Greeting lamp lens suitable for DMD imaging system

Abstract

The utility model relates to a welcome lamp lens suitable for a DMD imaging system, an optical system is composed of a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens, a seventh lens and an eighth lens, the first lens is a meniscus concave negative lens, the second lens is a meniscus concave negative lens, the third lens is a meniscus concave negative lens, and the fourth lens is a meniscus concave negative lens. The fourth lens is a biconvex positive lens, the fifth lens is a meniscus positive lens, the sixth lens is a biconcave negative lens, the seventh lens is a biconvex positive lens, the eighth lens is a biconvex positive lens, the third lens and the fourth lens form a balsaming lens group, and the sixth lens and the seventh lens form a balsaming lens group. The first lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are all glass spherical lenses, and the second lens is a glass aspheric lens. According to the utility model, the imaging angle of the lens to an object is greater than 110 degrees, and TV Distortion can be ensured while a picture with the width of 45 cm can be projected at a position of 25 cm; 1%.

Description

Technical field:

[0001] The utility model belongs to the technical field of lenses, and in particular relates to a welcome light lens suitable for a DMD imaging system. Background technology:

[0002] The role of the welcome light is to increase the high-tech sense of the vehicle and enhance the commodity nature of the product. It is generally used in the high-end and top-end configuration derivatives of the vehicle. The commonly used welcome light solutions are mostly solutions using film. Because the LOGO needs to be projected on the ground, the first step is to focus the light source on the focus of the LOGO; the second step is to diverge the light that converges through the LOGO film to achieve the effect of magnifying the LOGO. The more widely used is the film film with a PET substrate. Using the imaging principle of the film camera, the LOGO pattern is exposed and engraved on the film film. The first GAC passenger car to use the exterior rearview mirror welcome light was a certain model. After application, it was favored by customers and greatly improved the user experience. However, as users become younger and younger, the market is increasingly dissatisfied with the solution that can only project a single LOGO, and is looking forward to new implementation solutions that can project different patterns or even dynamic videos. Utility model content:

[0003] The present invention aims to improve the problems existing in the prior art, that is, the technical problem to be solved by the present invention is to provide a welcome light lens and an imaging method thereof suitable for a DMD imaging system.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a welcome light lens suitable for a DMD imaging system, the optical system of the lens is composed of a first lens, a second lens, a third lens, a fourth lens, an aperture, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are arranged in sequence from left to right along the incident light path of the light, the first lens is a meniscus concave negative lens, the second lens is a meniscus concave negative lens, the third lens is a meniscus concave negative lens, the fourth lens is a double convex positive lens, the fifth lens is a meniscus positive lens, the sixth lens is a double concave negative lens, the seventh lens is a double convex positive lens, the eighth lens is a double convex positive lens, the third lens and the fourth lens are glued to form a first glued lens group, the sixth lens and the seventh lens are glued to form a second glued lens group, the first lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are all glass spherical lenses, and the second lens is a glass aspherical lens.

[0005] Furthermore, the object side surface of the first lens is convex, and the image side surface is concave; the object side surface of the second lens is convex, and the image side surface is concave; the object side surface of the third lens is convex, and the image side surface is concave; the object side surface of the fourth lens is convex, and the image side surface is convex; the object side surface of the fifth lens is concave, and the image side surface is convex; the object side surface of the sixth lens is concave, and the image side surface is concave; the object side surface of the seventh lens is convex, and the image side surface is convex; the object side surface of the eighth lens is convex, and the image side surface is convex.

[0006] Furthermore, the focal length of the optical system is f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are f respectively. 1 、f 2 、f 3 、f 4 、f 5 、f 6 、f 7 、f 8 , where f 1 、f 2 、f 3 、f 4 、f 5 、f 6 、f 7 、f 8 Satisfies the following ratio with f: -9.0 <f 1 / f<-8.0,-6.0 <f 2 / f<-5.0,-2.0 <f 3 / f<-1.0,1.0 <f 4 / f<2.0,8.0 <f 5 / f<9.0,-6.0 <f 6 / f<-5.0,5.0 <f 7 / f<6.0,6.0 <f 8 / f<7.0.

[0007] Furthermore, the first lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; the second lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; the third lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; the fourth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; the fifth lens satisfies the relationship: 1.5≤N d ≤1.8, V d≤50.0; the sixth lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; the seventh lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; the eighth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; where N d is the refractive index, V d is the Abbe constant.

[0008] Furthermore, the axial distances between the lenses satisfy the following relationship: the air gap between the first lens and the second lens is 4.1 to 4.5 mm; the air gap between the second lens and the third lens is 11.1 to 11.5 mm; the air gap between the fourth lens and the aperture is 3.1 to 3.5 mm; the air gap between the aperture and the fifth lens is 5.1 to 5.5 mm; the air gap between the fifth lens and the sixth lens is 0.0 to 0.5 mm; and the air gap between the seventh lens and the eighth lens is 0.0 to 0.5 mm.

[0009] Furthermore, the total optical length TTL of the optical system and the focal length f of the optical system satisfy: TTL / f≤20.

[0010] Furthermore, the F number of the optical system is ≤1.8.

[0011] Furthermore, the image height H of the optical system and the focal length f of the optical system satisfy: H / f≥1.0.

[0012] Compared with the prior art, the utility model has the following effects: the utility model has a reasonable design, the imaging angle of the lens to the object is greater than 110 degrees, and a 45cm wide picture can be projected at 25cm while ensuring that TV Distortion is less than 1%; it has the advantages of large aperture, low tolerance sensitivity and good high and low temperature stability; it has a compact and reasonable structure, is easy to assemble, has low tolerance sensitivity, and is more suitable for large-scale high-yield production. Description of the drawings:

[0013] Figure 1 It is a schematic diagram of the optical structure of an embodiment of the utility model;

[0014] Figure 2 This is a full-band axial chromatic aberration diagram of an embodiment of the utility model;

[0015] Figure 3 This is a field curvature distortion diagram of the full working band of an embodiment of the utility model;

[0016] Figure 4It is the MTF diagram of the full working band of the embodiment of the utility model.

[0017] In the figure: STO-aperture; L1-first lens; L2-second lens; L3-third lens; L4-fourth lens; L5-fifth lens; L6-sixth lens; L7-seventh lens; L8-eighth lens; IMA-imaging surface. Specific implementation method:

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0019] like Figure 1 As shown, the utility model is a welcome light lens suitable for a DMD imaging system, the optical system of the lens consists of a first lens, a second lens, a third lens, a fourth lens, an aperture, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are arranged in sequence from left to right along the incident light path of the light, without considering the backcurvature caused by the aspheric coefficient, the first lens is a meniscus concave negative lens, the second lens is a meniscus concave negative lens, the third lens is a meniscus concave negative lens, the fourth lens is a double convex positive lens, the fifth lens is a meniscus positive lens, the sixth lens is a double concave negative lens, the seventh lens is a double convex positive lens, the eighth lens is a double convex positive lens, the third lens and the fourth lens are glued to form a first glued lens group, and the sixth lens and the seventh lens are glued to form a second glued lens group; the lenses are made of glass material, the first lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are all glass spherical lenses, and the second lens is a glass aspheric lens.

[0020] In this embodiment, the object side surface of the first lens is convex, and the image side surface is concave; the object side surface of the second lens is convex, and the image side surface is concave; the object side surface of the third lens is convex, and the image side surface is concave; the object side surface of the fourth lens is convex, and the image side surface is convex; the object side surface of the fifth lens is concave, and the image side surface is convex; the object side surface of the sixth lens is concave, and the image side surface is concave; the object side surface of the seventh lens is convex, and the image side surface is convex; the object side surface of the eighth lens is convex, and the image side surface is convex.

[0021] In this embodiment, the focal length of the optical system is f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are f respectively. 1 、f 2 、f 3 、f 4 、f 5 、f 6 、f 7 、f 8 , where f 1 、f 2 、f 3 、f4 、f 5 、f 6 、f 7 、f 8 Satisfies the following ratio with f: -9.0 <f 1 / f<-8.0,-6.0 <f 2 / f<-5.0,-2.0 <f 3 / f<-1.0,1.0 <f 4 / f<2.0,8.0 <f 5 / f<9.0,-6.0 <f 6 / f<-5.0,5.0 <f 7 / f<6.0,6.0 <f 8 / f<7.0.

[0022] In this embodiment, the first lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; the second lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; the third lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; the fourth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; the fifth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; the sixth lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; the seventh lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; the eighth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; where N d is the refractive index, V d is the Abbe constant.

[0023] In this embodiment, the axial distances between the lenses satisfy the following relationship: the air gap between the first lens and the second lens is 4.1 to 4.5 mm; the air gap between the second lens and the third lens is 11.1 to 11.5 mm; the air gap between the fourth lens and the aperture is 3.1 to 3.5 mm; the air gap between the aperture and the fifth lens is 5.1 to 5.5 mm; the air gap between the fifth lens and the sixth lens is 0.0 to 0.5 mm; and the air gap between the seventh lens and the eighth lens is 0.0 to 0.5 mm.

[0024] In this embodiment, the total optical length TTL of the optical system and the focal length f of the optical system satisfy: TTL / f≤20.

[0025] In this embodiment, the F number of the optical system is ≤1.8.

[0026] In this embodiment, the image height H of the optical system and the focal length f of the optical system satisfy: H / f≥1.0.

[0027] In this embodiment, the aspheric curve equation of the second lens is expressed as:

[0028]

[0029] Where Z is the height of the aspheric surface from the vertex of the aspheric surface at a height of r along the optical axis; c is the paraxial curvature of the aspheric surface; k is the cone constant; α 1 , α 2 , α 3 , α 4 , α 5 , α 6 , α 7 , α 8 All are high-order coefficients.

[0030] Specifically: The aspheric coefficients of aspheric lenses are as follows:

[0031]

[0032] In this embodiment, the first lens and the second lens are both glass lenses with negative focal length, which can adjust large-angle light, and the glass aspheric surface can also reduce the distortion of the optical system. The third lens and the fourth lens, the sixth lens and the seventh lens form an achromatic doublet. Reasonable lens matching enables the optical system to achieve wide-angle, low distortion, low dispersion, large aperture, and low-temperature drift design. At the same time, the on-axis and off-axis aberrations are well corrected, so that the lens has good imaging quality, such as Figures 2 to 4 As shown. The technical indicators achieved by this optical system are as follows:

[0033] (1) Focal length: 2.0 ≤ EFFL ≤ 3.0 mm;

[0034] (2) Aperture F ≤ 1.8;

[0035] (3) Field of view: 2w ≥ 110°;

[0036] (4) Working band: visible light band.

[0037] To achieve the above design parameters, the specific design adopted by the optical system of this embodiment is shown in the following table:

[0038]

[0039] In this embodiment, when the welcome light lens suitable for the DMD imaging system is imaged, the light path sequentially enters the first lens, the second lens, the third lens, the fourth lens, the aperture, the fifth lens, the sixth lens, the seventh lens and the eighth lens for imaging.

[0040] The optical system of this embodiment reduces the total length of the lens and the radial size of each lens while meeting the imaging performance requirements of the lens by reasonably allocating the optical power, surface shape, center thickness of each lens, and axial distance between each lens, thereby miniaturizing the lens group.

[0041] The utility model has the following advantages:

[0042] 1. The imaging angle of the lens to the object is greater than 110 degrees, and it can project a 45cm wide picture at a distance of 25cm while ensuring that TV Distortion is less than 1%;

[0043] 2. It has the advantages of large aperture, low tolerance sensitivity and good high and low temperature stability;

[0044] 3. Through the reasonable matching of optical lenses, the system structure is compact and reasonable, easy to assemble, with low tolerance sensitivity, and more suitable for large-scale high-yield production;

[0045] 4. The all-glass structure has high stability and can adapt to harsh environments. It also gives full play to the advantages of aspherical lenses in correcting aberrations. While meeting high-definition imaging requirements, it has a smaller lens outer diameter and shorter total optical length, ensuring miniaturization of the lens.

[0046] 5. Able to make good compensation for focal plane displacement at high and low temperatures, and have adaptability to complex environments;

[0047] 6. Corrected various axial chromatic aberrations, vertical chromatic aberrations and high-order chromatic aberrations to ensure that the imaging system can have high imaging quality even at large angles;

[0048] 7. Give full play to the advantages of aspherical lenses in correcting aberrations, meet the requirements of high-definition imaging, have a smaller lens outer diameter and a shorter total optical length, and ensure the miniaturization of the lens.

[0049] If the present invention discloses or involves components or structures that are fixedly connected to each other, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (for example, connection using bolts or screws), and can also be understood as: a non-detachable fixed connection (for example, riveting, welding). Of course, the mutual fixed connection can also be replaced by an integrated structure (for example, manufactured by one-piece molding using a casting process) (except where it is obviously impossible to use an one-piece molding process).

[0050] In addition, unless otherwise stated, the terms used to indicate positional relationships or shapes in any of the technical solutions disclosed in the above utility model include states or shapes that are approximate, similar or close thereto.

[0051] Any component provided by the utility model can be assembled from multiple separate components, or can be a separate component manufactured by an integrated forming process.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the utility model can still be modified or some technical features can be replaced by equivalents without departing from the spirit of the technical solution of the utility model, which should be included in the scope of the technical solution for protection of the utility model.

Claims

1. A welcome light lens suitable for a DMD imaging system, characterized in that: The optical system of the lens consists of a first lens, a second lens, a third lens, a fourth lens, an aperture, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are arranged in sequence from left to right along the incident light path of the light; the first lens is a meniscus concave negative lens, the second lens is a meniscus concave negative lens, the third lens is a meniscus concave negative lens, the fourth lens is a biconvex positive lens, the fifth lens is a meniscus positive lens, the sixth lens is a biconcave negative lens, the seventh lens is a biconvex positive lens, the eighth lens is a biconvex positive lens, the third lens and the fourth lens are glued together to form a first glued lens group, the sixth lens and the seventh lens are glued together to form a second glued lens group, the first lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are all glass spherical lenses, and the second lens is a glass aspherical lens.

2. The welcome light lens suitable for a DMD imaging system according to claim 1, characterized in that: The object side surface of the first lens is convex, and the image side surface is concave; the object side surface of the second lens is convex, and the image side surface is concave; the object side surface of the third lens is convex, and the image side surface is concave; the object side surface of the fourth lens is convex, and the image side surface is convex; the object side surface of the fifth lens is concave, and the image side surface is convex; the object side surface of the sixth lens is concave, and the image side surface is concave; the object side surface of the seventh lens is convex, and the image side surface is convex; the object side surface of the eighth lens is convex, and the image side surface is convex.

3. The welcome light lens suitable for a DMD imaging system according to claim 2, characterized in that: The focal length of the optical system is f, and the focal lengths of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are f1, f2, f3, f4, f5, f6, f7, f8 respectively, where f1, f2, f3, f4, f5, f6, f7, f8 and f satisfy the following ratio: -9.0 <f1 / f<-8.0,-6.0<f2 / f<-5.0,-2.0<f3 / f<-1.0,1.0<f4 / f<2.0,8.0<f5 / f<9.0,-6.0<f6 / f<-5.0,5.0<f7 / f<6.0,6.0<f8 / f<7.0。 4. The welcome light lens suitable for a DMD imaging system according to claim 1, characterized in that: The first lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; the second lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; the third lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; the fourth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; the fifth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; the sixth lens satisfies the relationship: 1.7≤N d ≤2.0, V d ≤50.0; the seventh lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≥50.0; the eighth lens satisfies the relationship: 1.5≤N d ≤1.8, V d ≤50.0; where N d is the refractive index, V d is the Abbe constant.

5. The welcome light lens suitable for a DMD imaging system according to claim 2, characterized in that: The axial distances between the lenses satisfy the following relationship: the air gap between the first lens and the second lens is 4.1 to 4.5 mm; the air gap between the second lens and the third lens is 11.1 to 11.5 mm; the air gap between the fourth lens and the aperture is 3.1 to 3.5 mm; the air gap between the aperture and the fifth lens is 5.1 to 5.5 mm; the air gap between the fifth lens and the sixth lens is 0.0 to 0.5 mm; the air gap between the seventh lens and the eighth lens is 0.0 to 0.5 mm.

6. The welcome light lens suitable for a DMD imaging system according to claim 1, characterized in that: The total optical length TTL of the optical system and the focal length f of the optical system satisfy: TTL / f≤20.

7. The welcome light lens suitable for a DMD imaging system according to claim 1, characterized in that: The F number of the optical system is ≤1.

8.

8. The welcome light lens suitable for a DMD imaging system according to claim 1, characterized in that: The image height H of the optical system and the focal length f of the optical system satisfy: H / f≥1.0.

Images