A projection lamp module for vehicles

Abstract

The application provides a projection lamp module for vehicles, which comprises an illumination module, a projection source and an imaging module. The imaging module comprises a first lens group, an aperture and a second lens group from the object side to the image side. The first lens group comprises a first lens and a second lens from the object side to the image side. The first lens and the second lens are both set as non-rotationally symmetrical lenses. The second lens group comprises a third lens, a fourth lens and a fifth lens from the object side to the image side. The third lens, the fourth lens and the fifth lens are all set as rotationally symmetrical lenses. The application satisfies the following conditions: a) |fx12| / f345>3.0; b) |fx1| / fx2<0.8; c) |fy12| / f345>5; d) |fy1| / |fx1|>10; and e) |fy2| / fx2>4. The application can realize a larger stretching and widening ratio, a wide pattern coverage, a clear imaging effect, a high energy effective utilization and a simple structure.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of projection lamp, in particular to a projection lamp module for vehicle. BACKGROUND

[0002] The projection lamp is also called logo lamp or welcome lamp, which can be used in different fields, such as being used for projection on the outside of the vehicle body to realize the welcome function, or being used for forming corresponding projection effect in front of or behind the vehicle to form warning and reminding effect for pedestrians or vehicles.

[0003] As shown in Figure 1 , the projection lamp generally includes three important components: an illumination unit, a projection source and a projection unit. The illumination unit includes an LED and a collimating lens, the projection source can be a film or a liquid crystal screen, and the projection unit is composed of a plurality of optical lenses to realize the imaging effect of magnifying the pattern of the projection source. The lenses of the projection imaging unit of the ordinary projection lamp are rotationally symmetrical structures, so the projection magnification ratio of the film in the horizontal x direction and the vertical y direction is the same. When the vertical projection is performed, the projection area is a circular spot, as shown in Figure 2a .

[0004] For the ordinary projection lamp, when the projection height and angle are determined, the maximum area of the projection formed is fixed. In order to meet the demand of larger projection area, a plurality of small field of view lenses can be spliced, such as the projection lamp group optical system for expanding the field of view disclosed in the application publication No. CN113566150A, or a lens with a larger field of view is developed. However, on the one hand, a larger field of view lens generally needs more lenses to achieve the same imaging quality, and on the other hand, in the application of inclined projection, the projection lens with a larger field of view may cause energy waste, because the illumination area will be elongated in the vertical direction (i.e. the pitch direction) due to the inclined projection, as shown in Figure 2b . In fact, in the vertical direction or y direction, the illumination area is sufficient, and energy is wasted. If the field of view angle is uniformly increased, the actual effective utilization area will be smaller, and more energy will be wasted.

[0005] In fact, only the light spot needs to be widened in the horizontal direction or x direction, that is, the demand of wide area inclined projection can be met, as shown in Figure 3a and Figure 3bThe picture ratio of a movie is projected from the standard 1.33:1 to an anamorphic scope (2.35:1) by the design of the projection lens, but the stretching ratio is only 1.75 times (i.e. 2.35:1.33). However, the projection machine for a movie is complex in structure and has a large number of lenses due to the high image quality requirement, and on the other hand, the stretching ratio of 1.75 times is far from meeting the requirement of the projection lamp. In view of the above problems existing in the prior art, it is urgent to realize a projection lamp which can meet a larger stretching ratio efficiently and simply. SUMMARY

[0006] In view of the above problems, the present application provides a projection lamp module for a vehicle, which can realize a larger stretching ratio, has a wide pattern coverage range, clear imaging effect, high energy utilization efficiency and simple structure and is easy to realize.

[0007] To achieve the above object, the present application solves the problem by the following technical scheme:

[0008] A projection lamp module for a vehicle, comprising an illumination module, a projection source and an imaging module, the imaging module comprises, in order from the object side to the image side, a first lens group, a diaphragm and a second lens group; the first lens group comprises, in order from the object side to the image side, a first lens and a second lens, and the first lens and the second lens are both set as non-rotationally symmetric lenses; the second lens group comprises, in order from the object side to the image side, a third lens, a fourth lens and a fifth lens, and the third lens, the fourth lens and the fifth lens are all set as rotationally symmetric lenses.

[0009] It satisfies the following conditional formula:

[0010] a) the formula |fx12| / f345>3.0;

[0011] b) the formula |fx1| / fx2<0.8;

[0012] c) the formula |fy12| / f345>5;

[0013] d) the formula |fy1| / |fx1|>10;

[0014] e) the formula |fy2| / fx2>4;

[0015] Wherein, fx12 is the equivalent focal length of the first lens group in the horizontal direction, f345 is the equivalent focal length of the second lens group, fx1 is the equivalent focal length of the first lens in the horizontal direction, fx2 is the equivalent focal length of the second lens in the horizontal direction, fy12 is the equivalent focal length of the first lens group in the vertical direction, fy1 is the equivalent focal length of the first lens in the vertical direction, and fy2 is the equivalent focal length of the second lens in the vertical direction.

[0016] In the horizontal direction, the first lens has negative optical power, the second lens has positive optical power, the third lens has positive optical power, the fourth lens has negative optical power, and the fifth lens has positive optical power.

[0017] As a preferred option, the horizontal field of view is set to A, and the vertical field of view is set to B, where A > 2B.

[0018] As a preferred embodiment, the material of the fourth lens has an Abbe number of less than 30.

[0019] As a preferred embodiment, the materials of the third and fifth lenses have an Abbe number greater than 45.

[0020] As a preferred embodiment, the Abbe number of the materials of the first lens and the second lens is greater than 45.

[0021] As a preferred embodiment, the fourth lens is configured as a biconcave lens.

[0022] As a preferred embodiment, the fifth lens is configured as a biconvex lens.

[0023] As a preferred embodiment, at least one of the two surfaces of the first lens is configured as any one of a tortuous surface, a cylindrical surface, or a tire surface.

[0024] As a preferred embodiment, at least one of the two surfaces of the second lens is configured as any one of a tortuous surface, a cylindrical surface, or a tire surface.

[0025] As a preferred embodiment, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all configured as multi-element combination lenses or multi-element cemented lenses.

[0026] The beneficial effects of this invention are:

[0027] 1. This invention realizes a projection lamp module with a horizontal projection field of view that is widened by more than twice, which has the advantages of simple structure, wide projection range, high energy utilization, and clear pattern. By dividing the lens into a non-rotationally symmetric first lens group and a rotationally symmetric second lens group through the aperture, aberrations can be optimized separately, resulting in a more compact structure and clear function. By setting conditional expressions a) and c), it is shown that the main optical power of the imaging system is provided by the second lens group, and the optical power of the first lens group is relatively small. Expression b) limits and adjusts the horizontal focal length of the first and second lenses, thereby achieving a horizontal beam spread and field of view that is more than twice that of the vertical direction. Expressions d) and e) mainly limit the optical power in the vertical direction, so that the design can have a large horizontal spread and widening ratio while avoiding the introduction of aberrations in the vertical direction.

[0028] 2. The material of the fourth lens has an Abbe number of less than 30, while the materials of the third and fifth lenses have an Abbe number of greater than 45. The materials of the first and second lenses have an Abbe number of greater than 45, which can achieve better color performance and reduce chromatic aberration.

[0029] 3. Even with lenses of the same optical power, different lens shapes can lead to different levels of sharpness and distortion. In this invention, the fourth lens is set as a biconcave lens and the fifth lens is set as a biconvex lens, resulting in clear imaging and less distortion.

[0030] 4. At least one of the two surfaces of the first lens and the second lens is set as any one of the following: toric surface, cylindrical surface, and toroidal surface. The first lens and the second lens have different optical powers in the horizontal and vertical directions. Therefore, each lens has at least one asymmetrical surface, such as toric surface, cylindrical surface, or toroidal surface, so as to achieve the difference in optical power in the horizontal and vertical directions. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of a projection lamp in the prior art.

[0032] Figure 2a This is a schematic diagram of a circular spot projected during vertical projection in the prior art.

[0033] Figure 2b This is a schematic diagram of the light spot when a projector lamp is tilted during projection in the prior art.

[0034] Figure 3a This is a schematic diagram of the light spot of the projection lamp of the present invention (the horizontal X direction is greatly stretched and widened).

[0035] Figure 3b This is a schematic diagram of the light spot when the projection lamp of the present invention is tilted during projection.

[0036] Figure 4a This is a schematic diagram (horizontal direction) of the imaging module structure according to the first embodiment of the present invention.

[0037] Figure 4b This is a schematic diagram (vertical direction) of the imaging module structure according to the first embodiment of the present invention.

[0038] Figure 4c This is a dot diagram of the first embodiment of the present invention.

[0039] Figure 5a This is a schematic diagram (horizontal direction) of the imaging module structure according to the second embodiment of the present invention.

[0040] Figure 5b This is a schematic diagram (vertical direction) of the imaging module structure according to the second embodiment of the present invention.

[0041] Figure 5cThis is a dot diagram of the second embodiment of the present invention.

[0042] Figure 6a This is a schematic diagram (horizontal direction) of the imaging module structure according to the third embodiment of the present invention.

[0043] Figure 6b This is a schematic diagram (vertical direction) of the imaging module structure according to the third embodiment of the present invention.

[0044] Figure 6c This is a dot diagram of the third embodiment of the present invention.

[0045] The attached figures are labeled as follows: aperture 10, first lens 11, second lens 12, third lens 13, fourth lens 14, fifth lens 15, first lens group 17, and second lens group 18. Detailed Implementation

[0046] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the implementation of the present invention is not limited thereto.

[0047] A vehicle projection lamp module includes an illumination module, a projection source, and an imaging module. The imaging module includes a first lens group 17, an aperture 10, and a second lens group 18 sequentially from the object side to the image side 16. The first lens group 17 includes a first lens 11 and a second lens 12 sequentially from the object side to the image side, and both the first lens 11 and the second lens 12 are configured as non-rotationally symmetric lenses. The second lens group 18 includes a third lens 13, a fourth lens 14, and a fifth lens 15 sequentially from the object side to the image side, and all three lenses are configured as rotationally symmetric lenses.

[0048] It meets the following conditional expression:

[0049] Equation a), |fx12| / f345>3.0;

[0050] In equation b), |fx1| / fx2 < 0.8;

[0051] c) Equation, |fy12| / f345>5;

[0052] Equation d), |fy1| / |fx1|>10;

[0053] e) Equation: |fy2| / fx2>4;

[0054] Wherein, fx12 is the equivalent focal length of the first lens group 17 in the horizontal direction, f345 is the equivalent focal length of the second lens group 18, fx1 is the equivalent focal length of the first lens 11 in the horizontal direction, fx2 is the equivalent focal length of the second lens 12 in the horizontal direction, fy12 is the equivalent focal length of the first lens group 17 in the vertical direction, fy1 is the equivalent focal length of the first lens 11 in the vertical direction, and fy2 is the equivalent focal length of the second lens 12 in the vertical direction; in the horizontal direction, the first lens 11 has negative optical power, the second lens 12 has positive optical power, the third lens 13 has positive optical power, the fourth lens 14 has negative optical power, and the fifth lens 15 has positive optical power.

[0055] This invention realizes a projection lamp module whose horizontal projection field of view is widened by more than 2 times, which has the advantages of simple structure, wide projection range, high energy utilization and clear pattern; by dividing the lens into a non-rotationally symmetric first lens group and a rotationally symmetric second lens group through the aperture, aberrations can be optimized separately, the structure is more compact and the function is clear.

[0056] By setting conditions a) and c), it is shown that the main optical power of the imaging system is provided by the second lens group, while the optical power of the first lens group is relatively small.

[0057] Formula b) limits and adjusts the horizontal focal length of the first and second lenses, thereby achieving a horizontal stretching and widening of the light spot and field of view that is more than twice that of the vertical direction.

[0058] Formulas d) and e) mainly limit the optical power in the vertical direction, so that the design can have a large stretch-width ratio in the horizontal direction, while avoiding the introduction of aberrations in the vertical direction.

[0059] The horizontal field of view is set to A, and the vertical field of view is set to B, where A > 2B. This is achieved by adjusting the optical power of the first and second lenses in the first lens group 17 in the horizontal direction.

[0060] The material of the fourth lens 14 has an Abbe number of less than 30; the materials of the third lens 13 and the fifth lens 15 have an Abbe number of greater than 45; and the materials of the first lens 11 and the second lens 12 have an Abbe number of greater than 45. This arrangement achieves better color performance and reduces chromatic aberration.

[0061] Even with lenses of the same optical power, different lens shapes can lead to different levels of sharpness and distortion. In this invention, the fourth lens is set as a biconcave lens and the fifth lens is set as a biconvex lens, resulting in clear imaging and minimal distortion.

[0062] At least one of the two surfaces of the first lens 11 and the second lens 12 is configured as a toric surface, cylindrical surface, or toroidal surface. The first lens and the second lens have different optical powers in the horizontal and vertical directions, so each lens has at least one asymmetrical surface, such as a toric surface, cylindrical surface, or toroidal surface, in order to achieve the difference in optical power in the horizontal and vertical directions.

[0063] As a preferred embodiment, the first lens 11, the second lens 12, the third lens 13, the fourth lens 14, and the fifth lens 15 are all configured as multi-element combination lenses or multi-element cemented lenses, thereby providing more color performance.

[0064] For the first implementation method, please refer to [link / reference]. Figures 4a-4c In this embodiment, the horizontal field of view is widened by 2.7 times. Table 1 below shows the basic parameters of this embodiment. The L1a-L2b surfaces of the first lens group 17 are all complex surfaces, and the L3a-L5b surfaces of the second lens group 18 are all aspherical surfaces of revolution. Tables 2 and 3 show the coefficients of the relevant surface shapes.

[0065] Table 1

[0066]

[0067] Table 2

[0068] Surface No. Kx Ky L1a -15.6226 0.0000 L1b 1.9499 0.0000 L2a -24.3776 0.0000 L2b -1.1893 -4.5770

[0069] Table 3

[0070]

[0071] The expression for a complex surface is as follows:

[0072]

[0073] Where z is the sag at x and y, CUX is the reciprocal of the radius of curvature in the x direction, CUY is the reciprocal of the radius of curvature in the y direction, Kx is the conic coefficient in the x direction, and Ky is the conic coefficient in the y direction.

[0074] The expression for an aspherical surface is as follows:

[0075]

[0076] Where z is the sag of the aspherical surface at position r; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the surface curvature radius R); k is the conic coefficient; A, B, ..., J are coefficients of higher-order terms.

[0077] Other system parameters for the first embodiment are as follows:

[0078] Table 4

[0079] Parameter xFov(°) yFov(°) fx12(mm) fy12((mm) fx1(mm) fy1(mm) fx2(mm) fy2(mm) f345(mm) Value 70 26 110.47 69.08 -9.64 -183.11 14.39 70.95 9.28

[0080] The relationship that satisfies:

[0081] Table 5

[0082] Constraint Design Result |fx12| / f345 > 3.0 |fx12| / f345 = 11.9, which is satisfied |fx1| / fx2<0.8 |fx1| / fx2 = 0.66, which is satisfied |fy12| / f345 > 5 |fy12| / f345 = 7.44, which is satisfied |fy1| / |fx1| > 10 |fy1| / |fx1| = 18.9, which is satisfied |fy2| / fx2 > 4 |fy2| / fx2 = 4.93, which is satisfied xFOV > 2*yFOV xFOV / yFOV = 2.69, which is satisfied

[0083] The data shows that the horizontal field of view (FOV) of the lens has been widened by 2.69 times, thus greatly improving the projection range.

[0084] For the second implementation method, please refer to [link / reference]. Figures 5a-5c In this embodiment, the horizontal field of view is widened by a factor of 3. Table 6 below shows the basic parameters of this embodiment. The L1b surface of the first lens group 17 is a plane, and the surface shapes of L1a, L2a, and L2b are all complex surfaces. However, since the Y direction is a plane, the surface shape degenerates into a cylindrical surface. The L3a-L5b surfaces of the second lens group 18 are all aspherical surfaces of revolution. Tables 7 and 8 show the coefficients of the relevant surface shapes.

[0085] Table 6

[0086]

[0087] Table 7

[0088] Surface No. Kx Ky L1a -1.7535 0.0000 L2a 10.6934 0.0000 L2b -39.3389 0.0000

[0089] Table 8

[0090]

[0091] Other system parameters for the second embodiment are as follows:

[0092] Table 9

[0093] Parameter xFov(°) yFov(°) fx12(mm) fy12((mm) fx1(mm) fy1(mm) fx2(mm) fy2(mm) f345(mm) Value 66 22 -8418.72 Infinite -13.04 Infinite 21.78 Infinite 8.93

[0094] Satisfying Relationships

[0095] Table 10

[0096] Constraint Design Result |fx12| / f345 > 3.0 |fx12| / f345 = 942, which is satisfied |fx1| / fx2<0.8 |fx1| / fx2 = 0.59, which is satisfied |fy12| / f345 > 5 |fy12| / f345 = Infinite, which is satisfied |fy1| / |fx1| > 10 |fy1| / |fx1| = Infinite, which is satisfied |fy2| / fx2 > 4 |fy2| / fx2 = Infinite, which is satisfied xFOV > 2*yFOV xFOV / yFOV = 3, which is satisfied

[0097] As the data shows, the horizontal field of view (FOV) of the lens has been widened by 3 times, thus greatly increasing the projection range.

[0098] For the third implementation method, please refer to [link / reference]. Figures 6a-6cIn this embodiment, the horizontal field of view is widened by 3.5 times. Table 11 below shows the basic parameters of this embodiment. The L1b surface of the first lens group 17 is a plane, and the surface shapes of L1a, L2a, and L2b are all complex surfaces. However, since the Y direction is a plane, the surface shape degenerates into a cylindrical surface. The L3a-L5b surfaces of the second lens group 18 are all aspherical surfaces of revolution. Tables 12 and 13 show the coefficients of the relevant surface shapes.

[0099] Table 11

[0100]

[0101] Table 12

[0102] Surface No. Kx Ky L1a 4.6915 0.0000 L1b -0.5410 0.0000 L2a -309.8390 0.0000 L2b -0.7337 -17.5287

[0103] Table 13

[0104]

[0105] Other system parameters for this implementation are:

[0106] Table 14

[0107] Parameter xFov(°) yFov(°) fx12(mm) fy12((mm) fx1(mm) fy1(mm) fx2(mm) fy2(mm) f345(mm) Value 70 20 23.21 69.08 -2.81 257.28 7.29 91.91 6.54

[0108] Satisfying Relationships

[0109] Table 15

[0110] Constraint Design Result |fx12| / f345 > 3.0 |fx12| / f345 = 3.54, which is satisfied |fx1| / fx2<0.8 |fx1| / fx2 = 0.38, which is satisfied |fy12| / f345 > 5 |fy12| / f345 = 10.5, which is satisfied |fy1| / |fx1| > 10 |fy1| / |fx1| = 91.4, which is satisfied |fy2| / fx2 > 4 |fy2| / fx2 = 12.6, which is satisfied xFOV > 2*yFOV xFOV / yFOV = 3.5, which is satisfied

[0111] The data shows that the horizontal field of view (FOV) of the lens has been stretched and widened by 3.5 times, thus greatly improving the projection range.

[0112] The above embodiments only illustrate three implementation methods of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A vehicle projection lamp module, comprising a lighting module, a projection source, and an imaging module, characterized in that, The imaging module comprises, from the object side to the image side (16), a first lens group (17), an aperture stop (10), and a second lens group (18); the first lens group (17) comprises, from the object side to the image side, a first lens (11) and a second lens (12), both of which are non-rotationally symmetric lenses; the second lens group (18) comprises, from the object side to the image side, a third lens (13), a fourth lens (14), and a fifth lens (15), all of which are rotationally symmetric lenses; It meets the following conditional expression: Equation a), |fx12| / f345>3.0; In equation b), |fx1| / fx2 < 0.8; c) Equation, |fy12| / f345>5; Equation d), |fy1| / |fx1|>10; e) Equation: |fy2| / fx2>4; Wherein, fx12 is the equivalent focal length of the first lens group (17) in the horizontal direction, f345 is the equivalent focal length of the second lens group (18), fx1 is the equivalent focal length of the first lens (11) in the horizontal direction, fx2 is the equivalent focal length of the second lens (12) in the horizontal direction, fy12 is the equivalent focal length of the first lens group (17) in the vertical direction, fy1 is the equivalent focal length of the first lens (11) in the vertical direction, and fy2 is the equivalent focal length of the second lens (12) in the vertical direction. In the horizontal direction, the first lens (11) has negative optical power, the second lens (12) has positive optical power, the third lens (13) has positive optical power, the fourth lens (14) has negative optical power, and the fifth lens (15) has positive optical power.

2. The vehicle projection lamp module according to claim 1, characterized in that, The horizontal field of view is set to A, and the vertical field of view is set to B, where A > 2B.

3. A vehicle projection lamp module according to claim 2, characterized in that, The material of the fourth lens (14) has an Abbe number of less than 30.

4. A vehicle projection lamp module according to claim 3, characterized in that, The materials of the third lens (13) and the fifth lens (15) have an Abbe number greater than 45.

5. A vehicle projection lamp module according to claim 4, characterized in that, The materials of the first lens (11) and the second lens (12) have an Abbe number greater than 45.

6. A vehicle projection lamp module according to claim 5, characterized in that, The fourth lens (14) is configured as a biconcave lens.

7. A vehicle projection lamp module according to claim 6, characterized in that, The fifth lens (15) is configured as a biconvex lens.

8. A vehicle projection lamp module according to claim 7, characterized in that, At least one of the two surfaces of the first lens (11) is configured as any one of a complex surface, a cylindrical surface, or a tire surface.

9. A vehicle projection lamp module according to claim 8, characterized in that, At least one of the two surfaces of the second lens (12) is configured as any one of a complex surface, a cylindrical surface, or a tire surface.

10. A vehicle projection lamp module according to any one of claims 1-9, characterized in that, The first lens (11), the second lens (12), the third lens (13), the fourth lens (14), and the fifth lens (15) are all configured as multi-element composite lenses or multi-element cemented lenses.

Images