Projection headlamp module and vehicle lighting system using same

Abstract

The invention discloses a projection headlamp module and a vehicle lighting system using the same, and the projection headlamp module comprises a light source module which comprises a plurality of Micro LED pixel units which can be independently controlled; the projection lens group at least comprises nine spherical lenses which are arranged along the optical axis direction; the number ratio of the positive focal length lenses to the negative focal length lenses in the nine spherical lenses is 5: 4; at least four spherical lenses are high-refractive-index glass lenses with the refractive index nd larger than or equal to 1.8, and at least two spherical lenses are low-dispersion glass lenses with the Abbe number vd larger than or equal to 50. And the F number of the projection lens group is less than or equal to 0.7.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle lamps, and in particular to a projection headlamp module and a vehicle lighting system using the same. Background Art

[0002] MicroLED technology-based projection headlight modules utilize a direct combination of a display light source and a projection lens assembly. The microLED light source can generate an image through digital drive technology, which is then amplified by the projection lens assembly to create a pattern. This technology not only boasts a simple structure, high light efficiency, and a cost-effective price, but also enables lighting functions such as low-beam enhancement, high-beam enhancement, adaptive low-beam, adaptive high-beam, and projection display through image changes. However, the light distribution generated by the light source is a Lambertian distribution, and the lighting efficiency of the lamp depends on the aperture size of the projection lens assembly. The requirement for a large aperture increases the design difficulty of the projection lens assembly.

[0003] In addition, the projection headlight module needs to be compatible with lighting and projection functions. The large-angle technical requirements required for lighting and the high-definition technical requirements required for projection function are contradictory in design. The current projection lens group can only balance the design indicators of angle and clarity.

[0004] Therefore, in order to solve the problems existing in the projection headlight module used in the prior art, its structure needs to be further optimized to improve the aperture of the projection lens group and the light efficiency of the headlight module, while expanding the field of view of the headlight module and improving the clarity of the headlight module. Summary of the Invention

[0005] The first object of the present invention is to provide a projection headlight module to solve the technical problem of optimizing its light output effect.

[0006] A second object of the present invention is to provide a vehicle lighting system to solve the technical problem of optimizing its light output effect.

[0007] The projection headlight module of the present invention is implemented as follows:

[0008] A projection headlight module, comprising:

[0009] A light source module comprising a plurality of independently controllable MicroLED pixel units;

[0010] A projection lens assembly comprising at least nine spherical lenses arranged along an optical axis; wherein the ratio of positive focal length lenses to negative focal length lenses among the nine spherical lenses is 5:4; wherein at least four of the spherical lenses are high-refractive-index glass lenses having a refractive index nd ≥ 1.8, and at least two of the spherical lenses are low-dispersion glass lenses having an Abbe number vd ≥ 50; and wherein the F-number of the projection lens assembly is ≤ 0.7.

[0011] In an optional embodiment of the present invention, the nine spherical lenses include a first negative focal length lens, a second positive focal length lens, a third negative focal length lens, a fourth negative focal length lens, a fifth positive focal length lens, a sixth positive focal length lens, a seventh negative focal length lens, an eighth positive focal length lens and a ninth positive focal length lens, which are arranged in sequence from the image side to the object side; wherein

[0012] The first negative focal length lens and the second positive focal length lens form a front fixed group;

[0013] The third negative focal length lens and the fourth negative focal length lens form a zoom group;

[0014] The fifth positive focal length lens and the sixth positive focal length lens form a compensation group;

[0015] The seventh negative focal length lens, the eighth positive focal length lens and the ninth positive focal length lens form a rear fixed group.

[0016] In an optional embodiment of the present invention, when the magnification is changed from the short focal length end to the long focal length end, the magnification is changed by reducing the distance between the zoom group and the compensation group.

[0017] In an optional implementation of the present invention, the zoom group and the compensation group are suitable for controlling the relative distance between the two through an asymmetric cam curve to achieve a continuous optical zoom of 1.0 to 1.5 times.

[0018] In an optional implementation of the present invention, the combined focal length f1 of the front fixed lens group and the total focal length F of the projection lens group satisfy: 8<|f1 / F|<12.

[0019] In an optional embodiment of the present invention, the projection lens group satisfies the following conditions during the continuous optical zooming process: optical distortion is no greater than 5%; and

[0020] Vertical axis chromatic aberration |Δf1|≤0.035mm,|Δf2|≤0.035mm;

[0021] Δf1 is the vertical axis chromatic difference between 460nm and 530nm wavelengths, and Δf2 is the vertical axis chromatic difference between 620nm and 530nm wavelengths.

[0022] In an optional embodiment of the present invention, a pixel pitch between the plurality of independently controllable MicroLED pixel units is no greater than 0.05 mm; and

[0023] The light source module cooperates with the projection lens group to realize image projection of no less than 10,000 pixels.

[0024] In an optional implementation of the present invention, the output luminous flux of the light source module is not less than 2000 lm.

[0025] The vehicle lighting system of the present invention is achieved as follows:

[0026] A vehicle lighting system, comprising: an onboard controller, and the projection headlight module connected to the onboard controller; and

[0027] The vehicle-mounted controller is suitable for dynamically adjusting the zoom ratio of the projection headlight module according to the vehicle speed.

[0028] In an optional embodiment of the present invention, when the vehicle speed is greater than 60 km / h, the projection headlight module is adjusted to a long focal length mode;

[0029] When the vehicle speed is not greater than 60 km / h, the projection headlight module is adjusted to a short focal length mode.

[0030] By adopting the above technical solution, the present invention has the following beneficial effects: the projection headlight module of the present invention corrects aberrations by rationally matching the positive and negative focal lengths of nine spherical glass lenses, and reduces chromatic aberration by selecting high-refractive-index and low-refractive-index glass materials in the design. It can be well adapted to Microled light source technology to achieve the module advantage of high light efficiency.

[0031] In addition, the projection lens group is divided into a front fixed group, a zoom group, a compensation group and a rear fixed group. When the magnification is changed from the short focal length end to the long focal length end, the magnification is changed by reducing the distance between the zoom group and the compensation group. During the entire zoom process, the projection headlight module can maintain a clear imaging effect, realizing the high-brightness lighting and clear projection functions of the headlight module. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the structure of the projection headlight module in long focal length mode;

[0033] Figure 2 This is a vertical axis chromatic aberration diagram of the projection headlight module in long focal length mode;

[0034] Figure 3 This is the relative illumination diagram of the projection headlight module in long focal length mode;

[0035] Figure 4 This is the MTF diagram of the projection headlight module in long focal length mode;

[0036] Figure 5 This is the distortion diagram of the projection headlight module in long focal length mode;

[0037] Figure 6 This is a schematic diagram of the structure of the projection headlight module in short focal length mode;

[0038] Figure 7This is a vertical axis chromatic aberration diagram of the projection headlight module in short focal length mode;

[0039] Figure 8 This is the relative illumination diagram of the projection headlight module in short focal length mode;

[0040] Figure 9 This is the MTF diagram of the projection headlight module in short focal length mode;

[0041] Figure 10 This is a distortion diagram of the projection headlight module in short focal length mode.

[0042] In the figure: first negative focal length lens L1, second positive focal length lens L2, third negative focal length lens L3, fourth negative focal length lens L4, fifth positive focal length lens L5, sixth positive focal length lens L6, seventh negative focal length lens L7, eighth positive focal length lens L8, and ninth positive focal length lens L9. DETAILED DESCRIPTION

[0043] 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.

[0044] Example 1:

[0045] See also Figures 1 to 5 As shown, this embodiment provides a projection headlight module, including: a light source module and a projection lens group used in conjunction with each other.

[0046] First, the light source module includes multiple independently controllable MicroLED pixel units; the light source module has an output luminous flux of no less than 2000 lumens; the pixel pitch of the multiple independently controllable MicroLED pixel units is no greater than 0.05 mm; and the light source module cooperates with the projection lens assembly to achieve an image projection of no less than 10,000 pixels.

[0047] Next, the projection lens assembly includes at least nine spherical lenses arranged along the optical axis. This embodiment, illustrated with reference to the accompanying drawings, uses nine spherical lenses as an example. It should be noted that the ratio of positive focal length lenses to negative focal length lenses in the nine spherical lenses is 5:4; at least four of the spherical lenses are high-refractive-index glass lenses with a refractive index nd ≥ 1.8, and at least two of the spherical lenses are low-dispersion glass lenses with an Abbe number vd ≥ 50; and the F-number of the projection lens assembly is ≤ 0.7.

[0048] More specifically, the nine spherical lenses include, arranged from image side to object side, a first negative focal length lens L1, a second positive focal length lens L2, a third negative focal length lens L3, a fourth negative focal length lens L4, a fifth positive focal length lens L5, a sixth positive focal length lens L6, a seventh negative focal length lens L7, an eighth positive focal length lens L8, and a ninth positive focal length lens L9. The first negative focal length lens L1 and the second positive focal length lens L2 form a front fixed group; the third negative focal length lens L3 and the fourth negative focal length lens L4 form a zoom group; the fifth positive focal length lens L5 and the sixth positive focal length lens L6 form a compensation group; and the seventh negative focal length lens L7, the eighth positive focal length lens L8, and the ninth positive focal length lens L9 form a rear fixed group. The a-plane of the ninth positive focal length lens L9, facing away from the first negative focal length lens L1, serves as the focal plane of the projection lens group, and the MicroLED light source is positioned on this a-plane.

[0049] In addition, it should be noted that, from the image side to the object side, S1 of the first negative focal length lens L1 is convex, and S2 is concave; S3 and S4 of the second positive focal length lens L2 are both convex; S5 and S6 of the third negative focal length lens L3 are both concave; S7 and S8 of the fourth negative focal length lens L4 are both concave; S9 and S10 of the fifth positive focal length lens L5 are both convex; S11 of the sixth positive focal length lens L6 is convex, and S12 is concave; S13 and S14 of the seventh negative focal length lens L7 are both concave; S15 and S16 of the eighth positive focal length lens L8 are both convex; S17 of the ninth positive focal length lens L9 is convex, and S18 is concave.

[0050] When changing magnification from the short focal length to the long focal length, the magnification change is achieved by reducing the spacing between the zoom group and the compensation group. In one optional implementation, the zoom group and the compensation group are adapted to achieve a continuous optical zoom of 1.0x to 1.5x by controlling the relative spacing between them using an asymmetric cam curve. The asymmetric cam curve control method herein can optionally employ established methods in the prior art, and this embodiment does not impose an absolute limitation thereto.

[0051] Furthermore, it should be noted that the combined focal length f1 of the front fixed lens group and the total focal length F of the projection lens group satisfy the following conditions: 8 < |f1 / F| < 12. Furthermore, during continuous optical zooming, the projection lens group meets the following conditions: optical distortion is no greater than 5%, and vertical chromatic aberration |Δf1| ≤ 0.035mm, |Δf2| ≤ 0.035mm. Δf1 is the vertical chromatic aberration between 460nm and 530nm wavelengths, and Δf2 is the vertical chromatic aberration between 620nm and 530nm wavelengths.

[0052] Next, taking a specific optional projection headlight module in long focal length mode as an example, the surface parameters (unit: mm) of the projection lens group used therein are as follows:

[0053]

[0054]

[0055] Based on the above situation, Figure 1 This is a schematic diagram of the structure of the projection headlight module in long focal length mode; Figure 2 This is a vertical chromatic aberration diagram of the projection headlight module in long focal length mode. The diagram shows how the vertical chromatic aberration changes with the actual image height. The horizontal axis is the vertical chromatic aberration value, and the vertical axis is the actual image height value. Figure 3 This is a relative illumination diagram of the projection headlight module in long focal length mode. The figure shows the ratio of off-axis field illumination to on-axis field illumination under different fields of view. The horizontal axis is the actual image height value, and the vertical axis is the relative illumination value (the relative illumination value represents the ratio of off-axis field illumination to on-axis field illumination); Figure 4 This is the MTF diagram of the projection headlight module in long focal length mode. The figure shows the MTF values in the sagittal and meridional directions of different fields of view at 6.25lp / mm. The abscissa is the actual image height value, and the ordinate is the OTF modulus value (MTF value). S1 represents the sagittal direction, and T1 represents the meridional direction. Figure 5 This is a distortion diagram of a projector headlight module in long-focus mode. The diagram shows how optical distortion varies under different fields of view, with the horizontal axis representing the distortion value and the vertical axis representing the field of view angle. The accompanying diagram demonstrates that the projector headlight module of this embodiment can expand the field of view angle and improve the clarity of the headlight module.

[0056] Example 2:

[0057] See also Figures 6 to 10 As shown, based on the projection headlight module of Example 1, this embodiment provides an example of a projection headlight module. For example, for a specific optional projection headlight module in a short focal length mode, the surface parameters (unit: mm) of the projection lens group used therein are as follows:

[0058]

[0059]

[0060] Based on the above situation, Figure 6 This is a schematic diagram of the structure of the projection headlight module in short focal length mode; Figure 7 This is a vertical chromatic aberration diagram of the projection headlight module in short focal length mode. The diagram shows how the vertical chromatic aberration changes with the actual image height. The horizontal axis is the vertical chromatic aberration value, and the vertical axis is the actual image height value. Figure 8This is a relative illumination diagram of the projection headlight module in short focal length mode. The figure shows the ratio of off-axis field illumination to on-axis field illumination at different fields of view. The horizontal axis is the actual image height value, and the vertical axis is the relative illumination value (the relative illumination value represents the ratio of off-axis field illumination to on-axis field illumination); Figure 9 This is the MTF diagram of the projection headlight module in short focal length mode. The figure shows the MTF values in the sagittal and meridional directions of different fields of view at 6.25lp / mm. The abscissa is the actual image height value, and the ordinate is the OTF modulus value (MTF value). S1 represents the sagittal direction, and T1 represents the meridional direction. Figure 10 This is a distortion diagram of a projector headlight module in short-focus mode. The diagram shows how optical distortion varies across different fields of view, with the horizontal axis representing the distortion value and the vertical axis representing the field of view angle. The accompanying diagram demonstrates that the projector headlight module of this embodiment can expand the field of view and improve clarity.

[0061] Example 3:

[0062] Based on the projection headlight module of Example 1 or Example 2, this embodiment provides a vehicle lighting system, including: an on-board controller, and the projection headlight module of Example 1 or Example 2 connected to the on-board controller; and the on-board controller is suitable for dynamically adjusting the zoom ratio of the projection headlight module according to the vehicle speed.

[0063] Specifically, when the vehicle speed is greater than 60km / h, the projection headlight module is adjusted to long focal length mode (22mm focal length); when the vehicle speed is not greater than 60km / h, the projection headlight module is adjusted to short focal length mode (32mm focal length).

[0064] The above specific embodiments further illustrate the objectives, 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.

[0065] 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 used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they cannot be understood as limiting the present invention.

[0066] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or 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 the present invention based on specific circumstances.

[0067] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like indicate positions or locations based on the positions shown in the accompanying drawings, or the positions or locations in which the inventive product is typically placed when in use. These terms are intended solely to facilitate the description of the present invention and to simplify the description, and are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. 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.

[0068] 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.

[0069] 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 projection headlight module, characterized in that: include: A light source module comprising a plurality of independently controllable MicroLED pixel units; A projection lens assembly comprising at least nine spherical lenses arranged along an optical axis; wherein the ratio of positive focal length lenses to negative focal length lenses among the nine spherical lenses is 5:4; wherein at least four of the spherical lenses are high-refractive-index glass lenses having a refractive index nd ≥ 1.8, and at least two of the spherical lenses are low-dispersion glass lenses having an Abbe number vd ≥ 50; and wherein the F-number of the projection lens assembly is ≤ 0.

7.

2. The projection headlight module according to claim 1, characterized in that: The nine spherical lenses include a first negative focal length lens, a second positive focal length lens, a third negative focal length lens, a fourth negative focal length lens, a fifth positive focal length lens, a sixth positive focal length lens, a seventh negative focal length lens, an eighth positive focal length lens and a ninth positive focal length lens, which are arranged in sequence from the image side to the object side; in The first negative focal length lens and the second positive focal length lens form a front fixed group; The third negative focal length lens and the fourth negative focal length lens form a zoom group; The fifth positive focal length lens and the sixth positive focal length lens form a compensation group; The seventh negative focal length lens, the eighth positive focal length lens and the ninth positive focal length lens form a rear fixed group.

3. The projection headlight module according to claim 2, characterized in that: When the magnification is changed from the short focal length end to the long focal length end, the magnification is changed by reducing the distance between the zoom group and the compensation group.

4. The projection headlight module according to claim 3, characterized in that: The zoom group and the compensation group are suitable for controlling the relative distance between the two through an asymmetric cam curve to achieve 1.0 to 1.5 times continuous optical zoom.

5. The projection headlight module according to any one of claims 2 to 4, characterized in that: The combined focal length f1 of the front fixed lens group and the total focal length F of the projection lens group satisfy the following: 8<|f1 / F|<12.

6. The projection headlight module according to claim 5, characterized in that: During the continuous optical zooming process of the projection lens group, the optical distortion is not greater than 5%; and Vertical axis chromatic aberration |Δf1|≤0.035mm,|Δf2|≤0.035mm; Δf1 is the vertical axis chromatic difference between 460nm and 530nm wavelengths, and Δf2 is the vertical axis chromatic difference between 620nm and 530nm wavelengths.

7. The projection headlight module according to any one of claims 1 to 4, characterized in that: The pixel pitch of the plurality of independently controllable MicroLED pixel units is no greater than 0.05 mm; and The light source module cooperates with the projection lens group to realize image projection of no less than 10,000 pixels.

8. The projection headlight module according to claim 1, characterized in that: The output luminous flux of the light source module is not less than 2000 lm.

9. A vehicle lighting system, characterized in that: include: An on-board controller, and a projection headlight module according to any one of claims 1 to 8 connected to the on-board controller; as well as The vehicle-mounted controller is suitable for dynamically adjusting the zoom ratio of the projection headlight module according to the vehicle speed.

10. The vehicle lighting system according to claim 9, characterized in that When the vehicle speed is greater than 60 km / h, the projection headlight module is adjusted to the long focal length mode; When the vehicle speed is not greater than 60 km / h, the projection headlight module is adjusted to a short focal length mode.

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