WO2024093061A1

WO2024093061A1 - Reflective optical module, lighting device using same, and vehicle

Info

Publication number: WO2024093061A1
Application number: PCT/CN2023/078413
Authority: WO
Inventors: 徐岩修; 何箐
Original assignee: 常州星宇车灯股份有限公司
Priority date: 2022-10-31
Filing date: 2023-02-27
Publication date: 2024-05-10
Also published as: CN115638383A

Abstract

A reflective optical module, a lighting device using same, and a vehicle. The reflective optical module comprises a light source (1), and at least one first mirror (3), an optical lens (2) and at least one second mirror (4), which are sequentially arranged in the direction of an optical path, wherein the first mirror (3) is arranged to be capable of reflecting light emitted by the light source (1) and making same enter the optical lens (2); the second mirror (4) has a linear focus or an arc focus in a horizontal direction; the optical lens (2) has a linear focus or an arc focus in a vertical direction; the focal length of the second mirror (4) is greater than that of the optical lens (2); and a light-incident surface of the optical lens (2) is a flat end surface or a curved surface, and the optical lens (2) comprises at least one light-emergent surface, which is formed by sweeping a section line of same in the horizontal direction along a section line in the vertical plane, or by stretching, in the vertical direction, the section line of same in the horizontal direction.

Description

Reflective optical module, lighting device and vehicle using the same

Technical Field

The present invention relates to the technical field of lighting devices, and in particular to a reflective optical module and a lighting device and a vehicle using the same.

Background technique

As the development of the automobile industry gradually matures and stabilizes, the shape of car lights is becoming more and more diverse. The high and low beam modules are no longer the traditional semi-spherical type, and the appearance is becoming more and more slender. Flattening has become one of the main trends in the design of automobile lights. For flattened automobile lights, the corresponding lighting characteristics are small up and down lighting angles and large left and right lighting angles. Specifically, the size of the light-emitting surface of the lens is limited, and the size of the lens in the up and down direction is less than or equal to 20mm, and the size in the left and right direction is 40mm to 120mm. However, since the light-emitting surface size of the lens of the prior art is relatively large, if the lens is directly reduced or combined with the reduction of optical elements, it cannot meet the requirements of light shape, optical performance and optical efficiency.

In this regard, the patent with announcement number CN 215372307 U discloses a lighting module, a lighting device and a vehicle, which can independently adjust the surface shape of the two optical surfaces of the light-incoming surface and the light-outgoing part, simplify the dimming steps in the light distribution process, and effectively reduce the upper and lower dimensions of the optical lens while ensuring the same light effect. However, it uses a dual-focal length lens. For the light-outgoing part or the outer lens of the lens, there can only be one focal length, and the deflection angle of the lens and the optical axis direction has a greater impact on the optical design, so the corresponding design difficulty is also great. In addition, the near-bright and dark cutoff lines in the lighting device are formed by refraction of a component with a cutoff line shape in conjunction with a lens, so the number of components used is large, and the overall structure is relatively complex. In addition, the cutoff line obtained by lens imaging, because the light-outgoing surface of the lens has a certain curvature, then the light will definitely have a prism effect after passing through the lens, and different degrees of color segregation will occur, which means that the color of the dark cutoff line is still prone to coloring. Therefore, for the lighting device used in the prior art, it is necessary to optimize the imaging effect of the light cutoff line on the basis of achieving flattening of the light pattern.

Summary of the invention

The first object of the present invention is to provide a reflective optical module to solve the technical problem of taking into account both the flattening of the light pattern and the imaging effect of the bright and dark cut-off lines.

A second object of the present invention is to provide an illumination device to solve the technical problem of achieving both flattened light pattern and imaging effect of the light and dark cutoff line.

The third object of the present invention is to provide a vehicle to solve the technical problem of making the lighting device on the vehicle take into account both the flattening of the light pattern and the imaging effect of the bright and dark cut-off line.

The reflective optical module of the present invention is implemented as follows:

A reflective optical module comprises: a light source and at least one first reflector, an optical lens and at least one second reflector arranged in sequence along the light path direction; wherein

The first reflector is arranged to reflect the light emitted by the light source and allow it to enter the optical lens;

The second reflector has a linear focus or an arc focus along the horizontal direction; the optical lens has a linear focus or an arc focus along the vertical direction; and the focal length of the second reflector is greater than the focal length of the optical lens;

The light incident surface of the optical lens is a flat end surface or a curved surface; and the optical lens includes at least one light emitting surface; the light emitting surface is formed by sweeping the section line in the horizontal direction along the section line in the vertical plane or by stretching the section line in the horizontal direction along the vertical direction.

In an optional embodiment of the present invention, the focal line of the second reflector and the focal line of the optical lens together constitute a focal area of the reflective optical module.

In an optional embodiment of the present invention, the first reflector is a free-form reflector or a parabolic reflector. Line reflectors; and

The focal length of the first reflector is less than or equal to 3 mm.

In an optional embodiment of the present invention, a cross-section of the optical lens in the horizontal direction is a plano-convex curve or a convex-planar curve; and

The section line of the optical lens in the vertical direction is a plano-convex curve or a plano-concave curve.

In an optional embodiment of the present invention, the optical lens includes at least two light emitting surfaces; and

The arc focal points of at least two of the light emitting surfaces are the same or different.

In an optional embodiment of the present invention, the second reflector is formed by stretching a parabola with a focus in a focal area of the reflective optical module in a horizontal direction.

In an optional embodiment of the present invention, the reflective surface of the second reflector is suitable for forming a side wall of a bathtub-shaped cut-off line; and

The optical lens is suitable for forming a bottom wall of the cut-off line extending in a horizontal direction.

In an optional embodiment of the present invention, the light source, at least one first reflector, the optical lens and at least one second reflector are arranged and distributed along a direction perpendicular to the optical axis.

In an optional embodiment of the present invention, the light source, at least one first reflector, the optical lens and at least one second reflector are arranged to rotate around a direction perpendicular to the optical axis; and

A plane reflector is also provided between the optical lens and at least one second reflector.

The lighting device of the present invention is implemented as follows:

A lighting device comprises: the reflective optical module.

The vehicle of the present invention is achieved in this way:

A vehicle comprises: the lighting device.

By adopting the above technical solution, the present invention has the following beneficial effects: the reflective optical module of the present invention and the lighting device and vehicle using the same, the second reflector has a straight line along the horizontal direction The optical lens has a linear focus or an arc focus along the vertical direction; and the focal length of the second reflector is greater than the focal length of the optical lens. Under such a structure, on the one hand, since the focal length of the second reflector is greater than the focal length of the optical lens, the light source can form a rectangular lighting light pattern through the second reflector, and no additional reflective optical module is required to be specially designed, making the structure of the headlight lighting system simple, for example, allowing the size of the reflective optical module in the vertical direction to be less than or equal to 15mm, thereby meeting the needs of flat headlights.

In addition, the reflective surface of the second reflector is suitable for forming the side wall of the cut-off line of the bathtub shape, and its color is close to white without the phenomenon of coloring.

Furthermore, the present invention can achieve different focal lengths along the horizontal direction through the cooperation of multiple second reflectors, thereby achieving different vertical widths. And the different spatial arrangement structures of the multiple second reflectors are more beneficial to the conformal shape of the overall reflective optical module.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic structural diagram of a reflective optical module of the present invention;

2 is a schematic diagram of a light source, a first reflector, an optical lens, and a second reflector of a reflective optical module of the present invention arranged in a direction perpendicular to the optical axis;

3 is a schematic diagram of a light source, a first reflector, an optical lens, and a second reflector of a reflective optical module of the present invention, which are arranged and distributed in a rotational manner around a direction perpendicular to the optical axis;

FIG4 is a schematic diagram of a parabola c and a second reflector of a reflective optical module of the present invention;

FIG5 is a schematic diagram of a vertically unidirectionally aligned lens 2′ and a conventional plano-convex lens 2″;

Fig. 6 is a schematic diagram of a section a of the lens 2' in the horizontal direction;

FIG7 is a schematic diagram of a section line b of the lens 2″ in the vertical direction;

FIG. 8 is an optical effect diagram of the reflective optical module of the present invention.

In the figure: light source 1, first reflector 3, optical lens 2, light incident surface 21, light exit surface 22, vertical A straight single-direction aligned lens 2', a conventional plano-convex lens 2", a section a of the lens 2' in the horizontal direction, a section b of the lens 2" in the vertical direction, a parabola c, a second reflector 4, and a plane reflector 5.

Detailed ways

In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

Embodiment 1:

Please refer to Figures 1 to 8, this embodiment provides a reflective optical module, including: a light source 1 and at least one first reflector 3, an optical lens 2 and at least one second reflector 4 arranged in sequence along the light path direction; wherein the first reflector 3 is arranged to reflect the light emitted by the light source 1 and make it enter the optical lens 2; the second reflector 4 has a focus in the horizontal direction; the optical lens 2 has a linear focus or an arc focus in the vertical direction; the focal line of the second reflector 4 and the focal line of the optical lens 2 together constitute the focal area of the reflective optical module.

It should be noted here that the “horizontal direction” and “vertical direction” for positioning in this embodiment are defined in combination with the specific orientation of the reflective optical module during use.

In this embodiment, different focal lengths along the horizontal direction can be achieved by cooperating with multiple second reflectors 4, thereby achieving different vertical widths. In addition, the different spatial arrangement structures of the multiple second reflectors 4 are more beneficial to the conformal shape of the overall reflective optical module.

The focus of the second reflector 4 of this embodiment can be a linear focus, which is formed as follows: the second reflector 4 is formed by stretching a parabola whose focus is located in the focal area of the reflective optical module in the horizontal direction. The linear focus is a straight line located in the focal area of the reflective optical module.

The focus of the second reflector 4 of the present embodiment can be an arc focus, which is formed as follows: the second reflector 4 is formed by sweeping a parabola whose focus is located in the focal area of the reflective optical module along a curve in the horizontal plane, and the arc focus is a line located in the focal area of the reflective optical module and parallel to the swept curve.

In a preferred case, the focal length of the first reflector 3 is less than or equal to 3 mm, so that in order to achieve the same illumination value, the focal length of the entire reflective optical module can be larger, but at the same time the distance of the reflective optical module in the optical axis direction can be shortened by at least 30% compared with the traditional solution.

In an optional implementation, the focal length of the second reflector 4 is 3 to 5 times the focal length of the optical lens 2, which can produce a light pattern that is wide left and right and narrow up and down. The light pattern imaged onto the road surface can be wider, and the light source 1 can form a rectangular lighting light pattern through the second reflector 4. No additional reflective optical module is required, which makes the structure of the vehicle lighting system simple. For example, the size of the reflective optical module in the up and down direction is allowed to be less than or equal to 15 mm, thereby meeting the needs of flat-shaped vehicle lights.

The light incident surface 21 of the optical lens 2 is a flat end surface or a curved surface; and the optical lens 2 includes at least one light emitting surface 22; the light emitting surface 22 is formed by sweeping its horizontal section along the section in the vertical plane or by stretching its horizontal section along the vertical direction. When each light emitting surface 22 is formed by sweeping, the lower boundary transition of the imaged light pattern is smoother.

The arc focus of each light-emitting surface 22 of the optical lens 2 of the present embodiment is formed as follows: a traditional plano-convex lens or a lens 2’ with horizontal unidirectional collimation, the focus of lens 2’ is set at the focus of the reflective optical module; another traditional plano-convex lens 2’’ also sets the focus at the focus of the reflective optical module; lens 2’ and lens 2’’ are placed in similar positions. Lens 2’ has a horizontal section a, lens 2’’ has a vertical section b, and the arc focus of the inner lens 2 in the reflective optical module is a curve parallel to section b and located at the focus of the reflective optical module. That is, the light-emitting surface 22 of the inner lens 2 is formed by sweeping along section b through section a, and the light-emitting surface 22 and the light-incident surface 21 together form the optical lens 2.

The first reflector 3 is a free-form reflector or a parabolic reflector; and the focal length of the first reflector 3 is less than or equal to 3 mm. The curved surface reflector, the so-called free-form surface, refers to a surface shape that can be any spatial curved surface. The light distribution and reflection are integrated, so that the angle of the light reflected by the light source 1 after passing through the first reflector 3 can be larger, thereby making the light type after imaging wider; and the free-form surface reflector is composed of free-form surfaces with multiple curvatures. By using the free-form surface reflector as the first reflector 3, the direction of the reflected light changes continuously with the shape of the surface of the free-form surface reflector, so that the light can be projected to a specified area. The use of the free-form surface reflector not only simplifies the manufacturing process, but also allows more light to enter the lens, thereby improving the efficiency of the overall reflective optical module.

The cross section of the optical lens 2 in the horizontal direction is a plano-convex curve or a convex-planar curve; and the cross section of the optical lens 2 in the vertical direction is a plano-convex curve or a plano-concave curve. The optical lens 2 includes at least two light-emitting surfaces 22; and the arc focal points of at least two light-emitting surfaces 22 are the same or different. That is, there can be only two light-emitting surfaces 22, or there can be more than two light-emitting surfaces 22, and the above situations all meet the use requirements of this embodiment. The drawings of this embodiment are only examples of the case of multiple light-emitting surfaces 22.

With reference to the examples in the attached drawings for optional situations, the cross-section of the light emitting surface 22 in the horizontal direction is a convex curve (the convex curve here specifically refers to the bulge toward the second reflector 4), and the cross-section of the light emitting surface 22 in the vertical direction is also a curve, which can be a convex curve or a concave curve (the convex curve here specifically refers to the bulge toward the second reflector 4, and the concave curve refers to the surface facing the second reflector 4 being concave), and this embodiment does not make an absolute limitation on this. In this regard, it should be noted that when the light incident portion includes more than two light emitting surfaces 22, that is, multiple light emitting surfaces 22, there are the following four situations: the first is that the sections of the multiple light emitting surfaces 22 in the vertical direction are all convex curves, which have a convergence effect, have a large degree of deflection of light, and can have a certain collimation effect on divergent light; and the convex rates of the convex curves corresponding to the sections of the multiple light emitting surfaces 22 in the vertical direction are all the same; the second is that the sections of the multiple light emitting surfaces 22 in the vertical direction are all convex curves, which have a convergence effect, have a large degree of deflection of light, and can have a certain collimation effect on divergent light, but the multiple light emitting surfaces 22 The convex curves corresponding to the sections of the light surface 22 in the vertical direction have different convexity rates; the third type, the sections of multiple light-emitting surfaces 22 in the vertical direction are all concave curves, and the concave curves corresponding to the sections of multiple light-emitting surfaces 22 in the vertical direction have the same depression rates; the fourth type, the sections of multiple light-emitting surfaces 22 in the vertical direction are all concave curves, and the depression rates of the concave curves corresponding to the sections of multiple light-emitting surfaces 22 in the vertical direction are different. The above situations all meet the use requirements of this embodiment, and this embodiment does not make an absolute limitation on which specific situation is adopted. The attached figure of this embodiment only takes the case where the horizontal section and the vertical section of the light-emitting surface 22 of the optical lens 2 are both plano-convex curves along the optical axis direction as an example, and the plano-convex curve here is specifically convex to the direction of vehicle travel.

Furthermore, regarding the relationship between the first reflector 3 and the light emitting surface 22, in an optional implementation, the first reflector 3 and the light emitting surface 22 are distributed in a one-to-one correspondence; in another optional implementation, at least one light emitting surface 22 corresponds to more than one first reflector 3. In this case, that is, for multiple light emitting surfaces 22, each light emitting surface 22 may correspond to more than one, for example but not limited to two, first reflectors 3, or only individual light emitting surfaces 22 among the multiple light emitting surfaces 22 may correspond to more than one, for example but not limited to two, first reflectors 3. The above situations all meet the use requirements of this embodiment, and this embodiment does not make an absolute limitation on this.

The light source 1 is arranged in a one-to-one correspondence with the first reflector 3 , and the light source 1 is arranged in the focal area of the corresponding first reflector 3 , and the focal area is the area near the focus including the focus. Specifically, the light emission center of the light source 1 can be arranged on the focus of the first reflector 3 .

It should be noted that the second reflector 4 in this embodiment is formed by stretching a parabola c whose focus is in the focal area of the reflective optical module in the horizontal direction. The reflective surface of the second reflector 4 is suitable for forming the side wall of the light-dark cutoff line in the shape of a bathtub, and its color is close to white without the phenomenon of coloring; and the optical lens 2 is suitable for forming the bottom wall of the light-dark cutoff line extending in the horizontal direction.

In an optional implementation, the light source 1, at least one first reflector 3, and the optical lens 2 and at least one second reflector 4 are arranged and distributed in a direction perpendicular to the optical axis. The overall size of the reflective optical module under this arrangement is at least 40% smaller than the size of the optical module formed by arranging optical elements along the optical axis. Therefore, based on this structure, the space occupied by the overall reflective optical module along the optical axis in the vehicle lamp environment can be reduced. In addition, since the light reflected by the second reflector 4 has a small deflection angle in the up and down direction, it is very suitable for flat vehicle lamp shapes. The up and down dimensions can be designed to be ≤15mm, and a high optical efficiency can be guaranteed.

In another optional implementation, the light source 1, at least one first reflector 3, the optical lens 2 and at least one second reflector 4 are arranged to rotate around a direction perpendicular to the optical axis. The specific rotation angle is not absolutely limited in this embodiment and can be adaptively adjusted according to actual needs. To this end, this embodiment requires a plane reflector 5 to be provided between the optical lens 2 and the at least one second reflector 4 to change the direction of the light refracted by the optical lens 2.

In summary, for the reflective optical module of this embodiment, the light from the light source 1 passing through the first reflector 3 can enter the optical lens 2 as much as possible, and the deflection angle of the light reflected by the first reflector 3 is relatively large at a horizontal angle, which can make the final imaged light pattern wider in the left-right direction. After the light from the optical lens 2 is reflected by the second reflector 4, the mutual deflection angle in the up-down direction is smaller than the horizontal direction, so that the reflective optical module of this embodiment can image a light pattern that is wide in the left-right direction and narrow in the up-down direction.

Embodiment 2:

Based on the reflective optical module of Example 1, this embodiment provides a lighting device, such as a vehicle lamp, comprising: the reflective optical module of Example 1. The lighting device of the present invention has the reflective optical module of the present invention, and for a corresponding lighting device design, the lighting device can have a flat and wide shape, for example, the headlight of a vehicle can have a flat shape.

Embodiment 3:

Based on the lighting device of embodiment 2, this embodiment provides a vehicle, including The lighting device of Example 2.

The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

In the description of the present invention, it is necessary to understand that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 invention.

In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

In addition, the terms "horizontal", "vertical", "overhanging", etc. do not imply that the parts must be absolutely "Horizontal" only means that its direction is more horizontal than "vertical", which does not mean that the structure must be completely horizontal, but can be slightly tilted.

In the present invention, unless otherwise clearly specified and limited, a first feature being above or below a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being above, above, and above a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being below, below, and below a second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

Claims

A reflective optical module, characterized in that it comprises: a light source and at least one first reflector, an optical lens and at least one second reflector arranged in sequence along the light path direction; wherein

The first reflector is arranged to reflect the light emitted by the light source and allow it to enter the optical lens;

The second reflector has a linear focus or an arc focus along the horizontal direction; the optical lens has a linear focus or an arc focus along the vertical direction; and the focal length of the second reflector is greater than the focal length of the optical lens;

The light incident surface of the optical lens is a flat end surface or a curved surface; and the optical lens includes at least one light emitting surface; the light emitting surface is formed by sweeping its horizontal section along a section in a vertical plane or by stretching its horizontal section along a vertical direction.
The reflective optical module according to claim 1 is characterized in that the focal line of the second reflector and the focal line of the optical lens together constitute a focal area of the reflective optical module.
The reflective optical module according to claim 1 or 2, characterized in that the first reflector is a free-form reflector or a parabolic reflector; and

The focal length of the first reflector is less than or equal to 3 mm.
The reflective optical module according to claim 1, wherein a cross-section of the optical lens in a horizontal direction is a plano-convex curve or a convex-planar curve; and

The section line of the optical lens in the vertical direction is a plano-convex curve or a plano-concave curve.
The reflective optical module according to claim 1, wherein the optical lens comprises at least two light emitting surfaces; and

The arc focal points of at least two of the light emitting surfaces are the same or different.
The reflective optical module according to claim 2, wherein the second reflective The reflective mirror is formed by stretching a parabola whose focus is in the focal area of the reflective optical module in the horizontal direction.
The reflective optical module according to claim 1, wherein the reflective surface of the second reflector is suitable for forming a side wall of a bathtub-shaped light-dark cutoff line; and

The optical lens is suitable for forming a bottom wall of the cut-off line extending in a horizontal direction.
The reflective optical module according to claim 1 is characterized in that the light source, at least one first reflector, the optical lens and at least one second reflector are arranged and distributed along a direction perpendicular to the optical axis.
The reflective optical module according to claim 1, wherein the light source, at least one first reflector, the optical lens and at least one second reflector are arranged to rotate around a direction perpendicular to the optical axis; and

A plane reflector is also provided between the optical lens and at least one second reflector.
A lighting device, characterized by comprising: the reflective optical module according to any one of claims 1 to 9.
A vehicle, characterized by comprising: the lighting device as claimed in claim 10.