WO2024016499A1

WO2024016499A1 - Dynamic projection module applied to vehicle lamp and design method therefor

Info

Publication number: WO2024016499A1
Application number: PCT/CN2022/126191
Authority: WO
Inventors: 徐悦佳; 吴宏胜; 程哲; 郑贤良
Original assignee: 常州星宇车灯股份有限公司
Priority date: 2022-07-22
Filing date: 2022-10-19
Publication date: 2024-01-25
Also published as: CN115079499A

Abstract

A dynamic projection module applied to a vehicle lamp and a design method. The dynamic projection module comprises: a plurality of light sources (1), the light sources (1) being used for emitting a light array; at least one lens (2), the lens (2) comprising an incident surface (21) and an emergent surface (22), and the light sources (1) being located on the side of the lens (2) close to the incident surface (21); a projection surface (3), the projection surface (3) being located on the side of the lens (2) close to the emergent surface (22), and the light array emitted by each light source (1) entering the lens (2) from the incident surface (21) and then being emitted from the emergent surface (22) to the projection surface (3), so that a projection pattern (4) can be formed on the projection surface (3); and a controller (5), the controller (5) being connected to the light sources (1), and the controller (5) being able to control the lighting and extinguishing of the light sources (1), so as to achieve dynamic change of the projection pattern (4). The projection pattern can be presented on the projection surface (3) by means of the lens (2) and the light sources (1), and the lighting and extinguishing of the light sources (1) can be controlled by means of the controller (5). The structure is simple, the number of parts used is obviously reduced, the complexity of the projection module can be reduced, and the costs can be reduced.

Description

Dynamic projection module applied to car lights and its design method

Technical field

The present invention relates to the technical field of automobile lamps, and in particular to a dynamic projection module applied to automobile lamps and a design method thereof.

Background technique

At present, common optical imaging projection modules usually consist of a light source, a condenser lens, a film, and a projection lens set. The film is usually a flat plate made of glass or plastic substrate, and a partially transparent or reflective projection pattern is printed on the flat plate. Projection lens sets usually contain 2 to 5 (or even more) lenses. The light emitted by the light source is collected by the condenser lens, passes through the film, enters the projection lens group, and is then projected onto the projection surface.

The basic principle of the above-mentioned optical imaging projection is to use the projection lens group to achieve object image conjugation. All the light rays emitted from any point on the film plane and entering the projection lens group are gathered by the projection lens group at the conjugate point of the projection surface; due to the film It forms a strict object-image relationship with the projection surface, resulting in a film that can only produce one projection pattern. Optical imaging projection modules generally use uniform illumination on the plane of the film, and use the film to block light to create a difference in light and dark, thereby forming a pattern. In this solution, the light energy in the dark area of the pattern is blocked by the film and cannot be projected onto the projection surface. , will cause a waste of light energy.

Based on the above optical imaging projection module, dynamic projection can be divided into the following two solutions:

(1) Adopt a dynamic film solution, using a digital micro-mirror device (DMD), liquid crystal device or micro LED light source array to replace the film, and control the DMD, liquid crystal device or micro LED light source array to load dynamics through electrical signals Pattern, although this solution can achieve arbitrary changes in the projection pattern, the optical path and control are complex and the cost is high.

(2) Use the solution of multiplexing projection modules to customize multiple films according to the target projection pattern. Each film corresponds to a projection pattern or a part of the projection pattern. Each film needs to be equipped with a complete light source and projection light path. By switching the switch and light intensity of each light source, dynamic switching of the projection pattern is achieved. Each set of projection modules in this solution needs to be equipped with a complete set of light sources and optical components, doubling the number of parts and costs.

Contents of the invention

The technical problem to be solved by the present invention is: in order to solve the technical problems of high complexity and high cost of dynamic projection solutions in the prior art, the present invention provides a dynamic projection module applied to car lights and a design method thereof. and light source can realize the projection of the projection pattern, which can reduce the number of parts, reduce the complexity of the module, and reduce the cost.

The technical solution adopted by the present invention to solve the technical problem is: a dynamic projection module applied to car lights, including:

Multiple light sources, the light sources are used to emit light arrays;

At least one lens, the lens includes an incident surface and an exit surface, and the light source is located on a side of the lens close to the incident surface;

Projection surface. The projection surface is located on the side of the lens close to the exit surface. The light array emitted by each light source enters the lens from the entrance surface and then exits from the exit surface to the projection surface. on, a projection pattern can be formed on the projection surface;

A controller, the controller is connected to the light source, and the controller can control the lighting and extinguishing of the light source to realize dynamic changes of the projection pattern.

The present invention can realize the projection pattern on the projection surface through the lens and the light source, and can control the lighting and extinguishing of the light source through the controller. The structure of the present invention is simple, and the number of parts used is significantly reduced, which can not only reduce the complexity of the projection module degree and can also save costs.

Further, the number of the light sources is equal to the number of the lenses, and the light sources correspond to the lenses one-to-one.

Further, the plurality of light sources correspond to the same lens.

Furthermore, the incident surface of the lens is a spherical surface, the exit surface is a free-curved surface, and the concave directions of the incident surface and the exit surface are the same.

Further, there is a mapping relationship between the exit surface and the projection pattern.

Further, the incident point of the light ray on the incident surface is P ₁ , the corresponding point of the incident point P ₁ on the exit surface is P ₂ , and the corresponding point of the corresponding point P ₂ on the projection surface is P ₃ , there is a mapping relationship between the corresponding points P ₂ and P ₃ .

Further, assuming that the position of the light source is P ₀ , the refractive index of the lens is n, and the light

light

And the refractive index n satisfies the law of refraction, the light

light

And the refractive index n satisfies the law of refraction.

Further, the shape of the projection pattern is determined by the mapping relationship between the exit surface and the projection pattern.

The present invention also provides a design method for a dynamic projection module applied to a car lamp, including the above-mentioned dynamic projection module applied to a car lamp. The design method includes the following steps:

S1. Establish a preliminary model of the lens;

S2. Establish the mapping relationship between the exit surface and the projection pattern, and solve for the surface shape of the exit surface;

S3. Place the light source on one side of the lens, and place the projection surface on the other side of the lens, so that the light emitted by the light source can form a predetermined projection pattern on the projection surface after passing through the lens;

S4. Connect the controller to multiple light sources, and use the controller to control the lighting and extinguishing of the light sources to achieve dynamic changes in the projection pattern.

The beneficial effect of the present invention is that the dynamic projection module and its design method applied to car lights of the present invention adopt an optical scheme of non-imaging projection, and can realize projection on the projection surface by using a lens and a light source. The design of the surface shape can form a predetermined projection pattern; by lighting different light sources, the dynamic change of the projection pattern can be achieved. The invention has a simple structure, reduces the number of parts and components, reduces the complexity of the optical system, can effectively reduce costs and create significant economic benefits.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and examples.

Figure 1 is a structural block diagram of a dynamic projection module applied to car lights according to the present invention.

Figure 2 is a schematic structural diagram of Embodiment 1 of the present invention.

Figure 3 is a schematic diagram of incident light rays and outgoing light rays of the present invention.

Figure 4 is a schematic structural diagram of Embodiment 2 of the present invention.

FIG. 5 is a flow chart of the design method of the dynamic projection module applied to vehicle lights according to the present invention.

Figure 6 is a schematic diagram of the intersection point of the light array of the present invention and the incident surface, exit surface and projection surface.

Figure 7 is a schematic diagram of a partial section of the exit surface of the present invention.

In the picture: 1. Light source; 2. Lens; 3. Projection surface; 4. Projection pattern; 5. Controller; 21. Incident surface; 22. Exit surface.

Detailed ways

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the structures related to the present invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", " "Back", "Left", "Right", "Vertical", "Horizontal", "Top", "Bottom", "Inside", "Outside", "Clockwise", "Counterclockwise", "Axis", The orientations or positional relationships indicated by "radial direction", "circumferential direction", etc. are based on the orientations or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply the referred devices or components. Must have a specific orientation, be constructed and operate in a specific orientation and are therefore not to be construed as limitations of the invention. In addition, features defined as “first” and “second” may explicitly or implicitly include one or more of these features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

In the description of the present invention, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. Connection, or 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 an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

As shown in Figure 1, the dynamic projection module applied to car lights of the present invention includes: multiple light sources 1, at least one lens 2, projection surface 3 and controller 5. The light source 1 is used to emit a light array, and the lens includes an incident Surface 21 and exit surface 22, light source 1 is located on the side of lens 2 close to the incident surface 21, projection surface 3 is located on the side of lens 2 close to the exit surface 22, the light array emitted by each light source 1 enters the lens 2 from the incident surface 21 and then From the exit surface 22 to the projection surface 3, a projection pattern 4 can be formed on the projection surface 3. The controller 5 is connected to the light source 1, and the controller 5 can control the lighting and extinguishing of the light source 1 to realize the projection pattern 4. dynamic changes. In other words, the present invention only uses the light source 1 and the lens 2 to project the desired projection pattern 4 on the projection surface 3. Compared with the existing technology, it not only reduces the number of parts and the complexity of the projection module, but also reduces the costs and improve the economic benefits of the enterprise.

Embodiment 1

As shown in Figures 2 to 3, the dynamic projection module of this embodiment includes a lens 2, and multiple light sources 1 correspond to the same lens 2. For example, it can be three light sources 1. The light source 1 can be an LED light source. The three light sources 1 are located on the side of the lens 2 close to the incident surface 21. The three light sources 1 can be arranged in a line, and the light source 1 in the middle can be at the focus of the incident surface 21. For example, the incident surface 21 of the lens 2 is a spherical surface, and the radius of curvature of the spherical surface is, for example, 100 mm. The exit surface 22 is a free-curved surface, and the concave directions of the incident surface 21 and the exit surface 22 are the same. Since the light rays emitted by the three light sources 1 have different incident angles when entering the incident surface 21 , the light rays emitted by the three light sources 1 can form projection patterns 4 with similar patterns but different positions on the projection surface 3 after passing through the lens 2 . When the controller 5 controls the three light sources 1 to light up in sequence, dynamic changes in the projection pattern 4 can be achieved. In this embodiment, there is a mapping relationship between the exit surface 22 and the projection pattern 4. For example, the light spot emitted by the light source 1 is generally circular, but the predetermined projection pattern 4 can be an arrow, and the shape of the projection pattern 4 is determined by the exit surface. The mapping relationship between the surface 22 and the projection pattern 4 is determined. Note that the incident point of the light ray on the incident surface 21 is P ₁ , the corresponding point of the incident point P ₁ on the exit surface 22 is P ₂ , the corresponding point of the corresponding point P ₂ on the projection surface 3 is P ₃ , and the corresponding points P ₂ and P ₃ There is a mapping relationship between them. Assume that the position of light source 1 is P ₀ , the refractive index of lens 2 is n, and the light

light

And the refractive index n satisfies the law of refraction, the light

light

And the refractive index n satisfies the law of refraction. In other words, when the light emitted by the light source 1 is deflected by the lens 2 and reaches the projection surface 3, a projection pattern 4 can be formed. The projection surface 3 can be the floor, wall, etc., and the projection pattern 4 can be arrows, letters, symbols, etc.

In this embodiment, a lens 2 is used with multiple light sources 1. The multiple light sources 1 are placed at different positions on one side of the lens 2. When the light from different light sources 1 enters the lens 2, there is the same incident point, but the incident direction and the exit direction are both the same. Differently, in this way, projection patterns 4 with similar shapes and different positions can be formed on the projection surface 3. When multiple light sources 1 are lit in sequence, dynamic changes of the projection patterns 4 can be presented.

Embodiment 2

As shown in Figure 4, the difference between Embodiment 2 and Embodiment 1 is that the number of light sources 1 in Embodiment 2 is equal to the number of lenses 2, and the light sources 1 and lenses 2 correspond one to one. For example, the number of light sources 1 and lenses 2 is three, and each light source 1 is located at the focus of the incident surface 21 of the lens 2. The surface shapes of the exit surfaces 22 of the three lenses 2 may be the same or different. The light emitted by each light source 1 can form a projection pattern 4 on the projection surface 3 after passing through the corresponding lens 2. When the light sources 1 are lit sequentially, the projection pattern 4 can be dynamically changed on the projection surface 3. Embodiment 1 Since multiple light sources 1 share one lens 2, each light source 1 can only form the same projection pattern 4, and among the multiple light sources 1, only the light source 1 located at the focus passes through the lens 2 to form the projection pattern 4 with the highest quality. Well, the projection pattern 4 formed by the light source 1 located outside the focus through the lens 2 will cause a certain image quality loss. Real-time Example 2: Since each light source 1 is equipped with a separate lens 2, each light source 1 of Example 2 can not only form different projection patterns 4, but also the image quality of the projection pattern 4 is better than that of Example 1.

Embodiment 3

As shown in Figure 5, a design method for a dynamic projection module applied to car lights uses the dynamic projection module applied to car lights of

Embodiment

1 or 2. The design method includes the following steps:

S1. Establish a preliminary model of lens 2;

S2. Establish the mapping relationship between the exit surface 22 and the projection pattern 4, and solve for the surface shape of the exit surface 22;

S3. Place the light source 1 on one side of the lens 2, and place the projection surface 3 on the other side of the lens 2, so that the light emitted by the light source 1 can form a predetermined projection pattern 4 on the projection surface 3 after passing through the lens 2;

S4. Connect the controller 5 to multiple light sources 1, and use the controller 5 to control the lighting and extinguishing of the light sources 1 to achieve dynamic changes in the projection pattern 4.

It should be noted that the surface shape of the exit surface 22 is an important factor in determining the projection pattern 4. Therefore, during design, the surface shape of the exit surface 22 needs to be determined in conjunction with the predetermined shape of the projection pattern 4. In order to facilitate calculation, the light source 1 of this embodiment is defined as a Lambertian light source, the light intensity distribution is I _θ =cos θ, the material of the lens 2 is defined as PMMA, and the optical refractive index is 1.492. First, the light array emitted by the light source 1 is divided into several light cones, the light energy of each light cone is the same, and the light at the center of the light cone is approximately represented as all the lights in the light cone. The light in this embodiment adopts radial angular distribution, that is, the radial angular spacing of the light is inversely proportional to θcosθ. In this way, each pipeline represents the same light energy.

In order to solve the surface shape of the exit surface 22 of the lens 2, a preliminary model of the lens 2 will first be built. The lens incident surface 21 is a spherical surface with a radius of curvature of 100mm. The exit surface 22 will first establish a curved surface. Then the mapping relationship between the exit surface 22 and the projection pattern 4 is established. Specifically, as shown in Figure 6, the intersection point of the light array emitted by the light source 1 and the incident surface 21 is marked as Ai, the intersection point of the light array and the exit surface 22 is marked as Bi, and the intersection point of the light array and the projection surface 3 is marked as Ci, i. =1,2,3,...,i, the intersection point Ai is determined by the isoluminous energy light cone, the intersection point Bi is determined by the law of refraction, the intersection point Ci is determined by the target illumination distribution of the projection surface 3, and the target illumination of the projection surface 3 is equal everywhere , so the intersection points Ci are equally spaced. After determining the intersection points Bi and Ci, the density of the intersection points Ci can be adjusted so that the number of intersection points Ci and Bi is equal, and then the mapping relationship between the intersection points Bi and Ci can be established, for example, according to center to center, edge to edge, top to edge The principles of top, bottom to bottom, left to left and right to right establish the mapping relationship between the intersection points Bi and Ci. The mapping relationship between the two intersection points is the mapping relationship between the exit surface 22 and the projection pattern 4 . On this basis, the local normal vector of the exit surface 22 of the lens 2 at an intersection Bi

can pass light

and the refractive index n of lens 2. Combined with the law of refraction, two conditions can be obtained as follows: (1) Local normal vector

light

as well as

The three are coplanar, (2) local normal vector

light

as well as

The three satisfy the law of refraction:

According to these two conditions, the local normal vector can be solved

Then, the surface shape of the exit surface 22 is obtained.

For example, establish a three-dimensional coordinate system with the position of light source 1 as the origin. Assume that the coordinate positions of light source 1 and intersection points A1, B1, and C1 are known. According to the above two conditions, the local normal vector of point B1 can be solved.

Then according to the local normal vector

and the coordinates of point B1 can be used to calculate the coordinates of the intersection near point B1.

For example, let the intersection point near point B1 be B2. Since the incident surface 21 of lens 2 is a known surface, the intersection point A2 of the light passing through B2 and the incident surface 22 of lens 2 is a known point. Therefore, the incident surface 21 of lens 2 The normal vector at the intersection point A2 is a known vector, and the refractive index of lens 2 is a known value. At A2, you can use the refraction formula (1) to solve for the light vector.

Then according to the local normal vector

and the coordinates of point B1, obtain the local tangent plane M1 of the emission surface 22 at the intersection point B1 (as shown in Figure 7); when the distance between point B2 and point B1 is small enough, point B2 can be considered to be located on the local tangent plane M1, Then the vector

The intersection point with the local cut plane M1 is the coordinate point of B2. According to this method, given an initial point coordinate of the exit surface 22 (for example, the center point coordinate), each local normal vector of the exit surface 22 of the lens 2 can be used

The point coordinates of the entire exit surface 22 are gradually solved, that is, the surface shape of the entire exit surface 22 is determined.

After the surface shape of the exit surface 22 is determined, the light emitted by the light source 1 can form a predetermined projection pattern 4 on the projection surface 3 after passing through the lens 2; the dynamic change of the projection pattern 4 can be achieved by lighting multiple light sources 1 sequentially through the controller 5 .

In summary, the dynamic projection module and its design method for car lights of the present invention adopt an optical scheme of non-imaging projection, and can realize projection on the projection surface 3 by using the lens 2 and the light source 1. By adjusting the lens 2 The design of the surface shape of the exit surface 22 can form a predetermined projection pattern 4; by lighting different light sources 1, the dynamic change of the projection pattern 4 can be achieved. The invention has a simple structure, reduces the number of parts and components, reduces the complexity of the optical system, can effectively reduce costs and create significant economic benefits.

Taking the above-mentioned ideal embodiments of the present invention as inspiration and through the above description, relevant workers can make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the description, and must be determined by the scope of the claims.

Claims

A dynamic projection module applied to car lights, which is characterized by including:

A plurality of light sources (1), the light sources (1) are used to emit a light array;

At least one lens (2), the lens includes an incident surface (21) and an exit surface (22), the light source (1) is located on the side of the lens (2) close to the incident surface (21);

Projection surface (3). The projection surface (3) is located on the side of the lens (2) close to the exit surface (22). The light array emitted by each of the light sources (1) passes from the incident surface (22). 21) Entering the lens (2) and then emitting from the exit surface (22) to the projection surface (3) can form a projection pattern (4) on the projection surface (3);

Controller (5), the controller (5) is connected to the light source (1), and the controller (5) can control the lighting and extinguishing of the light source (1) to realize the projection pattern ( 4) dynamic changes.
The dynamic projection module applied to car lights according to claim 1, characterized in that the number of the light sources (1) is equal to the number of the lenses (2), and the light sources (1) and the Lens (2) corresponds one to one.
The dynamic projection module applied to car lights according to claim 1, characterized in that the plurality of light sources (1) correspond to the same lens (2).
The dynamic projection module applied to car lights according to claim 2 or 3, characterized in that the incident surface (21) of the lens (2) is a spherical surface, and the exit surface (22) is a free-form surface, so The concave direction of the incident surface (21) and the exit surface (22) is the same.
The dynamic projection module applied to car lights according to claim 4, characterized in that there is a mapping relationship between the exit surface (22) and the projection pattern (4).
The dynamic projection module applied to car lights according to claim 5, characterized in that the incident point of the recorded light on the incident surface (21) is P 1 , and the incident point P 1 is on the exit surface (21) The corresponding point of 22) is P 2 , the corresponding point of the corresponding point P 2 on the projection plane (3) is P 3 , and there is a mapping relationship between the corresponding points P 2 and P 3 .
The dynamic projection module applied to car lights according to claim 6, characterized in that assuming that the position of the light source (1) is P 0 , the refractive index of the lens (2) is n, and the light
light
And the refractive index n satisfies the law of refraction, the light
light
And the refractive index n satisfies the law of refraction.
The dynamic projection module applied to car lights according to claim 5, characterized in that the shape of the projection pattern (4) is determined by the mapping between the exit surface (22) and the projection pattern (4). The relationship is confirmed.
A design method for a dynamic projection module applied to a car light, characterized in that it includes the dynamic projection module applied to a car light according to any one of claims 1 to 8, and the design method includes the following steps:

S1. Establish a preliminary model of lens (2);

S2. Establish the mapping relationship between the exit surface (22) and the projection pattern (4), and solve for the surface shape of the exit surface (22);

S3. Place the light source (1) on one side of the lens (2), and place the projection surface (3) on the other side of the lens (2), so that the light emitted by the light source (1) passes through the lens (2). ), a predetermined projection pattern (4) can be formed on the projection surface (3);

S4. Connect the controller (5) to multiple light sources (1), and use the controller (5) to control the lighting and extinguishing of the light sources (1) to achieve dynamic changes in the projection pattern (4).