Reflection type optical system

Abstract

The utility model relates to the technical field of car lamps, in particular to a reflective optical system, which comprises at least one collimation structure for forming parallel light or approximately parallel light on at least one plane; the reflection structure is located in the light emitting direction of the collimation structure, the reflection structure comprises at least one pair of reflection units, each pair of reflection units are oppositely arranged, the contour line of each pair of reflection units comprises a parabola part, and the parabola parts of each pair of reflection units have a common focus. According to the reflection type optical system, the light emitted by the light source is collimated into parallel light or approximately parallel light through the collimation structure, then the light is reflected through the reflection units, the contour line of each pair of reflection units respectively comprises a parabolic part, and the parabolic parts of the two reflection units have the same focus, so that the reflection type optical system has the advantages that the reflection effect is good; therefore, the horizontal irradiation angle of the reflected light can be large, the uniformity is good, and the illumination value is high.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle lamps, in particular to a reflective optical system. Background Art

[0002] The existing solutions for achieving uniform projection with large horizontal angles and certain vertical angles in a narrow opening shape are:

[0003] 1. Using LED direct projection, although this solution has a simple structure, it has low light efficiency and cannot form a clear cutoff line when used for low beam widening. In addition, the projected bright spot deviates from the cutoff line, which is disadvantageous for the illumination intensity and illumination distance of the low beam.

[0004] 2. The imaging unit is combined with the primary optical unit. The primary optical unit performs primary shaping on the light emitted by the light source. Compared with the LED direct projection solution, the illumination value of this solution is higher, but the left and right widths are limited and the uniformity is difficult to optimize. Utility Model Content

[0005] The technical problem to be solved by the present invention is: in order to solve the technical problems in the existing technology, the present invention provides a reflective optical system, which can achieve uniform projection with a large horizontal angle and a certain vertical angle under the shape of a narrow light output height; it is suitable for low beam widening, corner lights, front fog lights and signal lights, etc.

[0006] The technical solution adopted by the utility model to solve its technical problems is: a reflective optical system, including a collimating structure, provided with at least one, to realize the formation of parallel light or approximately parallel light in at least one plane; a reflective structure, located in the light output direction of the collimating structure, the reflective structure including at least one pair of reflective units, each pair of the reflective units being arranged opposite to each other, the contour lines of each pair of the reflective units each including a parabolic portion, and the parabolic portions of the two pairs have a common focus.

[0007] The utility model provides a reflective optical system, which collimates the light emitted by a light source into parallel light or approximately parallel light through a collimating structure, and then reflects the light through a reflecting unit. Since the contour lines of each pair of reflecting units each include a parabolic portion, and the parabolic portions of the two have a common focus, the horizontal illumination angle of the reflected light can be larger, the uniformity is better, and the illumination value is higher.

[0008] Furthermore, the collimating structure is a condenser, a reflector or a lens.

[0009] Furthermore, the focal lengths of the parabolic parts included in the two contour lines of each pair of the reflection units are the same.

[0010] Furthermore, the focal lengths of the parabolic parts included in the two contour lines of each pair of the reflection units are different.

[0011] Furthermore, each pair of the reflection units is formed by a contour line extending along a normal direction.

[0012] Furthermore, the surface of the reflection unit has a pattern.

[0013] Furthermore, each of the collimating structures corresponds one-to-one to a pair of reflecting units, or each pair of reflecting units corresponds to a plurality of collimating structures.

[0014] Furthermore, the collimating structure and the reflective structure are integrally formed; the reflective structure has a reflective function through internal total reflection or external coating of reflective material.

[0015] Furthermore, when used for the low beam assist function, an optical unit having a cut-off line shape is placed at the focus of the reflective unit to form a cut-off line.

[0016] Furthermore, a refraction unit is provided in the light emitting direction of the reflective structure to achieve uniform light distribution.

[0017] The beneficial effects of the present invention are:

[0018] 1. The light emitted by the light source is collimated into parallel light or approximately parallel light through the collimating structure, and then the light is reflected by the reflecting unit. Since the contour lines of each pair of reflecting units each contain a parabola part, and the parabola parts of the two have a common focus, the horizontal illumination angle of the reflected light can be larger, the uniformity is better, and the illumination value is higher;

[0019] 2. By making patterns on the surface of the reflective unit or setting a refraction unit in the light-emitting direction, the projection angle in the horizontal direction can be increased and uniform distribution can be achieved;

[0020] 3. The required light distribution illumination can be achieved by adjusting the focal length of each reflective unit;

[0021] 4. The focal length of each pair of reflective units can be adjusted to adapt to shapes with different opening sizes. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] Figure 1 It is a schematic structural diagram of an overall reflective optical system in the present invention.

[0024] Figure 2 This is a light principle diagram of the solution in the vertical plane in Example 1 of the utility model.

[0025] Figure 3 This is a schematic diagram showing that the optical structures in Example 2 of the present invention are integrated.

[0026] Figure 4 This is a schematic diagram of adding an optical unit with a bright / dark cutoff line shape when the present solution is used as a low beam in Example 3 of the present utility model.

[0027] Figure 5 This is the light pattern of this solution in the utility model.

[0028] In the figure: 1. collimating structure; 2. reflecting structure; 21. first reflecting unit; 22. second reflecting unit; a. first parabola; b. second parabola; 3. optical unit; 4. refractive unit. DETAILED DESCRIPTION

[0029] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0031] The utility model discloses a reflective optical system.

[0032] Reference Figure 1 、 Figure 2 and Figure 5A reflective optical system includes a collimating structure 1 and a reflecting structure 2. The collimating structure 1 is provided with at least one structure to realize the formation of parallel light or approximately parallel light in at least one plane. The reflecting structure 2 is located in the light emitting direction of the collimating structure 1. The reflecting structure 2 includes at least one pair of reflecting units. Each pair of reflecting units is arranged opposite to each other. The contour lines of each pair of reflecting units each include a parabolic part, and the parabolic parts of the two pairs have a common focus. The light emitted by the light source is collimated into parallel light or approximately parallel light by the collimating structure 1, and then the light is reflected by the reflecting unit. Since the contour lines of each pair of reflecting units each include a parabolic part, and the parabolic parts of the two pairs have a common focus, the parabolic parts of the two pairs can have different focal lengths, thereby achieving matching of different opening size shapes and being able to control the projection angle in the vertical direction; different illumination values ​​can also be achieved through different focal lengths.

[0033] Example 1:

[0034] The collimating structure 1 can be a condenser, a reflector, a Fresnel lens, or any other structure that can collimate the light emitted by the light source into parallel light or approximately parallel light. In this embodiment, the collimating structure 1 can collimate the light in the vertical plane passing through the Z axis and in the horizontal plane passing through the Z axis. The optical system can include multiple collimating structures 1, and the collimating structures 1 can be arranged along the horizontal direction. The horizontal direction can be a horizontal straight line direction or a horizontal trend line or curve direction.

[0035] In this embodiment, each pair of reflective units includes a first reflective unit 21 and a second reflective unit 22 arranged relative to each other in a vertical direction. In a vertical plane passing through the Z-axis, the contours of the first reflective unit 21 and the second reflective unit 22 respectively include a first parabola a and a second parabola b. The foci of the first parabola a and the second parabola b coincide, and are marked as F. The first parabola a and the second parabola b have different focal lengths. To achieve a narrower light output height, the focal length of the first parabola a can be selected to be greater than the focal length of the second parabola b. In this case, the contours can be extended along the normal direction to form the first reflective unit 21 and the second reflective unit 22.

[0036] In this embodiment, at least one collimating structure 1 may correspond to a pair of reflective units. Furthermore, the reflective structure 2 may also be formed by arranging a pair of reflective units. The focal lengths of the parabolic portions included in the two contour lines of each pair of reflective units may be the same or different, and the focal length or focal position of each pair of reflective units may be flexibly adjusted.

[0037] Example 2:

[0038] Reference Figure 3The difference from Example 1 is that the surface of the reflective unit can be made into a microstructure or pattern to improve the uniformity of light distribution; or a refraction unit 4 can be set in the light output direction of the reflective structure 2. The function of the refraction unit 4 is to further improve the uniform distribution of light, thereby ensuring a large horizontal illumination angle and good uniformity.

[0039] Example 3:

[0040] Reference Figure 4 When used for the low beam assist function, an optical unit 3 having a light / dark cutoff line shape can be placed at the focus F. Since the focus of the second reflecting unit 22 in the vertical plane is also located at F, the second reflecting unit 22 images the light distribution near the focus F in the vertical direction, and finally a clear cutoff line can be formed in the vertical direction.

[0041] Example 4:

[0042] The collimating structure 1 and the reflecting structure 2 can be integrated or separated into independent parts. When integrated, the reflecting unit can realize the reflection function through total internal reflection or by coating the outer surface with reflective material.

[0043] Working Principle: The collimating structure 1 performs preliminary shaping on the light emitted by the light source, primarily to form approximately parallel light within a vertical plane and then enter the reflective structure 2. After the parallel light passes through the first reflective unit 21, since the first reflective unit 21 has a focus F within the vertical plane, when the input is approximately parallel light, after passing through the first reflective unit 21, the light can be converged near the focus F area within the plane. In other words, the function of the first reflective unit 21 is to converge the light input from the collimating structure 1 near the focus F within the vertical plane.

[0044] The focal points of the first reflecting unit 21 and the second optical unit in the vertical plane coincide with each other. The light converged by the first reflecting unit 21 to the vicinity of the focus F is analogous to an LED light source. The focus of the second reflecting unit 22 is also located at the focus F, that is, the second reflecting unit 22 images the light distribution at the focus F, so a higher illumination value can be obtained, and the light uniformity is better.

[0045] Therefore, especially when used in low beam, the light type needs to have a cut-off line. Then, an optical unit with a cut-off line shape can be placed at the focus of the reflection unit (i.e., the imaging unit), so that a clear cut-off line shape can be achieved.

[0046] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A reflective optical system, characterized in that: include A collimating structure (1) is provided with at least one, which realizes the formation of parallel light or approximately parallel light in at least one plane; The reflective structure (2) is located in the light emitting direction of the collimating structure (1), and the reflective structure (2) includes at least one pair of reflective units, each pair of reflective units is arranged opposite to each other, and the contour lines of each pair of reflective units each include a parabolic portion, and the parabolic portions of the two pairs have a common focus.

2. A reflective optical system according to claim 1, characterized in that: The collimating structure (1) is a condenser, a reflector or a lens.

3. The reflective optical system according to claim 1, wherein: The focal lengths of the parabolic parts included in the two contour lines of each pair of the reflecting units are the same.

4. The reflective optical system according to claim 1, wherein: The focal lengths of the parabolic parts included in the two contour lines of each pair of the reflecting units are different.

5. The reflective optical system according to claim 1, wherein: Each pair of the reflection units is formed by a contour line extending along a normal direction.

6. The reflective optical system according to claim 1, wherein: The surface of the reflection unit is provided with patterns.

7. A reflective optical system according to claim 1, characterized in that: Each of the collimating structures (1) corresponds one-to-one to a pair of reflecting units, or each pair of reflecting units corresponds to a plurality of collimating structures (1).

8. A reflective optical system according to claim 7, characterized in that: The collimating structure (1) and the reflecting structure (2) are an integrated part; The reflective structure (2) has a reflective function through internal total reflection or external coating of reflective materials.

9. The reflective optical system according to claim 1, wherein: When used for the low beam auxiliary function, an optical unit (3) having a cut-off line shape is placed at the focus of the reflection unit to form the cut-off line.

10. The reflective optical system according to claim 1, wherein: A refraction unit (4) is provided in the light-emitting direction of the reflective structure (2) to achieve uniform light distribution.

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