WO2024065628A1

WO2024065628A1 - Vehicle lamp optical system

Info

Publication number: WO2024065628A1
Application number: PCT/CN2022/123124
Authority: WO
Inventors: 杨传银
Original assignee: 珠海水立方照明科技有限公司
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2024-04-04
Also published as: CN116097033A

Abstract

A vehicle lamp optical system. A reflector (10) comprises at least a main reflecting surface (11) and a 15° additional reflecting surface (12). The main reflecting surface (11) is disposed as a parabola stretching surface, the parabola stretching surface is formed by extending a parabola (111), which has a formula of y2＝2px, along the length direction of a long strip-shaped LED lamp bead (20), a focal line (112) and a vertex line (113) are formed on the parabola stretching surface, and a virtual surface is formed between the focal line (112) and the vertex line (113); a light-emitting surface of the long-strip-shaped LED lamp bead (20) faces the main reflecting surface (11), one edge (21) of the light-emitting surface of the long strip-shaped LED lamp bead (20) coincides with the focal line (112), and an included angle of 60°-75° is formed between the central axis (22) of the light-emitting surface of the long strip-shaped LED lamp bead (20) and the virtual surface; and the 15° additional reflecting surface (12) is provided on the inner surface of the main reflecting surface (11), and an included angle of 15° is formed between the inner surface of the 15° additional reflecting surface (12) and the inner surface of the main reflecting surface (11). The described vehicle lamp optical system has an ingenious structural design and has a miniaturized structure, the difficulty of design of the existing vehicle lamp is greatly reduced, and manufacturing and processing are simple. Moreover, the lighting effect is high, and the vehicle lamp optical system is particularly beneficial in the development of modern vehicle types.

Description

A vehicle light optical system

Technical Field

The invention relates to the technical field of automobile lighting, and in particular to an automobile light optical system.

Background technique

At present, due to the importance of LED car headlight design, people have studied many design methods for LED car headlights: such as projection reflector, ellipsoid reflector, quasi-ellipsoid reflector, lens reflector and other reflector design ideas, but all design methods have imperfect factors. At present, the LED car headlights actually used can be simply summarized into two types: projection type and reflection type.

The optical system of projection-type automobile headlights is mainly composed of a light source, an ellipsoidal reflector, a sunshade, and an optical lens. The optical lens generally adopts an aspherical lens or a free-form lens. The light source is placed at the first focus of the ellipse, and the sunshade is placed at the second focus. The focus of the lens coincides with the second focus of the ellipse. The cutoff line of the projection-type automobile headlight is determined by the sunshade, so a perfect light and dark cutoff line can be obtained. However, because the sunshade blocks part of the light, the light energy utilization rate of the projection-type automobile headlight is reduced.

Reflective automobile headlamp optical systems can be divided into two types in terms of shape: parabolic type and free-form type. The parabolic type does not conform to modern car body design due to the presence of a sunshade and a light distribution mirror, and the light energy utilization rate is not high, so it is basically not used now. The free-form type automobile headlamp is mainly composed of a light source, a free-form type reflector and a smooth optical lens. The characteristic of this headlamp is that the light distribution task is completely completed by the free-form type reflector, and the smooth optical lens has no pattern on the surface, but only serves as the external seal of the automobile headlamp; because the free-form type reflector is very complex in design and has high processing precision, the size of the automobile headlamp is generally large, which is not conducive to the design of the automobile body.

Summary of the invention

In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a new type of headlight optical system. The headlight optical system has an ingenious structural design and a miniaturized structure, which greatly reduces the difficulty of existing headlight design and is simple to manufacture. In addition, the headlight optical system has high luminous efficiency, which is particularly beneficial to the development of modern car models.

To solve the above problems, the technical solution adopted by the present invention is as follows:

A vehicle light optical system suitable for a low beam lamp, comprising a reflector and a long strip LED lamp bead, wherein the reflector comprises at least a main reflective surface and a 15° additional reflective surface, wherein the main reflective surface is set as a parabola stretching surface, wherein the parabola stretching surface is formed by extending the parabola along the length direction of the long strip LED lamp bead, and the parabola satisfies the formula

Among them, p＞2, the parabolic stretching surface forms a focal line and a vertex line, and a virtual surface is formed between the focal line and the vertex line; the light-emitting surface of the elongated LED lamp bead faces the main reflective surface, and an edge of the light-emitting surface of the elongated LED lamp bead coincides with the focal line, and the central axis of the light-emitting surface of the elongated LED lamp bead forms an angle of 60°-75° with the virtual surface; the 15° additional reflective surface is arranged on the inner surface of the main reflective surface, and the inner surface of the 15° additional reflective surface intersects with the inner surface of the main reflective surface to form an angle of 15°.

Furthermore, the parabola stretching surface is formed by connecting the main parabola and the auxiliary parabola extending along the length direction of the long strip LED lamp bead, and the main parabola satisfies the formula

The auxiliary parabola satisfies the formula

Among them, p＞2.

Furthermore, the reflector further comprises auxiliary reflecting surfaces, the auxiliary reflecting surfaces are located on both sides of the long strip LED lamp bead in the length direction, and the auxiliary reflecting surfaces are transitionally connected to the main reflecting surface.

Furthermore, the auxiliary reflective surface is set as a parabolic stretching surface, and the parabola satisfies the formula y2=2px, wherein p>2.

Furthermore, the focal line formed by the main reflecting surface crosses the focal line formed by the auxiliary reflecting surface perpendicularly.

Furthermore, the main reflective surface is set as a single-sided parabolic stretching surface, and the headlight optical system also includes a lamp bead mounting plate, the long strip LED lamp beads are mounted on the lamp bead mounting plate, the lamp bead mounting plate is directly opposite to the main reflective surface, and the lamp bead mounting plate is transitionally connected to the auxiliary reflective surface and the main reflective surface.

Furthermore, the vehicle light optical system further comprises a lens, and the lens is arranged at an opening formed after the lamp bead mounting plate, the auxiliary reflecting surface, and the main reflecting surface are transitionally connected.

Furthermore, the outer wall surface of the lens is a concave-convex light distribution pattern surface or a flat surface.

Furthermore, the 15° additional reflective surface is set as a parabola stretching surface, and the parabola satisfies the formula

Among them, p＞2.

A headlight optical system suitable for high beam/fog lamp/signal lamp, comprising a reflector and a long strip LED lamp bead, wherein the reflector comprises at least a main reflective surface, and the main reflective surface is set as a parabola stretching surface, wherein the parabola stretching surface is formed by extending the parabola along the length direction of the long strip LED lamp bead, and the parabola satisfies the formula

Among them, p＞2, the parabolic stretching surface forms a focal line and a vertex line, and a virtual surface is formed between the focal line and the vertex line; the light-emitting surface of the elongated LED lamp bead faces the main reflecting surface, and the light-emitting surface of the elongated LED lamp bead surrounds the focal line, and the central axis of the light-emitting surface of the elongated LED lamp bead forms an angle of 60°-75° with the virtual surface.

Compared with the prior art, the present invention has the following beneficial effects:

The present invention provides a novel low-beam headlight optical system, comprising a reflector and a long strip LED lamp bead, the reflector comprising a main reflective surface and a 15° additional reflective surface, the main reflective surface is set as a parabolic stretching surface, the parabolic stretching surface has a unique reflection law, which is very beneficial to the design of the headlight, and is characterized in that: the parabolic stretching surface is formed by a parabola extending straight along the length direction of the long strip LED lamp bead, a parabola has a focus, the parabolic stretching surface can form a focal line, an edge of the light-emitting surface of the long strip LED lamp bead coincides with the focal line, and the light-emitting surface of the long strip LED lamp bead faces the parabolic stretching surface, and the light is reflected to form a clear light-dark cutoff line.

Therefore, since the main reflective surface is set as a parabolic stretching surface, the 15° additional reflective surface is set on the inner surface of the main reflective surface, and the inner surface of the 15° additional reflective surface intersects with the inner surface of the main reflective surface to form a 15° angle. Such a structural setting enables the main reflective surface of the reflector to form a horizontal line in the light-dark cut-off line, and the 15° additional reflective surface to form a 15-degree line in the light-dark cut-off line. The light-dark cut-off line of the low-beam headlight can be formed without the use of a sunshade. The design is ingenious and the structure is miniaturized, which greatly reduces the difficulty of existing headlight design.

In addition, the LED lamp beads adopt a straight-line shaped light source, which can be composed of multiple LED lamps connected in series in a long strip shape. LED lamp beads with small dimensions in the width direction of the luminous surface are preferably selected. The parabolic stretching surface is formed by a parabola extending straight along the length direction of the long strip LED lamp beads. The luminous surface of the LED lamp bead is rotated 15°-30° around the long axis of the LED lamp bead and then turned toward the parabolic stretching surface, so that the main part of the light emitted by the luminous surface of the LED lamp bead is irradiated onto the main reflective surface, and the light efficiency is high.

The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of the structure of a vehicle light optical system in a first embodiment of the present invention;

FIG2 is a schematic diagram of the structure of the vehicle light optical system in the first embodiment of the present invention (after hiding the lamp bead mounting plate);

FIG3 is a cross-sectional view of a vehicle light optical system in Embodiment 1 of the present invention;

FIG4 is a schematic diagram of a simulated light distribution effect of a low beam optical system in Embodiment 1 of the present invention;

FIG5 is a schematic diagram of a simulated light distribution effect of a high beam optical system in Embodiment 1 of the present invention;

FIG6 is a schematic diagram of a simulated light distribution effect of a fog light optical system in Embodiment 1 of the present invention;

FIG7 is a schematic diagram of the structure of the vehicle light optical system in the second embodiment of the present invention;

FIG8 is a schematic diagram of the structure of the vehicle light optical system in the second embodiment of the present invention (after the lamp bead mounting plate is hidden);

FIG9 is a cross-sectional view of a vehicle light optical system in a second embodiment of the present invention;

Description of Figure Numbers:

10-reflector, 11-main reflective surface, 111-parabola, 112-focal line, 113-vertex line, 12-15° additional reflective surface, 13-auxiliary reflective surface, 14-lamp bead mounting plate, 20-long strip LED lamp bead, 21-edge, 22-central axis, 30-lens, 31-inner wall surface, 32-outer wall surface;

100-reflector, 101-main reflective surface, 1011-first main reflective surface, 1011a-main parabola, 1011b-focal line, 1011c-vertex line, 1012-second main reflective surface, 1012a-auxiliary parabola, 1013a-connecting line, 102-15° additional reflective surface, 103-auxiliary reflective surface, 104-lamp bead mounting plate, 200-long strip LED lamp bead, 201-edge, 202-central axis, 300-lens, 301-inner wall surface, 302-outer wall surface;

Detailed ways

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

Embodiment 1:

Referring to Figures 1 to 6, Figure 1 is a schematic diagram of the structure of the headlight optical system in Example 1 of the present invention, Figure 2 is a schematic diagram of the structure of the headlight optical system in Example 1 of the present invention (after hiding the lamp bead mounting plate), Figure 3 is a cross-sectional view of the headlight optical system in Example 1 of the present invention, Figure 4 is a schematic diagram of the simulated light distribution effect of the low beam optical system in Example 1 of the present invention, Figure 5 is a schematic diagram of the simulated light distribution effect of the high beam optical system in Example 1 of the present invention, and Figure 6 is a schematic diagram of the simulated light distribution effect of the fog light optical system in Example 1 of the present invention.

This embodiment provides a low-beam optical system, including a reflector 10 and a long strip-shaped LED lamp bead 20 .

In this embodiment, the reflector 10 includes at least a main reflective surface 11 and a 15° additional reflective surface 12, the main reflective surface 11 is set as a parabola stretching surface, wherein the parabola stretching surface is a parabola 111 extending straight along the length direction of the long strip LED lamp bead 20, and the parabola 111 satisfies the formula

Wherein, p＞2, the parabola stretching surface is formed with a focus line 112 and a vertex line 113 , and a virtual surface is formed between the focus line 112 and the vertex line 113 .

Here we describe the difference between a "parabola" and a "parabola stretch surface". A parabola is a surface formed by a parabola rotating around its axis and has only one focus; while a parabola stretch surface is a surface formed by stretching a parabola along a perpendicular line to the axis of the parabola. The focus of the parabola forms a focal line along the stretching direction, that is, the parabola stretch surface has a focal line, and the vertex of the parabola forms a vertex line along the stretching direction, that is, the parabola stretch surface has a vertex line.

In this embodiment, the light-emitting surface of the elongated LED lamp bead 20 faces the main reflective surface 11, and an edge 21 of the light-emitting surface of the elongated LED lamp bead 20 coincides with the above-mentioned focal line 112, and the central axis 22 of the light-emitting surface of the elongated LED lamp bead 20 forms an angle of 60°-75° with the virtual plane (the virtual plane formed between the focal line 112 and the vertex line 113).

In this embodiment, the 15° additional reflecting surface 12 is disposed on the inner surface of the main reflecting surface 11 , and the inner surface of the 15° additional reflecting surface 12 intersects with the inner surface of the main reflecting surface 11 to form an angle of 15°.

The novel low-beam optical system comprises a reflector 10 and a long strip LED lamp bead 20. The reflector 10 comprises a main reflective surface 11 and a 15° additional reflective surface 12. The main reflective surface 11 is set as a parabolic stretching surface. The parabolic stretching surface has a unique reflection law, which is very beneficial to the design of the vehicle lamp. The characteristics are: the parabolic stretching surface is formed by a parabola 111 extending straight along the length direction of the long strip LED lamp bead 20. A parabola 111 has a focus, and the parabolic stretching surface can form a focal line 112. An edge 21 of the light-emitting surface of the long strip LED lamp bead 20 coincides with the focal line 112, and the light-emitting surface of the long strip LED lamp bead 20 faces the parabolic stretching surface. When the light is reflected, a clear light-dark cutoff line can be formed.

Therefore, since the main reflective surface 11 is set as a parabolic stretching surface, the 15° additional reflective surface 12 is set on the inner surface of the main reflective surface 11, and the inner surface of the 15° additional reflective surface 12 intersects with the inner surface of the main reflective surface 11 to form a 15° angle. Such a structural setting enables the main reflective surface 11 of the reflector 10 to form a horizontal line in the light-dark cut-off line, and the 15° additional reflective surface 12 to form a 15-degree line in the light-dark cut-off line. Please refer to the schematic diagram of the simulated light distribution effect of the low-beam optical system in Figure 4 for details. The low-beam headlight light-dark cut-off line can be formed without using a sunshade. The design is ingenious and the structure is miniaturized, which greatly reduces the difficulty of existing headlight design.

In addition, the LED lamp bead adopts a straight-line shaped light source, which can be composed of multiple LED lamps connected in series and is in the shape of a long strip. LED lamp beads with small dimensions in the width direction of the luminous surface are preferably selected. The parabolic stretching surface is formed by a parabola 111 extending straight along the length direction of the long strip LED lamp bead 20. The luminous surface of the long strip LED lamp bead 20 is rotated 15°-30° around its long axis (axis line in the length direction) and then turned toward the parabolic stretching surface, so that the main part of the light emitted from the luminous surface of the long strip LED lamp bead 20 is irradiated on the main reflecting surface 11, so that the lighting efficiency is maximized.

In this embodiment, preferably, the reflector 10 also includes two auxiliary reflective surfaces 13, which are located on both sides of the length direction of the long strip LED lamp beads 20. The auxiliary reflective surfaces 13 mainly play a supplementary and regulating role in light, and the two auxiliary reflective surfaces 13 are respectively connected to the two side ends of the main reflective surface 11 by arc transition to avoid abrupt corners at the connection, so that the structural setting of the entire reflector 10 is coordinated and beautiful.

In this embodiment, preferably, the auxiliary reflective surface 13 is set as a parabolic stretching surface, and on another coordinate axis, its parabola also satisfies the formula

Among them, p＞2, then the auxiliary reflecting surface 13 also forms a focal line (not shown in the figure), and the two auxiliary reflecting surfaces 13 are respectively connected to the two side ends of the main reflecting surface 11 by arc transition, avoiding abrupt corners at the connection, and further making the structural setting of the entire reflector 10 coordinated, beautiful and miniaturized; in addition, the auxiliary reflecting surface 13 is not limited to being set as a parabolic stretching surface.

Further preferably, the focal line 111 formed by the main reflecting surface 11 and the focal line formed by the auxiliary reflecting surface 13 are perpendicularly crossed, which not only makes the structure of the reflector 10 coordinated, but also makes the supplementary adjustment effect of light better.

In the present embodiment, preferably, the main reflective surface 11 is generally set as a single-sided parabolic stretching surface, which is conducive to the miniaturization of the structure. The low beam light will be provided with a lamp bead mounting plate 14, and the lamp bead mounting plate 14 is generally set as a plane for mounting long strip LED lamp beads 20. The lamp bead mounting plate 14 is directly opposite to the main reflective surface 11, and the lamp bead mounting plate 14 is transitionally connected to the two side ends of the two auxiliary reflective surfaces 13, and the lamp bead mounting plate 14 is transitionally connected to the upper end of the main reflective surface 11.

In this embodiment, preferably, the low light optical system also includes a lens 30, which is arranged at an opening formed by the transition connection between the lamp bead mounting plate 14 and the two auxiliary reflective surfaces 13 and the main reflective surface 11, and the lens 30 is used to further supplement the adjustment of the light.

Further preferably, the inner wall surface 31 of the lens 30 is a plane, but the inner wall surface 31 is not limited to a plane, and the outer wall surface 32 is a concave-convex light distribution pattern surface or a plane. The light distribution pattern of the outer wall surface 32 adopts a pattern surface with refraction and diffusion functions to meet the standard requirements of vehicle lamps.

In this embodiment, preferably, the 15° additional reflective surface 12 is set as a parabolic stretching surface, and on another coordinate axis, its parabola also satisfies the formula

Wherein, p＞2; the inner surface of the 15° additional reflective surface 12 intersects with the inner surface of the main reflective surface 11 to form an angle of 15°. In addition, the 15° additional reflective surface 12 is not limited to being set as a parabolic stretching surface.

A variation of the present embodiment is to provide a high beam optical system or a car signal light optical system, the difference between the high beam optical system and the above-mentioned low beam optical system is that the 15° additional reflective surface 12 is cancelled, so that the main reflective surface 11 of the reflector 10 forms a horizontal line in the light-dark cut-off line, specifically refer to the schematic diagram of the simulated light distribution effect of the low beam optical system in Figure 5, and the light-emitting surface of the long LED lamp bead 20 surrounds the focal line 111 formed by the main reflective surface 11, that is, the focal line 111 is closer to the inside than the edge 21 of the light-emitting surface of the long LED lamp bead 20.

Another variation of the present embodiment is that a fog light optical system is further provided, in which the 15° additional reflective surface 12 is also cancelled, so that the main reflective surface 11 of the reflector 10 forms a horizontal line in the light-dark cut-off line, specifically refer to the schematic diagram of the simulated light distribution effect of the low beam optical system in FIG6 , and the light-emitting surface of the long LED lamp bead 20 surrounds the focal line 111 formed by the main reflective surface 11, that is, the focal line 111 is closer to the inside than the edge 21 of the light-emitting surface of the long LED lamp bead 20.

Embodiment 2:

7 to 9, FIG. 7 is a schematic diagram of the structure of the headlight optical system in the second embodiment of the present invention, FIG. 8 is a schematic diagram of the structure of the headlight optical system in the second embodiment of the present invention (after hiding the lamp bead mounting plate), and FIG. 9 is a cross-sectional view of the headlight optical system in the second embodiment of the present invention.

The difference between this embodiment and the above-mentioned embodiment 1 is that, as shown in Figures 7 to 9, the main reflecting surface 101 of the reflector 100 is composed of a plurality of main reflecting surface sections, each of which is easy to demold, thereby facilitating the production of the reflector 100. For example, the main reflecting surface 101 includes a first main reflecting surface 1011 and a second main reflecting surface 1012.

The first main reflecting surface 1011 and the second main reflecting surface 1012 are set as a combined parabola stretching surface, which is formed by the main parabola 1011a and the auxiliary parabola 1012a connected by the connecting line 1013a extending along the length direction of the long strip LED lamp bead 200, forming a focal line 1011b and a vertex line 1011c, and the main parabola 1011a satisfies the formula

The auxiliary parabola 1012a satisfies the formula

Wherein, p＞2; if the main reflecting surface 101 further includes a third main reflecting surface or more, the value of b can be changed.

The rest is the same as the above-mentioned embodiment 1 and will not be described again here.

The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

A vehicle light optical system, characterized in that it comprises a reflector and a long strip of LED lamp beads,

The reflector at least includes a main reflective surface and a 15° additional reflective surface, the main reflective surface is set as a parabola stretching surface, wherein the parabola stretching surface is formed by extending the parabola along the length direction of the long strip LED lamp bead, the parabola satisfies the formula y=2px, wherein p>2, the parabola stretching surface is formed with a focal line and a vertex line, and a virtual surface is formed between the focal line and the vertex line;

The light-emitting surface of the long strip LED lamp bead faces the main reflective surface, and one edge of the light-emitting surface of the long strip LED lamp bead coincides with the focal line, and the central axis of the light-emitting surface of the long strip LED lamp bead forms an angle of 60°-75° with the virtual plane;

The 15° additional reflecting surface is arranged on the inner surface of the main reflecting surface, and the inner surface of the 15° additional reflecting surface intersects with the inner surface of the main reflecting surface to form an angle of 15°.
The vehicle light optical system according to claim 1 is characterized in that: the parabolic stretching surface is formed by a connected main parabola and an auxiliary parabola extending along the length direction of the long strip LED lamp bead, the main parabola satisfies the formula y=2px, and the auxiliary parabola satisfies the formula y=2p(x±b), wherein p＞2.
The vehicle light optical system according to claim 1 or 2 is characterized in that: the reflector further comprises an auxiliary reflective surface, the auxiliary reflective surface is located on both sides of the length direction of the long strip LED lamp bead, and the auxiliary reflective surface is transitionally connected to the main reflective surface.
The vehicle light optical system according to claim 3 is characterized in that the auxiliary reflective surface is set as a parabola stretching surface, and the parabola satisfies the formula y=2px, where p>2.
The vehicle light optical system according to claim 4 is characterized in that the focal line formed by the main reflecting surface and the focal line formed by the auxiliary reflecting surface intersect vertically.
The vehicle light optical system according to claim 3 is characterized in that: the main reflective surface is set as a single-sided parabolic stretching surface, the long strip LED lamp beads are installed on a lamp bead mounting plate, the lamp bead mounting plate is directly opposite to the main reflective surface, and the lamp bead mounting plate is transitionally connected to the auxiliary reflective surface and the main reflective surface.
The vehicle light optical system according to claim 6 is characterized in that: the vehicle light optical system further comprises a lens, and the lens is arranged at an opening formed after the lamp bead mounting plate, the auxiliary reflecting surface, and the main reflecting surface are transitionally connected.
The vehicle light optical system according to claim 7 is characterized in that the outer wall surface of the lens is a concave-convex light distribution pattern surface or a flat surface.
The vehicle light optical system according to claim 1 or 2, characterized in that the 15° additional reflective surface is set as a parabolic stretching surface, and the parabola satisfies the formula y=2px, where p>2.
A vehicle light optical system, characterized in that it comprises a reflector and a long strip of LED lamp beads,

The reflector at least includes a main reflective surface, and the main reflective surface is set as a parabola stretching surface, wherein the parabola stretching surface is formed by extending the parabola along the length direction of the long strip LED lamp bead, and the parabola satisfies the formula y=2px, wherein p>2, and the parabola stretching surface is formed with a focal line and a vertex line, and a virtual surface is formed between the focal line and the vertex line;

The light-emitting surface of the long strip LED lamp bead faces the main reflective surface, and the light-emitting surface of the long strip LED lamp surrounds the focal line, and the central axis of the light-emitting surface of the long strip LED lamp bead forms an angle of 60°-75° with the virtual surface.