WO2024148842A1

WO2024148842A1 - Illumination device and vehicle lamp

Info

Publication number: WO2024148842A1
Application number: PCT/CN2023/116983
Authority: WO
Inventors: 张洁; 董世琨; 陈佳缘; 周浩; 祝贺; 桑文慧; 张玉玲
Original assignee: 华域视觉科技(上海)有限公司
Priority date: 2023-01-11
Filing date: 2023-09-05
Publication date: 2024-07-18
Also published as: CN118361683A

Abstract

The present application relates to the technical field of vehicle lamps, and provides an illumination device and a vehicle lamp. An optical lens in the illumination device is improved, such that the optical lens has a first total reflection surface. The first total reflection surface can be used to replace an incident surface in an existing optical lens to realize unidirectional collimation and total reflection of light from a light source, so that the position of an incident surface of the optical lens can be changed while the illumination effect is ensured, and components provided for cooperating with the optical lens can also be arranged in other directions perpendicular to a front-rear direction instead of being arranged in the front-rear direction, thereby preventing the illumination device from being too large in the front-rear direction, and reducing the limitation on the arrangement of the illumination device.

Description

Lighting device and vehicle lamp

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the priority of Chinese patent application number 2023100638505, entitled “A lighting device and a vehicle lamp”, filed with the Chinese Patent Office on January 11, 2023, the entire contents of which are incorporated by reference into this application.

Technical Field

The present application relates to the technical field of vehicle lamps, and in particular to a lighting device and a vehicle lamp.

Background technique

With the development of social economy, the automobile industry has also developed accordingly. With the continuous development of automobile lighting technology, more requirements have been put forward for the functions of car lights. In lighting devices that realize the lighting function of car lights, optical elements with collimation functions are usually set to obtain approximately parallel outgoing light, thereby obtaining better lighting effects.

Existing optical lenses with a collimating function usually have a light input portion and a light output portion located on opposite sides of the optical lens. The light input portion can achieve unidirectional collimation in the horizontal direction, and the light output portion can achieve unidirectional collimation in the vertical direction. This also limits other components that are configured to cooperate with the optical lens to be distributed only on opposite sides of the optical lens, thereby forming an optical system arranged front to back, making the size of the entire lighting device in the front to back direction too large, which is not conducive to the layout of the lighting device and the car lights.

Application Contents

The purpose of the present application is to provide a lighting device and a vehicle lamp in view of the deficiencies in the above-mentioned prior art.

To achieve the above purpose, the technical solution adopted in the embodiment of the present application is as follows:

In one aspect of an embodiment of the present application, a lighting device is provided, comprising a light source and an optical lens arranged on the light emitting side of the light source, the optical lens having a light incident surface, a first total reflection surface capable of collimating the light along a first direction, and a light emitting surface capable of collimating the light along a second direction, which are arranged in sequence along the light path, the first direction and the second direction are perpendicular or approximately perpendicular to each other, and light emitted by the light source incident through the light incident surface is reflected by the first total reflection surface to the light emitting surface and collimated to emit.

Optionally, a section line of the first total reflection surface in the first direction is a curve, and a section line of the first total reflection surface in the second direction is a straight line or an approximate straight line.

Optionally, the surface shape of the first total reflection surface is a cylinder or a quasi-cylindrical surface.

Optionally, the optical lens further has a primary reflection surface located between the light incident surface and the first total reflection surface along the light path direction, and the light emitted by the light source incident through the light incident surface is reflected by the primary reflection surface to the first total reflection surface.

Optionally, the primary reflection surface is a total reflection surface or a reflection mirror surface with a reflective layer.

Optionally, the lighting device further includes a primary reflector having a primary reflective surface, the primary reflector is located between the light source and the optical lens, and is used to reflect the light emitted by the light source to the light incident surface of the optical lens.

Optionally, the lighting device further comprises a cutoff line structure located at the light emitting side of the light source, the cutoff line structure is located at or near the focus of the optical lens, and the cutoff line structure is used to form a light emitting light shape having a cutoff line.

Optionally, when the lighting device further includes a primary reflective surface, the cut-off line structure is arranged at or near a boundary of the primary reflective surface on a side close to the light source.

Optionally, the optical lens further has at least one second total reflection surface located on the optical path, and the at least one second total reflection surface is used to adjust the optical path of the light emitted by the light source in the optical lens.

Optionally, the surface shape of the primary reflecting surface is a parabola, a quasi-parabola, an ellipsoid or a quasi-ellipsoid.

Another aspect of the embodiments of the present application provides a vehicle lamp comprising any one of the above-mentioned lighting devices.

The beneficial effects of this application include:

The present application provides a lighting device and a vehicle lamp. By improving the optical lens in the lighting device, the optical lens has a first total reflection surface. The first total reflection surface can replace the light incident surface in the existing optical lens to achieve unidirectional collimation and total reflection of the light emitted by the light source. Therefore, while ensuring the lighting effect, the position of the light incident surface of the optical lens can be changed, so that the components set in conjunction with the optical lens no longer have to be arranged in the front-to-back direction, but can also be arranged in other directions such as perpendicular to the front-to-back direction. Therefore, the size of the lighting device in the front-to-back direction can be avoided to be too large, and the restrictions on the layout of the lighting device can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic diagram of a structure of an optical lens provided in an embodiment of the present application;

FIG2 is a second schematic diagram of the structure of an optical lens provided in an embodiment of the present application;

FIG3 is a third schematic diagram of the structure of an optical lens provided in an embodiment of the present application;

FIG4 is a fourth structural schematic diagram of an optical lens provided in an embodiment of the present application;

FIG5 is one of the structural schematic diagrams of a lighting device provided in an embodiment of the present application;

FIG6 is a second schematic diagram of the structure of a lighting device provided in an embodiment of the present application;

FIG7 is a schematic diagram of a light path of a lighting device provided in an embodiment of the present application;

FIG8 is one of the structural schematic diagrams of another lighting device provided in an embodiment of the present application;

FIG9 is a second schematic diagram of the structure of another lighting device provided in an embodiment of the present application;

FIG10 is a schematic diagram of a light path of another lighting device provided in an embodiment of the present application;

FIG11 is a schematic diagram of the structure of another optical lens provided in an embodiment of the present application;

FIG12 is a schematic diagram of a light path of another lighting device provided in an embodiment of the present application;

FIG13 is a schematic diagram of the structure of another optical lens provided in an embodiment of the present application;

FIG14 is a schematic diagram of a light path of another lighting device provided in an embodiment of the present application;

FIG15 is a schematic diagram of a structure in which an optical lens and a primary reflective surface are separately arranged in a lighting device provided in an embodiment of the present application;

FIG16 is a schematic structural diagram of a lighting device provided in an embodiment of the present application, including a low beam module and a high beam module;

FIG. 17 is a schematic diagram of a low beam light shape formed when a lighting device provided in an embodiment of the present application is used as a low beam module.

Icons: 10-lighting device; 11-high beam module; 12-low beam module; 100-optical lens; 110-light incident surface; 120-first total reflection surface; 130-light exit surface; 140-cut-off line structure; 141-focal position; 150-primary reflection surface; 160-second total reflection surface; 200-heat sink; 210-circuit board; 220-light source.

Detailed ways

In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. It should be noted that, in the absence of conflict, the various features in the embodiments of the present application can be combined with each other, and the combined embodiments are still within the scope of protection of the present application.

In the description of the present application, the terms “first”, “second”, “third”, etc. are only used to distinguish the descriptions and should not be understood as indicating or implying relative importance.

In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, it can be understood in a broad sense. The specific meanings of the above terms in this application should be understood based on the specific circumstances.

It should be understood that, in order to facilitate the description of the present application and simplify the description, the terms "front and rear" refer to the front and rear directions of the lighting device along the light-emitting direction, the terms "left and right" refer to the left and right directions of the lighting device itself, and the terms "up and down" refer to the up and down directions of the lighting device itself, which are usually roughly the same as the front, back, left, right, up and down directions of the vehicle; the terms are based on the orientation or positional relationship shown in the accompanying drawings, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application; moreover, the orientation terms for the lighting device of the present application should be understood in conjunction with the actual installation status.

In this application, light shape refers to the projection shape of the light from the headlights on the vertical plane light distribution screen 25m away from the front of the vehicle, and the cutoff line refers to the dividing line where the light is projected onto the light distribution screen and the visual perception of the significant change in light and dark. The main low beam light shape is the central area light shape of the low beam light shape with high illumination, and the auxiliary low beam light shape is the widened area light shape of the low beam light shape, so that the left and right illumination range of the low beam light shape meets the requirements. A total reflection surface refers to a reflection surface that can cause as much light as possible to be fully reflected when it hits the reflection surface.

In one aspect of an embodiment of the present application, a lighting device is provided, comprising a light source and an optical lens disposed on the light emitting side of the light source, wherein the optical lens is an integrally formed part of a transparent material, and the optical lens can play a role of bidirectional collimation (i.e., collimating the light emitted by the light source along two mutually perpendicular or approximately perpendicular directions) for the light emitted by the light source, thereby obtaining converged approximately parallel emitted light, thereby obtaining a better lighting effect. Wherein, approximately perpendicular means that the angle between the two directions is 90°±10°.

Please refer to Figures 1 and 2. The optical lens 100 has a light incident surface 110, a first total reflection surface 120 and a light emitting surface 130 which are arranged in sequence along the light path, wherein the first total reflection surface 120 can realize the function of collimating the light emitted by the light source 220 along the first direction, and the light emitting surface 130 can realize the function of collimating the light emitted by the light source 220 along the second direction, and the first direction and the second direction are two directions perpendicular or approximately perpendicular to each other, so that the bidirectional collimation function of the optical lens 100 is realized by the first total reflection surface 120 and the light emitting surface 130, thereby obtaining converged approximately parallel emitted light and obtaining a better lighting effect.

In actual use, the light emitted by the light source 220 enters the optical lens 100 through the light incident surface 110 of the optical lens 100 and propagates to the first total reflection surface 120. The first total reflection surface 120 can not only collimate the incident light along the first direction, but also make the incident light be totally reflected at the first total reflection surface 120, thereby reducing light loss. The light emitted by the light source 220 propagates to the light emitting surface 130 after being totally reflected at the first total reflection surface 120, and the light emitting surface 130 collimates the light along the second direction. Therefore, after collimation in the first direction and the second direction, the light emitted by the light source 220 is finally emitted from the light emitting surface 130, and the light emitting light shape of the lighting device 10 is formed accordingly.

Since the first total reflection surface 120 can realize collimation along the first direction, the first total reflection surface 120 can replace the incident light surface that realizes unidirectional collimation in the existing optical lens. The total reflection function can change the position of the light incident surface 110 on the optical lens 100, that is, change the position of the light incident surface 110 relative to the light emitting surface 130, so that the light incident surface 110 and the light emitting surface 130 are no longer necessarily located on opposite sides of the optical lens 100. In other words, due to the total reflection function of the first total reflection surface 120, the light incident direction can be changed, so that the components provided in conjunction with the optical lens 100 no longer have to be arranged along the front-to-back direction, but can also be arranged in directions other than the front-to-back direction. For ease of understanding, borrowing the direction shown in Figure 1, the light incident surface and the light emitting surface of the existing optical lens are arranged along the y direction (front-to-back direction), thereby limiting the light to be incident on the optical lens from the y direction, and also thereby requiring other components to be arranged along the y direction to cooperate with the optical lens, resulting in the formed lighting device 10 being too large in size in the y direction as a whole, thereby subjecting the layout of the lighting device to more restrictions. As shown in FIG. 1 and FIG. 2 , the optical lens 100 of the present application can change the position of the light incident surface 110 due to the presence of the first total reflection surface 120, so that the light incident surface 110 is located at the bottom surface of the optical lens 100. Therefore, when arranged, the components located on the light emitting side of the optical lens 100 can be arranged along the y direction with the optical lens 100, and the components located on the light incident side of the optical lens 100 can be arranged along the z direction with the optical lens 100. Therefore, the size of the lighting device 10 in the y direction can be avoided to be too large.

It should be noted that the first direction may be a horizontal direction, and the second direction may be a vertical direction; of course, in other implementations, the first direction may also be a vertical direction, and the second direction may be a horizontal direction.

Optionally, since the first total reflection surface 120 can achieve collimation of the light in the first direction, that is, unidirectional collimation, it can be understood as follows: as shown in Figure 1, when the first direction is the x direction and the second direction is the z direction, the section of the first total reflection surface 120 in the first direction is a curve, more specifically, a convex curve (the convex here refers to the convexity relative to the optical lens 100), thereby converging the incident light and also having a certain collimation effect on the divergent light. The section of the first total reflection surface 120 in the second direction is a straight line or an approximate straight line. Therefore, the first total reflection surface 120 has no collimation effect on the light in the second direction. Therefore, the first total reflection surface 120 can have a unidirectional collimation effect on the light emitted by the light source 220 in the first direction.

Similarly, since the light emitting surface 130 can realize collimation of the light emitted by the light source 220 in the second direction, that is, unidirectional collimation, it can be understood as follows: as shown in FIG. 1, when the first direction is the x direction and the second direction is the z direction, the section line of the light emitting surface 130 in the second direction is a curve, more specifically, a convex curve (the convex here refers to the convexity relative to the optical lens 100), thereby, the incident light will be converged, but at this time the light is refracted at the light emitting surface 130, so convergence means that the degree of deflection of the light is relatively large, and it can also be The divergent light has a certain collimating effect, and the section of the light emitting surface 130 in the first direction is a straight line or an approximate straight line, so that the light emitting surface 130 has a much weaker ability to deflect light in the first direction than in the second direction. Therefore, the light emitting surface 130 has no or basically no ability to change the degree of light deflection in the first direction, and also has no collimating effect on the light, that is, the light is relatively divergent in the first direction. Therefore, the light emitting surface 130 can play a unidirectional collimating role on the light emitted by the light source 220 in the second direction.

Optionally, as shown in FIGS. 1 to 16 , the surface shape of the first total reflection surface 120 is a cylinder or a quasi-cylindrical surface. For ease of understanding, the formation of the first total reflection surface 120 can be regarded as a curve obtained by unidirectional stretching. Specifically, as shown in FIG. 1 , the curve b is unidirectionally stretched along the stretching direction a to form a cylinder or a quasi-cylindrical surface. In addition, it should be understood that in order to ensure that the light emitted by the light source 220 can be totally reflected on the first total reflection surface 120, the angle between the normal at any point on the first total reflection surface 120 and the incident light satisfies the law of total reflection. The formation of the light emitting surface 130 can also refer to the formation setting of the first total reflection surface 120, except that the stretching direction of the curve is different.

Optionally, a primary reflective element may be provided in the present application, and the light source 220 may be located at or near the focus of the primary reflective element. In view of the effect of the first total reflection surface 120, the primary reflective element and the first total reflection surface 120 may be arranged in a non-front-to-back direction, thereby avoiding the problem of the lighting device 10 being too large in the front-to-back direction. The light emitted by the light source 220 may be modulated by the primary reflective element to obtain a better lighting effect. When the primary reflective element is provided, the primary reflective element may be provided integrally with the optical lens 100, thereby, on the one hand, the volume of the lighting device 10 may be effectively reduced, on the other hand, the integrally provided form may effectively save the dimming step of the primary reflective element in the light distribution process, and on the other hand, the integrally provided form may also allow the light to enter only once (enter the light-entering surface 110 of the optical lens 100) and exit once (exit the light-exiting surface 130 of the optical lens 100), thereby effectively reducing light loss and improving the performance of the lighting device 10. Of course, in other embodiments, the primary reflective element and the optical lens 100 may be separately provided, thereby reducing the difficulty in manufacturing the optical lens 100 and improving the yield rate of the optical lens 100. The integrated and separate forms will be described separately below in conjunction with the accompanying drawings.

When the primary reflective element is integrally provided with the optical lens 100, it can be understood that a primary reflective surface 150 is provided on the optical lens 100 to realize the primary modulation function. For example:

In one embodiment, as shown in Figures 3 and 4, the optical lens 100 has a primary reflection surface 150, and along the light path direction, the primary reflection surface 150 is located between the light incident surface 110 and the first total reflection surface 120, and the primary reflection surface 150 is arranged closer to the light emitting surface 130 relative to the light incident surface 110.

Correspondingly, the light source 220 is located on one side of the light incident surface 110 of the optical lens 100. As shown in Fig. 5, Fig. 6 and Fig. 7, the light source 220 is arranged on one side of the light incident surface 110 of the optical lens 100, and the light source 220 can be located at the focal position or near the focal position of the primary reflection surface 150. Therefore, as shown in Fig. 7, under the action of the first total reflection surface 120, the primary reflection surface 150 and the first total reflection surface 120 can also be arranged in the up-down direction, so as to avoid the lighting device 10 from being too large in the front-back direction.

In addition, a circuit board 210 carrying a light source 220 may be provided. In order to improve the heat dissipation of the light source 220, a heat sink 200 may be provided on a side of the circuit board 210 away from the light source 220, so that the light source 220 is effectively dissipated by the heat sink 200. The present application does not limit the type of the light source 220, the structure and material of the heat sink 200, etc. system.

As shown in FIG. 7 , the optical path of the light emitted by the light source 220 of the lighting device 10 in this embodiment when working is shown: the light emitted by the light source 220 is incident into the optical lens 100 through the light incident surface 110 of the optical lens 100, propagates to the primary reflection surface 150 and is reflected to the first total reflection surface 120, and then propagates to the light emitting surface 130 after total reflection and unidirectional collimation on the first total reflection surface 120, and then the light emitting surface 130 performs unidirectional collimation on the light in another direction and then emits it to form the light emitting light shape of the lighting device 10, thereby obtaining approximately parallel emitted light rays and obtaining a better lighting effect.

In another embodiment, as shown in FIGS. 8 , 9 and 10 , the optical lens 100 is also shown to have a primary reflection surface 150, and along the light path direction, the primary reflection surface 150 is located between the light incident surface 110 and the first total reflection surface 120. The difference from the previous embodiment is that the primary reflection surface 150 is arranged farther away from the light emitting surface 130 relative to the light incident surface 110. Thus, the light source 220, the circuit board 210 and the heat sink 200 can make full use of the space below the optical lens 100, thereby further reducing the volume of the lighting device 10.

As shown in Figure 10, the optical path of the light emitted by the light source 220 of the lighting device 10 in this embodiment when working is shown: the light emitted by the light source 220 is incident into the optical lens 100 through the light incident surface 110 of the optical lens 100, propagates to the primary reflection surface 150 and is reflected to the first total reflection surface 120, and then propagates to the light emitting surface 130 after total reflection and unidirectional collimation on the first total reflection surface 120, and then the light emitting surface 130 performs unidirectional collimation on the light of the light source 220 in another direction and then emits it to form the light output shape of the lighting device 10, thereby obtaining approximately parallel output light rays and obtaining a better lighting effect.

It can be seen from the embodiments shown in FIG. 7 and FIG. 10 that, during setting, the position of the primary reflective surface 150 can be flexibly selected according to the requirements of the lighting device 10, so that the lighting device 10 can have different structural forms to meet different layout requirements.

In another embodiment, as shown in Figures 11 and 12, it is also shown that the optical lens 100 has a primary reflection surface 150, and along the light path direction, the primary reflection surface 150 is located between the light incident surface 110 and the first total reflection surface 120. The difference from the previous embodiment is that a second total reflection surface 160 is added between the primary reflection surface 150 and the first total reflection surface 120. The light path of the light inside the optical lens 100 can be changed through the second total reflection surface 160, thereby conveniently changing the structural form of the optical lens 100.

As shown in FIG. 12 , the optical path of the light emitted by the light source 220 of the lighting device 10 in this embodiment when working is shown: the light emitted by the light source 220 is incident on the light incident surface 110 of the optical lens 100, propagates to the primary reflection surface 150 and is reflected to the second total reflection surface 160, and then is incident on the first total reflection surface 120 after being reflected by the second total reflection surface 160, and then propagates to the light emitting surface 130 after being totally reflected and unidirectionally collimated on the first total reflection surface 120, and then the light emitting surface 130 unidirectionally collimates the light in another direction and then emits it to form the light emitting light shape of the lighting device 10, thereby obtaining approximately parallel emitted light rays and obtaining a better lighting effect.

In another embodiment, as shown in FIGS. 13 and 14 , the optical lens 100 is also shown to have a primary reflection surface 150, and along the light path direction, the primary reflection surface 150 is located between the light incident surface 110 and the first total reflection surface 120, and a second total reflection surface 160 is added between the primary reflection surface 150 and the first total reflection surface 120. The difference from the previous embodiment is that a second total reflection surface 160 is added between the first total reflection surface 120 and the light exiting surface 130, and the light path inside the optical lens 100 can be changed by the two second total reflection surfaces 160, thereby conveniently changing the structural form of the optical lens 100, as shown in FIGS. 13 and 14 , so that the bottom surface c of the optical lens 100 is a plane, thereby reducing the difficulty of processing and manufacturing the optical lens 100 and improving the yield rate.

As shown in FIG. 14 , the optical path of the light emitted by the light source 220 of the lighting device 10 in this embodiment when working is shown: the light emitted by the light source 220 is incident into the optical lens 100 through the light incident surface 110 of the optical lens 100, propagates to the primary reflection surface 150 and is reflected to the second total reflection surface 160, and then is incident on the first total reflection surface 120 after being reflected at the second total reflection surface 160, and then propagates to another second total reflection surface 160 after being reflected and unidirectionally collimated at the first total reflection surface 120, and then propagates to the light emitting surface 130 after being reflected by the second total reflection surface 160, and then the light emitting surface 130 performs unidirectional collimation on the light in another direction and then emits it to form the light emitting light shape of the lighting device 10, thereby obtaining approximately parallel emitted light rays and obtaining a better lighting effect.

Optionally, as shown in Figures 3 to 14, the surface shape of the primary reflection surface 150 is a parabola, a quasi-parabola, an ellipsoid or a quasi-ellipsoid, so that the primary reflection surface 150 can perform primary modulation on the light of the light source 220, so that the light of the light source 220 reflected by the primary reflection surface 150 can be irradiated to the first total reflection surface 120 or the second total reflection surface 160 as nearly parallel light, thereby improving the lighting effect of the lighting device 10.

Optionally, as shown in FIGS. 3 to 14, in an embodiment where the optical lens 100 has a primary reflective surface 150, that is, the primary reflective element is integrally provided with the optical lens 100, the primary reflective surface 150 may be a total reflective surface or a reflective mirror surface with a reflective layer, thereby, the light can be modulated by the primary reflective surface 150 while avoiding light loss. The total reflective surface refers to the light emitted by the light source 220 being reflected by total reflection when incident on the total reflective surface; the reflective mirror surface with a reflective layer refers to a reflective layer coated on a designated area of the outer surface of the optical lens 100, thereby, the light emitted by the light source 220 is reflected by mirror reflection when incident on the reflective mirror surface with a reflective layer.

Optionally, as shown in FIGS. 3 to 14 , in an embodiment where the optical lens 100 has a primary reflective surface 150, that is, the primary reflective element is integrally provided with the optical lens 100, the optical lens 100 may be integrated with a cutoff line structure 140, that is, the cutoff line structure 140 is integrally provided with the optical lens 100. Specifically: as shown in FIGS. 3 to 14 , the cutoff line structure 140 is provided at or near the boundary of the primary reflective surface 150 on the side close to the light source 220. The cutoff line structure 140 can correspond to the light shape of the emitting light of the lighting device 10 having a cutoff line, thereby meeting the light shape standard. The cutoff line structure 140 may be located at the focus of the optical lens 100, as shown in FIGS. 3 and 4 , for example, which show parallel light entering the optical lens 100 from the light emitting surface 130 and converging at a point after being reflected by the first total reflection surface 120. This point is the focal point of the optical lens 100. The cut-off line structure 140 can be arranged near the focal position 141, so that when the light from the light source 220 irradiates the cut-off line structure 140, the image formed here can be emitted through the optical lens 100 and formed on the light distribution screen, that is, a light cut-off line of the light output light shape is formed. The vicinity of the boundary refers to the range of 2 mm around the boundary.

When the primary reflective element is disposed separately from the optical lens 100, it can be understood that a primary reflector is separately disposed outside the optical lens 100 to reflect the light emitted by the light source 220 to the light incident surface 110 of the optical lens 100 and realize the primary modulation function. For example:

As shown in Figure 15, a primary reflector is arranged between the light source 220 and the optical lens 100. Under the action of the first total reflection surface 120, the light incident surface 110 of the optical lens 100 can be located at the bottom surface, and the primary reflector is arranged below the optical lens 100, thereby forming an arrangement in the up and down directions with the first total reflection surface 120, thereby avoiding the lighting device 10 from being too large in the front and back directions.

Similarly, in this embodiment, a circuit board 210 carrying a light source 220 may also be provided. In order to improve the heat dissipation of the light source 220, a heat sink 200 may also be provided on a side of the circuit board 210 away from the light source 220, so that the heat sink 200 can effectively dissipate the heat of the light source 220. The present application does not limit the type of the light source 220, the structure and material of the heat sink 200, etc.

In this embodiment, when the lighting device 10 is working, the optical path of the light emitted by the light source 220 is as follows (not shown in the figure): the light source 220 emits light and is incident on the primary reflector. Under the reflection action of the primary reflector, the light is incident on the light incident surface 110 of the optical lens 100, propagates to the first total reflection surface 120, and is totally reflected and unidirectionally collimated on the first total reflection surface 120. The light is propagated to the light emitting surface 130, and then the light emitting surface 130 unidirectionally collimates the light in another direction and then emits it to form the light output shape of the lighting device 10. As a result, approximately parallel output light rays are obtained, thereby achieving a better lighting effect.

Of course, in this embodiment, at least one second total reflection surface 160 may be added inside the optical lens 100, thereby changing the light path inside the optical lens 100, so that the optical lens 100 has a specific external shape to meet the layout requirements of other components.

Optionally, as shown in Figure 15, the surface shape of the primary reflecting surface 150 of the primary reflector is a parabola, a quasi-parabola, an ellipsoid or a quasi-ellipsoid. The quasi-parabola refers to a curved surface similar to a parabola, and the quasi-ellipsoid refers to a curved surface similar to an ellipsoid, which have similar optical properties. Thus, the light of the light source 220 can be primarily modulated by the primary reflecting surface 150, so that the light of the light source 220 after being reflected by the primary reflecting surface 150 can be irradiated to the first total reflection surface 120 or the second total reflection surface 160 as nearly parallel light, thereby improving the lighting effect of the lighting device 10.

Optionally, as shown in FIG15, in an embodiment in which the primary reflective element and the optical lens 100 are separately provided, the primary reflector may be integrated with a cutoff line structure 140, that is, the cutoff line structure 140 and the primary reflector are provided as one body. Specifically, as shown in FIG15, the cutoff line structure 140 is provided at or near the boundary of the primary reflective surface 150 of the primary reflector close to the light source 220. The cutoff line structure 140 may correspond to the light output shape of the lighting device 10. There is a cutoff line, so as to meet the standard of light shape. The cutoff line structure 140 can be located at the focus of the optical lens 100, for example, as shown in Figures 1 and 2, it is shown that parallel light enters the optical lens 100 from the light exit surface 130, and converges at a point outside the optical lens 100 after being reflected by the first total reflection surface 120. This point is the focus position 141 of the optical lens 100, and the cutoff line structure 140 can be set at or near this point. Therefore, when the light from the light source 220 irradiates the cutoff line structure 140, the image formed here can be emitted through the optical lens 100 and formed on the light distribution screen, that is, the light and dark cutoff line of the light exit light shape is formed.

Of course, as shown in FIG. 1 and FIG. 2, in other embodiments, the cut-off line structure 140 may not be integrally arranged with the optical lens 100 or the primary reflector, and may be formed by a separate light blocking member or a light shielding plate or a condenser, which is not limited in the present application. When setting, it is necessary to make the cut-off line structure 140 located at or near the focus 141 of the optical lens 100 as shown in FIG. 1 or FIG. 2. Wherein, near the focus refers to within 2 mm around the focus.

It should be understood that the lighting device 10 in the present application may include a low beam module 12 for forming a low beam light shape, and the lighting device 10 shown in Figures 5 to 15 can be used to form a low beam light shape. Of course, the lighting device 10 in the present application may also include a high beam module 11 for forming a high beam light shape, and the lighting device 10 shown in Figures 5 to 15 can be used to form a high beam light shape. Alternatively, the lighting device 10 in the present application simultaneously includes a low beam module 12 for forming a low beam light shape and a high beam module 11 for forming a high beam light shape, for example, as shown in Figure 16, with the dotted line in Figure 16 as the dividing line (the dividing line is a virtual line, only for ease of understanding, and does not exist in the actual structure), the structure above the dividing line can be used as the high beam module 11 for forming a high beam light shape, and the structure below the dividing line can be used as the low beam module 12 for forming a low beam light shape. Of course, in different embodiments, the low beam module 12 and the high beam module 11 can be separately arranged or integrally arranged. For example, as shown in Figure 16, the low beam module 12 and the optical lens 100 in the high beam module 11 are integrally arranged, and the optical surfaces of the optical lenses 100 of the low beam module 12 and the high beam module 11 are symmetrically arranged. The first total reflection surface 120 of the low beam module 12 is connected to the first total reflection surface 120 of the high beam module 11, and the light emitting surface 130 of the low beam module 12 is connected to the light emitting surface 130 of the high beam module 11. Of course, in one embodiment, the low beam module 12 and the high beam module 11 can share a light emitting surface 130, thereby further improving the integration of the lighting device 10, simplifying the light distribution, and reducing the volume of the lighting device 10.

As shown in FIG. 17 , this is the low beam light shape formed on the light distribution screen when the lighting device 10 in the present application is used as the low beam module 12 . The cut-off line structure 140 is used to make the low beam light shape have a bright and dark cut-off line, thereby meeting the low beam lighting requirements.

Another aspect of the present application is to provide a vehicle lamp, comprising any one of the above-mentioned lighting devices 10. By improving the optical lens 100 in the lighting device 10, the optical lens 100 has a first total reflection surface 120, thereby changing the position of the light incident surface 110 of the optical lens 100 through the first total reflection surface 120, thereby preventing the lighting device 10 from being too large in the front-to-back direction, effectively preventing the vehicle lamp from being too large in the front-to-back direction, and reducing The restrictions on the lamp when it is installed on the vehicle.

The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Industrial Applicability

Claims

A lighting device, characterized in that it comprises a light source and an optical lens arranged on the light emitting side of the light source, the optical lens having a light incident surface, a first total reflection surface capable of collimating light along a first direction, and a light emitting surface capable of collimating light along a second direction, which are arranged in sequence along the light path, the first direction and the second direction are perpendicular or approximately perpendicular to each other, and the light emitted by the light source incident through the light incident surface is reflected by the first total reflection surface to the light emitting surface and collimated to emit.
The lighting device according to claim 1 is characterized in that a section line of the first total reflection surface in the first direction is a curve, and a section line of the first total reflection surface in the second direction is a straight line or an approximate straight line.
The lighting device according to claim 2 is characterized in that the surface shape of the first total reflection surface is a cylinder or a quasi-cylindrical surface.
The lighting device as described in claim 1 is characterized in that the optical lens also has a primary reflection surface located between the light incident surface and the first total reflection surface along the light path direction, and the light emitted by the light source incident through the light incident surface is reflected by the primary reflection surface to the first total reflection surface.
The lighting device according to claim 4, characterized in that the primary reflection surface is a total reflection surface or a reflection mirror surface with a reflective layer.
The lighting device as described in claim 1 is characterized in that the lighting device also includes a primary reflector having a primary reflective surface, the primary reflector is located between the light source and the optical lens, and the primary reflector is used to reflect the light emitted by the light source to the light incident surface of the optical lens.
The lighting device according to any one of claims 1 to 6 is characterized in that the lighting device further comprises a cutoff line structure located on the light emitting side of the light source, the cutoff line structure is located at or near the focus of the optical lens, and the cutoff line structure is used to form a light emitting light shape with a cutoff line.
The lighting device according to claim 7, characterized in that, when the lighting device further includes a primary reflective surface, the cut-off line structure is arranged at or near a boundary of the primary reflective surface on a side close to the light source.
The lighting device according to any one of claims 1 to 6 is characterized in that the optical lens also has at least one second total reflection surface located on the optical path, and the at least one second total reflection surface is used to adjust the optical path of the light emitted by the light source in the optical lens.
The lighting device according to any one of claims 4 to 6 is characterized in that the surface shape of the primary reflecting surface is a parabola, a quasi-parabola, an ellipsoid or a quasi-ellipsoid.
A vehicle lamp, characterized by comprising the lighting device according to any one of claims 1 to 10.