Automobile LOGO projection lamp lens

Abstract

The utility model discloses an automobile LOGO projection lamp lens, the surface of the lens adjacent to the left side is defined as an image side surface, the surface of the lens adjacent to the right side is defined as a light source surface, and a first lens with positive focal power, a second lens with negative focal power and a third lens with positive focal power are sequentially arranged from the left side to the right side along the optical axis of the lens; the second lens is provided with negative focal power; the third lens is provided with positive focal power; the fourth lens is a flat glass film lens; a fifth lens, wherein the fifth lens has positive focal power; a sixth lens, wherein the sixth lens has positive focal power; the first lens, the second lens and the third lens form a front lens group, and the fifth lens and the sixth lens form a rear lens group. The utility model is formed by combining one glass plate film and five plastic lenses, and has the advantages of low cost, high brightness uniformity, no obvious smear or chromatic aberration and the like.

Description

Technical Field

[0001] The utility model relates to the field of optical lenses, in particular to an automotive LOGO projection lamp lens. Background Art

[0002] With the increasing youthfulness of car users, customers' definition of a car is no longer limited to a means of transportation. Instead, there are more demands for a sense of technology, interactivity, and personalization. An automotive LOGO projection lamp lens, also known as a vehicle-mounted welcome lamp, is a device that illuminates the ground at the bottom of the car door when the driver or passenger is about to get in the car, either when opening the car door instantly or when pushing open the car door after turning off the engine. While illuminating the ground, different LOGO patterns (usually the automotive LOGO pattern) are presented. When the car door is closed, it goes out instantly, adding a sense of ceremony and interactivity to the process of using the car. However, the existing automotive welcome projection lamps have the disadvantages of high cost, uneven brightness, obvious trailing shadows, or color differences. Summary of the Utility Model

[0003] Based on this, the purpose of the utility model is to provide an automotive LOGO projection lamp lens, which is composed of 1 piece of glass flat film and 5 pieces of plastic lenses, and has the advantages of low cost, high brightness uniformity, no obvious trailing shadows or color differences.

[0004] The purpose of the utility model is achieved through the following technical solutions:

[0005] An automotive LOGO projection lamp lens, defining the surface adjacent to the left side of the lens as the image side and the surface adjacent to the right side of the lens as the light source side, is sequentially arranged from left to right along the optical axis of the lens:

[0006] An aperture stop,

[0007] A first lens, the first lens being an aspherical plastic lens with positive optical power;

[0008] A second lens, the second lens being an aspherical plastic lens with negative optical power;

[0009] A third lens, the third lens being an aspherical plastic lens with positive optical power;

[0010] A fourth lens, the fourth lens being a flat glass film lens;

[0011] A fifth lens, the fifth lens being an aspherical plastic lens with positive optical power or a spherical plastic lens with positive optical power;

[0012] A sixth lens, the sixth lens being an aspherical plastic lens with positive optical power or a spherical plastic lens with positive optical power;

[0013] An image light source;

[0014] Among them, the first lens, the second lens, and the third lens form a front lens group, and the fifth lens and the sixth lens form a rear lens group;

[0015] The focal length of the front lens group is f11, and +5.66 mm ≤ f11 ≤ +11.12 mm;

[0016] The focal length of the rear lens group is f22, and +4.32 mm ≤ f22 ≤ +7.68 mm.

[0017] Furthermore, the overall optical length of the lens is TTL, and TTL ≤ 21 mm.

[0018] Furthermore, the thickness of the fourth lens is controlled within 0.5 - 1.5 mm.

[0019] Furthermore, the focal lengths, refractive indices, and curvature radii of the first lens, the second lens, the third lens, the fifth lens, and the sixth lens respectively satisfy the following conditions:

[0020] f1 +3.32～+5.78 ND1 1.49～1.55 R11 +6.81～+58.22 R12 -5.54～-1.43 f2 -4.78～-2.12 ND2 1.59～1.66 R21 +6.31～+7.55 R22 +7.56～+8.94 f3 +5.76～+7.83 ND3 1.49～1.55 R31 +3.76～+7.67 R32 -15.33～-7.21 f5 +7.31～+12.78 ND5 1.49～1.75 R51 +2.87～+6.43 R52 +5.95～+33.55 f6 +8.13～+21.49 ND6 1.49～1.75 R61 +2.67～+5.38 R62 +5.67～+33.06

[0021] Among them, f1 is the focal length of the first lens, ND1 is the refractive index of the first lens, R11 is the curvature radius of the image side of the first lens, and R12 is the curvature radius of the light source side of the first lens;

[0022] f2 is the focal length of the second lens, ND2 is the refractive index of the second lens, R21 is the curvature radius of the image side of the second lens, and R22 is the curvature radius of the light source side of the second lens;

[0023] f3 is the focal length of the third lens, ND3 is the refractive index of the third lens, R31 is the curvature radius of the image side of the third lens, and R32 is the curvature radius of the light source side of the third lens;

[0024] f5 is the focal length of the fifth lens, ND5 is the refractive index of the fifth lens, R51 is the curvature radius of the image side of the fifth lens, and R52 is the curvature radius of the light source side of the fifth lens;

[0025] f6 is the focal length of the sixth lens, ND6 is the refractive index of the sixth lens, and R61 is the curvature radius of the light source side of the sixth lens; the unit of the focal length is mm; the unit of the curvature radius is mm; the "+" sign indicates the positive direction, and the "-" sign indicates the negative direction.

[0026] Furthermore, when the fifth lens is an aspherical plastic lens with positive optical power and the sixth lens is an aspherical plastic lens with positive optical power, the aspheric surfaces of the first lens, the second lens, the third lens, the fifth lens, and the sixth lens satisfy the following formula:

[0027]

[0028] Wherein, Z is the sagittal height of the lens along the optical axis direction, k is the conic coefficient of the conic surface, γ is the lens height, c is the lens curvature, and A, B, C, D, E, F, G are the coefficients of the 4th, 6th, 8th, 10th, 12th, 14th, and 16th order terms of the aspheric polynomial.

[0029] The beneficial effects of the present utility model are as follows:

[0030] Compared with the existing LOGO projection lamp lenses on the market, the automotive LOGO projection lamp lens of the present utility model is composed of 1 glass flat film and 5 plastic lenses, and its cost is low; in addition, through reasonable selection of lens materials, distribution of optical power, and optimization of optical design, the aberration of this combined lens system is well corrected, the uniformity of the projection screen is good, there is no obvious ghosting and purple fringing, and it has high commercial value; in terms of manufacturability, the thickness of each lens is uniform and insensitive, and it is easy to be formed and manufactured, with high cost performance. Description of the Drawings

[0031] Figure 1 It is a schematic diagram of the optical structure of an embodiment of the present utility model;

[0032] Figure 2 It is a schematic diagram of the projection route of an embodiment of the present utility model;

[0033] Figure 3 It is an analysis diagram of the screen uniformity of an embodiment of the present utility model;

[0034] Figure 4 It is the actual projection effect diagram of an embodiment of the present utility model;

[0035] Reference numerals: 1, the first lens; 2, the second lens; 3, the third lens; 4, the fourth flat film lens; 5, the fifth lens; 6, the sixth lens; 7, the image light source; 8, the aperture stop. Detailed Embodiments

[0036] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. In this specification, the expressions such as left, right, first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. The shapes of the spherical or aspherical surfaces are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only for illustration and are not drawn strictly to scale.

[0037] Unless otherwise defined, all terms (including technical and scientific terms) used in this utility model have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and will not be interpreted in an idealized or overly formal sense unless expressly so defined in this utility model.

[0038] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments may be combined with each other. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of this utility model. For better understanding and implementation, the following describes this utility model in detail with reference to the accompanying drawings.

[0039] This utility model provides an automotive LOGO projection lamp lens. Define the surface adjacent to the left side of the lens as the image side, and the surface adjacent to the right side of the lens as the light source side. Along the optical axis of the lens, from left to right in sequence are arranged: an aperture stop 8, a first lens 1, a second lens 2, a third lens 3, a fourth lens 4, a fifth lens 5, a sixth lens 6, and an image light source 7. Specifically:

[0040] The first lens 1 is an aspherical plastic lens with a positive optical power;

[0041] The second lens 2 is an aspherical plastic lens with a negative optical power;

[0042] The third lens 3 is an aspherical plastic lens with a positive optical power;

[0043] The fourth lens 4 is a flat glass film lens;

[0044] The fifth lens 5 is an aspherical plastic lens with a positive optical power or a spherical plastic lens with a positive optical power;

[0045] The sixth lens 6 is an aspherical plastic lens with a positive optical power or a spherical plastic lens with a positive optical power;

[0046] The aperture stop 8 is arranged on the image side of the first lens 1; the image light source 7 is arranged on the light source side of the sixth lens 6.

[0047] Among them, the first lens 1, the second lens 2, and the third lens 3 form a front lens group, and the fifth lens 5 and the sixth lens 6 form a rear lens group; where:

[0048] The focal length of the front lens group is f11, +5.66 mm ≤ f11 ≤ +11.12 mm;

[0049] The focal length of the rear lens group is f22, where +4.32 mm ≤ f22 ≤ +7.68 mm;

[0050] The total optical length of the lens is TTL, where TTL ≤ 21 mm;

[0051] The thickness of the fourth lens is controlled within 0.5 - 1.5 mm.

[0052] In the present utility model, in order to enable the optical system to exhibit better performance, during the design process, the lens material should be reasonably selected, the focal lengths of each lens should be reasonably allocated, and the optical system should be reasonably optimized. Ultimately, the performance of the optical system is optimized. Usually, the existence of optical system aberrations will affect the imaging quality of the optical system. Correcting aberrations is the key to optimizing the optical system. There are many methods for correcting aberrations. For example, using lenses with different refractive indices and significantly different Abbe numbers in combination can eliminate chromatic aberration and spherical aberration to a certain extent. Reasonably allocating and optimizing the focal lengths and shapes of each lens can also correct the aberrations of the system.

[0053] In the present utility model, considering the aberrations of the optical system and the problem of balancing temperature drift, the focal lengths, refractive indices, and curvature radii of each lens respectively satisfy the following conditions:

[0054] f1 +3.32～+5.78 ND1 1.49～1.55 R11 +6.81～+58.22 R12 -5.54～-1.43 f2 -4.78～-2.12 ND2 1.59～1.66 R21 +6.31～+7.55 R22 +7.56～+8.94 f3 +5.76～+7.83 ND3 1.49～1.55 R31 +3.76～+7.67 R32 -15.33～-7.21 f5 +7.31～+12.78 ND5 1.49～1.75 R51 +2.87～+6.43 R52 +5.95～+33.55 f6 +8.13～+21.49 ND6 1.49～1.75 R61 +2.67～+5.38 R62 +5.67～+33.06

[0055] Among them, f1 is the focal length of the first lens 1, ND1 is the refractive index of the first lens 1, R11 is the curvature radius of the image side of the first lens 1, and R12 is the curvature radius of the light source side of the first lens 1;

[0056] f2 is the focal length of the second lens 2, ND2 is the refractive index of the second lens 2, R21 is the curvature radius of the image side of the second lens 2, and R22 is the curvature radius of the light source side of the second lens 2;

[0057] f3 is the focal length of the third lens 3, ND3 is the refractive index of the third lens 3, R31 is the curvature radius of the image side of the third lens 3, and R32 is the curvature radius of the light source side of the third lens 3;

[0058] f5 is the focal length of the fifth lens 5, ND5 is the refractive index of the fifth lens 5, R51 is the curvature radius of the image side of the fifth lens 5, and R52 is the curvature radius of the light source side of the fifth lens 5;

[0059] f6 is the focal length of the sixth lens 6, ND6 is the refractive index of the sixth lens 6, and R61 is the curvature radius of the light source side of the sixth lens 6;

[0060] The unit of the focal length is mm; the unit of the curvature radius is mm; the "+" sign indicates a positive direction, and the "-" sign indicates a negative direction.

[0061] In the present utility model, when the fifth lens 5 is an aspherical plastic lens with a positive optical power and the sixth lens 6 is an aspherical plastic lens with a positive optical power, the aspheric surfaces of the first lens 1, the second lens 2, the third lens 3, the fifth lens 5 and the sixth lens 6 can all be defined by the following equation of an even aspheric surface:

[0062]

[0063] In the formula, Z is the sagittal height of the lens along the optical axis direction, k is the conic coefficient of the quadric surface, γ is the lens height, c is the lens curvature, and A - G are the coefficients of the 4th, 6th, 8th, 10th, 12th, 14th, and 16th order terms of the aspheric polynomial.

[0064] Reference Figure 1 and Figure 2 shown in, which are respectively the schematic diagram of the optical structure and the schematic diagram of the optical path structure of an embodiment of the present utility model.

[0065] In the lens of this embodiment, the surface adjacent to the left side of the lens is defined as the image side, and the surface adjacent to the right side of the lens is defined as the light source side. Along the optical axis of the lens, from left to right, are arranged in sequence:

[0066] An aperture stop 8,

[0067] A first lens 1, the first lens 1 being an aspherical plastic lens with a positive optical power;

[0068] A second lens 2, the second lens 2 being an aspherical plastic lens with a negative optical power;

[0069] A third lens 3, the third lens 3 being an aspherical plastic lens with a positive optical power;

[0070] A fourth lens 4, the fourth lens 4 being a flat glass film lens;

[0071] A fifth lens 5, the fifth lens 5 being an aspherical plastic lens with a positive optical power;

[0072] A sixth lens 6, the sixth lens 6 being an aspherical plastic lens with a positive optical power;

[0073] An image light source 8.

[0074] Among them, the first lens 1, the second lens 2 and the third lens 3 form a front lens group, and the fifth lens 5 and the sixth lens 6 form a rear lens group;

[0075] The focal length of the front lens group is f11, f11 = 7.72 mm;

[0076] The focal length of the rear lens group is f22, f22 = 5.01 mm.

[0077] In the embodiment of the present utility model, the image side of the first lens 1 is convex and the light source side is convex. A plastic aspherical lens with a double-convex positive optical power is adopted, and its shape is uniform, which is easy for mold processing and injection molding machinery; the second lens 2 is a meniscus-shaped negative optical power plastic aspherical lens with a convex image side and a concave light source side, and its main function is to correct the system aberration to achieve a better projection effect. The fourth lens 4 is a flat glass film lens and is placed between the third lens 3 and the fifth lens 5, and the thickness is controlled within 1.0 mm.

[0078] Considering issues such as the aberration of the optical system, balance of temperature drift, and day-night co-focus, the curvature radius, central thickness, refractive index, Abbe number, and aspherical K value of each lens are designed as shown in Table 1. Table 1 shows the curvature radius R (unit: mm) of each lens, the central thickness d (unit: mm) of each lens, the refractive index (ND) of each lens, the Abbe number (VD) of each lens, and the aspherical K value (Conic) of each lens.

[0079] Table 1

[0080] Surface number Radius of curvature R Central thickness D Refractive index ND Abbe number VD K Object INFINITY 1000 Conic Stop INFINITY 1.00E-01 11 8.10E+00 1.80E+00 1.54 55.71 -2.05E+00 12 -4.34E+00 1.50E-01 -1.08E+01 21 4.20E+00 1.50E+00 1.64 23.92 1.36E+00 22 1.44E+00 3.14E+00 -2.41E+00 31 4.78E+00 3.00E+00 1.54 55.71 -5.47E-01 32 -1.50E+01 2.46E+00 1.71E-01 41 INFINITY 1.00E+00 1.52 64.20 0 42 INFINITY 3.00E-01 0 51 4.48E+00 2.20E+00 1.54 55.71 0 52 2.44E+01 2.00E-01 0 61 4.11E+00 3.00E+00 1.54 55.71 0 62 5.19E+00 2.15E+00 0 71 INFINITY

[0081] In Table 1, the curvature radius R represents the degree of curvature of the lens surface. A positive value represents that the surface bends towards the image side, and a negative value represents that the surface bends towards the object side, where "INFINITY" represents that the surface is a plane; the central thickness D represents the central axial distance from the current surface to the next surface, the refractive index ND represents the ability of the current lens material to refract light, the Abbe number VD represents the dispersion characteristics of the current lens material to light; the k value represents the numerical value of the best-fit conic coefficient of the aspherical surface. 11 represents the object side of the first lens 11, 12 represents the image side of the first lens 11, and so on.

[0082] The aspherical surfaces of the first lens 1, the second lens 2, the third lens 3, the fifth lens 5, and the sixth lens 6 in the embodiment of the present utility model can all be defined by the above equation of the even aspherical surface.

[0083] Table 2 shows the coefficients of each aspherical surface of the first lens 1, the second lens 2, the third lens 3, the fifth lens 5, and the sixth lens 6.

[0084] Table 2

[0085] Surface number A B C D E F G 11 1.46E-03 -5.87E-05 -1.66E-05 0 0 0 0 12 1.08E-04 5.81E-04 -1.17E-04 0 0 0 0 21 -1.25E-02 1.52E-03 -2.67E-04 0 0 0 0 22 8.65E-03 -3.21E-04 -1.06E-04 0 0 0 0 31 -2.51E-03 7.47E-05 -3.23E-06 0 0 0 0 32 -7.71E-04 -9.15E-05 3.73E-06 0 0 0 0 51 -1.56E-03 -1.00E-04 -9.68E-07 0 0 0 0 52 -3.74E-04 8.17E-06 -2.50E-07 0 0 0 0 61 1.00E-02 -2.67E-04 1.95E-06 0 0 0 0 62 -8.08E-03 2.41E-05 5.56E-06 0 0 0 0

[0086] Reference Figure 2 As shown, it is a schematic diagram of the projection route of the automotive LOGO projection lamp. The height of the automotive projection lamp from the ground is 1000 mm, and the diameter of the light surface projected by the automotive projection lamp is φ840 mm.

[0087] Reference Figure 3As shown, this is the analysis of the brightness uniformity of the projection screen of this lens in this embodiment. It can be seen from the figure that at a projection distance of 1000 mm, good brightness uniformity can be achieved within φ840 mm.

[0088] Reference Figure 4 As shown, this is the projection effect diagram of an actual application of this lens in this embodiment. It can be seen from the actual effect diagram that the brightness of the LOGO pattern is uniform, and there are no obvious trailing shadows and color cast phenomena.

[0089] In summary, this automotive LOGO projection lamp lens is composed of a combination of 1 spherical glass flat film and 5 aspherical plastic lenses. It has a low cost, and each lens is insensitive, and the lens surface shape is simple and easy to manufacture. At the same time, the present utility model comprehensively considers the aberrations of the optical system. Through reasonable selection of lens materials, distribution of optical power, and optimization of optical design, the projection screen has good uniformity, no obvious trailing shadows and purple edges, and has high commercial value.

[0090] The above only expresses the preferred technical solutions of the present utility model, and its description is relatively specific and detailed, but it should not be construed as a limitation to the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and the present utility model also intends to include these modifications and deformations.

Claims

1. A car LOGO projection lamp lens, wherein the surface of the lens adjacent to the left side is defined as the image side, and the surface of the lens adjacent to the right side is defined as the light source side, characterized in that: Set from left to right along the lens optical axis: Aperture diaphragm, A first lens, wherein the first lens is an aspherical plastic lens with positive optical power; A second lens, wherein the second lens is an aspherical plastic lens with negative optical power; A third lens, wherein the third lens is an aspherical plastic lens with positive optical power; A fourth lens, wherein the fourth lens is a flat glass film lens; a fifth lens, wherein the fifth lens is an aspherical plastic lens with positive optical power or a spherical plastic lens with positive optical power; a sixth lens, wherein the sixth lens is an aspherical plastic lens with positive optical power or a spherical plastic lens with positive optical power; Image light source; Wherein, the first lens, the second lens and the third lens form a front lens group, and the fifth lens and the sixth lens form a rear lens group; The focal length of the front lens group is f11, +5.66mm≤f11≤+11.12mm; The focal length of the rear lens group is f22, +4.32mm≤f22≤+7.68mm; The total optical length of the lens is TTL, TTL≤21mm.

2. The automotive LOGO projection lamp lens according to claim 1, characterized in that: The thickness of the fourth lens is controlled to be between 0.5 and 1.5 mm.

3. The automotive LOGO projection lamp lens according to claim 1, characterized in that: The focal length ranges corresponding to the first lens, the second lens, the third lens, the fifth lens and the sixth lens are respectively +3.32 to +5.78, -4.78 to -2.12, +5.76 to +7.83, +7.31 to +12.78, and +8.13 to +21.49; wherein the "+" sign indicates that the lens has a positive optical power, and the "-" sign indicates that the lens has a negative optical power, and the unit of the focal length is mm.

4. The automotive LOGO projection lamp lens according to claim 1, characterized in that: The refractive index ranges corresponding to the first lens, the second lens, the third lens, the fifth lens and the sixth lens are 1.49-1.55, 1.59-1.66, 1.49-1.55, 1.49-1.75 and 1.49-1.75 respectively.

5. The automotive LOGO projection lamp lens according to claim 1, characterized in that: The object side surface radii of curvature corresponding to the first lens, the second lens, the third lens, the fifth lens and the sixth lens are in the range of +6.81 to +58.22, +6.31 to +7.55, +3.76 to +7.67, +2.87 to +6.43 and +2.67 to +5.38 respectively; wherein the "+" sign indicates that the surface is bent toward the image plane, and the "-" sign indicates that the surface is bent toward the object plane, and the unit of the curvature radius is mm.

6. The automotive LOGO projection lamp lens according to claim 1, characterized in that: The image side surface curvature radii corresponding to the first lens, the second lens, the third lens, the fifth lens and the sixth lens are in the range of -5.54 to -1.43, +7.56 to +8.94, -15.33 to -7.21, +5.95 to +33.55, and +5.67 to +33.06, respectively; wherein the "+" sign indicates that the surface is bent toward the image side, and the "-" sign indicates that the surface is bent toward the object side, and the unit of the curvature radius is mm.

Images