens is larger than 40mm and smaller than 100mm, and the face angle of the first optical objective lens is smaller than 25 degrees.
6. The non-telecentric projection lens according to any one of claims 1 to 3, wherein the second optical objective is a biconvex spherical lens, and the center thickness of the second optical objective is 9.71mm, the edge thickness of the second optical objective is 2mm, and the aperture of the second optical objective is 38.9mm; the refractive index of the second optical objective lens is 1.61, and the Abbe number of the material is 60.6; the focal length of the second optical objective lens is larger than 10mm and smaller than 60mm.
7. A non-telecentric projection lens according to any one of the claims 1 to 3, wherein the third optical objective is a biconcave spherical lens, and the center thickness of the third optical objective is 5.70mm, the edge thickness of the third optical objective is 11.40mm, and the lens aperture of the third optical objective is 37.6mm; the refractive index of the third optical objective is 1.73, and the Abbe number of the material is 28.3; the focal length of the third optical objective lens is larger than 10mm and smaller than 60mm.
8. A non-telecentric projection lens according to any one of the claims 1 to 3, wherein the fourth optical objective is a meniscus lens, and the center thickness of the fourth optical objective is 4.90mm, the edge thickness of the fourth optical objective is 3.07mm, and the lens aperture of the fourth optical objective is 39mm; the refractive index of the fourth optical objective is 1.58, and the Abbe number of the material is 30.1; the focal length of the fourth optical objective lens is larger than 100mm and smaller than 150mm.
9. The non-telecentric projection lens of claim 8, wherein the fourth optical objective has a profile that satisfies the following equation:
wherein z is rise, c is curvature at the vertex of the curved surface, r = x 2 +y 2 K is a conic coefficient, x, y are orthogonal components of a coordinate plane perpendicular to the optical axis, α 4 、α 6 、α 8 、α 10 、α 12 、α1 4 、α 16 Are high order aspheric coefficients.
10. A digital projection vehicle lamp comprising the non-telecentric projection lens according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310099576.7A CN115933128A (en) | 2023-02-10 | 2023-02-10 | Non-telecentric projection lens and digital projection car lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310099576.7A CN115933128A (en) | 2023-02-10 | 2023-02-10 | Non-telecentric projection lens and digital projection car lamp |
Publications (1)
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| CN115933128A true CN115933128A (en) | 2023-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310099576.7A Pending CN115933128A (en) | 2023-02-10 | 2023-02-10 | Non-telecentric projection lens and digital projection car lamp |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117991481A (en) * | 2024-04-03 | 2024-05-07 | 武汉高明兰光电科技有限公司 | High-zoom-ratio imaging objective lens |
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2023
- 2023-02-10 CN CN202310099576.7A patent/CN115933128A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117991481A (en) * | 2024-04-03 | 2024-05-07 | 武汉高明兰光电科技有限公司 | High-zoom-ratio imaging objective lens |
| CN117991481B (en) * | 2024-04-03 | 2024-06-04 | 武汉高明兰光电科技有限公司 | Objective lens for imaging |
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