Large-aperture zoom projection headlamp module and vehicle lighting system comprising same

Abstract

The large-aperture zoom projection headlamp module comprises eight lenses, the eight lenses are divided into a front fixing set, a zoom set, a compensation set and a rear fixing set in the optical axis direction, the refractive index nd of at least five lenses is larger than or equal to 1.75, the Abbe number vd of at least five lenses is larger than or equal to 40, and the refractive index nd of at least five lenses is larger than or equal to 1.75. The focal length f1 of the front fixed group, the focal length f2 of the zoom group, the focal length f3 of the compensation group, the focal length f4 of the rear fixed group and the total focal length F of the system meet the following relations: 1.8 lt; f1 / f2lt; 3.5); 1lt; f2 / Flt; 3; 0.5 lt; f3 / f2lt; 2; 0.2 lt; f4 / f2lt; 1. The projection lens group can be well adapted to a Micro light source technology, a large aperture technology and a high definition technology of the projection lens group are simultaneously broken through by using a small number of lenses, and in the whole zooming process, the optical distortion is less than or equal to 7%; and a vertical axis color difference value delta f1 is less than or equal to 0.035 mm, and delta f2 is less than or equal to 0.035 mm.

Description

Technical Field

[0001] The present invention relates to the field of optical technology, and in particular to a large-aperture zoom projection headlight module and a vehicle lighting system comprising the same. Background Art

[0002] MicroLED-based projection headlight modules utilize a direct combination of a display-based light source and a projection lens. The microLED light source generates an image through digital drive technology, which is then amplified by the projection lens to create a pattern. This technology boasts a simple structure, high light efficiency, and a cost-effective price. It also enables lighting functions such as low-beam enhancement, high-beam enhancement, adaptive low-beam, adaptive high-beam, and projection display through image changes.

[0003] However, the current design of projection headlight modules still faces the following difficulties: (1) The light distribution generated by the light source is a Lambertian distribution. The light efficiency of the lamp depends on the aperture size of the projection lens group. The requirement of a large aperture increases the design difficulty of the projection lens group; (2) 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 try to balance the design indicators of angle and clarity, and cannot achieve a qualitative breakthrough. Summary of the Invention

[0004] In order to solve the technical problem that the projection headlight module in the prior art cannot simultaneously achieve large aperture, wide angle and high definition indicators, the present invention provides a large aperture zoom projection headlight module and a vehicle lighting system including the same to solve the above problems.

[0005] The present invention provides a large-aperture zoom projection headlight module, comprising eight lenses, which are divided into a front fixed group, a variable magnification group, a compensation group, and a rear fixed group along the optical axis. The refractive index nd of at least five of the lenses is ≥ 1.75, the Abbe number vd of at least five of the lenses is ≥ 40, and the focal length f1 of the front fixed group, the focal length f2 of the variable magnification group, the focal length f3 of the compensation group, the focal length f4 of the rear fixed group, and the total focal length F of the system satisfy the following relationship:

[0006] 1.8<|f1 / f2|<3.5;

[0007] 1<|f2 / F|<3;

[0008] 0.5<|f3 / f2|<2;

[0009] 0.2<|f4 / f2|<1.

[0010] In an optional embodiment of the present invention, the front fixing group and the rear fixing group both satisfy a refractive index nd≥1.75 and an Abbe number vd≥40.

[0011] In an optional embodiment of the present invention, the front fixed group includes one positive lens, and the rear fixed group includes two positive lenses.

[0012] In an optional embodiment of the present invention, the zoom group includes two negative lenses, and the refractive index of the two negative lenses satisfies 1.45≤nd≤1.75 and the Abbe number vd≥40.

[0013] In an optional embodiment of the present invention, the compensation group includes two positive lenses and one negative lens arranged in sequence along the optical axis, and the positive lens is located on one side of the zoom group, wherein the refractive index Nd of the positive lens is ≥1.75, and the Abbe number Vd is ≥40, and the refractive index Nd of the negative lens is ≥1.75, and the Abbe number Vd is ≤30.

[0014] In an optional embodiment of the present invention, the F number of the large aperture zoom projection headlight module is ≤0.7.

[0015] In an optional embodiment of the present invention, the eight lenses are all made of optical glass.

[0016] In an optional embodiment of the present invention, a MicroLED light source is further included, and the pixel pitch of the MicroLED light source is ≤0.05mm.

[0017] The present invention further provides a vehicle lighting system, comprising the large aperture zoom projection headlight module described above, wherein the large aperture zoom projection headlight module is electrically connected to a vehicle control system.

[0018] In an optional embodiment of the present invention, when the vehicle speed is greater than 60 km / h, the system switches to telephoto mode, and the total focal length F of the system is 28mm≤F≤40mm; when the vehicle speed is ≤60 km / h, the system switches to short-focus mode, and the total focal length F of the system is 15mm≤F≤25mm.

[0019] In an optional embodiment of the present invention, when the system is in the telephoto mode, the total focal length of the system is F=32 mm; when the system is in the short-focus mode, the total focal length of the system is F=22 mm.

[0020] The beneficial effects of the present invention are:

[0021] (1) The present invention is well adapted to MicroLED light source technology, utilizes a relatively small number of lenses, and simultaneously achieves a major breakthrough in both the large aperture technology and high-definition technology of the projection lens group. The following conditions are met throughout the zoom range: optical distortion ≤ 7%; vertical axis chromatic aberration value |Δf1| ≤ 0.035 mm, |Δf2| ≤ 0.035 mm.

[0022] (2) The present invention corrects aberrations by rationally matching the positive and negative focal lengths of eight lenses, and reduces chromatic aberration by selecting high refractive index and low dispersion glass materials in the design. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below with reference to the accompanying drawings and examples.

[0024] Figure 1 This is a schematic diagram of the large aperture zoom projection headlight module and the beam path of the present invention;

[0025] Figure 2 This is a vertical axis chromatic aberration diagram of the large aperture zoom projection headlight module described in Example 1 when in telephoto mode;

[0026] Figure 3 This is a relative illumination diagram of the large aperture zoom projection headlight module described in Example 1 when it is in telephoto mode;

[0027] Figure 4 This is an MTF diagram of the large aperture zoom projection headlight module described in Example 1 when in telephoto mode;

[0028] Figure 5 This is a distortion diagram of the large aperture zoom projection headlight module described in Example 1 when it is in telephoto mode;

[0029] Figure 6 This is a vertical axis chromatic aberration diagram of the large aperture zoom projection headlight module described in Example 1 when in short-focus mode;

[0030] Figure 7 This is a relative illumination diagram of the large aperture zoom projection headlight module described in Example 1 when it is in short-focus mode;

[0031] Figure 8 This is an MTF diagram of the large aperture zoom projection headlight module described in Example 1 when in short-focus mode;

[0032] Figure 9 This is a distortion diagram of the large aperture zoom projection headlight module described in Example 1 when it is in short-focus mode.

[0033] In the figure, 1, lens one, 2, lens two, 3, lens three, 4, lens four, 5, lens five, 6, lens six, 7, lens seven, 8, lens eight, 9, image plane, 10, front fixed group, 11, zoom group, 12, compensation group, 13, rear fixed group. DETAILED DESCRIPTION

[0034] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0035] A large-aperture zoom projection headlight module includes eight lenses, which are divided into a front fixed group 10, a zoom group 11, a compensation group 12, and a rear fixed group 13 along the optical axis. The refractive index nd of at least five of the lenses is ≥ 1.75, the Abbe number vd of at least five of the lenses is ≥ 40, and the focal length f1 of the front fixed group 10, the focal length f2 of the zoom group 11, the focal length f3 of the compensation group 12, the focal length f4 of the rear fixed group 13, and the total focal length F of the system satisfy the following relationship:

[0036] 1.8<|f1 / f2|<3.5; 1<|f2 / F|<3; 0.5<|f3 / f2|<2; 0.2<|f4 / f2|<1.

[0037] Front fixed group 10 and rear fixed group 13 are fixed lenses, while zoom group 11 and compensating group 12 are movable lenses. Zooming is achieved through the movement of zoom group 11 and compensating group 12. All eight lenses are spherical lenses. High-refractive-index materials with a refractive index nd ≥ 1.75 are used to reduce spherical aberration, and low-dispersion glass with an Abbe number vd ≥ 40 is used to reduce system chromatic aberration.

[0038] By defining the relationship between the number of lenses and the number of focal lengths, the compensation group 12 becomes the main focal length component of the system and effectively eliminates the residual chromatic aberration of the system. Among them, the quantitative relationship between the focal length f3 of the compensation group 12 and the focal length f2 of the zoom group 11 can make the zoom curve smooth and the aberration stable during the zooming process.

[0039] In a preferred embodiment, the front fixing group 10 and the rear fixing group 13 both satisfy the refractive index nd≥1.75 and the Abbe number vd≥40.

[0040] The front fixed group 10 can be a positive lens with a refractive index nd≥1.75 and an Abbe number vd≥40. The use of this material can effectively reduce the spherical aberration and chromatic aberration of the system.

[0041] The rear fixed group 13 can be two positive lenses with a refractive index nd≥1.75 and an Abbe number vd≥40. The use of this material can effectively reduce the spherical aberration and chromatic aberration of the system, and the curved direction of the lens surface of the rear fixed group 13 is toward the image plane 9, which can correct the field curvature distortion of the system.

[0042] The zoom group 11 includes two negative lenses, the refractive index of the two negative lenses satisfying 1.45≤nd≤1.75 and the Abbe number vd≥40. Low dispersion glass is used to reduce the amount of chromatic aberration during zooming, thereby ensuring stable image quality throughout the zooming process.

[0043] Compensation group 12 consists of two positive lenses and one negative lens arranged along the optical axis. The positive lens is located on the side of zoom group 11. The positive lens has a refractive index Nd ≥ 1.75 and an Abbe number Vd ≥ 40, while the negative lens has a refractive index Nd ≥ 1.75 and an Abbe number Vd ≤ 30. This material combination contributes the majority of the focal length component to the system and eliminates residual chromatic aberration.

[0044] The large-aperture zoom projection headlight module of the present invention can achieve excellent light collection even when its F-number is ≤0.7. The F-number is the ratio of the system's total focal length to the diameter of lens 1. A smaller F-number indicates a larger lens aperture. A larger aperture can cover a larger area of ​​the MicroLED light source, allowing for greater brightness and more pixels to be concentrated on image plane 9. When the pixel pitch of the MicroLED light source is ≤0.05mm, it can be combined with the large-aperture zoom projection headlight module of the present invention to achieve image projection of ≥10,000 pixels.

[0045] Example 1

[0046] like Figure 1 As shown, a large aperture zoom projection headlight module includes a MicroLED light source, lens 1 1, lens 2 2, lens 3 3, lens 4 4, lens 5 5, lens 6 6, lens 7 7 and lens 8 8 in sequence along the optical axis. The light emitted by the MicroLED light source passes through lens 1 1, lens 2 2, lens 3 3, lens 4 4, lens 5 5, lens 6 6, lens 7 7 and lens 8 8 in sequence and is collected on the image plane 9.

[0047] Lens 1 (1) is a fixed positive lens, forming the front fixed group (10). Lens 2 (2) and lens 3 (3) are both negative lenses, forming the zoom group (11). Lens 4 (4) and lens 5 (5) are positive lenses, while lens 6 (6) is a negative lens. These three lenses form the compensation group (12). Lens 7 (7) and lens 8 (8) are positive lenses, forming the rear fixed group (13).

[0048] The surface parameters of the eight lenses are shown in Table 1:

[0049]

[0050]

[0051] The thickness value corresponding to surface number S1 refers to the thickness of lens 1, while the thickness value for surface number S2 is the distance between lens 1 and its adjacent lens, that is, the distance between S2 and S3. Similarly, the thickness values ​​corresponding to surface numbers S3, S5, S7, S9, S11, S13, and S15 also represent the thickness of their corresponding lenses. The thickness values ​​for surface numbers S4, S6, S8, S10, S12, S14, and S16 represent the distance between their corresponding lenses and their adjacent lenses. Furthermore, surface numbers S2, S6, and S12 each have three thickness values, each corresponding to a different focal length, reflecting the gradual change in the distance between adjacent lenses during focusing. The table shows that the total focal length of the system gradually increases as the thickness values ​​change, switching from short-focus mode to long-focus mode.

[0052] The pixel pitch of the MicroLED light source used in this embodiment is ≤0.05mm, and the light effect structure simulated by the telephoto mode is as follows: Figure 2-Figure 5 As shown, the light effect structure simulated by the short-focus mode is as follows Figure 6-Figure 9 As shown, from Figure 2 and Figure 6 It can be seen that the chromatic aberration of the two wavelengths of light within the full field of view in telephoto mode does not exceed 20 μm, and the chromatic aberration of the two wavelengths of light within the full field of view in short-focus mode does not exceed 70 μm. The system can effectively control the chromatic aberration. Figure 3 and Figure 7 It can be seen that in both telephoto mode and short-focus mode, the relative illumination of the edge field of view is higher than 60%, and the overall illumination uniformity of the system is effectively improved. Figure 4 and Figure 8 It can be seen that in both telephoto mode and short-focus mode, the MTF value reaches above 0.3 within 70% of the field of view, which can achieve a clear projection effect. Figure 5 and Figure 9 It can be seen that the maximum distortion in telephoto mode is less than 1%, and the maximum distortion in short-focus mode is less than 7%. The field curvature distortion of the system is well controlled.

[0053] In summary, the large aperture zoom projection headlight module described in the present invention only requires eight lenses, with an F number ≤ 0.7, and meets the following requirements throughout the zoom range: optical distortion ≤ 6%; vertical axis chromatic aberration |Δf1| ≤ 0.035mm, |Δf2| ≤ 0.035mm (Δf1 represents the vertical axis chromatic aberration value between the wavelength of 460nm and 530nm, and Δf2 represents the vertical axis chromatic aberration value between the wavelength of 620nm and 530nm).

[0054] Example 2

[0055] A vehicle lighting system includes the large aperture zoom projection headlight module described above, which is electrically connected to a vehicle control system and dynamically adjusts the zoom ratio and projection content according to vehicle speed, ambient light, or navigation signals.

[0056] In a preferred embodiment, when the vehicle speed is greater than 60 km / h, the system switches to the telephoto mode, and the total focal length F of the system is 28 mm ≤ F ≤ 40 mm; when the vehicle speed is less than or equal to 60 km / h, the system switches to the short-focus mode, and the total focal length F of the system is 15 mm ≤ F ≤ 25 mm.

[0057] The vehicle lighting system described in this embodiment has a total focal length F of 32 mm when in the telephoto mode, and a total focal length F of 22 mm when in the short-focus mode.

[0058] In this specification, the schematic representations of the terms do not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments.

[0059] With the above-described preferred embodiments of the present invention as a guide, and with reference to the above description, relevant personnel are fully capable of making various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the contents of the specification and must be determined according to the scope of the claims.

Claims

1. A large aperture zoom projection headlight module, characterized by: The system comprises eight lenses, which are divided into a front fixed group, a zoom group, a compensation group, and a rear fixed group along the optical axis. The refractive index nd of at least five of the lenses is ≥ 1.75, the Abbe number vd of at least five of the lenses is ≥ 40, and the focal length f1 of the front fixed group, the focal length f2 of the zoom group, the focal length f3 of the compensation group, the focal length f4 of the rear fixed group, and the total focal length F of the system satisfy the following relationship: 1.8<|f1 / f2|<3.5; 1<|f2 / F|<3; 0.5<|f3 / f2|<2; 0.2<|f4 / f2|<1.

2. The large aperture zoom projection headlight module according to claim 1, characterized in that: The front fixation group and the back fixation group both satisfy a refractive index nd≥1.75 and an Abbe number vd≥40.

3. The large aperture zoom projection headlight module according to claim 2, characterized in that: The front fixed group includes a positive lens, and the rear fixed group includes two positive lenses.

4. The large aperture zoom projection headlight module according to claim 1, characterized in that: The zoom group includes two negative lenses, and the refractive index of the two negative lenses satisfies 1.45≤nd≤1.75 and the Abbe number vd≥40.

5. The large aperture zoom projection headlight module according to claim 1, characterized in that: The compensation group includes two positive lenses and one negative lens arranged in sequence along the optical axis, and the positive lens is located on one side of the zoom group, wherein the refractive index Nd of the positive lens is greater than or equal to 1.75, and the Abbe number Vd is greater than or equal to 40, and the refractive index Nd of the negative lens is greater than or equal to 1.75, and the Abbe number Vd is less than or equal to 30.

6. The large aperture zoom projection headlight module according to claim 1, characterized in that: The F number of the large aperture zoom projection headlight module is ≤0.

7.

7. The large aperture zoom projection headlight module according to claim 1, characterized in that: It also includes a MicroLED light source, wherein the pixel pitch of the MicroLED light source is ≤0.05mm.

8. A vehicle lighting system, characterized in that: The invention comprises the large aperture zoom projection headlight module according to any one of claims 1 to 7, wherein the large aperture zoom projection headlight module is electrically connected to a vehicle control system.

9. The vehicle lighting system according to claim 8, characterized in that: When the vehicle speed is greater than 60 km / h, the system switches to the telephoto mode, and the total focal length F of the system is 28 mm ≤ F ≤ 40 mm; when the vehicle speed is less than or equal to 60 km / h, the system switches to the short-focus mode, and the total focal length F of the system is 15 mm ≤ F ≤ 25 mm.

10. The vehicle lighting system according to claim 9, characterized in that: When the system is in the telephoto mode, the total focal length of the system is F=32 mm. When the system is in the short-focus mode, the total focal length of the system is F=22 mm.

Images