CN117111390A

CN117111390A - Oblique-projection vehicle-mounted lens and vehicle

Info

Publication number: CN117111390A
Application number: CN202310706500.6A
Authority: CN
Inventors: 李忠能; 徐晓立; 荣四海
Original assignee: Magneti Marelli Automotive Components Wuhu Co Ltd
Current assignee: Magneti Marelli Automotive Components Wuhu Co Ltd
Priority date: 2023-06-13
Filing date: 2023-06-13
Publication date: 2023-11-24

Abstract

The application provides an oblique-projection vehicle-mounted lens and a vehicle, which comprise a light source, an illumination lens group, a pixel and an imaging lens group, wherein the light source, the illumination lens group, the pixel and the imaging lens group are sequentially arranged on an optical axis; the illumination lens group comprises at least one illumination lens which is rotationally asymmetric along the optical axis, and the imaging lens group comprises at least two imaging lenses; there is a different distribution of light energy at the far and near points on the image plane, and the light energy in the region between the far and near points on the image plane continuously tapers. By combining the differential design of the energy distribution of the object point corresponding to the far point on the image plane and the object point corresponding to the near point on the image plane through the illumination lens which is non-rotationally symmetrical along the optical axis, the object point energy corresponding to the far point on the image plane is higher, the object point energy corresponding to the near point on the image plane is lower, the far point far-reaching beam energy attenuation is serious, the energy attenuated by the far point is ensured to be consistent with the energy of the near point, the whole consistent energy distribution of the whole image plane can be achieved, and the brightness of the image plane is uniform.

Description

Oblique-projection vehicle-mounted lens and vehicle

Technical Field

The application relates to the technical field of vehicle-mounted projection, in particular to an oblique-projection vehicle-mounted lens and a vehicle.

Background

Along with the intelligent degree of car is higher and higher, in order to satisfy customer's different demands, on-vehicle projection lens also more and more carries on the car, realizes the projection effect of different functions, if: welcome light blanket, logo projection, signal indication, safety reminding and the like.

As the vehicle-mounted projection lens is selected and carried by more and more host factories, the application scene of the vehicle-mounted lens on the automobile is more and more abundant. Due to the limited use of scenes and installations, oblique projections are unavoidable. As shown in fig. 1 and fig. 2, in the prior art, a rotationally symmetrical spherical or aspherical mirror is generally selected as a vehicle-mounted projection lens, and due to oblique projection, the image distance is inconsistent, the short-distance image distance is short, the long-distance image distance is long, the light energy is attenuated more in a long distance, and the illumination of the far ground and the near ground is inconsistent.

The inclined projection lens in the prior art adopts a rotationally symmetrical spherical or aspherical mirror, so that the problem of uniformity of brightness of the whole projection view field cannot be solved, the problem of high close-range brightness and great attenuation of long-range brightness occurs, the overall brightness is inconsistent, and the problem exists to be improved.

Disclosure of Invention

Aiming at the defects in the prior art, the application aims to provide an oblique-projection vehicle-mounted lens and a vehicle.

The application provides an oblique-projection vehicle-mounted lens, which comprises a light source, an illumination lens group, a pixel and an imaging lens group, wherein the light source, the illumination lens group, the pixel and the imaging lens group are sequentially arranged on an optical axis; the illumination lens group comprises at least one illumination lens which is rotationally asymmetric along an optical axis, and the imaging lens group comprises at least two imaging lenses; there is a different distribution of light energy at the far and near points on the image plane, and the light energy in the region between the far and near points on the image plane continuously tapers.

Preferably, at least one illumination lens of the illumination lens group satisfies the following formula:

wherein, |f' _(x,y) | _min Is the minimum value of the absolute value of the focal length of the lens in the x direction and the y direction, |f' _(x,y) | _max Is the maximum value of the absolute value of the focal length of the lens in the x direction and the y direction.

Preferably, the energy of the object point corresponding to the far point on the image plane on the object plane is larger than the energy of the object point corresponding to the near point on the image plane, and the energy between the object point corresponding to the far point on the image plane and the object point corresponding to the near point on the image plane on the object plane continuously gradually changes.

Preferably, the illumination lens group comprises an illumination first lens, the illumination first lens comprises a first surface and a second surface, the first surface is close to the light source, the second surface faces away from the light source, and the second surface is an X-direction or Y-direction asymmetric free curved surface.

Preferably, the illumination lens group comprises an illumination second lens, the illumination second lens is arranged on one side of the illumination first lens, which faces away from the light source, the illumination second lens comprises a third surface and a fourth surface, and at least one of the third surface and the fourth surface is an X-direction or Y-direction asymmetric free-form surface.

Preferably, at least one of the surface types of the first surface, the second surface, the third surface and the fourth surface is an XY polynomial free-form surface, and the following formula is satisfied:

wherein,z is the sagittal height of the R position on the free-form surface, C is the surface curvature, c=1/R, R is the radius of curvature, k is the conic coefficient, P is the highest power series of the polynomial, and C (m, n) is the coefficient of the m-th and n-th expansion polynomials.

Preferably, the imaging lens further comprises a diaphragm, wherein the diaphragm is arranged between the pixel and the imaging lens group; or the diaphragm is arranged at one side of the imaging lens group, which is far away from the pixel along the optical axis direction; or the diaphragm is disposed inside the imaging lens group.

Preferably, a circuit board is further included, and the circuit board is electrically connected with the light source.

Preferably, the materials of the lenses in the illumination lens group and the imaging lens group include any one or more of glass and plastic.

According to the vehicle provided by the application, the oblique-projection vehicle-mounted lens is mounted on a vehicle body.

Compared with the prior art, the application has the following beneficial effects:

1. according to the application, by combining the non-rotationally symmetrical illumination lens along the optical axis and the differential design of the energy distribution of the object point corresponding to the far point on the object plane and the object point corresponding to the near point on the image plane, the energy of the object point corresponding to the far point on the image plane is higher, the energy of the object point corresponding to the near point on the image plane is lower, and as the far point is far, the light energy attenuation is serious, the energy attenuated by the far point is ensured to be consistent with the energy of the near point, the whole consistent energy distribution of the whole image plane can be realized, and the brightness of the image plane is uniform.

2. According to the application, one or two surfaces of one or more lenses of the illuminating lens adopt a non-rotationally symmetrical structure, light distribution is specially designed, and the illuminating lens is designed into an X-direction asymmetric and Y-direction symmetric form, so that the illuminance of an image plane can be very uniform through optimization, and the problem of inconsistent far and near brightness when the vehicle-mounted projection lens is obliquely projected is solved.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:

FIG. 1 is a vehicle lens of the prior art, which is mainly embodied in the background art;

FIG. 2 is a schematic diagram of illuminance simulation of a projection pattern of an oblique projection vehicle-mounted projection lens according to the background art;

FIG. 3 is a schematic view of the overall structure of an oblique lens for vehicle according to the present application;

FIG. 4 is a schematic view of an optical path structure of an oblique lens for vehicle according to the present application;

FIG. 5 is a schematic view of the optical path of a tilt-throw vehicle lens embodying the present application;

fig. 6 is a schematic diagram of illuminance simulation of a projection pattern of an oblique projection vehicle lens according to the present application.

The figure shows:

fourth surface 322 of circuit board 1

Light source 2 picture element 4

Illumination lens group 3 imaging lens group 5

First imaging lens 51 illuminating first lens 31

Illuminating second lens 32 second imaging lens 52

First surface 311 third imaging lens 53

Second surface 312 diaphragm 6

Third surface 321 image plane 7

Detailed Description

The present application will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the present application, but are not intended to limit the application in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all within the scope of the present application.

As shown in fig. 3, the Z direction of the present application is the optical axis direction, and the light propagation direction is positive from left to right; x+: vertically into the paper (screen); following the right hand rule. The X direction, the Y direction and the X direction are mutually perpendicular.

Example 1

As shown in fig. 3, 4 and 5, the oblique lens and the vehicle provided by the application comprise a light source 2, an illumination lens group 3, a pixel 4 and an imaging lens group 5, wherein the light source 2, the illumination lens group 3, the pixel 4 and the imaging lens group 5 are sequentially arranged on an optical axis. The illumination lens group 3 comprises at least one illumination lens which is rotationally asymmetric along the optical axis, i.e. the illumination lens has at least one face with an X-power which is not equal to the Y-power, and the imaging lens group 5 comprises at least two imaging lenses. There is a different distribution of light energy at the far and near points on the image plane 7 and the light energy in the region between the far and near points on the image plane 7 is continuously graded. The light emitted by the light source 2 illuminates the picture element 4 through the illumination lens group 3, and the picture element 4 is projected and imaged to the image plane 7 through the imaging lens group 5. It should be noted that: the plane in which the picture element 4 is located is the object plane of the entire projection system.

Specifically, at least one illumination lens of the illumination lens group 3 satisfies the following formula:

As shown in fig. 3, the point a 'is an image point corresponding to the point a on the object plane, and the point B' is an image point corresponding to the point B on the object plane. The present application satisfies the above formula by designing at least one lens in the illumination lens group 3 to have different light energy distributions at point a and at point B of the object plane, and also to have a continuously graded energy transition in the region between A, B. A. And the energy distribution at the position B is designed in a differentiation way, the energy of an object point corresponding to a far point of the image plane 7 is higher, and the energy of an object point corresponding to a near point of the image plane 7 is lower. As for the degree of difference of the two, the degree of difference is determined according to the actual concrete projection inclination degree, namely the degree of difference between a far point and a near point, actual design optimization is carried out, and the light distribution is accurate, so that the whole is uniform. When front projection is performed, it is only necessary to have the same distribution of light energy at point a and at point B of the object plane.

The concrete implementation is as follows: the light at the position A is more dispersed, the light beam at the position B is more concentrated, the energy is more concentrated, finally, the imaged point B 'has more concentrated light beams, and the point A' has sparse light distribution. Because the point B 'is far, the light energy attenuation is more serious than the point A', the energy after the attenuation of the point A 'is just consistent with the energy at the point B', the area between the points A 'and B' also has continuously graded light density distribution, and the integral consistent energy distribution of the whole image plane 7 and the uniform brightness of the image plane 7 can be realized through precise optimization and adjustment.

One possible implementation manner is that the illumination lens group 3 includes an illumination first lens 31, where the illumination first lens 31 includes a first surface 311 and a second surface 312, the first surface 311 is close to the light source 2, the second surface 312 faces away from the light source 2, the first surface 311 may be a symmetrical free-form surface or an asymmetrical free-form surface, and the second surface 312 is an X-direction or Y-direction asymmetrical free-form surface. The illumination lens group 3 further comprises an illumination second lens 32, the illumination second lens 32 being arranged on the side of the illumination first lens 31 facing away from the light source 2, the illumination second lens 32 comprising a third surface 321 and a fourth surface 322, at least one of the third surface 321 and the fourth surface 322 being an asymmetric free-form surface in X-direction or Y-direction. The purpose of the asymmetric surface type is to make the light emitted by the light source 2 have different convergence capacities in the X direction or the Y direction, and the light energy obtained by finally projecting the long-distance point is kept consistent with the light energy obtained by the short-distance point through precise light distribution, so that the brightness is uniform and consistent in the whole imaging view field range.

It should be noted that: at least one of the surface types of the first surface 311, the second surface 312, the third surface 321 and the fourth surface 322 is an XY polynomial free-form surface, and the following formula is satisfied:

wherein,z is the sagittal height of the R position on the free-form surface, c is the surface curvature, c=1/R, R is the radius of curvature, k is the conic coefficient, and P is the polynomialC (m, n) is the coefficient of the m, n-th expansion polynomial.

The energy of the object point on the object plane corresponding to the far point on the image plane 7 is larger than the energy of the object point corresponding to the near point on the image plane 7, and the energy between the object point on the object plane corresponding to the far point on the image plane 7 and the object point corresponding to the near point on the image plane 7 continuously gradually changes.

The picture elements 4 comprise a film or luminescent picture element 4 printed with a projection pattern. The luminescent pixel 4 includes, but is not limited to, a Mini LED, a micro LED, an LCD liquid crystal screen, a TFT screen, an Lcos, or a digital micromirror DMD that is illuminated. By the arrangement of the picture elements 4, the vehicle-mounted projection lamp can project a preset projection pattern to the ground.

The imaging lens group 5 comprises at least two imaging lenses to project a clear, low-chromatic aberration, low-distortion pattern of the picture elements 4 onto the image plane 7. One possible implementation is: the imaging lens group 5 includes a first imaging lens 51, a second imaging lens 52, and a third imaging lens 53. The first imaging lens 51, the second imaging lens 52, and the third imaging lens 53 each include any one or more of a spherical surface, an aspherical surface, and a free-form surface. The materials of the first imaging lens 51, the second imaging lens 52, and the third imaging lens 53 include any one or more of glass and plastic.

Also included is a diaphragm 6, the diaphragm 6 being arranged between the picture element 4 and the imaging lens group 5. Or diaphragm 6 is provided on the side of imaging lens group 5 away from picture element 4 in the optical axis direction. Or a diaphragm 6 is provided inside the imaging lens group 5. The diaphragm 6 limits the size of the light beam and controls the amount of light entering the system. The diaphragm 6 may be disposed at a specific position between the pixel 4 and the imaging lens group 5, or disposed at a specific position behind the imaging lens group 5, or at a specific position inside the imaging lens group 5, where the diaphragm 6 mainly plays a role in limiting the light beam, so as to adjust the intensity of the light beam, and help to enhance the imaging effect of the projection lamp. And can be adjusted according to actual use conditions.

Also comprises a circuit board 1, wherein the circuit board 1 is electrically connected with the light source 2. The light source 2 may be an LED lamp, and the circuit board 1 may be soldered on the circuit board 1 as an electrical mounting base for the light source 2.

The materials of the lenses in the illumination lens group 3 and the imaging lens group 5 include any one or more of glass and plastic.

The application further provides a vehicle, wherein the oblique-projection vehicle-mounted lens is arranged on the vehicle body.

As shown in fig. 2 and 6, it should be further explained that: by combining the differential design of the energy distribution of the object point corresponding to the far point on the image surface 7 and the object point corresponding to the near point on the image surface 7 on the object plane through the illumination lens which is non-rotationally symmetrical along the optical axis, the energy of the object point corresponding to the far point on the image surface 7 is higher, the energy of the object point corresponding to the near point on the image surface 7 is lower, and as the far point is far, the light energy attenuation is serious, the energy after the far point attenuation is ensured to be consistent with the energy of the near point, the integral consistency of the energy distribution of the whole image surface 7 can be realized, and the brightness of the image surface is uniform.

Preferred embodiment one

According to the first embodiment, according to the oblique lens assembly and the vehicle provided by the present application, the aspheric parameters of the first surface 311, the second surface 312, the third surface 321 and the fourth surface 322 in the illumination lens assembly 3 are respectively:

in the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

The foregoing describes specific embodiments of the present application. It is to be understood that the application is not limited to the particular embodiments described above, and that various changes or modifications may be made by those skilled in the art within the scope of the appended claims without affecting the spirit of the application. The embodiments of the application and the features of the embodiments may be combined with each other arbitrarily without conflict.

Claims

1. The oblique-projection vehicle-mounted lens is characterized by comprising a light source (2), an illumination lens group (3), a pixel (4) and an imaging lens group (5), wherein the light source (2), the illumination lens group (3), the pixel (4) and the imaging lens group (5) are sequentially arranged on an optical axis;

the illumination lens group (3) comprises at least one illumination lens which is not rotationally symmetrical along an optical axis, and the imaging lens group (5) comprises at least two imaging lenses;

there is a different distribution of light energy at the far and near points on the image plane (7), and the light energy in the region between the far and near points on the image plane (7) is continuously graded.

2. The oblique-projection vehicle lens according to claim 1, characterized in that at least one illumination lens of the illumination lens group (3) satisfies the following formula:

3. The oblique-projection vehicle-mounted lens according to claim 1, wherein the energy of an object point on the object plane corresponding to a far point on the image plane (7) is larger than the energy of an object point on the image plane (7) corresponding to a near point, and the energy between the object point on the object plane corresponding to the far point on the image plane (7) and the object point on the image plane (7) corresponding to the near point is continuously graded.

4. The oblique-projection vehicle lens according to claim 2, characterized in that the illumination lens group (3) comprises an illumination first lens (31), the illumination first lens (31) comprising a first surface (311) and a second surface (312), the first surface (311) being close to the light source (2), the second surface (312) facing away from the light source (2), the second surface (312) being an X-or Y-asymmetric free-form surface.

5. The oblique-projection vehicle-mounted lens and vehicle according to claim 2, wherein the illumination lens group (3) comprises an illumination second lens (32), the illumination second lens (32) is arranged on one side of the illumination first lens (31) facing away from the light source (2), the illumination second lens (32) comprises a third surface (321) and a fourth surface (322), and at least one of the surfaces (311, 312, 321, 322) is an asymmetric free-form surface in the X direction or the Y direction.

6. The oblique lens and the vehicle according to claim 5, wherein at least one of the surface types of the first surface (311), the second surface (312), the third surface (321) and the fourth surface (322) is an XY polynomial free-form surface, and the following formula is satisfied:

7. The oblique-projection vehicle-mounted lens according to claim 1, further comprising a diaphragm (6), the diaphragm (6) being arranged between the picture element (4) and the imaging lens group (5);

or the diaphragm (6) is arranged at one side of the imaging lens group (5) away from the pixel (4) along the optical axis direction;

or the diaphragm (6) is arranged inside the imaging lens group (5).

8. A tilt-feed vehicle lens according to claim 1, further comprising a circuit board (1), the circuit board (1) being electrically connected to the light source (2).

9. The oblique-projection vehicle-mounted lens according to claim 1, characterized in that the material of the lenses in the illumination lens group (3) and the imaging lens group (5) comprises any one or more of glass and plastic.

10. A vehicle characterized in that the oblique-projection vehicle-mounted lens according to any one of claims 1 to 9 is mounted on a vehicle body.