Compact thick-wall optical system and vehicle lamp using same

Abstract

The utility model discloses a compact thick-wall optical system and a car lamp using the same. The compact thick-wall optical system comprises a light source assembly, a first lens, a second lens and a third lens, wherein the first lens, the second lens and the third lens are sequentially arranged in the light path transmission direction; the first lens is provided with a first incident plane suitable for light emitted by the light source assembly to enter and a first free-form surface suitable for light to exit. A second free-form surface, at least one total reflection surface and a scattering surface are formed on the second lens; light emitted by the first free-form surface enters the second lens through the second free-form surface, is reflected by the at least one total reflection surface and then is emitted to the third lens through the second scattering surface; the third lens is provided with a third scattering surface used for receiving the light emitted by the second lens and a light emitting surface used for projecting to form a light emitting type. According to the utility model, the plurality of free-form surfaces are utilized to collimate the light, the light collimation degree is high, the system utilization rate is high, and the brightness uniformity is good.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle lamps, in particular to a compact thick-walled optical system and a vehicle lamp using the same. Background Art

[0002] In thick-walled optical systems, the first step in optical design is typically to collimate the light path. Then, using diffuser patterns or scattering materials, the light is precisely diffused to the desired angle to meet regulatory or observer requirements. Conventional design approaches employ either reflective collimation or thick-walled lens-based collimation. Reflective collimation requires a larger space in the z-axis of the vehicle body's coordinates, while thick-walled lens-based collimation requires a larger space in the x-axis. With the advancement of intelligent vehicles, an increasing number of functional components (such as radar and projectors) need to be integrated into lamps, making the already compact space even more cramped.

[0003] In this regard, for example, patent publication number CN117287657A discloses a car and its headlights, and patent publication number CN 220205492 U discloses a daytime running light luminous structure with uniform light emission and compact structure. Both disclose a compact luminous structure, the general principle of which is to use total reflection to bend light to effectively utilize the internal space of the headlight.

[0004] However, the bent optical path system has high requirements for the collimation of light. The design concept of the traditional collimator collimator lens divides the light emitted by the light source into two parts for collimation. One part passes through the middle free-form surface, and the other part passes through the side free-form surface to be collimated after the light is returned. This design method has two requirements. First, the larger the size of the collimator relative to the area of the light source, the higher the collimation of the light, and sufficient space must be reserved. Second, the collimated light is divided into two parts for output. In this case, it is difficult to achieve a seamless connection between the two parts of the collimated light, that is, a dark area will inevitably appear between the two parts of light, thus affecting the uniformity. In order to eliminate this dark area, it is necessary to add a diffusion pattern to disperse the light. Under such a structure, the collimation of the light emitted by the collimator will inevitably be affected, which will ultimately affect the efficiency of the optical system.

[0005] Therefore, based on the problems existing in the compact optical system of the prior art, it is necessary to further improve its structure. Utility Model Content

[0006] The purpose of the utility model is to provide a compact thick-walled optical system to solve the technical problem of taking into account both the compactness of the structure and the uniformity of the light output.

[0007] The purpose of the utility model is to provide a vehicle lamp to solve the technical problem of balancing the compactness of the structure and the uniformity of the light output.

[0008] The compact thick-walled optical system of the present invention is realized as follows:

[0009] A compact thick-walled optical system comprises: a light source assembly and a first lens, a second lens and a third lens sequentially arranged along a light transmission direction;

[0010] The first lens is formed with a first incident surface suitable for the light emitted by the light source assembly to enter and a first free-form surface suitable for the light to exit;

[0011] The second lens is formed with a second free-form surface, at least one total reflection surface, and a scattering surface; light emitted from the first free-form surface enters the second lens through the second free-form surface, is reflected by the at least one total reflection surface, and then is emitted from the second scattering surface to the third lens;

[0012] The third lens is formed with a third scattering surface for receiving the light emitted by the second lens and a light emitting surface for projecting to form a light emitting pattern.

[0013] In an optional implementation of the present invention, the light source assembly includes a PCB board and light-emitting components arranged on the PCB board.

[0014] In an optional implementation of the present invention, the first free-curved surface is a spherical surface convex toward the second lens.

[0015] In an optional embodiment of the present invention, the incident angle θ of the light emitted by the light-emitting component, the radius r of the light-emitting surface of the light-emitting component, the distance h between the light-emitting center of the light-emitting component and the first incident surface, and the effective radius R of the first free-form surface satisfy the following relationship:

[0016] R = r + h * tan (θ).

[0017] In an optional embodiment of the present invention, the second lens is formed with a total reflection surface 1, a total reflection surface 2 and a total reflection surface 3 arranged in sequence along the light transmission direction; wherein

[0018] The total reflection surface three is located beside the first lens, and the first reflection surface and the second reflection surface are both located in the lower area of the first lens facing away from the light source assembly;

[0019] The second total reflection surface is parallel to the third total reflection surface, so that the light path is folded back through the first total reflection surface, the second total reflection surface and the third total reflection surface.

[0020] In an optional implementation of the present invention, the angle α1 between the total reflection surface 1 and the optical axis, the angle α2 between the total reflection surface 2 and the optical axis, the incident angle β1 of the light on the total reflection surface 1, and the incident angle β2 of the light on the total reflection surface 2 satisfy the following relationship:

[0021] α1=β1>arcsin(1 / n), and α2=β2>arcsin(1 / n);

[0022] Where n is the refractive index of the second lens.

[0023] In an optional implementation of the present invention, both α1 and α2 are greater than 43°.

[0024] In an optional implementation of the present invention, the second scattering surface and / or the third scattering surface are designed with leather grain or visual angle pattern.

[0025] In an optional implementation of the present invention, the second lens is connected to the first lens via a second positioning column; and

[0026] The first lens is connected to the PCB board through a first positioning column.

[0027] The headlight of the present utility model is realized as follows:

[0028] A vehicle lamp comprises: the compact thick-walled optical system.

[0029] By adopting the above technical solution, the present invention has the following beneficial effects: First, the compact thick-walled optical system and the vehicle lamp using it utilize multiple free-form surfaces to collimate light, resulting in high light collimation, high system utilization, and good brightness uniformity. Second, the light path is folded back through multiple total reflection planes, effectively utilizing the interior space of the vehicle lamp and providing a high degree of design freedom. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Schematic diagram of the overall structure of the compact optical system of Example 1;

[0031] Figure 2 Schematic diagram of the exploded structure of the compact optical system of Example 1;

[0032] Figure 3 Schematic diagram of the coordination structure of the components of the compact optical system of Example 1;

[0033] Figure 4 Schematic diagram of the optical path corresponding to the compact optical system of Example 1;

[0034] Figure 5 Schematic diagram of the optical path decomposition at the incident end of the light corresponding to the compact optical system of Example 1;

[0035] Figure 6 Schematic diagram of the optical path corresponding to the compact optical system of Example 1 being folded back between multiple total reflection surfaces.

[0036] In the figure: light source assembly 1, PCB board 1.1, light-emitting component 1.2, first lens 2, first incident surface 2.1, first free-form surface 2.2, second lens 3, second free-form surface 3.1, total reflection surface 1 3.2, total reflection surface 2 3.3, total reflection surface 3 3.4, second scattering surface 3.5, third lens 4, third scattering surface 4.1, light exit surface 4.2, second positioning post 5, first positioning post 6. DETAILED DESCRIPTION

[0037] 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.

[0038] Example 1:

[0039] See also Figures 1 to 6 As shown, this embodiment provides a compact thick-walled optical system, comprising: a light source assembly 1 and a first lens 2, a second lens 3, and a third lens 4 arranged in sequence along the light path transmission direction; the light source assembly 1 comprises a PCB board 1.1 and a light-emitting component 1.2 arranged on the PCB board 1.1. In an optional embodiment herein, the second lens 3 is connected to the first lens 2 via a second positioning post 5; and the first lens 2 is connected to the PCB board 1.1 via a first positioning post 6. As for the third lens 4, it is not directly connected to the second lens 3. Instead, when the compact thick-walled optical system of this embodiment is applied to a specific vehicle lamp, the third lens 4 and the second lens 3 are respectively connected to the housing of the vehicle lamp to ensure the stability of the relative position between the third lens 4 and the second lens 3.

[0040] Regarding the PCB board 1.1 used in this embodiment, it can be a hard board, which is installed above the light-emitting component 1.2. When the styling surface of the lamp using the compact thick-walled optical system of this embodiment has a large curvature in the x- and y-directions of the vehicle body coordinates, the PCB hard board installed above the light-emitting component 1.2 can meet the requirements of the light source's luminous center being arranged along the styling surface without wasting space, and the heat dissipation area can also be maximized, and the cost is relatively low.

[0041] More specifically, the first lens 2 is formed with a first incident surface 2.1 for light emitted from the light source assembly 1 to enter, and a first free-form surface 2.2 for light to exit. Here, in conjunction with the accompanying drawings, an optional embodiment is provided in which the first free-form surface 2.2 is a hemispherical surface convex toward the second lens 3.

[0042] Secondly, a second free-form surface 3.13.1, at least one total reflection surface and a scattering surface are formed on the second lens 3; after the light emitted from the first free-form surface 2.2 enters the second lens 3 through the second free-form surface 3.13.1, it is reflected by at least one total reflection surface and then emitted by the second scattering surface 3.5 to the third lens 4. The second free-form surface 3.13.1 here can be optionally a hemispherical surface convex toward the first free-form surface 2.2, and the centers of the second free-form surface 3.13.1 and the first free-form surface 2.2 are arranged in correspondence, so that the tops of the hemispherical surfaces of the two free-form surfaces are arranged in correspondence. This embodiment uses the first lens 2 and the second lens 3 to form a set of optical path collimation structures, which can collect and collimate the light emitted by the light source assembly 1.

[0043] The second lens 3 here consists of two parts in terms of appearance. One part is used to be assembled with the first lens 2 to receive and reflect the light emitted by the first lens 2. The other part is used to cooperate with the third lens 4 and extend toward one side of the third lens 4 to realize the transmission of light to the third lens 4 after reflecting the light.

[0044] Furthermore, the third lens 4 is formed with a third scattering surface 4.1 for receiving light emitted by the second lens 3 and a light exiting surface 4.2 for projecting light to form an exiting light pattern. The third lens 4 can be made of transparent material or scattering material, or can be made of colored light-transmitting material according to the design requirements.

[0045] Based on the above situation, it should be noted that the incident angle θ of the light emitted by the light-emitting component 1.2, the radius r of the light-emitting surface of the light-emitting component 1.2, the distance h between the light-emitting center of the light-emitting component 1.2 and the first incident surface 2.1, and the effective radius R of the first free-form surface 2.2 satisfy the following relationship: R=r+h*tan(θ).

[0046] In addition, it is necessary to explain that, with reference to the accompanying drawings, for example, the second lens 3 of this embodiment is formed with a total reflection surface 1, a total reflection surface 2 3.3 and a total reflection surface 3.4 arranged in sequence along the light path transmission direction; wherein the total reflection surface 3.4 is located beside the first lens 2, and the first reflection surface and the second reflection surface are both located in the lower area of the first lens 2 facing away from the light source assembly 1. Among them, the total reflection surface 2 3.3 is parallel to the total reflection surface 3.4, so as to fold the light path back through the total reflection surface 1, the total reflection surface 2 3.3 and the total reflection surface 3.4. It should be noted that the transmission distance L of the light to the second scattering surface 3.51 after passing through the total reflection surface 3.4 can be reduced or increased according to the size of the space, and the specific numerical range of the distance L is not absolutely limited in this embodiment.

[0047] It should be noted that when the z-direction reserved space corresponding to the vehicle body coordinates of a lamp using the compact thick-walled optical system of this embodiment is insufficient, increasing the number of total reflection surfaces (for example, the combination of total reflection surface 1, total reflection surface 2 3.3, and total reflection surface 3.4 of this embodiment) can effectively reduce the space above. When the z-direction reserved space of the vehicle body coordinates is sufficient, the light path can be folded back only through total reflection surface 1. The specific number of reflective surfaces can be selected adaptively based on the different mounting hole requirements of different vehicle bodies for the lamp, and this embodiment does not impose an absolute limit on this.

[0048] The angle α1 between total reflection surface 1 and the optical axis, the angle α2 between total reflection surface 2 3.3 and the optical axis, the angle β1 of light incident on total reflection surface 1, and the angle β2 of light incident on total reflection surface 2 3.3 satisfy the following relationships: α1 = β1 > arcsin(1 / n), and α2 = β2 > arcsin(1 / n); where n is the refractive index of second lens 3. Total internal reflection occurs when light travels from a denser medium to a less dense medium. Typically, automotive thick-walled lenses are made of transparent PC or transparent acrylic. This means that when α1 and α2 are greater than 43°, total internal reflection conditions are generally met.

[0049] In one specific alternative embodiment, the second scattering surface 3.5 can be designed with a grain or visual angle pattern to redistribute the collimated light and improve system uniformity. The third scattering surface 4.1 can also be designed with a grain or visual angle pattern to adjust the light viewing angle, improving system uniformity while meeting regulatory requirements for visual angle brightness.

[0050] In summary, the compact thick-walled optical system of this embodiment utilizes multiple free-form surfaces to collimate light, resulting in high light collimation, high system utilization, and excellent brightness uniformity. Furthermore, the use of multiple total reflection planes to fold the light path effectively utilizes the interior space of the headlight and provides a high degree of design freedom.

[0051] Example 2:

[0052] Based on the compact thick-walled optical system of Example 1, this embodiment provides a vehicle lamp, including: the compact thick-walled optical system of Example 1.

[0053] 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 scope of protection of the present invention.

[0054] In the description of the present invention, it should be understood that the terms indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and 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 orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0055] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0056] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0057] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0058] In the present invention, unless otherwise expressly specified or 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 being in contact not directly but through another feature between them. Furthermore, a first feature being above, above, and above the 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 the 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

1. A compact thick-walled optical system, characterized in that: include: A light source assembly and a first lens, a second lens and a third lens sequentially arranged along the light transmission direction; The first lens is formed with a first incident surface suitable for the light emitted by the light source assembly to enter and a first free-form surface suitable for the light to exit; The second lens is formed with a second free-form surface, at least one total reflection surface, and a scattering surface; light emitted from the first free-form surface enters the second lens through the second free-form surface, is reflected by the at least one total reflection surface, and then is emitted from the second scattering surface to the third lens; The third lens is formed with a third scattering surface for receiving the light emitted by the second lens and a light emitting surface for projecting to form a light emitting pattern.

2. The compact thick-walled optical system according to claim 1, characterized in that The light source assembly includes a PCB board and light-emitting components arranged on the PCB board.

3. The compact thick-walled optical system according to claim 2, wherein: The first free-curved surface is a spherical surface convex toward the second lens.

4. The compact thick-walled optical system according to claim 3, characterized in that The incident angle θ of the light emitted by the light-emitting component, the radius r of the light-emitting surface of the light-emitting component, the distance h between the light-emitting center of the light-emitting component and the first incident surface, and the effective radius R of the first free-form surface satisfy the following relationship: 。 5. The compact thick-walled optical system according to any one of claims 1 to 4, characterized in that: The second lens is formed with a total reflection surface 1, a total reflection surface 2 and a total reflection surface 3 arranged in sequence along the light transmission direction; wherein The total reflection surface three is located beside the first lens, and the first reflection surface and the second reflection surface are both located in the lower area of the first lens facing away from the light source assembly; The second total reflection surface is parallel to the third total reflection surface, so that the light path is folded back through the first total reflection surface, the second total reflection surface and the third total reflection surface.

6. The compact thick-walled optical system according to claim 5, characterized in that The angle α1 between the total reflection surface 1 and the optical axis, the angle α2 between the total reflection surface 2 and the optical axis, the incident angle β1 of the light on the total reflection surface 1, and the incident angle β2 of the light on the total reflection surface 2 satisfy the following relationship: α1= β1>arcsin(1 / n), and α2= β2>arcsin(1 / n); Where n is the refractive index of the second lens.

7. The compact thick-walled optical system according to claim 6, characterized in that Both α1 and α2 are greater than 43°.

8. The compact thick-walled optical system according to claim 1, wherein: The second scattering surface and / or the third scattering surface are designed with leather grain or visual angle pattern.

9. The compact thick-walled optical system according to claim 2, wherein: The second lens is connected to the first lens via a second positioning column; and The first lens is connected to the PCB board through a first positioning column.

10. A vehicle lamp, characterized in that: include: A compact thick-walled optical system according to any one of claims 1 to 9.

Images