Optical lens group and vehicle lamp using same
By designing an optical lens group including glass and plastic aspherical lenses, the weight, cost and aberration problems of lens group in existing headlights are solved, and more efficient light focus and image quality are achieved.
Patent Information
- Application Number
- CN202421527353.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-01
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-07-01
AI Technical Summary
The optical lens group in existing car lights has problems such as difficult material processing, high cost, increased weight, and aberration problems, which affect image clarity and quality.
An optical lens group including a first glass lens, a second and a third plastic lens is designed. All lenses are aspherical structures. By optimizing the refractive index, focal length and surface shape of the lens, axial distortion is reduced and light focusing accuracy is improved.
The optical lens group is lightweight, miniaturized and cost-reduced, while improving image clarity and imaging quality, reducing scattering and reflection of light.
Smart Images
Figure CN222634385U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of vehicle lamps, in particular to an optical lens group and a vehicle lamp using the same. Background Art
[0002] For the optical lens group used in the headlight, in the prior art, the widely used three-piece projection lens is mostly made of glass material. Glass has high requirements for processing technology and is difficult to produce, resulting in increased costs. In addition, the assembly difficulty of multiple lens combinations also increases accordingly. The more lens combinations and the more glass materials, the heavier the projection lens is, which is contrary to the popular trend of pursuing lightweight body and headlights.
[0003] Furthermore, in the prior art, in order to improve the high pixelization of the optical lens group used in the headlight, a large number of lens stacking designs are often used, resulting in various negative impacts such as increased lens size, cost, manufacturing difficulty, and assembly difficulty.
[0004] In addition, in the prior art, most optical lens groups in car lights use spherical lenses. However, the main problem with spherical lenses is that they have large aberrations. When light is incident on a spherical lens at different positions, it will be refracted differently, resulting in the inability to completely focus on one point, forming aberrations. This aberration will affect the clarity and quality of the image, especially in the case of a large field of view and high precision requirements, the aberration problem of spherical lenses is more prominent.
[0005] In summary, based on the problems existing in the optical lens assembly in the prior art, it is necessary to further optimize and improve its structure. Utility Model Content
[0006] The first purpose of the utility model is to provide an optical lens group to solve the technical problem of optimizing its overall performance.
[0007] The second object of the utility model is to provide a vehicle lamp to solve the technical problem of optimizing the overall performance of the optical lens group used in the vehicle lamp.
[0008] The optical lens assembly of the utility model is realized as follows:
[0009] An optical lens group, comprising: a first lens, a second lens and a third lens are arranged in sequence along an optical axis direction from an object side to an image side;
[0010] The first lens is a glass lens, and the second lens and the third lens are both plastic lenses;
[0011] The image side surface of the first lens, the object side surface and the image side surface of the second lens, and the object side surface and the image side surface of the third lens are all aspherical structures; and
[0012] The object side of the first lens is planar and the image side is convex; the object side of the second lens is concave and the image side is convex; the object side of the third lens is concave and the image side is convex.
[0013] In an alternative embodiment of the present utility model, a light source is provided on the object side of the first lens.
[0014] In an alternative embodiment of the present utility model, the distance d01 between the object side of the first lens and the light source assembly satisfies: d01 ≥ 1 mm.
[0015] In an alternative embodiment of the present utility model, the refractive index of the first lens is n1, the refractive index of the second lens is n2, and the refractive index of the third lens is n3; then:
[0016] n1 < n2; n2 > n3.
[0017] In an alternative embodiment of the present utility model, the image side of the third lens satisfies the following formula: 9 mm < Sa < 15 mm; where Sa is the degree of convexity of the lens surface.
[0018] In an alternative embodiment of the present utility model, the focal length of the first lens is f1, the focal length of the second lens is f2, and the focal length of the third lens is f3; then:
[0019] 300 mm < f2 < 1300 mm; 100 mm < f3 < 200 mm; 0 < f1 / f2 < 0.1.
[0020] In an alternative embodiment of the present utility model, the relationship between the light-emitting aperture D1 of the first lens and the central thickness T1 of the first lens satisfies: D1 / T1 ≥ 1.3.
[0021] In an alternative embodiment of the present utility model, the total optical axis length L of the optical lens group satisfies the following relational expression: 60 mm ≤ L ≤ 70 mm.
[0022] In an alternative embodiment of the present utility model, the first lens, the second lens, and the third lens are all positive lenses.
[0023] The vehicle headlamp of the present utility model is implemented as follows:
[0024] A vehicle headlamp, comprising: the optical lens group described above.
[0025] By adopting the above technical solution, the utility model has the following beneficial effects: the optical lens group of the utility model and the headlight using the same only use 3 lenses, and 2 of them are plastic lenses, which is conducive to the miniaturization and lightness of the lamp and reduces the production cost; furthermore, the lens used is an aspherical lens, which can focus light more accurately, and the overall axial distortion difference is small, so that better image clarity and details can be obtained, and the imaging quality is high. The optical lens group of the utility model can better transmit light, reduce the scattering and reflection of light, and improve the transmission and imaging capabilities of the optical lens group for light. BRIEF DESCRIPTION OF THE DRAWINGS
[0026] Figure 1 is a schematic structural diagram of an optical lens assembly according to Embodiment 2;
[0027] Figure 2 is a schematic structural diagram of an optical lens assembly according to Embodiment 3;
[0028] Figure 3 is a schematic structural diagram of an optical lens assembly according to Embodiment 4;
[0029] Figure 4 is a field curvature diagram of the optical lens assembly of Example 2;
[0030] Figure 5 is a distortion diagram of the optical lens assembly of Example 2;
[0031] Figure 6 is a field curvature diagram of the optical lens assembly of Example 3;
[0032] Figure 7 is a distortion diagram of the optical lens assembly of Example 3;
[0033] Figure 8 is a field curvature diagram of the optical lens assembly of Example 4;
[0034] Fig. 9 This is a distortion diagram of the optical lens group of Example 4.
[0035] In the figure: a first lens 1, an object-side surface 11 of the first lens, an image-side surface 12 of the first lens, an object-side surface 21 of the second lens, an image-side surface 22 of the second lens, an object-side surface 31 of the third lens, an image-side surface 32 of the third lens, and an optical axis 4. DETAILED DESCRIPTION
[0036] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.
[0037] Embodiment 1:
[0038] See also Figures 1 to 9As shown in the figure, this embodiment provides an optical lens group, including: a first lens 1, a second lens 2, and a third lens 3 arranged in sequence along the optical axis 4 from the object side to the image side, and a light source 5 is provided on the object side surface of the first lens 1.
[0039] Specifically, the first lens 1, the second lens 2, and the third lens 3 are all positive lenses; the first lens 1 is a glass lens, and the second lens 2 and the third lens 3 are both plastic lenses. In this structure, that is to say, the optical lens group adopted in this embodiment only uses 3 lenses, and 2 of them are plastic lenses, which is beneficial to the miniaturization and light weight of the lamp and reduces the production cost.
[0040] More specifically, the image side surface 12 of the first lens 1, the object side surface 21 and the image side surface 22 of the second lens 2, and the object side surface 31 and the image side surface 32 of the third lens 3 are all aspherical structures; and the object side surface 11 of the first lens 1 is a plane and the image side surface 12 is a convex surface; the object side surface 21 of the second lens 2 is a concave surface and the image side surface 22 is a convex surface; the object side surface 31 of the third lens 3 is a concave surface and the image side surface 32 is a convex surface.
[0041] Based on the above situation, in this embodiment, the distance d01 between the object side surface 11 of the first lens 1 and the light source assembly satisfies: d01≥1mm. The refractive index of the first lens 1 is n1, the refractive index of the second lens 2 is n2, and the refractive index of the third lens 3 is n3; then: n1 < n2; n2 > n3. The image side surface 32 of the third lens 3 satisfies the following formula: 9mm < Sa < 15mm; where, Sa is the degree of convexity of the lens surface.
[0042] In addition, the focal length of the first lens 1 is f1, the focal length of the second lens 2 is f2, and the focal length of the third lens 3 is f3; then: 300mm < f2 < 1300mm; 100mm < f3 < 200mm; 0 < f1 / f2 < 0.1. It should also be noted that the light-emitting aperture D1 of the first lens 1 and the central thickness T1 of the first lens 1 satisfy the following relationship: D1 / T1 ≥ 1.3.
[0043] Based on the above structure, the total optical axis length L of the optical lens group satisfies the following relational formula: 60mm ≤ L ≤ 70mm.
[0044] In summary, for the optical lens group of this embodiment, it can focus light more accurately, the overall axial distortion difference is smaller, better image clarity and details can be obtained, and the imaging quality is high. Adopting the optical lens group of the present utility model can better transmit light, reduce the scattering and reflection of light, and improve the light transmission and imaging ability of the optical lens group.
[0045] Embodiment 2:
[0046] Please refer to Figure 1 and Figure 4 as well as Figure 5 As shown, based on the optical lens assembly of Example 1, the approximate parameters of the optical lens assembly provided in this embodiment are as follows:
[0047] Table 1
[0048]
[0049]
[0050] The focal length f1 of the first lens 1 is 22.1 mm, the focal length f2 of the second lens 2 is 426.4 mm, and the focal length f3 of the third lens 3 is 158 mm; the light-emitting aperture D1 of the first lens 1 is 32.6 mm, the center thickness T1 is 25 mm, the distance d01 between the object side surface 11 of the first lens 1 and the light source is 1 mm, and the total length of the lens optical axis is L=66.4; the surface convexity Sa of the image side surface 32 of the third lens 3 is 9.8 mm.
[0051] The image side surface 11 of the first lens 1, the object side surface 21 and the image side surface 22 of the second lens 2, and the object side surface 31 and the image side surface 32 of the third lens 3 are all aspherical lenses. The aspherical expression is as follows:
[0052]
[0053] Among them, c is the paraxial curvature of the aspheric surface, ak is the high-order coefficient, K is the cone coefficient, where K = -e2, and e is the eccentricity of the conic section.
[0054] The aspheric coefficients of the first lens 2, the second lens 2 and the third lens 3 of this embodiment are shown in Table 2:
[0055] Table 2
[0056]
[0057]
[0058] Reference Figure 4 : is a field curvature diagram of the optical lens assembly of this embodiment, in which the abscissa represents the defocus amount in mm, and the ordinate represents the image height in mm.
[0059] Reference Figure 5 3 is a distortion diagram of the optical lens assembly of this embodiment, in which the abscissa represents the distortion value in percentage, and the ordinate represents the image height in mm.
[0060] from Figure 4 and Figure 5It can be seen from the simulation results that the optical lens group of this embodiment has a small overall axial distortion difference, can obtain good image clarity and details, and has high imaging quality. The defocus is small, which helps to reduce image distortion. Reduce distortion phenomena such as image blur, ghosting or deformation. The lens can better transmit light, reduce light scattering and reflection, and improve the lens's ability to transmit and image light.
[0061] Embodiment 3:
[0062] See also Figure 2 and Figure 6 as well as Figure 7 As shown, based on the optical lens assembly of Example 1, the approximate parameters of the optical lens assembly provided in this embodiment are as follows:
[0063] Table 3
[0064]
[0065]
[0066] The focal length f1 of the first lens 1 is 22.127mm, the focal length f2 of the second lens 2 is 1266.53mm, and the focal length f3 of the third lens 3 is 123.5mm; the light-emitting aperture D1 of the first lens 1 is 32.6mm, and the center thickness T1 is 23.9mm; the distance d01 between the object side surface 11 of the first lens 1 and the light source is 1.2mm, and the total length of the lens optical axis is L=60.7; the surface convexity Sa of the image side surface 32 of the third lens 3 is 12.4mm.
[0067] The image side surface 12 of the first lens 1, the object side surface 21 and the image side surface 22 of the second lens 2, and the object side surface 31 and the image side surface 32 of the third lens 3 are all aspherical lenses. The aspherical expression is as follows:
[0068]
[0069] Among them, c is the paraxial curvature of the aspheric surface, ak is the high-order coefficient, K is the cone coefficient, where K = -e2, and e is the eccentricity of the conic section.
[0070] The aspheric coefficients of the first lens 1, the second lens 2 and the third lens 3 of this embodiment are shown in Table 4:
[0071]
[0072] Reference Figure 6 : is a field curvature diagram of the optical lens assembly of this embodiment, in which the abscissa represents the defocus amount in mm, and the ordinate represents the image height in mm.
[0073] Reference Figure 73 is a distortion diagram of the optical lens assembly of this embodiment, in which the abscissa represents the distortion value in percentage, and the ordinate represents the image height in mm.
[0074] from Figure 6 and Figure 7 It can be seen from the simulation results that the optical lens group of this embodiment has a small overall axial distortion difference, can obtain good image clarity and details, and has high imaging quality. The defocus is small, which helps to reduce image distortion. Reduce distortion phenomena such as image blur, ghosting or deformation. The lens can better transmit light, reduce light scattering and reflection, and improve the lens's ability to transmit and image light.
[0075] Embodiment 4:
[0076] See also Figure 3 and Figure 8 as well as Fig. 9 As shown, based on the optical lens assembly of Example 1, the approximate parameters of the optical lens assembly provided in this embodiment are as follows:
[0077] Table 5
[0078]
[0079]
[0080] The focal length f1 of the first lens 1 is 24.19 mm, the focal length f2 of the second lens 2 is 353.8 mm, and the focal length f3 of the third lens 3 is 196.06 mm; the light-emitting aperture D1 of the first lens 1 is 32.6 mm, and the center thickness T1 is 25 mm; the distance d01 between the object side surface 11 of the first lens 1 and the light source assembly is 2.4 mm; the total length of the optical axis of the optical lens group of this embodiment is L=70; the surface convexity Sa of the image side surface 32 of the third lens 3 is 14.54 mm.
[0081] The image side surface 12 of the first lens 1, the object side surface 21 and the image side surface 22 of the second lens 2, and the object side surface 31 and the image side surface 32 of the third lens 3 are all aspherical lenses. The aspherical expression is as follows:
[0082]
[0083] Among them, c is the paraxial curvature of the aspheric surface, ak is the high-order coefficient, K is the cone coefficient, where K = -e2, and e is the eccentricity of the conic section.
[0084] The aspheric coefficients of the first lens 1, the second lens 2 and the third lens 3 of this embodiment are shown in Table 6:
[0085]
[0086]
[0087] Reference Figure 8 : is a field curvature diagram of the optical lens assembly of this embodiment, in which the abscissa represents the defocus amount in mm, and the ordinate represents the image height in mm.
[0088] Reference Fig. 9 3 is a distortion diagram of the optical lens assembly of this embodiment, in which the abscissa represents the distortion value in percentage, and the ordinate represents the image height in mm.
[0089] from Figure 8 and Fig. 9 It can be seen from the simulation results that the optical lens group of this embodiment has a small overall axial distortion difference, can obtain good image clarity and details, and has high imaging quality. The defocus is small, which helps to reduce image distortion. Reduce distortion phenomena such as image blur, ghosting or deformation. The lens can better transmit light, reduce light scattering and reflection, and improve the lens's ability to transmit and image light.
[0090] Embodiment 5:
[0091] Based on the optical lens assembly of Example 1, this embodiment provides a vehicle lamp, including: the optical lens assembly of the embodiment.
[0092] For the industrial camera of this embodiment, only one adjustment component is needed to drive the focal length adjustment gear s2 and the aperture adjustment gear s1, so that the adjustment of the focal length and aperture of the lens are both achieved by one adjustment component, thereby simplifying the structure of the overall lens adjustment device and meeting the adjustment requirements for the focal length and aperture of the lens.
[0093] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
[0094] In the description of the present invention, it is necessary to understand that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0095] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0096] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.
[0097] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0098] In the present utility model, unless otherwise clearly specified and limited, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being above, above, and above the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being below, below, and below the second feature includes the first feature being directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.
Claims
1. An optical lens assembly, characterized in that: Comprising: A first lens, a second lens, and a third lens are sequentially arranged along the optical axis direction from the object side to the image side; The first lens is a glass lens, and the second lens and the third lens are both plastic lenses; The image side surface of the first lens, the object side surface and the image side surface of the second lens, and the object side surface and the image side surface of the third lens are all aspherical surfaces; and The object side surface of the first lens is a plane and the image side surface is a convex surface; the object side surface of the second lens is a concave surface and the image side surface is a convex surface; the object side surface of the third lens is a concave surface and the image side surface is a convex surface.
2. The optical lens assembly according to claim 1, characterized in that: A light source is provided on the object side surface of the first lens.
3. The optical lens assembly according to claim 2, characterized in that: The distance d01 between the object side surface of the first lens and the light source assembly satisfies: d01≥1mm.
4. The optical lens assembly according to claim 1, characterized in that: The refractive index of the first lens is n1, the refractive index of the second lens is n2, and the refractive index of the third lens is n3; then: n1 < n2; n2 > n3.
5. The optical lens assembly according to claim 1, characterized in that: The image side surface of the third lens satisfies the following formula: 9mm < Sa < 15mm; where Sa is the degree of convexity of the lens surface.
6. The optical lens assembly according to claim 1, characterized in that: The focal length of the first lens is f1, the focal length of the second lens is f2, and the focal length of the third lens is f3; then: 300mm < f2 < 1300mm; 100mm < f3 < 200mm; 0 < f1 / f2 < 0.
1.
7. The optical lens assembly according to claim 1, characterized in that: The relationship between the light-emitting aperture D1 of the first lens and the central thickness T1 of the first lens satisfies: D1 / T1 >= 1.
3.
8. The optical lens assembly according to claim 1, characterized in that: The total optical axis length L of the optical lens group satisfies the following relational expression: 60mm≤L≤70mm.
9. The optical lens assembly according to claim 1, characterized in that: The first lens, the second lens, and the third lens are all positive lenses.
10. A vehicle lamp, characterized in that: Comprising: The optical lens group according to any one of claims 1 to 9.