Optical system for a motor vehicle headlamp

Abstract

The utility model discloses an optical system for an automobile headlamp. The optical system comprises a primary optical system, a cut-off line unit, a refracting surface and an imaging system which are sequentially arranged along a light path propagation direction, wherein the primary optical system is used for converging light emitted by the light source at a focus F, the cut-off line unit is used for realizing a cut-off line shape of a final light type, and the imaging system is used for imaging light distribution at the focus F in two mutually perpendicular directions. The illuminating function of the headlamp can be achieved through the primary optical system, the cut-off line unit, the refracting face and the imaging system, compared with a thick-wall piece with a total reflection face and an inner lens light-emitting face serving as a whole, the weight of the whole optical system can be reduced through the mode, and then the weight of the whole headlamp can be reduced; and subsequent installation and use of the headlamp are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile lamps, in particular to an optical system used for automobile headlights. Background Art

[0002] Today's technology is developing rapidly, and automotive lighting technology is also constantly improving. The design of headlights is more compact, not only to meet regulatory requirements, but also to be more technological.

[0003] For example, the Chinese patent (CN219493905U) discloses a concentrator headlamp optical system, a lighting device and a vehicle lamp. In this solution, a light source, an optical transmission component and an outer lens are sequentially arranged along the light path propagation direction, wherein the optical transmission component includes a concentrator, a total reflection surface and an inner lens light emitting portion sequentially arranged from the light incident side to the light emitting side. The concentrator, the total reflection surface and the inner lens light emitting portion are integrated as thick-walled components. Although they have a relatively small assembly tolerance and more stable optical performance, this solution has more thick-walled component structures and is heavier, resulting in a heavier weight for the entire headlamp. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in order to solve the technical problem that the existing headlight optical system is heavy and thus the weight of the entire headlight is heavy, the utility model provides an optical system for a car headlight, and by improving the structure of the headlight optical system, the weight of the optical system can be reduced, and then the weight of the entire headlight can be reduced.

[0005] The utility model solves the technical problem by adopting a technical solution: an optical system for a car headlight, comprising: a primary optical system, a cutoff line unit, a refractive surface and an imaging system arranged in sequence along the propagation direction of the light path; wherein: the primary optical system is used to converge the light emitted by the light source at a focus F, the cutoff line unit is used to realize the cutoff line shape of the final light type, and the imaging system is used to image the light distribution at the focus F in two mutually perpendicular directions.

[0006] Therefore, when imaging, the illumination function of the headlight can be achieved only through the primary optical system, the cut-off line unit, the refractive surface and the imaging system. Compared with a thick-walled part that uses a total reflection surface and an inner lens light-emitting surface as an integral whole, this method can reduce the weight of the entire optical system, and thus can reduce the weight of the entire headlight, making it easier for the subsequent installation and use of the headlight.

[0007] Furthermore, the primary optical system is a condenser or a reflector.

[0008] Further, the cut-off line unit is a surface having a cut-off line shape, and the cut-off line shape is a straight line or an inverted trapezoid.

[0009] Furthermore, the surface of the cut-off line unit is plated with aluminum, thereby the cut-off line unit can have a certain reflection effect through aluminum plating.

[0010] Furthermore, the imaging system includes: a first imaging unit and a second imaging unit, the contour line of the first imaging unit in the vertical plane is an arc with the focus F as the center, the contour line of the first imaging unit in the horizontal plane has the function of imaging the light distribution in the focus F area, and the contour line of the second imaging unit in the vertical plane has the function of imaging the light distribution in the focus F area.

[0011] Furthermore, the second imaging unit is an optical structure with a refraction or reflection function; wherein: the second imaging unit comprises: a light incident surface and a light emitting surface, and the contour lines of the light incident surface and the light emitting surface in a horizontal plane are parallel to each other.

[0012] Furthermore, the contour line of the second imaging unit in the horizontal plane is composed of two mutually parallel straight lines or a biconvex curve, and the contour line of the second imaging unit in the vertical plane is any one of plano-convex, convex-planar, and biconvex.

[0013] Further, a contour line of the second imaging unit in the vertical plane is a parabola or a quasi-parabola, and the contour line extends along the normal direction of the vertical plane to form the second imaging unit.

[0014] Furthermore, the surface of the second imaging unit is plated with aluminum, thereby enabling the second imaging unit to have a reflective function through aluminum plating.

[0015] Furthermore, the cut-off line unit is provided with the primary optical system at both ends of the upper and lower sides away from the refractive surface, wherein the two primary optical systems are distributed along the vertical direction, thereby meeting the dual light function of high and low beam in one.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] During imaging, the illumination function of the headlight can be achieved only through the primary optical system, the cut-off line unit, the refractive surface and the imaging system. Compared with a thick-walled part that uses a total reflection surface and an inner lens light-emitting surface as an integral whole, this method can reduce the weight of the entire optical system, and thus reduce the weight of the entire headlight, making it easier for the subsequent installation and use of the headlight. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 This is a schematic structural diagram of an optical system for a vehicle headlight according to Example 1;

[0020] Figure 2 This is a schematic structural diagram of an optical system for a vehicle headlight in a vertical plane according to Example 1;

[0021] Figure 3 It is a schematic structural diagram of the second imaging unit of Example 1, in which the contour line of the second imaging unit in the vertical plane is plano-convex;

[0022] Figure 4 It is a schematic structural diagram of the second imaging unit of Example 1, in which the contour line of the second imaging unit in the vertical plane is convex and flat;

[0023] Figure 5 is a schematic structural diagram of a second imaging unit in Example 1, in which the contour line in the vertical plane is convex and concave;

[0024] Figure 6 This is a schematic structural diagram of an optical system for a vehicle headlight in which the second image is a reflector according to Example 1;

[0025] Figure 7 It is a schematic structural diagram of the dual-light optical system for integrating high and low beams in a vertical plane of Example 2.

[0026] In the figure: 1, primary optical system; 2, cut-off line unit; 3, refractive surface; 4, imaging system; 5, first imaging unit; 6, second imaging unit; 601, light incident surface; 602, light exit surface. DETAILED DESCRIPTION

[0027] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.

[0028] In the description of the present utility model, it is necessary to understand that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model 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 utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] Embodiment 1:

[0031] like Figures 1 to 6 As shown, an optical system for a car headlight comprises: a primary optical system 1, a cutoff unit 2, a refractive surface 3 and an imaging system 4 which are sequentially arranged along the propagation direction of the light path; wherein: the primary optical system 1 is used to converge the light emitted by the light source at a focus F, the cutoff unit 2 is used to realize the cutoff shape of the final light type, and the imaging system 4 is used to image the light distribution at the focus F in two mutually perpendicular directions. Thus, when imaging, the illumination function of the headlight can be realized only through the primary optical system 1, the cutoff unit 2, the refractive surface 3 and the imaging system 4. Compared with using the total reflection surface and the inner lens light emitting surface 602 as an integrated thick-walled part, this method can reduce the weight of the entire optical system, and further reduce the weight of the entire headlight, which is convenient for the subsequent installation and use of the headlight.

[0032] Specifically, the light of the cut-off line unit 2 can be refracted by the refractive surface 3 .

[0033] In this embodiment, the primary optical system 1 is a condenser or a reflector. Specifically, the primary optical system 1 can also be any optical unit that can achieve uniform distribution of light emitted by the light source and converge it near the focus F area.

[0034] In this embodiment, the cutoff line unit 2 is a surface with a cutoff line shape, the cutoff line shape is a straight line or an inverted trapezoid (bathtub shape), and the surface of the cutoff line unit 2 is aluminum-plated. Therefore, the aluminum plating can make the cutoff line unit 2 have a certain reflection effect.

[0035] In this embodiment, the imaging system 4 includes: a first imaging unit 5 and a second imaging unit 6, the contour line of the first imaging unit 5 in the vertical plane is an arc with the focus F as the center, the contour line of the first imaging unit 5 in the horizontal plane has the function of imaging the light distribution in the focus F area, and the contour line of the second imaging unit 6 in the vertical plane has the function of imaging the light distribution in the focus F area; the second imaging unit 6 is an optical structure with a refractive or reflective function; wherein: the second imaging unit 6 includes: a light incident surface 601 and a light exit surface 602, the contour lines of the light incident surface 601 and the light exit surface 602 in the horizontal plane are parallel to each other; the contour line of the second imaging unit 6 in the horizontal plane is a line containing two parallel straight lines or a biconvex curve, and the contour line of the second imaging unit 6 in the vertical plane is any one of flat convex, convex flat, and biconvex; the contour line of the second imaging unit 6 in the vertical plane is a parabola or a parabola-like line, and the contour line extends along the normal of the vertical plane to form the second imaging unit 6; the surface of the second imaging unit 6 is aluminum-plated. Therefore, the second imaging unit 6 can have a reflective function by aluminum plating.

[0036] Specifically, when the second imaging unit 6 has a refractive function, the second imaging unit 6 adopts a convex mirror, and when the second imaging unit 6 has a reflective function, the second imaging unit 6 adopts a transmitting mirror.

[0037] The imaging process of the optical system of the present invention is: the light source is started, and the light emitted by the light source passes through the primary optical system 1, the refractive surface 3, the first imaging unit 5 and the light incident surface 601 in sequence, and is finally emitted through the light exit surface 602.

[0038] Embodiment 2:

[0039] like Figure 7 As shown, the difference from Example 1 is that both upper and lower ends of the cut-off line unit 2 away from the refractive surface 3 are provided with primary optical systems 1, wherein: the two primary optical systems 1 are distributed along the vertical direction. Thus, the dual light function of high and low beams can be satisfied.

[0040] To sum up, during imaging, the illumination function of the headlight can be realized only through the primary optical system 1, the cut-off line unit 2, the refractive surface 3 and the imaging system 4. Compared with using the total reflection surface and the inner lens light-emitting surface 602 as an integrated thick-walled part, this method can reduce the weight of the entire optical system, and then reduce the weight of the entire headlight, which is convenient for the subsequent installation and use of the headlight.

[0041] The above description is based on the ideal embodiment of the utility model. Through the above description, relevant staff can make various changes and modifications without deviating from the technical concept of the utility model. The technical scope of the utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An optical system for a car headlight, characterized in that: include: A primary optical system (1), a cutoff line unit (2), a refractive surface (3), and an imaging system (4) are sequentially arranged along the propagation direction of the optical path; The primary optical system (1) is used to converge the light emitted by the light source at a focus F, the cutoff line unit (2) is used to realize the cutoff line shape of the final light type, and the imaging system (4) is used to image the light distribution at the focus F in two mutually perpendicular directions.

2. The optical system for a vehicle headlight according to claim 1, characterized in that: The primary optical system (1) is a condenser or a reflector.

3. The optical system for a vehicle headlight according to claim 1, characterized in that: The cut-off line unit (2) is a surface having a cut-off line shape, and the cut-off line shape is a straight line or an inverted trapezoid.

4. The optical system for a vehicle headlight according to claim 1, characterized in that: The surface of the cut-off line unit (2) is plated with aluminum.

5. The optical system for a vehicle headlight according to claim 1, characterized in that: The imaging system (4) comprises: A first imaging unit (5) and a second imaging unit (6), wherein the contour line of the first imaging unit (5) in a vertical plane is an arc with a focus F as the center, the contour line of the first imaging unit (5) in a horizontal plane has the function of imaging the light distribution in the focus F area, and the contour line of the second imaging unit (6) in a vertical plane has the function of imaging the light distribution in the focus F area.

6. The optical system for a vehicle headlight according to claim 5, characterized in that: The second imaging unit (6) is an optical structure having a refraction or reflection function; Wherein: the second imaging unit (6) comprises: A light incident surface (601) and a light emitting surface (602), wherein contour lines of the light incident surface (601) and the light emitting surface (602) in a horizontal plane are parallel to each other.

7. The optical system for a vehicle headlight according to claim 6, characterized in that: The contour line of the second imaging unit (6) on the horizontal plane is composed of two mutually parallel straight lines or a biconvex curve, and the contour line of the second imaging unit (6) on the vertical plane is any one of plano-convex, convex-planar, and biconvex.

8. The optical system for a vehicle headlight according to claim 5, characterized in that: The contour line of the second imaging unit (6) in the vertical plane is a parabola or a quasi-parabola, and the contour line extends along the normal direction of the vertical plane to form the second imaging unit (6).

9. The optical system for a vehicle headlight according to claim 8, characterized in that: The surface of the second imaging unit (6) is plated with aluminum.

10. The optical system for a vehicle headlight according to claim 1, characterized in that: The primary optical system (1) is disposed at both upper and lower ends of the cut-off line unit (2) on a side away from the refractive surface (3); Wherein: the two primary optical systems (1) are distributed along the vertical direction.

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